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Chu YC, Chen KH, Tung CW, Chen HC, Wang J, Kuo TR, Hsu CS, Lin KH, Tsai LD, Chen HM. Dynamic (Sub)surface-Oxygen Enables Highly Efficient Carbonyl-Coupling for Electrochemical Carbon Dioxide Reduction. Adv Mater 2024:e2400640. [PMID: 38621196 DOI: 10.1002/adma.202400640] [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: 01/12/2024] [Revised: 04/03/2024] [Indexed: 04/17/2024]
Abstract
Nowadays, high-valent Cu species (i.e., Cuδ +) are clarified to enhance multi-carbon production in electrochemical CO2 reduction reaction (CO2RR). Nonetheless, the inconsistent average Cu valence states are reported to significantly govern the product profile of CO2RR, which may lead to misunderstanding of the enhanced mechanism for multi-carbon production and results in ambiguous roles of high-valent Cu species. Dynamic Cuδ + during CO2RR leads to erratic valence states and challenges of high-valent species determination. Herein, an alternative descriptor of (sub)surface oxygen, the (sub)surface-oxygenated degree (κ), is proposed to quantify the active high-valent Cu species on the (sub)surface, which regulates the multi-carbon production of CO2RR. The κ validates a strong correlation to the carbonyl (*CO) coupling efficiency and is the critical factor for the multi-carbon enhancement, in which an optimized Cu2O@Pd2.31 achieves the multi-carbon partial current density of ≈330 mA cm-2 with a faradaic efficiency of 83.5%. This work shows a promising way to unveil the role of high-valent species and further achieve carbon neutralization.
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Affiliation(s)
- You-Chiuan Chu
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
| | - Kuan-Hsu Chen
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
| | - Ching-Wei Tung
- Center for Environmental Sustainability and Human Health, Ming Chi University of Technology, New Taipei, 24301, Taiwan
| | - Hsiao-Chien Chen
- Center for Reliability Science and Technologies, Center for Sustainability and Energy Tecnhologies, Chang Gung University, Taoyuan, 33302, Taiwan
| | - Jiali Wang
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
| | - Tsung-Rong Kuo
- Graduate Institute of Nanomedicine and Medical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
- Precision Medicine and Translational Cancer Research Center, Taipei Medical University Hospital, Taipei, Taiwan
| | - Chia-Shuo Hsu
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
| | - Kuo-Hsin Lin
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu, 31040, Taiwan
| | - Li Duan Tsai
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu, 31040, Taiwan
| | - Hao Ming Chen
- Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei, 10617, Taiwan
- Graduate Institute of Nanomedicine and Medical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
- National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
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Thirumurugan S, Dash P, Lin YC, Sakthivel R, Sun YS, Lin CP, Wang AN, Liu X, Dhawan U, Tung CW, Chung RJ. Synergistic effect of photothermal and magnetic hyperthermia for in situ activation of Fenton reaction in tumor microenvironment for chemodynamic therapy. Biomater Adv 2024; 157:213724. [PMID: 38134729 DOI: 10.1016/j.bioadv.2023.213724] [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: 08/31/2023] [Revised: 12/02/2023] [Accepted: 12/04/2023] [Indexed: 12/24/2023]
Abstract
Traditional cancer treatments are ineffective and cause severe adverse effects. Thus, the development of chemodynamic therapy (CDT) has the potential for in situ catalysis of endogenous molecules into highly toxic species, which would then effectively destroy cancer cells. However, the shortage of high-performance nanomaterials hinders the broad clinical application of this approach. In present study, an effective therapeutic platform was developed using a simple hydrothermal method for the in-situ activation of the Fenton reaction within the tumor microenvironment (TME) to generate substantial quantities of •OH and ultimately destroy cancer cells, which could be further synergistically increased by photothermal therapy (PHT) and magnetic hyperthermia (MHT) aided by FeMoO4 nanorods (NRs). The produced FeMoO4 NRs were used as MHT/PHT and Fenton catalysts. The photothermal conversion efficiency of the FeMoO4 NRs was 31.75 %. In vitro and \ experiments demonstrated that the synergistic combination of MHT/PHT/CDT notably improved anticancer efficacy. This work reveals the significant efficacy of CDT aided by both photothermal and magnetic hyperthermia and offers a feasible strategy for the use of iron-based nanoparticles in the field of biomedical applications.
