1
|
Tong Z, Gao F, Chen S, Song L, Hu J, Hou Y, Lu J, Leung MKH, Zhan X, Zhang Q. Slippery Porous-Liquid-Infused Porous Surface (SPIPS) with On-Demand Responsive Switching between "Defensive" and "Offensive" Antifouling Modes. Adv Mater 2024; 36:e2308972. [PMID: 37917884 DOI: 10.1002/adma.202308972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/31/2023] [Indexed: 11/04/2023]
Abstract
Slippery liquid-infused porous surfaces (SLIPS) have received widespread attention in the antifouling field. However, the reduction in antifouling performance caused by lubricant loss limits their application in marine antifouling. Herein, inspired by the skin of a poison dart frog which contains venom glands and mucus, a porous liquid (PL) based on ZIF-8 is prepared as a lubricant and injected into a silicone polyurethane (SPU) matrix to construct a new type of SLIPS for marine antifouling applications: the slippery porous-liquid-infused porous surface (SPIPS). The SPIPS consists of a responsive antifoulant-releasing switch between "defensive" and "offensive" antifouling modes to intelligently enhance the antifouling effect after lubricant loss. The SPIPS can adjust antifouling performance to meet the antifouling requirements under different light conditions. The wastage of antifoulants is reduced, thereby effectively maintaining the durability and service life of SLIPS materials. The SPIPS exhibits efficient lubricant self-replenishment, self-cleaning, anti-protein, anti-bacterial, anti-algal, and self-healing (97.48%) properties. Furthermore, it shows satisfactory 360-day antifouling performance in actual marine fields during boom seasons, demonstrating the longest antifouling lifespan in the field tests of reported SLIPS coatings. Hence, the SPIPS can effectively promote the development of SLIPS for neritic antifouling.
Collapse
Affiliation(s)
- Zheming Tong
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Feng Gao
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Sifan Chen
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Lina Song
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Jiankun Hu
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
| | - Yang Hou
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
- Zhejiang Provincial Innovation Center of Advanced Chemicals Technology, Quzhou Research Institute, Zhejiang University, Quzhou, 324000, China
| | - Jianguo Lu
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Michael K H Leung
- School of Energy and Environment, Ability R&D Energy Research Centre, City University of Hong Kong, Hong Kong, 999077, China
| | - Xiaoli Zhan
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
- Zhejiang Provincial Innovation Center of Advanced Chemicals Technology, Quzhou Research Institute, Zhejiang University, Quzhou, 324000, China
| | - Qinghua Zhang
- College of Chemical and Biological Engineering, Zhejiang University, Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, Hangzhou, 310027, China
- Zhejiang Provincial Innovation Center of Advanced Chemicals Technology, Quzhou Research Institute, Zhejiang University, Quzhou, 324000, China
| |
Collapse
|
2
|
Lin H, Li X, Qin X, Cao Y, Ruan Y, Leung MKH, Leung KMY, Lam PKS, He Y. Particle size-dependent and route-specific exposure to liquid crystal monomers in indoor air: Implications for human health risk estimations. Sci Total Environ 2024; 908:168328. [PMID: 37926258 DOI: 10.1016/j.scitotenv.2023.168328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/19/2023] [Accepted: 11/02/2023] [Indexed: 11/07/2023]
Abstract
In indoor environments, liquid crystal monomers (LCMs) released from display devices is a significant concern, necessitating a comprehensive investigation into their distribution behaviors and potential health risks. Herein, we examined various LCMs in educational and workplace air and compared their associated health risks through inhalation and dermal absorption routes. 4-propyl-4'-vinylbicyclohexyl (3VbcH) and 4,4'-bis(4-propylcyclohexyl) biphenyl (b3CHB) with median concentrations of 101 and 1460 pg m-3, were the predominant LCMs in gaseous and particulate phases, respectively. Composition and concentration of LCMs differed substantially between sampling locations due to the discrepancy in the quantity, types, and brands of electronic devices in each location. Three models were further employed to estimate the gas-particle partitioning of LCMs and compared with the measured data. The results indicated that the HB model exhibited the best overall performance, while the LMY model provided a good fit for LCMs with higher log Koa (>12.48). Monte Carlo simulation was used to estimate and compared the probabilistic daily exposure dose and potential health risks. Inhalation exposure of LCMs was significantly greater than the dermal absorption by approximately 1-2 orders of magnitude, implying that it was the primary exposure route of human exposure to airborne LCMs. However, certain LCMs exhibited comparable or higher exposure levels via the dermal absorption route due to the significant overall permeability coefficient. Furthermore, the particle size was discovered to impact the daily exposure dose, contingent on the particle mass-transfer coefficients and accumulation of LCMs on diverse particle sizes. Although the probabilistic non-carcinogenic risks of LCMs were relatively low, their chronic effects on human beings merit further investigations. Overall, this study provides insights into the contamination and potential health risks of LCMs in indoor environments, underscoring the importance of considering particle sizes and all possible exposure pathways in estimating human health risks caused by airborne organic contaminants.
Collapse
Affiliation(s)
- Huiju Lin
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong, China; Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China
| | - Xinxing Li
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong, China
| | - Xian Qin
- State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Hong Kong, China
| | - Yaru Cao
- State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Hong Kong, China
| | - Yuefei Ruan
- Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China; State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Hong Kong, China
| | - Michael K H Leung
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong, China
| | - Kenneth M Y Leung
- Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China; State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Hong Kong, China
| | - Paul K S Lam
- Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China; State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Hong Kong, China; Department of Science, School of Science and Technology, Hong Kong Metropolitan University, Hong Kong, China
| | - Yuhe He
- School of Energy and Environment and State Key Laboratory of Marine Pollution, City University of Hong Kong, Hong Kong, China; Research Centre for the Oceans and Human Health, City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, China.
| |
Collapse
|
3
|
Zhang YZ, Li PH, Ren YN, He Y, Zhang CX, Hu J, Cao XQ, Leung MKH. Metal-Based Electrocatalysts for Selective Electrochemical Nitrogen Reduction to Ammonia. Nanomaterials (Basel) 2023; 13:2580. [PMID: 37764608 PMCID: PMC10535433 DOI: 10.3390/nano13182580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 09/07/2023] [Accepted: 09/13/2023] [Indexed: 09/29/2023]
Abstract
Ammonia (NH3) plays a significant role in the manufacture of fertilizers, nitrogen-containing chemical production, and hydrogen storage. The electrochemical nitrogen reduction reaction (e-NRR) is an attractive prospect for achieving clean and sustainable NH3 production, under mild conditions driven by renewable energy. The sluggish cleavage of N≡N bonds and poor selectivity of e-NRR are the primary challenges for e-NRR, over the competitive hydrogen evolution reaction (HER). The rational design of e-NRR electrocatalysts is of vital significance and should be based on a thorough understanding of the structure-activity relationship and mechanism. Among the various explored e-NRR catalysts, metal-based electrocatalysts have drawn increasing attention due to their remarkable performances. This review highlighted the recent progress and developments in metal-based electrocatalysts for e-NRR. Different kinds of metal-based electrocatalysts used in NH3 synthesis (including noble-metal-based catalysts, non-noble-metal-based catalysts, and metal compound catalysts) were introduced. The theoretical screening and the experimental practice of rational metal-based electrocatalyst design with different strategies were systematically summarized. Additionally, the structure-function relationship to improve the NH3 yield was evaluated. Finally, current challenges and perspectives of this burgeoning area were provided. The objective of this review is to provide a comprehensive understanding of metal-based e-NRR electrocatalysts with a focus on enhancing their efficiency in the future.
