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Zhang W, Wang B, Cui H, Wan Q, Yi B, Yang H. Unveiling the exciton dissociation dynamics steered by built-in electric fields in conjugated microporous polymers for photoreduction of uranium (VI) from seawater. J Colloid Interface Sci 2024; 662:377-390. [PMID: 38359502 DOI: 10.1016/j.jcis.2024.02.073] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/17/2024]
Abstract
Developing highly efficient photocatalysts based on conjugated microporous polymers (CMPs) are often impeded by the intrinsically large exciton binding energy and sluggish charge transfer kinetics that result from their vulnerable driving force. Herein, a family of pyrene-based nitrogen-implanted CMPs were constructed, where the nitrogen gradient was regulated. Accordingly, the built-in electric field endowed by the nitrogen gradient dramatically accelerates the dissociation of exciton into free carriers, thereby enhancing charge separation efficiency. As a result, PyCMP-3N generated by polymerization of 1,3,6,8-tetrakis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyrene and 2,4,6-tris(4-bromophenyl)-1,3,5-triazine featured an optimized built-in electric field and exhibited the highest photocatalytic removal efficiency of uranium (VI) (99.5 %). Our proposed strategy not only provides inspiration for constructing the built-in electric field by controlling nitrogen concentration gradients, but also offers an in-depth understanding the crucial role of built-in electric field in exciton dissociation and charge transfer, efficiently promoting CMPs photocatalysis.
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Affiliation(s)
- Weijie Zhang
- Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
| | - Bingxin Wang
- Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
| | - Haishuai Cui
- Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
| | - Quan Wan
- Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
| | - Bing Yi
- Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China
| | - Hai Yang
- Hunan Provincial Key Laboratory of Environmental Catalysis & Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, China.
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2
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Zhong F, Sheng J, Du C, He Y, Sun Y, Dong F. Ligand-mediated exciton dissociation and interparticle energy transfer on CsPbBr 3 perovskite quantum dots for efficient CO 2-to-CO photoreduction. Sci Bull (Beijing) 2024; 69:901-912. [PMID: 38302334 DOI: 10.1016/j.scib.2024.01.027] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 12/16/2023] [Accepted: 01/16/2024] [Indexed: 02/03/2024]
Abstract
Perovskite quantum dots (PQDs) hold immense potential as photocatalysts for CO2 reduction due to their remarkable quantum properties, which facilitates the generation of multiple excitons, providing the necessary high-energy electrons for CO2 photoreduction. However, harnessing multi-excitons in PQDs for superior photocatalysis remains challenging, as achieving the concurrent dissociation of excitons and interparticle energy transfer proves elusive. This study introduces a ligand density-controlled strategy to enhance both exciton dissociation and interparticle energy transfer in CsPbBr3 PQDs. Optimized CsPbBr3 PQDs with the regulated ligand density exhibit efficient photocatalytic conversion of CO2 to CO, achieving a 2.26-fold improvement over unoptimized counterparts while maintaining chemical integrity. Multiple analytical techniques, including Kelvin probe force microscopy, temperature-dependent photoluminescence, femtosecond transient absorption spectroscopy, and density functional theory calculations, collectively affirm that the proper ligand termination promotes the charge separation and the interparticle transfer through ligand-mediated interfacial electron coupling and electronic interactions. This work reveals ligand density-dependent variations in the gas-solid photocatalytic CO2 reduction performance of CsPbBr3 PQDs, underscoring the importance of ligand engineering for enhancing quantum dot photocatalysis.
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Affiliation(s)
- Fengyi Zhong
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Jianping Sheng
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China; Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
| | - Chenyu Du
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Ye He
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Yanjuan Sun
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Fan Dong
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China; Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
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3
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Yan R, Song M, Chen P, Song H, Fu C, Peng H, Yin SF. Regulating local molecular polarization of triazine-PDI based polymer for high-efficient photocatalytic coupling of benzylamine. J Colloid Interface Sci 2023; 651:68-75. [PMID: 37540931 DOI: 10.1016/j.jcis.2023.07.155] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/12/2023] [Accepted: 07/24/2023] [Indexed: 08/06/2023]
Abstract
Designing a robust built-in electric field (BF) is a charming strategy for enhancing the separation and transportation of charges via introducing large π-conjugated molecules. However, it has flexible or semiflexible geometries, which significantly disorder the crystalline and deteriorated the built-in electric field. Here, a straightforward tactic for creating a cyano-functionalized smaller D (benzene) - A (triazine) units in PDI- triazine based polymer (PDIMB) to enhance intrinsic molecule dipole has been proposed. The density functional theory (DFT) calculation revealed that the modification of smaller D-A groups destroyed the π-localization of charges, which enhanced the molecular dipole and the BF for promoting the exciton dissociation and charge transfer. Moreover, it not only exposed number of active sites, but also enhanced the interfacial molecular interacting. Therefore, PDIMB-2 exhibits high activity (24.5 mmol g-1 h-1) and selectivity (>99%) for the photooxidation of benzylamine to N-benzylidenebenzylamine under mild conditions. Our work offers a potential and simple synthetic option for enhancing the built-in electric field of polymer.