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Affiliation(s)
- Senthilkumar Thirumurugan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 106344, Taiwan
| | - Pranjyan Dash
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 106344, Taiwan
| | - Yu-Chien Lin
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 106344, Taiwan
| | - Rajalakshmi Sakthivel
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 106344, Taiwan
| | - Ying-Sui Sun
- School of Dental Technology, College of Oral Medicine, Taipei Medical University, Taipei 110301, Taiwan
| | - Ching-Po Lin
- Institute of Neuroscience, National Yang Ming Chiao Tung University, Taipei 112304, Taiwan
| | | | - Xinke Liu
- College of Materials Science and Engineering, Chinese Engineering and Research Institute of Microelectronics, Shenzhen University, Shenzhen 518060, China; Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Udesh Dhawan
- Centre for the Cellular Microenvironment, Division of Biomedical Engineering, James Watt School of Engineering, Mazumdar-Shaw Advanced Research Centre, University of Glasgow, Glasgow, G116EW, UK
| | - Ching-Wei Tung
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 243303, Taiwan.
| | - Ren-Jei Chung
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 106344, Taiwan; High-value Biomaterials Research and Commercialization Center, National Taipei University of Technology (Taipei Tech), Taipei 106344, Taiwan.
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Sakthivel R, Lin YC, Yu MC, Dhawan U, Liu X, Chen JC, Tung CW, Chung RJ. A sensitive sandwich-type electrochemical immunosensor using nitrogen-doped graphene/metal-organic framework-derived CuMnCoO x and Au/MXene for the detection of breast cancer biomarker. Colloids Surf B Biointerfaces 2024; 234:113755. [PMID: 38241894 DOI: 10.1016/j.colsurfb.2024.113755] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 01/08/2024] [Accepted: 01/10/2024] [Indexed: 01/21/2024]
Abstract
In terms of cancer-related deaths among women, breast cancer (BC) is the most common. Clinically, human epidermal growth receptor 2 (HER2) is one of the most commonly used diagnostic biomarkers for facilitating BC cell proliferation and malignant growth. In this study, a disposable gold electrode (DGE) modified with gold nanoparticle-decorated Ti3C2Tx (Au/MXene) was utilized as a sensing platform to immobilize the capturing antibody (Ab1/Au/MXene). Subsequently, nitrogen-doped graphene (NG) with a metal-organic framework (MOF)-derived copper-manganese-cobalt oxide, tagged as NG/CuMnCoOx, was used as a probe to label the detection antibody (Ab2). A sandwich-type immunosensor (NG/CuMnCoOx/Ab2/HER2-ECD /Ab1/Au/MXene/DGE) was developed to quantify HER2-ECD. NG/CuMnCoOx enhances the conductivity, electrocatalytic active sites, and surface area to immobilize Ab2. In addition, Au/MXene facilitates electron transport and captures more Ab1 on its surface. Under optimal conditions, the resultant immunosensor displayed an excellent linear range of 0.0001 to 50.0 ng. mL-1. The detection limit was 0.757 pg·mL-1 with excellent selectivity, appreciable reproducibility, and high stability. Moreover, the applicability for determining HER2-ECD in human serum samples indicates its ability to monitor tumor markers clinically.
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Affiliation(s)
- Rajalakshmi Sakthivel
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei, Taiwan
| | - Yu-Chien Lin
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei, Taiwan; Institute of Biomedical Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
| | - Min-Chin Yu
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei, Taiwan
| | - Udesh Dhawan
- Centre for the Cellular Microenvironment, Division of Biomedical Engineering, James Watt School of Engineering, Mazumdar-Shaw Advanced Research Centre, University of Glasgow, Glasgow, UK
| | - Xinke Liu
- College of Materials Science and Engineering, Chinese Engineering and Research Institute of Microelectronics, Shenzhen University, Shenzhen, China; Department of Electrical and Computer Engineering, National University of Singapore, Singapore
| | - Jung-Chih Chen
- Institute of Biomedical Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan; Department of Electronics and Electrical Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan; Catholic Mercy Hospital, Catholic Mercy Medical Foundation, Hsinchu, Taiwan; Medical Device Innovation & Translation Centre, National Yang Ming Chiao Tung University, Taipei, Taiwan.
| | - Ching-Wei Tung
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, Taiwan.
| | - Ren-Jei Chung
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei, Taiwan; High-value Biomaterials Research and Commercialization Center, National Taipei University of Technology (Taipei Tech), Taipei, Taiwan.