Collapse
Affiliation(s)
- Yi-Zhen Zhang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; (Y.-Z.Z.)
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Peng-Hui Li
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; (Y.-Z.Z.)
| | - Yi-Nuo Ren
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; (Y.-Z.Z.)
| | - Yun He
- School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430024, China
| | - Cheng-Xu Zhang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
| | - Jue Hu
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
| | - Xiao-Qiang Cao
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China; (Y.-Z.Z.)
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| |
Collapse
|
4
|
Zhou J, Leung TK, Peng Z, Li X, Chen K, Yuan J, Leung MKH. Balancing Volmer Step by Superhydrophilic Dual-Active Domains for Enhanced Hydrogen Evolution. Small 2023; 19:e2300441. [PMID: 37118851 DOI: 10.1002/smll.202300441] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 03/18/2023] [Indexed: 06/19/2023]
Abstract
The reaction kinetics of hydrogen evolution reaction (HER) is largely determined by balancing the Volmer step in alkaline media. Bifunctionality as a proposed strategy can divide the work of water dissociation and intermediates (OH* and H*) adsorption/desorption. However, sluggish OH* desorption plagues water re-adsorption, which leads to poisoning effects of active sites. Some active sites may even directly act as spectators and do not participate in the reaction. Furthermore, the activity comparison under approximate nanostructure between bifunctional effect and single-exposed active sites is not fully understood. Here, a facile three-step strategy is adopted to successfully grow molybdenum disulfide (MoS2 ) on cobalt-containing nitrogen-doped carbon nanotubes (Co-NCNTs), forming obvious dual active domains. The active sites on domains of Co-NCNTs and MoS2 and the tuned electronic structure at the heterointerface trigger the bifunctional effect to balance the Volmer step and improve the catalytic activity. The HER driven by the bifunctional effect can significantly optimize the Gibbs free energy of water dissociation and hydrogen adsorption, resulting in fast reaction kinetics and superior catalytic performance. As a result, the Co-NCNTs/MoS2 catalyst outperforms other HER electrocatalysts with low overpotential (58 and 84 mV at 10 mA cm-2 in alkaline and neutral conditions, respectively), exceptional stability, and negligible degradation.
Collapse
Affiliation(s)
- Jinsong Zhou
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Tsz Kei Leung
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Zehua Peng
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Xin Li
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Keda Chen
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Jiaxin Yuan
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Michael K H Leung
- State Key Laboratory of Marine Pollution, City University of Hong Kong, Kowloon, Hong Kong, China
| |
Collapse
|
5
|
Peng Z, Xiao X, Song J, Libanori A, Lee C, Chen K, Gao Y, Fang Y, Wang J, Wang Z, Chen J, Leung MKH. Improving Relative Permittivity and Suppressing Dielectric Loss of Triboelectric Layers for High-Performance Wearable Electricity Generation. ACS Nano 2022; 16:20251-20262. [PMID: 36520674 DOI: 10.1021/acsnano.2c05820] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
High relative permittivity and low dielectric loss are two desired parameters of a triboelectric layer to enhance its mechanical-to-electrical energy conversion efficiency in a triboelectric nanogenerator (TENG). However, the elevated permittivity of the triboelectric layer is always accompanied by increasing dielectric loss, limiting further improvement or even reducing the electrical output. Herein, we report a method for improving the relative permittivity and suppressing the dielectric loss of the triboelectric layer via nanoscale design at the particle-polymer interface. When incorporated with 2 wt % Ag@C, the triboelectric-layer-enhanced TENG (TLE-TENG) presents a 2.6-fold increment in relative permittivity and a 302% current enhancement. An instantaneous peak power density of 1.22 W m-2, an excellent pressure sensitivity of 90.95 V kPa-1, and an optimized sheet resistance (∼0.14 Ω/sq) are attributes of this greatly enhanced device. Such improvements bode well for the implementation of these enhancing strategies to help position TLE-TENGs as pervasive and sustainable power sources and active self-powered sensors in the era of the Internet of Things.
Collapse
Affiliation(s)
- Zehua Peng
- Ability R&D Energy Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong 999077, People's Republic of China
| | - Xiao Xiao
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Jianxin Song
- Department of Physics, College of Science, City University of Hong Kong, Hong Kong 999077, People's Republic of China
| | - Alberto Libanori
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Ching Lee
- Institute of Textile and Clothing, The Hong Kong Polytechnic University, Hong Kong, China
| | - Keda Chen
- Ability R&D Energy Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong 999077, People's Republic of China
| | - Yuan Gao
- Institute of Textile and Clothing, The Hong Kong Polytechnic University, Hong Kong, China
| | - Yunsheng Fang
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Juan Wang
- Department of Chemistry, College of Science, City University of Hong Kong, Hong Kong 999077, People's Republic of China
| | - Zuankai Wang
- Department of Mechanical Engineering, College of Engineering, City University of Hong Kong, Hong Kong 999077, People's Republic of China
| | - Jun Chen
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Michael K H Leung
- Ability R&D Energy Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong 999077, People's Republic of China
| |
Collapse
|
6
|
Zhang Y, Wang Y, Xie R, Huang H, Leung MKH, Li J, Leung DYC. Photocatalytic Oxidation for Volatile Organic Compounds Elimination: From Fundamental Research to Practical Applications. Environ Sci Technol 2022; 56:16582-16601. [PMID: 36367480 DOI: 10.1021/acs.est.2c05444] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Photocatalysis is regarded as one of the most promising technologies for indoor volatile organic compounds (VOCs) elimination due to its low cost, safe operation, energy efficiency, and high mineralization efficiency under ambient conditions. However, the practical applications of this technology are limited, despite considerable research efforts in recent decades. Until now, most of the works were carried out in the laboratory and focused on exploring new catalytic materials. Only a few works involved the immobilization of catalysts and the design of reactors for practical applications. Therefore, this review systematically summarizes the research and development on photocatalytic oxidation (PCO) of VOCs, with emphasis on recent catalyst's immobilization and reactor designs in detail. First, different types of photocatalytic materials and the mechanisms for PCO of VOCs are briefly discussed. Then, both the catalyst's immobilization techniques and reactor designs are reviewed in detail. Finally, the existing challenges and future perspectives for PCO of VOCs are proposed. This work aims to provide updated information and research inspirations for the commercialization of this technology in the future.
Collapse
Affiliation(s)
- Yingguang Zhang
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Yifei Wang
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, 518071, China
| | - Ruijie Xie
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Haibao Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China
| | - Michael K H Leung
- School of Energy & Environment, City University of Hong Kong, Hong Kong, China
| | - Jiantao Li
- SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Co., Ltd., Dalian 116045, China
| | - Dennis Y C Leung
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| |
Collapse
|
7
|
Ran L, Li Z, Ran B, Cao J, Zhao Y, Shao T, Song Y, Leung MKH, Sun L, Hou J. Engineering Single-Atom Active Sites on Covalent Organic Frameworks for Boosting CO 2 Photoreduction. J Am Chem Soc 2022; 144:17097-17109. [PMID: 36066387 DOI: 10.1021/jacs.2c06920] [Citation(s) in RCA: 53] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Solar carbon dioxide (CO2) conversion is an emerging solution to meet the challenges of sustainable energy systems and environmental/climate concerns. However, the construction of isolated active sites not only influences catalytic activity but also limits the understanding of the structure-catalyst relationship of CO2 reduction. Herein, we develop a universal synthetic protocol to fabricate different single-atom metal sites (e.g., Fe, Co, Ni, Zn, Cu, Mn, and Ru) anchored on the triazine-based covalent organic framework (SAS/Tr-COF) backbone with the bridging structure of metal-nitrogen-chlorine for high-performance catalytic CO2 reduction. Remarkably, the as-synthesized Fe SAS/Tr-COF as a representative catalyst achieved an impressive CO generation rate as high as 980.3 μmol g-1 h-1 and a selectivity of 96.4%, over approximately 26 times higher than that of the pristine Tr-COF under visible light irradiation. From X-ray absorption fine structure analysis and density functional theory calculations, the superior photocatalytic performance is attributed to the synergic effect of atomically dispersed metal sites and Tr-COF host, decreasing the reaction energy barriers for the formation of *COOH intermediates and promoting CO2 adsorption and activation as well as CO desorption. This work not only affords rational design of state-of-the-art catalysts at the molecular level but also provides in-depth insights for efficient CO2 conversion.
