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Xiang D, Jin X, Sun G, Zhong C, Gao S. Oxygen vacancy engineering of ultra-small CuWO 4 nanoparticles for boosting photocatalytic organic pollutant degradation. Dalton Trans 2024; 53:7839-7847. [PMID: 38624191 DOI: 10.1039/d4dt00628c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Nanomaterials have attracted great interest in the field of photocatalytic degradation due to their larger specific surface area and efficient charge/mass transfer ability, which are beneficial for enhancing photocatalytic activity. However, the bandgap of photocatalysts would increase with the size reduction, weakening the photoabsorption ability. Thus the relationship between the size of catalysts and photoactivity should be balanced to achieve optimal photocatalytic performance. Herein, ultra-small CuWO4 nanoparticles (ca. 39 nm) with moderate oxygen vacancies (CuWO4-OVs) were synthesized by the cascade strategy (ligand confinement@fast calcination). The introduction of oxygen vacancies offset the deficiency of light absorption ability caused by the small size effect. Besides, oxygen vacancies could provide more reaction active sites, conducive to the adsorption and activation of dye molecules and H2O. Degradation experiments reveal that the optimized photocatalyst CuWO4-OVs 350 shows outstanding photocatalytic activity, and the removal ratio of methylene blue (MB) reaches over 90.26% in 70 min, exceeding that of pure CuWO4-air (37.66%). Additionally, the degradation performance of CuWO4-OVs 350 surpasses most of the other CuWO4-based photocatalytic systems. More importantly, the photocatalytic degradation activity of CuWO4-OVs 350 could remain at 88.26% even after five cycles, and high photostability was achieved. This work affords constructive inspiration for synergistic photoactivity enhancement and increase of catalyst reaction active sites to achieve eminent photocatalytic degradation performance.
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Affiliation(s)
- Dingzhou Xiang
- School of Chemistry and Chemical Engineering, Faculty of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, 230601 Hefei, Anhui, P.R. China.
| | - Xin Jin
- School of Chemistry and Chemical Engineering, Faculty of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, 230601 Hefei, Anhui, P.R. China.
| | - Guilin Sun
- School of Chemistry and Chemical Engineering, Faculty of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, 230601 Hefei, Anhui, P.R. China.
| | - Chenghuan Zhong
- School of Chemistry and Chemical Engineering, Faculty of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, 230601 Hefei, Anhui, P.R. China.
| | - Shan Gao
- School of Chemistry and Chemical Engineering, Faculty of Materials Science and Engineering, Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, 230601 Hefei, Anhui, P.R. China.
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Koshki MS, Zirak M, Kazemi M, Alehdaghi H, Baghayeri M, Nodehi M, Rabiee N. Molybdenum-doped BiVO 4 thin films: Facile preparation via hot-spin coating method and the relationship between surface statistical parameters and photoelectrochemical activity. CHEMOSPHERE 2024; 346:140579. [PMID: 38303391 DOI: 10.1016/j.chemosphere.2023.140579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 10/13/2023] [Accepted: 10/26/2023] [Indexed: 02/03/2024]
Abstract
Molybdenum-doped BiVO4 thin films were uniformly coated on indium-doped tin oxide (ITO) substrates via a facile modified hot spin coating (HSC) technique. The prepared layers were used as photoanode in a photoelectrochemical (PEC) cell. Different percentage of Mo dopant was examined to maximize the photo-current density (J) of the layers. The highest J value (872 ± 8 μA/cm2) was obtained by 5 atomic% of Mo doping. After that, the surface topographies of these samples were changed by varying the initial precursor concentration from 27 to 80 mM. The relation between surface topographies and the PEC activity of Mo-doped BiVO4 thin films was investigated from microscopic point of view by calculating the surface roughness exponent of α, and a mechanism for the PEC activity of Mo-doped BiVO4 photoanodes was proposed accordingly. The sample with a small roughness exponent provided a surface with jagged microscopic fluctuations which may trap the air molecules between the electrolyte and sample surface, hindering the fine atomic interaction for photo-generated electron-hole transition. Therefore, the layer with the highest roughness exponent (2α = 0.48 ± 0.03), which means the smoother microscopic surface and better interfacial contact with the electrolyte, exhibited the best PEC activity.