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Prasanna SB, Lin YC, Ramaraj SK, Dhawan U, Liu X, Tung CW, Sakthivel R, Chung RJ. 2D/2D heterostructure Ni-Fe LDH/black phosphorus nanosheets with AuNP for noxious substance diphenylamine detection in food samples. Food Chem 2024; 432:137295. [PMID: 37659324 DOI: 10.1016/j.foodchem.2023.137295] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 08/17/2023] [Accepted: 08/24/2023] [Indexed: 09/04/2023]
Abstract
In this study, gold nanoparticles decorated on nickel-iron layered double hydroxide with black phosphorus nanosheets (AuNP/Ni-Fe LDH/BPNSs) composite were prepared using a stirring method. Analyte tracing is required for developing viable sensors. The AuNP/Ni-Fe LDH/BPNSs composite exhibited a large specific surface area, high conductivity, high electrocatalytic activity, and rapid electron transfer. These properties play a vital role in monitoring diphenylamine (DPA) in food samples. The formation of the AuNP/Ni-Fe LDH/BPNSs composite was confirmed using various structural and morphological characterization techniques. The electroanalytical character of the AuNP/Ni-Fe LDH/BPNSs composite was evaluated using voltammetry. Interestingly, the AuNP/Ni-Fe LDH/BPNSs showed a wide linear range of 0.0125-1003.82 μM and a detection limit of 4.63 nM with a sensitivity of 0.399 µA µM-1 cm-2. The constructed sensor shows considerable selectivity, stability, repeatability, and reproducibility, and the practicability of DPA was monitored in the apples, sweet tomatoes, pears, and grapes with satisfactory recoveries.
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Affiliation(s)
- Sanjay Ballur Prasanna
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 10608, Taiwan
| | - Yu-Chien Lin
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 10608, Taiwan
| | - Sayee Kannan Ramaraj
- PG& Research Department of Chemistry, Thiagarajar College, Madurai 09, Tamilnadu, India
| | - Udesh Dhawan
- Centre for the Cellular Microenvironment, Division of Biomedical Engineering, James Watt School of Engineering, Mazumdar-Shaw Advanced Research Centre, University of Glasgow, Glasgow G116EW, UK
| | - Xinke Liu
- College of Materials Science and Engineering, Chinese Engineering and Research Institute of Microelectronics, Shenzhen University, Shenzhen 518060, China; Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Ching-Wei Tung
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, Taiwan.
| | - Rajalakshmi Sakthivel
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 10608, Taiwan.
| | - Ren-Jei Chung
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology (Taipei Tech), Taipei 10608, Taiwan; High-value Biomaterials Research and Commercialization Center, National Taipei University of Technology (Taipei Tech), Taipei 10608, Taiwan.
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5
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Li H, Song Q, Wan S, Tung CW, Liu C, Pan Y, Luo G, Chen HM, Cao S, Yu J, Zhang L. Atomic Interface Engineering of Single-Atom Pt/TiO 2 -Ti 3 C 2 for Boosting Photocatalytic CO 2 Reduction. Small 2023; 19:e2301711. [PMID: 37093181 DOI: 10.1002/smll.202301711] [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: 02/27/2023] [Revised: 04/02/2023] [Indexed: 05/03/2023]
Abstract
Solar-driven CO2 conversion into valuable fuels is a promising strategy to alleviate the energy and environmental issues. However, inefficient charge separation and transfer greatly limits the photocatalytic CO2 reduction efficiency. Herein, single-atom Pt anchored on 3D hierarchical TiO2 -Ti3 C2 with atomic-scale interface engineering is successfully synthesized through an in situ transformation and photoreduction method. The in situ growth of TiO2 on Ti3 C2 nanosheets can not only provide interfacial driving force for the charge transport, but also create an atomic-level charge transfer channel for directional electron migration. Moreover, the single-atom Pt anchored on TiO2 or Ti3 C2 can effectively capture the photogenerated electrons through the atomic interfacial PtO bond with shortened charge migration distance, and simultaneously serve as active sites for CO2 adsorption and activation. Benefiting from the synergistic effect of the atomic interface engineering of single-atom Pt and interfacial TiOTi, the optimized photocatalyst exhibits excellent CO2 -to-CO conversion activity of 20.5 µmol g-1 h-1 with a selectivity of 96%, which is five times that of commercial TiO2 (P25). This work sheds new light on designing ideal atomic-scale interface and single-atom catalysts for efficient solar fuel conversation.