Collapse
Affiliation(s)
- Lei Ran
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China.,Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Hong Kong 999077, P. R. China
| | - Zhuwei Li
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Bei Ran
- Institute of Regulatory Science for Medical Devices, Sichuan University, Chengdu 610064, P. R. China
| | - Jiaqi Cao
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yue Zhao
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Teng Shao
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Yurou Song
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| | - Michael K H Leung
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Hong Kong 999077, P. R. China
| | - Licheng Sun
- Center of Artificial Photosynthesis for Solar Fuels and Department of Chemistry, School of Science, Westlake University, Hangzhou 310024, P. R. China.,Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044 Stockholm, Sweden
| | - Jungang Hou
- State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials Oriented Chemical Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, P. R. China
| |
Collapse
|
8
|
Liu J, Zhou J, Leung MKH. Valence Engineering of Polyvalent Cobalt Encapsulated in a Carbon Nanofiber as an Efficient Trifunctional Electrocatalyst for the Zn-Air Battery and Overall Water Splitting. ACS Appl Mater Interfaces 2022; 14:4399-4408. [PMID: 35014796 DOI: 10.1021/acsami.1c18384] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The rapid development of electrochemical power systems has prompted high demand for nonprecious trifunctional electrocatalysts with superior performance, prolonged stability, and low cost for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). Here, a valence engineering strategy is devised to construct a morphology with polyvalent cobalt encapsulated in nitrogen-doped carbon nanofibers (Co/N-CNFs). The diverse cobalt valence states of the Co/N-CNF catalysts contribute to their excellent catalytic effect and high durability in multiple electrochemical processes. The optimal Co/N-CNF catalyst fabricated exhibits a high half-wave potential of ORR (0.86 V) and low overpotentials of OER (380 mV) and HER (241 mV) at 10 mA cm-2. The Co/N-CNF-based Zn-air battery possesses a high charge-discharge efficiency as well as a good cycle stability (50 h at 10 mA cm-2 and 120 h at 20 mA cm-2), much superior to the Pt/C-based batteries. Furthermore, the Co/N-CNF catalyst could perform efficient overall water splitting.
Collapse
Affiliation(s)
- Jin Liu
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Jinsong Zhou
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Michael K H Leung
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| |
Collapse
|
9
|
Shang S, Xiong W, Yang C, Johannessen B, Liu R, Hsu HY, Gu Q, Leung MKH, Shang J. Atomically Dispersed Iron Metal Site in a Porphyrin-Based Metal-Organic Framework for Photocatalytic Nitrogen Fixation. ACS Nano 2021; 15:9670-9678. [PMID: 34024096 DOI: 10.1021/acsnano.0c10947] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The rational design of photocatalysts for efficient nitrogen (N2) fixation at ambient conditions is important for revolutionizing ammonia production and quite challenging because the great difficulty lies in the adsorption and activation of the inert N2. Inspired by a biological molecule, chlorophyll, featuring a porphyrin structure as the photosensitizer and enzyme nitrogenase featuring an iron (Fe) atom as a favorable binding site for N2via π-backbonding, here we developed a porphyrin-based metal-organic framework (PMOF) with Fe as the active center as an artificial photocatalyst for N2 reduction reaction (NRR) under ambient conditions. The PMOF features aluminum (Al) as metal node imparting high stability and Fe incorporated and atomically dispersed by residing at each porphyrin ring promoting the adsorption and the activation of N2, termed Al-PMOF(Fe). Compared with the pristine Al-PMOF, Al-PMOF(Fe) exhibits a substantial enhancement in NH3 yield (635 μg g-1cat.) and production rate (127 μg h-1 g-1cat.) of 82% and 50%, respectively, on par with the best-performing MOF-based NRR catalysts. Three cycles of photocatalytic NRR experimental results corroborate a stable photocatalytic activity of Al-PMOF(Fe). The combined experimental and theoretical results reveal that the Fe-N site in Al-PMOF(Fe) is the active photocatalytic center that can mitigate the difficulty of the rate-determining step in photocatalytic NRR. The possible reaction pathways of NRR on Al-PMOF(Fe) were established. Our study of porphyrin-based MOF for the photocatalytic NRR will provide insight into the rational design of catalysts for artificial photosynthesis.
Collapse
Affiliation(s)
- Shanshan Shang
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
- City University of Hong Kong Shenzhen Research Institute, 8 Yuexing first Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen 518057, People's Republic of China
| | - Wei Xiong
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Sciences and Technology, Dalian University of Technology, Dalian 116024, People's Republic of China
| | - Chao Yang
- Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, People's Republic of China
| | - Bernt Johannessen
- Australian Synchrotron (ANSTO), 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Rugeng Liu
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
- City University of Hong Kong Shenzhen Research Institute, 8 Yuexing first Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen 518057, People's Republic of China
| | - Hsien-Yi Hsu
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
- City University of Hong Kong Shenzhen Research Institute, 8 Yuexing first Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen 518057, People's Republic of China
| | - Qinfen Gu
- Australian Synchrotron (ANSTO), 800 Blackburn Road, Clayton, Victoria 3168, Australia
| | - Michael K H Leung
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
| | - Jin Shang
- School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China
- City University of Hong Kong Shenzhen Research Institute, 8 Yuexing first Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen 518057, People's Republic of China
| |
Collapse
|
10
|
She Y, Wang A, Liu J, Zhou J, Li L, Wang H, Leung MKH. Hierarchical Carbon Nanocages Embedding High‐loading Sulfur for Catalyzing Oxygen Reduction Reactions. ChemCatChem 2021. [DOI: 10.1002/cctc.202001515] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Yiyi She
- Ability R&D Energy Research Centre School of Energy and Environment City University of Hong Kong Hong Kong P.R. China
| | - An Wang
- Center of Nanomaterials for Renewable Energy (CNRE) State Key Lab of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 P.R. China
| | - Jin Liu
- Ability R&D Energy Research Centre School of Energy and Environment City University of Hong Kong Hong Kong P.R. China
| | - Jinsong Zhou
- Ability R&D Energy Research Centre School of Energy and Environment City University of Hong Kong Hong Kong P.R. China
| | - Li Li
- School of Automotive and Traffic Engineering Jiangsu University of Technology Changzhou 213001 P.R. China
| | - Hongkang Wang
- Center of Nanomaterials for Renewable Energy (CNRE) State Key Lab of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an Jiaotong University Xi'an 710049 P.R. China
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre School of Energy and Environment City University of Hong Kong Hong Kong P.R. China
| |
Collapse
|
11
|
Zhu Y, Tso CY, Ho TC, Leung MKH, Yao S. Coalescence-Induced Jumping Droplets on Nanostructured Biphilic Surfaces with Contact Electrification Effects. ACS Appl Mater Interfaces 2021; 13:11470-11479. [PMID: 33630565 DOI: 10.1021/acsami.0c22055] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Benefitting from the coalescence-induced droplet jumping on superhydrophobic surfaces, the condensing droplets on heat exchangers can be removed efficiently, significantly improving the condensation heat-transfer performance of various thermal applications. However, the enhancement of droplet jumping height and self-removal to further improve the condensation heat-transfer performance of the thermal applications remains a challenge due to considerable interfacial adhesion caused by the inevitable partial-Wenzel state condensing droplets on superhydrophobic surfaces. In this study, a biphilic nanostructure is developed to effectively improve the droplet jumping height by decreasing the interfacial adhesion with the formation of Cassie-like droplets. Under atmospheric conditions, ∼28% improvement of droplet jumping height is achieved on a biphilic surface compared to that of a superhydrophobic surface. Additionally, the droplet contact electrification on biphilic surfaces discovered in this work allows the droplets to jump ∼137% higher compared with that under atmospheric conditions. Furthermore, the droplet jumping and electrification mechanisms on the biphilic surface are revealed by building a theoretical model that can predict the experimental results well. Apart from being a milestone for the droplet jumping physics development on biphilic nanostructures, this work also provides new insights into the micro-droplet discipline.