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Affiliation(s)
- Rong Yan
- Provincial Guizhou Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China
| | - Meiyang Song
- Provincial Guizhou Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China
| | - Peng Chen
- Provincial Guizhou Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China.
| | - Henghui Song
- Provincial Guizhou Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China
| | - Chengbing Fu
- Provincial Guizhou Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China.
| | - Haiyang Peng
- Provincial Guizhou Key Laboratory of Green Chemical and Clean Energy Technology, School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China
| | - Shuang-Feng Yin
- College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of Education, State Key Laboratory of Chemo/Biosensing and Chemometrics, Hunan University, Changsha 410082, China.
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4
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Li D, Liu Y, Wen C, Huang J, Li R, Liu H, Zhong J, Chen P, Lv W, Liu G. Construction of dual transfer channels in graphitic carbon nitride photocatalyst for high-efficiency environmental pollution remediation: Enhanced exciton dissociation and carrier migration. J Hazard Mater 2022; 436:129171. [PMID: 35605504 DOI: 10.1016/j.jhazmat.2022.129171] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/06/2022] [Accepted: 05/14/2022] [Indexed: 06/15/2023]
Abstract
Graphitic carbon nitride (g-C3N4) is a promising candidate for photocatalysis, but exhibits moderate activity due to strongly bound excitons and sluggish charge migration. The dissociation of excitons to free electrons and holes is considered an effective strategy to enhance photocatalytic activity. Herein, a novel boron nitride quantum dots (BNQDs) modified P-doped g-C3N4 photocatalyst (BQPN) was successfully prepared by thermal polymerization method. Photoluminescence techniques and photoelectrochemical tests demonstrated that the introduction of P atoms and BNQDs promoted the dissociation of excitons and the migration of photogenerated carriers. Specifically, theoretical calculations revealed that P substitutions were the sites of pooled electrons, while BNQDs were the excellent photogenerated hole extractors. Accordingly, compared with g-C3N4, the BQPN showed improved performance in degrading four non-steroidal anti-inflammatory drugs (NSAIDs) under visible light irradiation. This work not only establishes an in-depth understanding of excitonic regulation in g-C3N4, but also offers a promising photocatalytic technology for environmental remediation.
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Affiliation(s)
- Daguang Li
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Yang Liu
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China
| | - Chenghui Wen
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Jiaxing Huang
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China
| | - Ruobai Li
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China
| | - Haijin Liu
- School of Environment, Henan Normal University, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Xinxiang 453007, China
| | - Jiapeng Zhong
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Ping Chen
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Wenying Lv
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Guoguang Liu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
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Sui X, Wang H, Liang C, Zhang Q, Bo H, Wu K, Zhu Z, Gong Y, Yue S, Chen H, Shang Q, Mi Y, Gao P, Zhang Y, Meng S, Liu X. Ultrafast Internal Exciton Dissociation through Edge States in MoS 2 Nanosheets with Diffusion Blocking. Nano Lett 2022; 22:5651-5658. [PMID: 35786976 DOI: 10.1021/acs.nanolett.1c04987] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Edge states of two-dimensional transition-metal dichalcogenides (TMDCs) are crucial to quantum circuits and optoelectronics. However, their dynamics are pivotal but remain unclear due to the edge states being obscured by their bulk counterparts. Herein, we study the state-resolved transient absorption spectra of ball-milling-produced MoS2 nanosheets with 10 nm lateral size with highly exposed free edges. Electron energy loss spectroscopy and first-principles calculations confirm that the edge states are located in the range from 1.23 to 1.78 eV. Upon above bandgap excitations, excitons populate and diffuse toward the boundary, where the potential gradient blocks excitons and the edge states are formed through interband transitions within 400 fs. With below bandgap excitations, edge states are slowed down to 1.1 ps due to the weakened valence orbital coupling. These results shed light on the fundamental exciton dissociation processes on the boundary of functionalized TMDCs, enabling the ground work for applications in optoelectronics and light-harvesting.