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Affiliation(s)
- Mina-Sadat Koshki
- Department of Chemistry, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
| | - Mohammad Zirak
- Department of Physics, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran.
| | - Maziyar Kazemi
- Department of Physics, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
| | - Hassan Alehdaghi
- Department of Physics, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
| | - Mehdi Baghayeri
- Department of Chemistry, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran; Department of Natural Sciences, Lebanese American University, Beirut, Lebanon
| | - Marzieh Nodehi
- Department of Chemistry, Faculty of Science, Hakim Sabzevari University, P. O. Box 397, Sabzevar, Iran
| | - Navid Rabiee
- School of Engineering, Macquarie University, Sydney, NSW, 2109, Australia.
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Niu Q, Chen Q, Huang G, Li L, He Y, Bi J. Build-in electric field in CuWO 4/covalent organic frameworks S-scheme photocatalysts steer boosting charge transfer for photocatalytic CO 2 reduction. J Colloid Interface Sci 2023; 643:102-114. [PMID: 37054545 DOI: 10.1016/j.jcis.2023.04.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/29/2023] [Accepted: 04/03/2023] [Indexed: 04/15/2023]
Abstract
Covalent organic frameworks (COFs) are crystalline porous materials with enormous potential for realizing solar-driven CO2-to-fuel conversion, yet the sluggish transfer/separation of photoinduced electrons and holes remains a compelling challenge. Herein, a step (S)-scheme heterojunction photocatalyst (CuWO4-COF) was rationally fabricated by a thermal annealing method for boosting CO2 conversion to CO. The optimal CuWO4/COF composite sample, integrating 10 wt% CuWO4 with an olefin (C═C) linked COF (TTCOF), achieved a remarkable gas-solid phase CO yield as high as 7.17 ± 0.35 μmol g-1h-1 under visible light irradiation, which was significantly higher than the pure COF (1.6 ± 0.29 μmol g-1h-1). The enhanced CO2 conversion rate could be attributable to the interface engineering effect and the formation of internal electric field (IEF) directing from TTCOF to CuWO4 according to the theoretical calculation and experimental results, which also proves the electrons transfer from TTCOF to CuWO4 upon hybridization. In addition, driven by the IEF, the photoinduced electrons can be steered from CuWO4 to TTCOF under visible light irradiation as well-elucidated by in-situ irradiated X-ray photoelectron spectroscopy, verifying the S-scheme charge transfer pathway over CuWO4/COF composite heterojunctions, which greatly foster the photoreduction activity of CO2. The preparation technique of the S-scheme heterojunction photocatalyst in this study provides a paradigmatic protocol for photocatalytic solar fuel generation.
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Affiliation(s)
- Qing Niu
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China; Key Laboratory of Eco-materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China
| | - Qiaoshan Chen
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China
| | - Guocheng Huang
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China.
| | - Liuyi Li
- Key Laboratory of Eco-materials Advanced Technology, College of Materials Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China
| | - Yunhui He
- Fujian College Association Instrumental Analysis Center of Fuzhou University, Minhou, Fujian 350108, PR China
| | - Jinhong Bi
- Department of Environmental Science and Engineering, Fuzhou University, Minhou, Fujian 350108, PR China; State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Minhou, Fujian 350108, PR China.
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Zeng YT, Xu MY, Wang T, Wu SY, Zhang J, Mu SC, Yu J. Ru-decorated cobalt-iron oxide nanosheet arrays derived from MOF and LDH double-precursors for overall water splitting in alkali and seawater. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Transition metal tungstates AWO4 (A2+ = Fe, Co, Ni, and Cu) thin films and their photoelectrochemical behavior as photoanode for photocatalytic applications. J APPL ELECTROCHEM 2023. [DOI: 10.1007/s10800-023-01851-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Liu Y, Chen L, Zhu X, Qiu H, Wang K, Li W, Cao S, Zhang T, Cai Y, Wu Q, Li J. Effects of operating temperature on photoelectrochemical performance of CuWO4 film photoanode. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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