Collapse
Affiliation(s)
- Yihao Zhu
- School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Kowloon 999077, Hong Kong
| | - Chi Yan Tso
- School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Kowloon 999077, Hong Kong
| | - Tsz Chung Ho
- School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Kowloon 999077, Hong Kong
| | - Michael K H Leung
- School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Kowloon 999077, Hong Kong
| | - Shuhuai Yao
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong
| |
Collapse
|
12
|
Wang X, Wang Y, Sang X, Zheng W, Zhang S, Shuai L, Yang B, Li Z, Chen J, Lei L, Adli NM, Leung MKH, Qiu M, Wu G, Hou Y. Dynamic Activation of Adsorbed Intermediates via Axial Traction for the Promoted Electrochemical CO 2 Reduction. Angew Chem Int Ed Engl 2021; 60:4192-4198. [PMID: 33197100 DOI: 10.1002/anie.202013427] [Citation(s) in RCA: 84] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Indexed: 12/26/2022]
Abstract
Regulating the local environment and structure of metal center coordinated by nitrogen ligands (M-N4 ) to accelerate overall reaction dynamics of the electrochemical CO2 reduction reaction (CO2 RR) has attracted extensive attention. Herein, we develop an axial traction strategy to optimize the electronic structure of the M-N4 moiety and construct atomically dispersed nickel sites coordinated with four nitrogen atoms and one axial oxygen atom, which are embedded within the carbon matrix (Ni-N4 -O/C). The Ni-N4 -O/C electrocatalyst exhibited excellent CO2 RR performance with a maximum CO Faradic efficiency (FE) close to 100 % at -0.9 V. The CO FE could be maintained above 90 % in a wide range of potential window from -0.5 to -1.1 V. The superior CO2 RR activity is due to the Ni-N4 -O active moiety composed of a Ni-N4 site with an additional oxygen atom that induces an axial traction effect.
Collapse
Affiliation(s)
- Xinyue Wang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yu Wang
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Xiahan Sang
- Nanostructure Research Center, Wuhan University of Technology, Wuhan, 430070, China
| | - Wanzhen Zheng
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Shihan Zhang
- College of Environment, Zhejiang University of Technology, Hangzhou, 310027, China
| | - Ling Shuai
- Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, China
| | - Bin Yang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.,Institute of Zhejiang University-Quzhou, Quzhou, 324000, China
| | - Zhongjian Li
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.,Institute of Zhejiang University-Quzhou, Quzhou, 324000, China
| | - Jianmeng Chen
- College of Environment, Zhejiang University of Technology, Hangzhou, 310027, China
| | - Lecheng Lei
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.,Institute of Zhejiang University-Quzhou, Quzhou, 324000, China
| | - Nadia Mohd Adli
- Department of Chemical and Biological Engineering, University at Buffalo, the State University of New York, Buffalo, NY, 14260, USA
| | - Michael K H Leung
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Ming Qiu
- Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, China
| | - Gang Wu
- Department of Chemical and Biological Engineering, University at Buffalo, the State University of New York, Buffalo, NY, 14260, USA
| | - Yang Hou
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.,Institute of Zhejiang University-Quzhou, Quzhou, 324000, China
| |
Collapse
|
13
|
Wang X, Wang Y, Sang X, Zheng W, Zhang S, Shuai L, Yang B, Li Z, Chen J, Lei L, Adli NM, Leung MKH, Qiu M, Wu G, Hou Y. Dynamic Activation of Adsorbed Intermediates via Axial Traction for the Promoted Electrochemical CO
2
Reduction. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202013427] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Xinyue Wang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China
| | - Yu Wang
- Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China
| | - Xiahan Sang
- Nanostructure Research Center Wuhan University of Technology Wuhan 430070 China
| | - Wanzhen Zheng
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China
| | - Shihan Zhang
- College of Environment Zhejiang University of Technology Hangzhou 310027 China
| | - Ling Shuai
- Institute of Nanoscience and Nanotechnology College of Physical Science and Technology Central China Normal University Wuhan 430079 China
| | - Bin Yang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China
- Institute of Zhejiang University—Quzhou Quzhou 324000 China
| | - Zhongjian Li
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China
- Institute of Zhejiang University—Quzhou Quzhou 324000 China
| | - Jianmeng Chen
- College of Environment Zhejiang University of Technology Hangzhou 310027 China
| | - Lecheng Lei
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China
- Institute of Zhejiang University—Quzhou Quzhou 324000 China
| | - Nadia Mohd Adli
- Department of Chemical and Biological Engineering University at Buffalo the State University of New York Buffalo NY 14260 USA
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre School of Energy and Environment City University of Hong Kong Hong Kong China
| | - Ming Qiu
- Institute of Nanoscience and Nanotechnology College of Physical Science and Technology Central China Normal University Wuhan 430079 China
| | - Gang Wu
- Department of Chemical and Biological Engineering University at Buffalo the State University of New York Buffalo NY 14260 USA
| | - Yang Hou
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China
- Institute of Zhejiang University—Quzhou Quzhou 324000 China
| |
Collapse
|
14
|
Hu J, Zhang C, Zhang Y, Yang B, Qi Q, Sun M, Zi F, Leung MKH, Huang B. Interface Modulation of MoS 2 /Metal Oxide Heterostructures for Efficient Hydrogen Evolution Electrocatalysis. Small 2020; 16:e2002212. [PMID: 32510832 DOI: 10.1002/smll.202002212] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 05/03/2020] [Indexed: 06/11/2023]
Abstract
Developing efficient earth-abundant MoS2 based hydrogen evolution reaction (HER) electrocatalysts is important but challenging due to the sluggish kinetics in alkaline media. Herein, a strategy to fabricate a high-performance MoS2 based HER electrocatalyst by modulating interface electronic structure via metal oxides is developed. All the heterostructure catalysts present significant improvement of HER electrocatalytic activities, demonstrating a positive role of metal oxides decoration in promoting the rate-limited water dissociation step for the HER mechanism in alkaline media. The as-obtained MoS2 /Ni2 O3 H catalyst exhibits a low overpotential of 84 mV at 10 mA cm-2 and small charge-transfer resistance of 1.5 Ω in 1 m KOH solution. The current density (217 mA cm-2 ) at the overpotential of 200 mV is about 2 and 24 times higher than that of commercial Pt/C and bare MoS2 , respectively. Additionally, these MoS2 /metal oxides heterostructure catalysts show outstanding long-term stability under a harsh chronopotentiometry test. Theoretical calculations reveal the varied sensitivity of 3d-band in different transition oxides, in which Ni-3d of Ni2 O3 H is evidently activated to achieve fast electron transfer for HER as the electron-depletion center. Both electronic properties and energetic reaction trends confirm the high electroactivity of MoS2 /Ni2 O3 H in the adsorption and dissociation of H2 O for highly efficient HER in alkaline media.