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Affiliation(s)
- Xinyu Sui
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Huimin Wang
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China
- The Laboratory of Soft Matter Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Cheng Liang
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Qing Zhang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Han Bo
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, P. R. China
- Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, P. R. China
| | - Keming Wu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Zhuoya Zhu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yiyang Gong
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Shuai Yue
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hailong Chen
- Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, P. R. China
| | - Qiuyu Shang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Yang Mi
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Peng Gao
- International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, P. R. China
- Electron Microscopy Laboratory, School of Physics, Peking University, Beijing 100871, P. R. China
| | - Yong Zhang
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Sheng Meng
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Xinfeng Liu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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6
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Xie X, Xu T, Fu Y, Zhao X, Zhao X. The effects of electronic structures of two non-fullerene systems on their photovoltaic performances. J Mol Model 2022; 28:172. [PMID: 35633407 DOI: 10.1007/s00894-022-05163-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 05/16/2022] [Indexed: 10/18/2022]
Abstract
In this contribution, the electronic structures of two polymer donors (PBDB-T and PBDB-T-SF) and two non-fullerene acceptors (ITIC and IT-4F) are researched by density functional theory and time-dependent density functional theory, respectively. The research purpose is to rationalize the relationship between observed experimental performances and structural properties and obtain the effects of structures on their photovoltaic performances. The investigated properties involve in the structure characteristics, absorption spectra, carrier mobilities, and exciton dissociation properties at interfaces to locate the essences of different power conversion efficiency between PBDB-T/ITIC and PBDB-T-SF/IT-4F. The results suggest that both PBDB-T/ITIC and PBDB-T-SF/IT-4F systems have stable structures and relatively high HOMO levels, which benefits to relatively large VOC values. In addition, the larger PCE of PBDB-T-SF/IT-4F system originates from PBDB-T-SF's large hole transport properties and better exciton dissociation ability. Furthermore, the F and S incorporations enhance hole mobilities and exciton dissociation ability. Consequently, the theoretical results coincide well with the experimental ones.
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7
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Song Q, Hu J, Zhou Y, Ye Q, Shi X, Li D, Jiang D. Carbon vacancy-mediated exciton dissociation in Ti 3C 2T x/g-C 3N 4 Schottky junctions for efficient photoreduction of CO 2. J Colloid Interface Sci 2022; 623:487-499. [PMID: 35597018 DOI: 10.1016/j.jcis.2022.05.064] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [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: 03/01/2022] [Revised: 05/09/2022] [Accepted: 05/10/2022] [Indexed: 12/18/2022]
Abstract
Earth-abundant g-C3N4 is a promising photocatalyst for CO2 reduction, but its practical application is severely limited by the excitonic effect of g-C3N4 derived from strong binding energy and lack of electron-enriched active sites. Herein, we design a novel 2D/2D Schottky junction photocatalysts comprising of Ti3C2Tx-modified defective g-C3N4 nanosheets with carbon vacancy (denoted as Ti3C2Tx/Vc-CN) by a self-assembly method. The carbon vacancies in g-C3N4 promote exciton dissociation into free charge, while the formed Schottky junctions between Ti3C2Tx and Vc-CN further enables a directional charge transfer, thus providing an electron-rich catalytic surface for the CO2 reduction. Thanks to the synergy of promoted exciton dissociation and directional electron transfer, the optimal 20% Ti3C2Tx/Vc-CN display a high CO evolution rate of 20.54 µmol·g-1·h-1 under visible light irradiation, which is 7.4 times higher than that of bare CN. This work highlights the synergy of the promoted exciton dissociation and directional electron transfer in the activity enhancement of photocatalytic CO2 reduction.
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Affiliation(s)
- Qi Song
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China
| | - Jiahui Hu
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China
| | - Yimeng Zhou
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China
| | - Qianjin Ye
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China
| | - Xiangli Shi
- Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China
| | - Di Li
- Institute for Energy Research, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China
| | - Deli Jiang
- School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang 212013, China.