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Affiliation(s)
- Han Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Qinjun Song
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Sijie Wan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Ching-Wei Tung
- Department of Materials Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan
| | - Chengyuan Liu
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Yang Pan
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - GuoQiang Luo
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
- Graduate Institute of Nanomedicine and Medical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
| | - Shaowen Cao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Jiaguo Yu
- Laboratory of Solar Fuel, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China
| | - LianMeng Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
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Zhu Y, Chen G, Chu YC, Hsu CS, Wang J, Tung CW, Chen HM. Distal Fe3+‐sited Hetero‐atomic Pairs Boosting Water Oxidation. Angew Chem Int Ed Engl 2022; 61:e202211142. [DOI: 10.1002/anie.202211142] [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] [Received: 07/28/2022] [Indexed: 11/11/2022]
Affiliation(s)
- Yanping Zhu
- National Taiwan University Department of Chemistry TAIWAN
| | - Gao Chen
- The Hong Kong Polytechnic University Department of Applied Physics HONG KONG
| | - You-Chiuan Chu
- National Taiwan University Department of Chemistry TAIWAN
| | - Chia-Shuo Hsu
- National Taiwan University Department of Chemistry TAIWAN
| | - Jiali Wang
- National Taiwan University Department of Chemistry TAIWAN
| | - Ching-Wei Tung
- National Taiwan University Department of Chemistry TAIWAN
| | - Hao Ming Chen
- National Taiwan University Department of Chemistry No. 1, Sec. 4. Roosevelt Rd. 10617 Taipei TAIWAN
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Zhu Y, Chen G, Chu YC, Hsu CS, Wang J, Tung CW, Chen HM. Distal Fe3+‐sited Hetero‐atomic Pairs Boosting Water Oxidation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202211142] [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: 11/08/2022]
Affiliation(s)
- Yanping Zhu
- National Taiwan University Department of Chemistry TAIWAN
| | - Gao Chen
- The Hong Kong Polytechnic University Department of Applied Physics HONG KONG
| | - You-Chiuan Chu
- National Taiwan University Department of Chemistry TAIWAN
| | - Chia-Shuo Hsu
- National Taiwan University Department of Chemistry TAIWAN
| | - Jiali Wang
- National Taiwan University Department of Chemistry TAIWAN
| | - Ching-Wei Tung
- National Taiwan University Department of Chemistry TAIWAN
| | - Hao Ming Chen
- National Taiwan University Department of Chemistry No. 1, Sec. 4. Roosevelt Rd. 10617 Taipei TAIWAN
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Huang YP, Tung CW, Chen TL, Hsu CS, Liao MY, Chen HC, Chen HM. In situ probing the dynamic reconstruction of copper-zinc electrocatalysts for CO 2 reduction. Nanoscale 2022; 14:8944-8950. [PMID: 35713505 DOI: 10.1039/d2nr01478e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Unravelling the dynamic characterization of electrocatalysts during the electrochemical CO2 reduction reaction (CO2RR) is a critical factor to improve the production efficiency and selectivity, since most pre-electrocatalysts undergo structural reconstruction and surface rearrangement under working conditions. Herein, a series of pre-electrocatalysts including CuO, ZnO and two different ratios of CuO/ZnO were systematically designed by a sputtering process to clarify the correlation of the dynamic characterization of Cu sites in the presence of Zn/ZnO and the product profile. The evidence provided by in situ X-ray absorption spectroscopy (XAS) indicated that appropriate Zn/ZnO levels could induce a variation in the coordination number of Cu sites via reversing Ostwald ripening. Specifically, the recrystallized Cu site with a lower coordination number exhibited a preferential production of methane (CH4). More importantly, our findings provide a promising approach for the efficient production of CH4 by in situ reconstructing Cu-based binary electrocatalysts.
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Affiliation(s)
- Yen-Po Huang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
| | - Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
| | - Tai-Lung Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
| | - Chia-Shuo Hsu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
| | - Mei-Yi Liao
- Department of Applied Chemistry, National Pingtung University, Pingtung 90003, Taiwan.
| | - Hsiao-Chien Chen
- Center for Reliability Science and Technologies, Chang Gung University, Taoyuan 33302, Taiwan.
- Kidney Research Center, Department of Nephrology, Chang Gung Memorial Hospital, Linkou, Taoyuan 33305, Taiwan
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
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Tung CW, Huang YP, Hsu CS, Chen TL, Chang CJ, Chen HM, Chen HC. Tracking the in situ generation of hetero-metal–metal bonds in phosphide electrocatalysts for electrocatalytic hydrogen evolution. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00459c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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
The in situ EXAFS experiments indicated that the Co–Ru moiety suppresses the formation of metallic Co under acidic conditions and dominates the catalytic activity of Rux@CoP electrocatalysts.