Collapse
Affiliation(s)
- Jue Hu
- Faculty of Science, Kunming University of Science and Technology, Kunming, 650093, China
| | - Chengxu Zhang
- Faculty of Science, Kunming University of Science and Technology, Kunming, 650093, China
| | - Yizhen Zhang
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, 999077, China
| | - Baomin Yang
- Faculty of Science, Kunming University of Science and Technology, Kunming, 650093, China
| | - Qianglong Qi
- Faculty of Science, Kunming University of Science and Technology, Kunming, 650093, China
| | - Mingzi Sun
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, 999077, China
| | - Futing Zi
- Faculty of Science, Kunming University of Science and Technology, Kunming, 650093, China
| | - Michael K H Leung
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, 999077, China
- Research Centre for the Oceans and Human Health, The City University of Hong Kong Shenzhen Research Institute, Shenzhen, Guangdong, 518000, China
| | - Bolong Huang
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, 999077, China
| |
Collapse
|
15
|
Xia Y, Shuai L, Wang Y, Ma Y, Han L, Qiu M, Zhang Z, Leung MKH. Designing bifuncitonal molecular devices with a metalloporphyrin dimer. Phys Chem Chem Phys 2020; 22:4080-4085. [PMID: 32031181 DOI: 10.1039/c9cp05079e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Many organic molecules have unique magnetic properties and can potentially serve as excellent molecular spin devices, which is worth exploring deeply. Here, the spin transport properties of Mn, Fe, Co and Cu porphyrin dimer devices are investigated based on the first principles method. The spin filtering efficiencies of these molecular devices are maintained at 100% within certain applied voltage ranges and magnetoresistance ratios are higher than 108% which increase as the voltage increases. To explain the excellent spin-filtering and giant magnetoresistance effects, analysis of spin electron densities and transmission spectra indicates that magnetic properties are mainly contributed by the metal atoms and their neighbouring N atoms. From the transmission pathway studies, spin electrons come mainly through the π-conjugated structure of the metal porphyrin ring. Interestingly, in the Cu porphyrin dimer device, magnetic moments of the Cu-N structure in the Cu porphyrin dimer device show spin behaviors different from those of Mn, Fe and Co porphyrin dimer devices.
Collapse
Affiliation(s)
- Ying Xia
- Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China.
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Yuan K, Lützenkirchen-Hecht D, Li L, Shuai L, Li Y, Cao R, Qiu M, Zhuang X, Leung MKH, Chen Y, Scherf U. Boosting Oxygen Reduction of Single Iron Active Sites via Geometric and Electronic Engineering: Nitrogen and Phosphorus Dual Coordination. J Am Chem Soc 2020; 142:2404-2412. [DOI: 10.1021/jacs.9b11852] [Citation(s) in RCA: 381] [Impact Index Per Article: 95.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Kai Yuan
- College of Chemistry/Institute of Polymers and Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
- Macromolecular Chemistry Group (buwmakro) and Institute for Polymer Technology, Bergische Universität Wuppertal, Gauss-Strasse 20, D-42119 Wuppertal, Germany
| | - Dirk Lützenkirchen-Hecht
- Faculty of Mathematics and Natural Sciences-Physics Department and Institute for Polymer Technology, Bergische Universität Wuppertal, Gauss-Strasse 20, D-42119 Wuppertal, Germany
| | - Longbin Li
- College of Chemistry/Institute of Polymers and Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
| | - Ling Shuai
- Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, 430079 Wuhan, China
| | - Yizhe Li
- College of Chemistry/Institute of Polymers and Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
| | - Rui Cao
- Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Ming Qiu
- Institute of Nanoscience and Nanotechnology, College of Physical Science and Technology, Central China Normal University, 430079 Wuhan, China
| | - Xiaodong Zhuang
- Meso-Entropy Matter Lab, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, State Key Laboratory of Metal Matrix Composites, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240 Shanghai, China
| | - Michael K. H. Leung
- Institution Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Yiwang Chen
- College of Chemistry/Institute of Polymers and Energy Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China
| | - Ullrich Scherf
- Macromolecular Chemistry Group (buwmakro) and Institute for Polymer Technology, Bergische Universität Wuppertal, Gauss-Strasse 20, D-42119 Wuppertal, Germany
| |
Collapse
|
17
|
Xiong W, Yang J, Shuai L, Hou Y, Qiu M, Li X, Leung MKH. Cover Feature: CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO
2
Reduction (ChemElectroChem 24/2019). ChemElectroChem 2019. [DOI: 10.1002/celc.201901881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Wei Xiong
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Sciences and TechnologyDalian University of Technology Dalian 116024 P.R. China
- Ability R&D Energy Research Centre, School of Energy and EnvironmentCity University of Hong Kong Kowloon Hong Kong P.R. China
| | - Jian Yang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological EngineeringZhejiang University 310027 Hangzhou P.R. China
| | - Ling Shuai
- Institute of Nanoscience and Nanotechnology, College of Physical Science and TechnologyCentral China Normal University Wuhan 430079 P.R. China
| | - Yang Hou
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological EngineeringZhejiang University 310027 Hangzhou P.R. China
| | - Ming Qiu
- Institute of Nanoscience and Nanotechnology, College of Physical Science and TechnologyCentral China Normal University Wuhan 430079 P.R. China
| | - Xinyong Li
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Sciences and TechnologyDalian University of Technology Dalian 116024 P.R. China
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre, School of Energy and EnvironmentCity University of Hong Kong Kowloon Hong Kong P.R. China
| |
Collapse
|
18
|
Xiong W, Yang J, Shuai L, Hou Y, Qiu M, Li X, Leung MKH. CuSn Alloy Nanoparticles on Nitrogen‐Doped Graphene for Electrocatalytic CO
2
Reduction. ChemElectroChem 2019. [DOI: 10.1002/celc.201901381] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Wei Xiong
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Sciences and TechnologyDalian University of Technology Dalian 116024 P.R. China
- Ability R&D Energy Research Centre, School of Energy and EnvironmentCity University of Hong Kong Kowloon Hong Kong P.R. China
| | - Jian Yang
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological EngineeringZhejiang University 310027 Hangzhou P.R. China
| | - Ling Shuai
- Institute of Nanoscience and Nanotechnology, College of Physical Science and TechnologyCentral China Normal University Wuhan 430079 P.R. China
| | - Yang Hou
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological EngineeringZhejiang University 310027 Hangzhou P.R. China
| | - Ming Qiu
- Institute of Nanoscience and Nanotechnology, College of Physical Science and TechnologyCentral China Normal University Wuhan 430079 P.R. China
| | - Xinyong Li
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Sciences and TechnologyDalian University of Technology Dalian 116024 P.R. China
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre, School of Energy and EnvironmentCity University of Hong Kong Kowloon Hong Kong P.R. China
| |
Collapse
|
19
|
Wang P, Xie S, She Y, Fan W, Leung MKH, Wang H. Microwave-Hydrothermal Synthesis of Hierarchical Sb2