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Zhou Z, Li K, Deng W, Li J, Yan Y, Li Y, Quan X, Wang T. Nitrogen vacancy mediated exciton dissociation in carbon nitride nanosheets: Enhanced hydroxyl radicals generation for efficient photocatalytic degradation of organic pollutants. J Hazard Mater 2020; 387:122023. [PMID: 31927350 DOI: 10.1016/j.jhazmat.2020.122023] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 12/11/2019] [Accepted: 01/02/2020] [Indexed: 06/10/2023]
Abstract
Polymeric materials are promising candidates as photocatalysts for environmental purification, however their catalytic performance are still unsatisfactory mainly due to the strong Coulomb interactions between electron and hole that leads to fast charge recombination. Herein, taking graphitic carbon nitride as an example, we verify that installing carbon nitride nanosheets with nitrogen vacancy could break the intrinsic electronic state distribution, forming energy disordered interfaces around the vacancies with the energy difference as large as 0.35 eV. Such a large energy difference is found energetic enough to overcome the strong Coulomb interactions between electron and hole for hot electron and hole generation, as a result showing high electron-hole separation efficiency. Benefited from these advantages, the as prepared material shows remarkable photocatalytic performance toward organic pollutants degradation. The improved catalytic performance is originated from the promoted exciton dissociation that leads to ultra high hydroxyl radical generation. This study offers a new understanding of the excitonic effects for designing advanced polymeric photocatalyst for energy and environment related applications.
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Affiliation(s)
- Zhentao Zhou
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, NanChang Hangkong University, NanChang 330063, People's Republic of China
| | - Kexin Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, NanChang Hangkong University, NanChang 330063, People's Republic of China.
| | - Wenying Deng
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, NanChang Hangkong University, NanChang 330063, People's Republic of China
| | - Jun Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, NanChang Hangkong University, NanChang 330063, People's Republic of China
| | - Yinhua Yan
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, NanChang Hangkong University, NanChang 330063, People's Republic of China
| | - Yawen Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, NanChang Hangkong University, NanChang 330063, People's Republic of China
| | - Xiaoke Quan
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, NanChang Hangkong University, NanChang 330063, People's Republic of China
| | - Tong Wang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, NanChang Hangkong University, NanChang 330063, People's Republic of China
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Kim BS, Neo DJ, Hou B, Park JB, Cho Y, Zhang N, Hong J, Pak S, Lee S, Sohn JI, Assender HE, Watt AAR, Cha S, Kim J. High Performance PbS Quantum Dot/Graphene Hybrid Solar Cell with Efficient Charge Extraction. ACS Appl Mater Interfaces 2016; 8:13902-8. [PMID: 27213219 PMCID: PMC4928821 DOI: 10.1021/acsami.6b02544] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 05/13/2016] [Indexed: 05/19/2023]
Abstract
Hybrid colloidal quantum dot (CQD) solar cells are fabricated from multilayer stacks of lead sulfide (PbS) CQD and single layer graphene (SG). The inclusion of graphene interlayers is shown to increase power conversion efficiency by 9.18%. It is shown that the inclusion of conductive graphene enhances charge extraction in devices. Photoluminescence shows that graphene quenches emission from the quantum dot suggesting spontaneous charge transfer to graphene. CQD photodetectors exhibit increased photoresponse and improved transport properties. We propose that the CQD/SG hybrid structure is a route to make CQD thin films with improved charge extraction, therefore resulting in improved solar cell efficiency.
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Affiliation(s)
- Byung-Sung Kim
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
| | - Darren
C. J. Neo
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - Bo Hou
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
| | - Jong Bae Park
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
- Jeonju
Centre, Korea Basic Science Institute, Jeonju, Jeollabuk-do 561-180, Republic of Korea
| | - Yuljae Cho
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
| | - Nanlin Zhang
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - John Hong
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
| | - Sangyeon Pak
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
| | - Sanghyo Lee
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
| | - Jung Inn Sohn
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
| | - Hazel E. Assender
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
| | - Andrew A. R. Watt
- Department
of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, U.K.
- E-mail:
| | - SeungNam Cha
- Department
of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.
- E-mail:
| | - Jong
Min Kim
- Department
of Engineering, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 0FA, U.K.
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