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Affiliation(s)
- Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Yu-Ping Huang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Chia-Shuo Hsu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Tai-Lung Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Chia-Jui Chang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Hsiao-Chien Chen
- Center for Reliability Science and Technologies, Chang Gung University, Taoyuan 33302, Taiwan
- Kidney Research Center, Department of Nephrology, Chang Gung Memorial Hospital, Linkou, Taoyuan 33305, Taiwan
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Sun H, Tung CW, Qiu Y, Zhang W, Wang Q, Li Z, Tang J, Chen HC, Wang C, Chen HM. Atomic Metal-Support Interaction Enables Reconstruction-Free Dual-Site Electrocatalyst. J Am Chem Soc 2021; 144:1174-1186. [PMID: 34935380 DOI: 10.1021/jacs.1c08890] [Citation(s) in RCA: 68] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Real bifunctional electrocatalysts for hydrogen evolution reaction and oxygen evolution reaction have to be the ones that exhibit a steady configuration during/after reaction without irreversible structural transformation or surface reconstruction. Otherwise, they can be termed as "precatalysts" rather than real catalysts. Herein, through a strongly atomic metal-support interaction, single-atom dispersed catalysts decorating atomically dispersed Ru onto a nickel-vanadium layered double hydroxide (LDH) scaffold can exhibit excellent HER and OER activities. Both in situ X-ray absorption spectroscopy and operando Raman spectroscopic investigation clarify that the presence of atomic Ru on the surface of nickel-vanadium LDH is playing an imperative role in stabilizing the dangling bond-rich surface and further leads to a reconstruction-free surface. Through strong metal-support interaction provided by nickel-vanadium LDH, the significant interplay can stabilize the reactive atomic Ru site to reach a small fluctuation in oxidation state toward cathodic HER without reconstruction, while the atomic Ru site can stabilize the Ni site to have a greater structural tolerance toward both the bond constriction and structural distortion caused by oxidizing the Ni site during anodic OER and boost the oxidation state increase in the Ni site that contributes to its superior OER performance. Unlike numerous bifunctional catalysts that have suffered from the structural reconstruction/transformation for adapting the HER/OER cycles, the proposed Ru/Ni3V-LDH is characteristic of steady dual reactive sites with the presence of a strong metal-support interaction (i.e., Ru and Ni sites) for individual catalysis in water splitting and is revealed to be termed as a real bifunctional electrocatalyst.
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Affiliation(s)
- Huachuan Sun
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Yang Qiu
- Pico Center, SUSTech Core Research Facilities, Southern University of Science and Technology, ShenZhen 518055, People's Republic of China
| | - Wei Zhang
- Institute for Energy Research, Jiangsu University, Zhenjiang 212013, People's Republic of China
| | - Qi Wang
- Pico Center, SUSTech Core Research Facilities, Southern University of Science and Technology, ShenZhen 518055, People's Republic of China
| | - Zhishan Li
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Jiang Tang
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Hsiao-Chien Chen
- Center for Reliability Science and Technologies, Chang Gung University, Taoyuan 333, Taiwan
| | - Chundong Wang
- School of Optical and Electronic Information, Wuhan National Laboratory for Optoelectronics, Optics Valley Laboratory, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan.,National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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Li X, Zeng Y, Tung CW, Lu YR, Baskaran S, Hung SF, Wang S, Xu CQ, Wang J, Chan TS, Chen HM, Jiang J, Yu Q, Huang Y, Li J, Zhang T, Liu B. Unveiling the In Situ Generation of a Monovalent Fe(I) Site in the Single-Fe-Atom Catalyst for Electrochemical CO 2 Reduction. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01621] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xuning Li
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yaqiong Zeng
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Ying-Rui Lu
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Sambath Baskaran
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Sung-Fu Hung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Shifu Wang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Cong-Qiao Xu
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Junhu Wang
- Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Jianchao Jiang
- Shaanxi Key Laboratory of Catalysis, Shaanxi University of Technology, Hanzhong 723000, China
| | - Qi Yu
- Shaanxi Key Laboratory of Catalysis, Shaanxi University of Technology, Hanzhong 723000, China
| | - Yanqiang Huang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jun Li
- Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Tao Zhang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Bin Liu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
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12
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Tung CW, Mak CM, Niu JL, Hung K, Wu Y, Tung N, Wong HM. Enlightenment of re-entry airflow: The path of the airflow and the airborne pollutants transmission in buildings. Build Environ 2021; 195:107760. [PMID: 34840404 PMCID: PMC8609235 DOI: 10.1016/j.buildenv.2021.107760] [Citation(s) in RCA: 3] [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] [Received: 12/27/2020] [Revised: 02/05/2021] [Accepted: 02/25/2021] [Indexed: 05/24/2023]
Abstract
Viable aerosols in the airflow may increase the risk of occupants contracting diseases. Natural ventilation is common in buildings and is accompanied by re-entry airflow during the ventilation process. If the re-entry airflow contains toxic or infectious species, it may cause potential harm to residents. One of the Covid-19 outbreaks occurred in a public residential building at Luk Chuen House (LC-House) in Hong Kong. It is highly suspected that the outbreak of the disease is related to the re-entry airflow. The study attempts to explain and discuss possible causes of the outbreak. In order to understand the impact of airflow on the outbreak, a public residential building similar to LC-House was used in the study. Two measurements M - I and M - II with the same settings were conducted for a sampling unit in the corridor under low and strong wind conditions respectively. The sampling unit and the tracer gas carbon dioxide (CO2) were used to simulate the index unit and infectious contaminated airflow respectively. The CO2 concentrations of the unit and corridor were measured simultaneously. Two models of Traditional Single-zone model (TSZ-model) and New Dual-zone model (NDZ-model) were used in the analysis. By comparing the ACH values obtained from the two models, it is indicated that the re-entry airflow of the unit is related to the corridor wind speeds and this provides a reasonable explanation for the outbreak in LC-House, and believes that the results can help understand the recent frequent cluster outbreaks in other residential buildings.