WO6
Nanostructures as a New Anode Material for Sodium Storage. ChemistrySelect 2019. [DOI: 10.1002/slct.201803284] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ping Wang
- State Key Lab of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering; Xi'an Jiaotong University; Xi'an 710049 People's Republic of China
| | - Sanmu Xie
- State Key Lab of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering; Xi'an Jiaotong University; Xi'an 710049 People's Republic of China
| | - YiYi She
- Ability R&D Energy Research Centre (AERC), School of Energy and Environment; City University of Hong Kong; Hong Kong SAR People's Republic of China
| | - Wenguang Fan
- Ability R&D Energy Research Centre (AERC), School of Energy and Environment; City University of Hong Kong; Hong Kong SAR People's Republic of China
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre (AERC), School of Energy and Environment; City University of Hong Kong; Hong Kong SAR People's Republic of China
| | - Hongkang Wang
- State Key Lab of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy (CNRE), School of Electrical Engineering; Xi'an Jiaotong University; Xi'an 710049 People's Republic of China
| |
Collapse
|
20
|
Karthikeyan R, Krishnaraj N, Selvam A, Wong JWC, Lee PKH, Leung MKH, Berchmans S. Effect of composites based nickel foam anode in microbial fuel cell using Acetobacter aceti and Gluconobacter roseus as a biocatalysts. Bioresour Technol 2016; 217:113-120. [PMID: 26970695 DOI: 10.1016/j.biortech.2016.02.114] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2015] [Revised: 02/24/2016] [Accepted: 02/25/2016] [Indexed: 06/05/2023]
Abstract
This study explores the use of materials such as chitosan (chit), polyaniline (PANI) and titanium carbide (TC) as anode materials for microbial fuel cells. Nickel foam (NF) was used as the base anode substrate. Four different types of anodes (NF, NF/PANI, NF/PANI/TC, NF/PANI/TC/Chit) are thus prepared and used in batch type microbial fuel cells operated with a mixed consortium of Acetobacter aceti and Gluconobacter roseus as the biocatalysts and bad wine as a feedstock. A maximum power density of 18.8Wm(-3) (≈2.3 times higher than NF) was obtained in the case of the anode modified with a composite of PANI/TC/Chit. The MFCs running under a constant external resistance of (50Ω) yielded 14.7% coulombic efficiency with a maximum chemical oxygen demand (COD) removal of 87-93%. The overall results suggest that the catalytic materials embedded in the chitosan matrix show the best performance and have potentials for further development.
Collapse
Affiliation(s)
- Rengasamy Karthikeyan
- Electrodics and Electrocatalysis (EEC) Division, Central Electrochemical Research Institute (CSIR-CECRI), Karaikudi 630 006, Tamil Nadu, India; Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China; Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Hong Kong, Hong Kong, China.
| | - Navanietha Krishnaraj
- Electrodics and Electrocatalysis (EEC) Division, Central Electrochemical Research Institute (CSIR-CECRI), Karaikudi 630 006, Tamil Nadu, India
| | - Ammaiyappan Selvam
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Hong Kong, Hong Kong, China
| | - Jonathan Woon-Chung Wong
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Hong Kong, Hong Kong, China
| | - Patrick K H Lee
- Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Michael K H Leung
- Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Sheela Berchmans
- Electrodics and Electrocatalysis (EEC) Division, Central Electrochemical Research Institute (CSIR-CECRI), Karaikudi 630 006, Tamil Nadu, India
| |
Collapse
|
21
|
Fan W, Leung MKH. Recent Development of Plasmonic Resonance-Based Photocatalysis and Photovoltaics for Solar Utilization. Molecules 2016; 21:E180. [PMID: 26848648 PMCID: PMC6274351 DOI: 10.3390/molecules21020180] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 01/24/2016] [Accepted: 01/27/2016] [Indexed: 12/20/2022] Open
Abstract
Increasing utilization of solar energy is an effective strategy to tackle our energy and energy-related environmental issues. Both solar photocatalysis (PC) and solar photovoltaics (PV) have high potential to develop technologies of many practical applications. Substantial research efforts are devoted to enhancing visible light activation of the photoelectrocatalytic reactions by various modifications of nanostructured semiconductors. This review paper emphasizes the recent advancement in material modifications by means of the promising localized surface plasmonic resonance (LSPR) mechanisms. The principles of LSPR and its effects on the photonic efficiency of PV and PC are discussed here. Many research findings reveal the promise of Au and Ag plasmonic nanoparticles (NPs). Continual investigation for increasing the stability of the plasmonic NPs will be fruitful.
Collapse
Affiliation(s)
- Wenguang Fan
- Ability R & D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Hong Kong, China.
| | - Michael K H Leung
- Ability R & D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Kowloon Tong, Hong Kong, China.
| |
Collapse
|
22
|
She Y, Lu Z, Ni M, Li L, Leung MKH. Facile synthesis of nitrogen and sulfur codoped carbon from ionic liquid as metal-free catalyst for oxygen reduction reaction. ACS Appl Mater Interfaces 2015; 7:7214-21. [PMID: 25781628 DOI: 10.1021/acsami.5b00222] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Developing metal-free catalysts for oxygen reduction reaction (ORR) is a great challenge in the development of fuel cells. Nitrogen and sulfur codoped carbon with remarkably high nitrogen content up to 13.00 at % was successfully fabricated by pyrolysis of homogeneous mixture of exfoliated graphitic flakes and ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([Bimi][Tf2N]). The exfoliated graphite flakes served as a structure-directing substance as well as additional carbon source in the fabrication. It was demonstrated that the use of graphite flakes increased the nitrogen doping level, optimized the composition of active nitrogen configurations, and enlarged the specific surface area of the catalysts. Electrochemical characterizations revealed that the N and S codoped carbon fabricated by this method exhibited superior catalytic activities toward ORR under both acidic and alkaline conditions. Particularly in alkaline solution, the current catalyst compared favorably to the conventional 20 wt % Pt/C catalyst via four-electron transfer pathway with better ORR selectivity. The excellent catalytic activity was mainly ascribed to high nitrogen doping content, appropriate constitution of active nitrogen configurations, large specific surface area, and synergistic effect of N and S codoping.
Collapse
Affiliation(s)
| | - Zhouguang Lu
- ‡Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen, Guangdong, China
| | - Meng Ni
- §Department of Building and Real Estate, The Hong Kong Polytechnic University, ZN713, South Tower, 7/F , Block Z, Hong Kong, China
| | | | | |
Collapse
|
23
|
Wang H, Luo X, Leung MKH, Leung DYC, Tang Z, Wang H, Luque R, Xuan J. In situ photogalvanic acceleration of optofluidic kinetics: a new paradigm for advanced photocatalytic technologies. RSC Adv 2015. [DOI: 10.1039/c4ra14032j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A multiscale-designed optofluidic reactor is demonstrated, featuring an overall reaction rate constant of 1.32 s−1 for photocatalytic decolourization of methylene blue, which is an order of magnitude higher as compared to literature records.
Collapse
Affiliation(s)
- Huizhi Wang
- School of Engineering and Physical Sciences
- Heriot-Watt University
- Edinburgh
- UK
| | - Xiaojiao Luo
- Department of Mechanical Engineering
- The University of Hong Kong
- Pok Fu Lam
- Hong Kong
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre
- School of Energy and Environment
- City University of Hong Kong
- Kowloon
- Hong Kong
| | - Dennis Y. C. Leung
- Department of Mechanical Engineering
- The University of Hong Kong
- Pok Fu Lam
- Hong Kong
| | - Zhiyong Tang
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering
- Shanghai Advanced Research Institute
- Chinese Academy of Sciences
- Shanghai 201210
- China
| | | | - Rafael Luque
- Departamento de Química Orgánica
- Universidad de Córdoba
- Edif. Marie Curie
- E14014 Córdoba
- Spain
| | - Jin Xuan
- School of Engineering and Physical Sciences
- Heriot-Watt University
- Edinburgh
- UK
| |
Collapse
|
24
|
Fan W, Jewell S, She Y, Leung MKH. In situ deposition of Ag-Ag2S hybrid nanoparticles onto TiO2 nanotube arrays towards fabrication of photoelectrodes with high visible light photoelectrochemical properties. Phys Chem Chem Phys 2014; 16:676-80. [PMID: 24270769 DOI: 10.1039/c3cp54098g] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ag-Ag2S hybrid nanoparticles were deposited onto Anatase anodic TiO2 nanotubular arrays via a one-step in situ hydrothermal method. Characterization was carried out using FE-SEM, HRTEM, XRD, XPS and UV-vis DRS. The fabricated nano-composites exhibit high visible light-sensitivity and photocurrent output as photoanodes in photoelectrochemical applications. The outstanding performance of the final composite is attributed to the surface plasmonic resonance effect of Ag, which is further enhanced by an Ag2S outer-layer.
Collapse
Affiliation(s)
- Wenguang Fan
- Ability R&D Energy Research Centre, School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong S.A.R, P.R. China.
| | | | | | | |
Collapse
|
25
|
Wang H, Xi L, Tucek J, Ma C, Yang G, Leung MKH, Zboril R, Niu C, Rogach AL. Synthesis and Characterization of Tin Titanate Nanotubes: Precursors for Nanoparticulate Sn-Doped TiO2Anodes with Synergistically Improved Electrochemical Performance. ChemElectroChem 2014. [DOI: 10.1002/celc.201402188] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
26
|
|
27
|
Wang J, Cao F, Bian Z, Leung MKH, Li H. Ultrafine single-crystal TiOF2 nanocubes with mesoporous structure, high activity and durability in visible light driven photocatalysis. Nanoscale 2014; 6:897-902. [PMID: 24270402 DOI: 10.1039/c3nr04489k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Single crystal TiOF2 nanocubes assembled into a mesoporous structure were synthesized by alcoholysis of TiF4 under solvothermal conditions, which displayed spectral response in the visible area owing to the intrinsic narrow energy band gap. Mechanism studies revealed that TiOF2 was formed via consecutive hydrolysis reactions and the H2O produced by condensation between two alcohols played a key role in determining the TiOF2 crystal growth and its transformation to anatase TiO2. The TiOF2 nanocube size could be easily adjusted by changing either alcoholysis time, or solvothermal temperature, or alcohol kind owing to the different H2O production rate and amount. The small-sized TiOF2 nanocubes with large surface area exhibited high activity in photocatalytic degradation of Rhodamine B (RhB) and 4-chlorophenol (4-CP) owing to the enhanced adsorption for reactant molecules and the reduced photoelectron-hole recombination rate. Meanwhile, they also showed strong durability since the mesoporous structure enhanced the stability against either the phase transformation from TiOF2 crystal to anatase TiO2 or the agglomeration of TiOF2 nanocubes.
Collapse
Affiliation(s)
- Jinguo Wang
- The Education Ministry Key Lab of Resource Chemistry, Department of Chemistry, Shanghai University of Electric Power, Shanghai 200090, P. R. China.
| | | | | | | | | |
Collapse
|
28
|
Wang H, Wang M, Li B, Yang X, Safarova K, Zboril R, Rogach AL, Leung MKH. Hydrothermal synthesis and electrochemical properties of tin titanate nanowires coupled with SnO2 nanoparticles for Li-ion batteries. CrystEngComm 2014. [DOI: 10.1039/c4ce00682h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Tin-titanate nanowires coupled with SnO2 nanoparticles demonstrate enhanced electrochemical properties owing to atomic- and nano-scaled uniform distribution of tin elements.
Collapse
Affiliation(s)
- Hongkang Wang
- Ability R&D Energy Research Centre (AERC)
- School of Energy and Environment
- City University of Hong Kong
- Hong Kong SAR
- Center of Nanomaterials for Renewable Energy (CNRE)
| | - Man Wang
- Department of Physics and Materials Science
- City University of Hong Kong
- Hong Kong SAR
| | - Beibei Li
- Center of Nanomaterials for Renewable Energy (CNRE)
- State Key Lab of Electrical Insulation and Power Equipment
- School of Electrical Engineering
- Xi'an Jiaotong University
- Xi'an, China
| | - Xia Yang
- Department of Physics and Materials Science
- City University of Hong Kong
- Hong Kong SAR
| | - Klara Safarova
- Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Department of Physical Chemistry
- Palacky University in Olomouc
- Olomouc, Czech Republic
| | - Radek Zboril
- Regional Centre of Advanced Technologies and Materials
- Faculty of Science
- Department of Physical Chemistry
- Palacky University in Olomouc
- Olomouc, Czech Republic
| | - Andrey L. Rogach
- Department of Physics and Materials Science
- City University of Hong Kong
- Hong Kong SAR
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre (AERC)
- School of Energy and Environment
- City University of Hong Kong
- Hong Kong SAR
| |
Collapse
|
29
|
Abstract
A dual-electrolyte aluminum/air electrochemical cell with a high anodic capacity of 6000 mA h cm−3.
Collapse
Affiliation(s)
- Lei Wang
- Department of Mechanical Engineering
- The University of Hong Kong
- Hong Kong, China
| | - Fude Liu
- Department of Mechanical Engineering
- The University of Hong Kong
- Hong Kong, China
| | - Wentao Wang
- Department of Mechanical Engineering
- The University of Hong Kong
- Hong Kong, China
| | - Guandong Yang
- Department of Mechanical Engineering
- The University of Hong Kong
- Hong Kong, China
| | - Dawei Zheng
- Department of Mechanical Engineering
- The University of Hong Kong
- Hong Kong, China
| | - Zhuangchun Wu
- School of Materials Science and Engineering
- Nanjing University of Science and Technology
- Nanjing 210094, China
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre
- School of Energy and Environment
- City University of Hong Kong
- Hong Kong, China
| |
Collapse
|
30
|
Wang B, Lu XY, Yu LK, Xuan J, Leung MKH, Guo H. Facile synthesis of TiO2 hollow spheres composed of high percentage of reactive facets for enhanced photocatalytic activity. CrystEngComm 2014. [DOI: 10.1039/c4ce00826j] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In this study, facile synthesis of hollow TiO2 spheres composed of a high percentage of reactive facets (~85%) is successfully prepared with TiOSO4 and HBF4 by the hydrothermal method.