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Affiliation(s)
- C W Tung
- Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - C M Mak
- Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - J L Niu
- Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - K Hung
- Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Yan Wu
- School of Mechanical Engineering, Tongji University, China
| | - Nam Tung
- Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - H M Wong
- Faculty of Dentistry, The University of Hong Kong, Pok Fu Lam, Hong Kong Island, Hong Kong, China
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13
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Kuang P, Wang Y, Zhu B, Xia F, Tung CW, Wu J, Chen HM, Yu J. Pt Single Atoms Supported on N-Doped Mesoporous Hollow Carbon Spheres with Enhanced Electrocatalytic H 2 -Evolution Activity. Adv Mater 2021; 33:e2008599. [PMID: 33792090 DOI: 10.1002/adma.202008599] [Citation(s) in RCA: 117] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/03/2021] [Indexed: 05/23/2023]
Abstract
The electronic metal-support interaction (EMSI) plays a crucial role in catalysis as it can induce electron transfer between metal and support, modulate the electronic state of the supported metal, and optimize the reduction of intermediate species. In this work, the tailoring of electronic structure of Pt single atoms supported on N-doped mesoporous hollow carbon spheres (Pt1 /NMHCS) via strong EMSI engineering is reported. The Pt1 /NMHCS composite is much more active and stable than the nanoparticle (PtNP ) counterpart and commercial 20 wt% Pt/C for catalyzing the electrocatalytic hydrogen evolution reaction (HER), exhibiting a low overpotential of 40 mV at a current density of 10 mA cm-2 , a high mass activity of 2.07 A mg-1 Pt at 50 mV overpotential, a large turnover frequency of 20.18 s-1 at 300 mV overpotential, and outstanding durability in acidic electrolyte. Detailed spectroscopic characterizations and theoretical simulations reveal that the strong EMSI effect in a unique N1 -Pt1 -C2 coordination structure significantly tailors the electronic structure of Pt 5d states, resulting in promoted reduction of adsorbed proton, facilitated H-H coupling, and thus Pt-like HER activity. This work provides a constructive route for precisely designing single-Pt-atom-based robust electrocatalysts with high HER activity and durability.
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Affiliation(s)
- Panyong Kuang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan, 528200, P. R. China
| | - Yaru Wang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Bicheng Zhu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Fanjie Xia
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
- Nanostructure Research Centre (NRC), Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Jinsong Wu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
- Nanostructure Research Centre (NRC), Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Jiaguo Yu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan, 528200, P. R. China
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14
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Tung CW, Tso CH, Chen BY, Chu H, Hou CH, Chen HC, Chang MC, Shyue JJ, Lin PH, Chen HM. Heterocyclic-Additive-Activated Dinuclear Dysprosium Electrocatalysts for Heterogeneous Water Oxidation. Inorg Chem 2021; 60:6930-6938. [PMID: 33792308 DOI: 10.1021/acs.inorgchem.1c00209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Heterogeneous catalysis based on air-stable lanthanide complexes is relatively rare, especially for electrochemical water oxidation and reduction. Therefore, it is highly desired to investigate the synergy caused by cocatalysts on the lanthanide complex family for heterogeneous catalysis because of their structural diversity, air/moisture insensitivity, and easy preparation under an air atmosphere. Two mononuclear and three dinuclear dysprosium complexes containing a series of Schiff-base ligands have been demonstrated as robust electrocatalysts for triggering heterogeneous water oxidation in alkaline solution, in which the complex [Dy2(hmb)2(OAc)4]·MeCN(3) was revealed to have the best activity toward heterogeneous water oxidation among all five complexes in the present study. The molecular activation of dysprosium complexes has also been investigated with a series of N-containing heterocyclic additives [i.e., 4-(dimethylamino)pyridine (DMAP), bis(triphenylphosphine)iminium chloride ([PPN]Cl), indole, and quinoline]. In particular, the corresponding overpotential was effectively enhanced by 211 mV (at a current density of 10 mA cm-2) with the assistance of DMAP. On the basis of electrochemical and ex situ/in situ spectroscopic investigations, the best catalyst, DMAP-complex 3 on a carbon paper electrode, was confirmed with well-maintained molecular identity during heterogeneous water oxidation free of forming any dysprosium oxide and/or undesired products.
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Affiliation(s)
- Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Cheng-Han Tso
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Bo-Yi Chen
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan
| | - Hang Chu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Cheng-Hung Hou
- Research Center for Applied Sciences, Academia Sinica, Taipei 106, Taiwan
| | - Hsiao-Chien Chen
- Center for Reliability Science and Technologies, Chang Gung University, Taoyuan 333, Taiwan
| | - Mu-Chieh Chang
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Jing-Jong Shyue
- Research Center for Applied Sciences, Academia Sinica, Taipei 106, Taiwan
| | - Po-Heng Lin
- Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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15
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Chen TL, Chen HC, Huang YP, Lin SC, Hou CH, Tan HY, Tung CW, Chan TS, Shyue JJ, Chen HM. In situ unraveling of the effect of the dynamic chemical state on selective CO 2 reduction upon zinc electrocatalysts. Nanoscale 2020; 12:18013-18021. [PMID: 32856664 DOI: 10.1039/d0nr03475d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Unraveling the reaction mechanism behind the CO2 reduction reaction (CO2RR) is a crucial step for advancing the development of efficient and selective electrocatalysts to yield valuable chemicals. To understand the mechanism of zinc electrocatalysts toward the CO2RR, a series of thermally oxidized zinc foils is prepared to achieve a direct correlation between the chemical state of the electrocatalyst and product selectivity. The evidence provided by in situ Raman spectroscopy, X-ray absorption spectroscopy (XAS) and X-ray diffraction significantly demonstrates that the Zn(ii) and Zn(0) species on the surface are responsible for the production of carbon monoxide (CO) and formate, respectively. Specifically, the destruction of a dense oxide layer on the surface of zinc foil through a thermal oxidation process results in a 4-fold improvement of faradaic efficiency (FE) of formate toward the CO2RR. The results from in situ measurements reveal that the chemical state of zinc electrocatalysts could dominate the product profile for the CO2RR, which provides a promising approach for tuning the product selectivity of zinc electrocatalysts.
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Affiliation(s)
- Tai-Lung Chen
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan.
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16
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Wang J, Heil T, Zhu B, Tung CW, Yu J, Chen HM, Antonietti M, Cao S. A Single Cu-Center Containing Enzyme-Mimic Enabling Full Photosynthesis under CO 2 Reduction. ACS Nano 2020; 14:8584-8593. [PMID: 32603083 DOI: 10.1021/acsnano.0c02940] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [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: 05/19/2023]
Abstract
Polymeric carbon nitride (CN) is one of the most promising metal-free photocatalysts to alleviate the energy crisis and environmental pollution. Loading cocatalysts is regarded as an effective way to improve the photocatalytic efficiency of CNs. However, commonly used noble metal cocatalysts limit their applications due to their rarity and high cost. Herein, we present the effective synthesis of single-atom copper-modified CN via supramolecular preorganization with subsequent condensation, which provides effective charge transfer pathways by an "infused" delocalized state with variable-valence catalysis at the same time. The C-Cu-N2 single-atom catalytic site can activate CO2 molecules and reduces the energy barrier toward photocatalytic CO2 reduction. Excellent performance for photocatalytic CO2 reduction was found. This work thereby provides a general protocol of designing a noble-metal-free photocatalyst with infused metal centers toward a wide range of applications.