Collapse
Affiliation(s)
- Bin Wang
- Ability R&D Energy Research Centre
- School of Energy and Environment
- City University of Hong Kong
- Hong Kong, China
- Green Energy
| | - Xiao-Ying Lu
- Faculty of Science and Technology
- Technological and Higher Education Institute of Hong Kong
- Hong Kong, China
| | - Lawrence K. Yu
- Green Energy
- Sensing & Integration Group
- Hong Kong Applied Science and Technology Research Institute Company Limited
- Hong Kong, China
- Department of Chemical and Biological Engineering
| | - Jin Xuan
- Institute of Mechanical, Process and Energy Engineering
- School of Engineering & Physical Sciences
- Heriot-Watt University
- Edinburgh EH14 4AS, UK
| | - Michael K. H. Leung
- Ability R&D Energy Research Centre
- School of Energy and Environment
- City University of Hong Kong
- Hong Kong, China
| | - Hongfan Guo
- College of Chemical Engineering
- Shenyang University of Chemical Technology
- Shenyang, China
| |
Collapse
|
31
|
Wang B, Karthikeyan R, Lu XY, Xuan J, Leung MKH. High photocatalytic activity of immobilized TiO2 nanorods on carbonized cotton fibers. J Hazard Mater 2013; 263 Pt 2:659-669. [PMID: 24220193 DOI: 10.1016/j.jhazmat.2013.10.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 10/09/2013] [Accepted: 10/15/2013] [Indexed: 06/02/2023]
Abstract
In this study, TiO2 nanorods were successfully immobilized on carbon fibers by a facile pyrolysis of natural cotton in nitrogen atmosphere followed by a one-pot hydrothermal method. Carbonized cotton fibers (CCFs) and TiO2-CCFs composites were characterized using field-emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, X-ray diffractometer (XRD), diffuse reflectance UV-vis spectroscopy (DRS) and photoluminescence (PL) spectroscopy. Results implied that the band gap narrowing of TiO2 was achieved after integration of CCFs. Dye adsorption isotherm indicated that the maximum dye adsorption capacity (qm) of CCFs-1000 (13.4 mg/g) was 2 times higher than that of cotton fibers and qm of TiO2-CCFs-1000 (9.0mg/g) was 6-7 times higher than that of TiO2 nanorods. Photocatalytic activity of TiO2 nanorods prepared with 3 mL Ti(OBu)4 showed the highest photocatalytic activity. TiO2-CCFs-1000 exhibited higher activity than TiO2 immobilized on CCFs-400, CCFs-600 and CCFs-800. Good photostability of TiO2-CCFs-1000 was found for dye degradation under visible light irradiation. The enhancement of photocatalytic dye degradation was due to the high adsorptivity of dye molecules, enhanced light adsorption and effective separation of electron-hole pairs. This work provides a low-cost and sustainable approach to immobilize nanostructured TiO2 on carbon fibers for environmental remediation.
Collapse
Affiliation(s)
- Bin Wang
- Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China.
| | | | | | | | | |
Collapse
|
32
|
Wang B, Karthikeyan R, Lu XY, Xuan J, Leung MKH. Hollow Carbon Fibers Derived from Natural Cotton as Effective Sorbents for Oil Spill Cleanup. Ind Eng Chem Res 2013. [DOI: 10.1021/ie402371n] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Bin Wang
- Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Rengasamy Karthikeyan
- Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Xiao-Ying Lu
- Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| | - Jin Xuan
- Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
- State-Key
Laboratory of Chemical Engineering, School of Mechanical and Power
Engineering, East China University of Science and Technology, Shanghai, China
| | - Michael K. H. Leung
- Ability R&D Energy Research Center, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
| |
Collapse
|
33
|
Abstract
Because of their relatively high efficiency, high photostability, abundance, low cost, and nontoxic qualities, titania-based photocatalysts are still the most extensively studied materials for the photocatalytic production of hydrogen from water. The effects of the chemical and physical properties of titania, including crystal phase, crystallinity, particle size, and surface area, on its photoactivity towards hydrogen generation have been identified by various investigations. The high overpotential for hydrogen generation, rapid recombination of photogenerated electrons and holes, rapid reverse reaction of molecular hydrogen and oxygen, and inability to absorb visible light are considered the most important factors that restrict the photoactivity of titania, and strategies to overcome these barriers have been developed. These issues and strategies are carefully reviewed and summarized in this Minireview. We aim to provide a critical, up-to-date overview of the development of titania-based photocatalysts for hydrogen production, as well as a comprehensive background source and guide for future research.
Collapse
Affiliation(s)
- Dennis Y C Leung
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, PR China
| | | | | | | | | | | | | |
Collapse
|
34
|
Li G, Zhang D, Yu JC, Leung MKH. An efficient bismuth tungstate visible-light-driven photocatalyst for breaking down nitric oxide. Environ Sci Technol 2010; 44:4276-4281. [PMID: 20459055 DOI: 10.1021/es100084a] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This paper reports a photocatalytic removal of 400 ppb level of NO in air under visible light irradiation by utilizing three-dimensional (3D) hierarchical bismuth tungstate (Bi(2)WO(6)) microspheres. A facile microwave-assisted hydrothermal method involving bismuth nitrate and sodium wolframate was developed to synthesize the photocatalyst. The Bi(2)WO(6) samples were characterized by using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), Raman and ultraviolet-visible reflectance (UV-vis) spectroscopy. The relationship between the physicochemical property and the photocatalytic performance of the as prepared samples is discussed. The present work demonstrates that the 3D hierarchical Bi(2)WO(6) microspheres are effective visible-light-driven photocatalytic functional materials for air purification.
Collapse
Affiliation(s)
- Guisheng Li
- Department of Chemistry, Shanghai Normal University, Shanghai 200234, China.
| | | | | | | |
Collapse
|
35
|
Ni M, Leung MKH, Leung DYC. Theoretical modelling of the electrode thickness effect on maximum power point of dye-sensitized solar cell. CAN J CHEM ENG 2008. [DOI: 10.1002/cjce.20015] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
36
|
Leung MKH, Liu CH, Chan AHS. Occupational Exposure to Volatile Organic Compounds and Mitigation by Push‐Pull Local Exhaust Ventilation in Printing Plants. J Occup Health 2005; 47:540-7. [PMID: 16369118 DOI: 10.1539/joh.47.540] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The extensive use of multiple organic solvents in offset lithographic printing causing high emissions of volatile organic compounds (VOCs) indeed poses a serious risk to printing workers' health. In this study, indoor air quality (IAQ) assessments were carried out in seven printing plants and the main objectives were to understand the effect of VOC emissions on IAQ and develop effective mitigation measures to protect workers. The thorough gas chromatography/mass spectrometry (GC/MS) measurements showed that although a variety of VOCs were presented in the indoor air, none of them was found close to individual 8-h time-weighted average (TWA) of the occupational exposure limit (OEL). The additive effect was also found below the critical value of unity. However, short-term personal exposure to total volatile organic compounds (TVOCs) was exceedingly high when a print worker carried out blanket and ink roller cleaning procedures. Therefore, the occupational health risk was mainly due to repeated short-term exposures during intermittent VOC-emitting procedures rather than long-term exposure to background VOCs. Push-pull local exhaust ventilation (LEV) was identified as an effective mitigation measure. Computational fluid dynamics (CFD) analysis was conducted to study the push-pull LEV operation. It was found that there existed a threshold LEV air flow rate for an abrupt reduction in the worker's exposure to VOCs. The reduction was less sensitive when the LEV airflow was further increased beyond the threshold. These phenomena, consistent with experimental results reported by other investigators, were explained by detailed CFD analysis showing the competition between the general ventilation and the push-pull LEV to become the dominating driving force for the resultant local flow pattern.
Collapse
|