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Affiliation(s)
- Jiu Wang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, People's Republic of China
| | - Tobias Heil
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14476 Potsdam, Germany
| | - Bicheng Zhu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, People's Republic of China
| | - Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Jiaguo Yu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, People's Republic of China
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Markus Antonietti
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14476 Potsdam, Germany
| | - Shaowen Cao
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070 Wuhan, People's Republic of China
- Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, 14476 Potsdam, Germany
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17
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Suen NT, Kong ZR, Hsu CS, Chen HC, Tung CW, Lu YR, Dong CL, Shen CC, Chung JC, Chen HM. Morphology Manipulation of Copper Nanocrystals and Product Selectivity in the Electrocatalytic Reduction of Carbon Dioxide. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00790] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nian-Tzu Suen
- College of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, China
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Zhong-Ri Kong
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Chia-Shuo Hsu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Hsiao-Chien Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Ying-Rui Lu
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Chung-Li Dong
- Department of Physics, Tamkang University, Tamsui 25137, Taiwan
| | - Chin-Chang Shen
- Chemical Engineering Division, Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan 32546, Taiwan
| | - Jen-Chieh Chung
- Chemical Engineering Division, Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan 32546, Taiwan
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
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18
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Hsu CS, Suen NT, Hsu YY, Lin HY, Tung CW, Liao YF, Chan TS, Sheu HS, Chen SY, Chen HM. Valence- and element-dependent water oxidation behaviors: in situ X-ray diffraction, absorption and electrochemical impedance spectroscopies. Phys Chem Chem Phys 2018; 19:8681-8693. [PMID: 28272620 DOI: 10.1039/c6cp07630k] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [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
Metal oxides of the spinel family have shown great potential towards the oxygen evolution reaction (OER), but the fundamental OER mechanism of spinel oxides is still far from being completely understood, especially for the role of the metal ions. Owing to various coordinated sites of divalent/trivalent metals ions and surface conditions (morphology and defects), it is a great challenge to have a fair assessment of the electrocatalytic performance of spinel systems. Herein, we demonstrated a series of MFe2O4 (M = Fe, Co, Ni, Zn) with a well-controlled morphology to achieve a comprehensive study of electrocatalytic activity toward OER. By utilizing several in situ analyses, we could conclude a universal rule that the activities for OER in the metal oxide systems were determined by the occurrence of a phase transformation, and this structural transformation could work well in both crystallographic sites (Td and Oh sites). Additionally, the divalent metal ion significantly dominated the formation of oxyhydroxide through an epitaxial relationship, which depended on the atomic arrangement at the interface of spinel and metal oxyhydroxide, while trivalent metal ions remained unchanged as a host lattice. The metal oxyhydroxide was formed during a redox reaction rather than being formed during OER. The occurrence of the redox reaction seems to accompany a remarkable increase in resistance and capacitance might result from the structural transformation from spinel to metal oxyhydroxide. We believe that the approaching strategies and information obtained in the present study can offer a guide to designing a promising electrocatalytic system towards the oxygen evolution reaction and other fields.
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Affiliation(s)
- Chia-Shuo Hsu
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
| | - Nian-Tzu Suen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
| | - Ying-Ya Hsu
- Program for Science and Technology of Accelerator Light Source, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Hsuan-Yu Lin
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
| | - Ching-Wei Tung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
| | - Yen-Fa Liao
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Ting-Shan Chan
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Hwo-Shuenn Sheu
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - San-Yuan Chen
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
| | - Hao Ming Chen
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
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19
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Hung SF, Yu YC, Suen NT, Tzeng GQ, Tung CW, Hsu YY, Hsu CS, Chang CK, Chan TS, Sheu HS, Lee JF, Chen HM. The synergistic effect of a well-defined Au@Pt core-shell nanostructure toward photocatalytic hydrogen generation: interface engineering to improve the Schottky barrier and hydrogen-evolved kinetics. Chem Commun (Camb) 2016; 52:1567-70. [PMID: 26741953 DOI: 10.1039/c5cc08547k] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A well-defined co-catalyst system TiO2 nanotube-Au (core)-Pt (shell) was demonstrated to be the combination of the localized surface plasmon effect of gold and excellent proton reduction nature of platinum. Furthermore, surface engineering by the descending Fermi energies of gold and platinum was beneficial to electron transfer.
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Affiliation(s)
- Sung-Fu Hung
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
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20
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Hung SF, Tung CW, Chan TS, Chen HM. In situ morphological transformation and investigation of electrocatalytic properties of cobalt oxide nanostructures toward oxygen evolution. CrystEngComm 2016. [DOI: 10.1039/c6ce00796a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Niu J, Tung CW, Gao N. Inter-flat airflow and airborne disease transmission in high-rise residential buildings. Hong Kong Med J 2012; 18 Suppl 2:39-41. [PMID: 22311361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
1. A virus-spread mechanism is related to inter-flat or interzonal airflow through open windows caused by buoyancy effects. 2. Both on-site measurements and numerical simulations quantify the amount of the exhaust air that exits the upper part of the window of a floor and re-enters the lower part of the open window of the immediately upper floor. 3. Ventilation air could contain up to 7% (in terms of mass fraction) of the exhaust air from the lower floor.4. In high-rise buildings, windows flush with the façade are a major route for the vertical spread of pathogen-containing aerosols, especially those<1 μm in diameter.
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Affiliation(s)
- J Niu
- Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China.
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