ACS Catalysis
·
2022
·
IF 13.7
Boyang Zhang,Kaiwei Liu,Yao Xiang,Jiaming Wang,Wenrui Lin,Mei Guo,Guijun Ma
Photo-electrochemical (PEC) and photocatalytic (PC) water splitting are promising solutions to achieve solar-powered hydrogen production. In the present work, to integrate the merits of PEC and PC techniques, a p–n conjugated two-electrode water-splitting system was miniaturized into one particle (denoted as electrode particle) for PC reactions. Specifically, a p-type Rh-doped strontium titanate (Rh:SrTiO3) photocathode material was selectively deposited on the electron-accumulated facet of a particulate n-type Mo-doped bismuth vanadate (Mo:BiVO4) photoanode with inserting a partly oxidized In@InOx interlayer as a grain binder and charge conductor. The photoexcited charge migration and accumulation were visualized through light-assisted Kelvin probe force microscopy. Benefited from efficient interfacial charge transfer and effective surface modification, visible light-driven PC overall water splitting into H2 and O2 was achieved over the prepared Mo:BiVO4/In@InOx/Rh:SrTiO3 electrode particle with an intense-light stability up to 40 h, an ambient pressure endurability from 5 to 95 kPa, and a solar-to-hydrogen energy conversion efficiency of 1.2 × 10–2%. This work develops a strategy of designing an efficient composite photocatalyst for PC overall water splitting and provides insights toward the enhancement of charge transfer efficiency across hetero-semiconductors.
研究领域:
材料科学
·
光化学
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
Solar RRL
·
2024
·
IF 6
Xiya Zhao,Zhiyu Li,Xiaochao Zhang,Xiushuai Guan,Changming Zhang,Puqian Tian,Huiqiang Yue,Liyuan Wang,Yadong Bai,Yawen Wang,Song Yang,Caimei Fan
Photo-anode-driven photoelectrocatalytic reduction of CO 2 is an ideal way for solving problems such as the greenhouse effect and environmental crisis. In this study, a one-step hydrothermal method was successfully used for the preparation of BiVO 4 films doped with different mass fractions of Mo. The results show that when Mo was doped at 1.5 wt%, photocurrent densities of up to 4.11 mA·cm -2 were obtained, 3.36 times greater than those of undoped BiVO 4 , and there was a marked cathodic shifting of water oxidation reaction initiation potential. Subsequently, coupling it with the BiOBr nanosheet cathode, the generated CH 3 OH rate reached 45.67 μmol·L -1 ·h -1 ·cm -2 at a low applied voltage of 1.2 V RHE , with a Faraday efficiency of 60.68% for photoelectrocatalytic CO 2 reduction. This work is important for Bi-based thin film self-assembly coupled with photoelectrocatalytic CO 2 systems. This article is protected by copyright. All rights reserved.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Fuhao Liu,Zhiguo Yuan,Sen Zhao,Quande Che,Qian Ma,Junpeng Wang
Tetragonal BiVO 4 nanorod array exhibits excellent carrier transport properties, but due to its p-type conductivity, it can only be used as a photocathode. In this study, an n-type tetragonal BiVO 4 nanorod array doped with molybdenum was successfully fabricated on fluorine-doped tin oxide (FTO) glass substrates via the hydrothermal method. The doping of Mo and its corresponding concentration were accurately ascertained through X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma (ICP) techniques. Computational simulations revealed that Mo doping induces a shallow donor level beneath the conduction band of BiVO 4 . Notably, the structure and morphology of BiVO 4 did not undergo significant changes after Mo doping, but the conductivity type and conductivity of the surface samples were greatly improved as evidenced by Mott-Schottky and conductive atomic force microscopy (C-AFM) measurements. Impressively, the onset potential for oxygen production when utilized as a photoanode was merely 0.2 V vs RHE. More importantly, although its conduction band position is slightly lower than the hydrogen production potential, the doped sample still demonstrated outstanding activity in water splitting for hydrogen generation.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Bingyan Zhang,Xiaofan Zhang,Xin Xiao,Yan Shen
Fast charge transfer kinetics at the photoelectrode/electrolyte interface is critical for efficient photoelectrochemical (PEC) water splitting system. Thus, far, a measurement of kinetics constants for such processes is limited. In this study, scanning electrochemical microscopy (SECM) is employed to investigate the charge transfer kinetics at the photoelectrode/electrolyte interface in the feedback mode in order to simulate the oxygen evolution process in PEC system. The popular photocatalysts BiVO4 and Mo doped BiVO4 (labeled as Mo:BiVO4) are selected as photoanodes and the common redox couple [Fe(CN)6]3–/[Fe(CN)6]4– as molecular probe. SECM characterization can directly reveal the surface catalytic reaction kinetics constant of 9.30 × 107 mol–1 cm3 s–1 for the BiVO4. Furthermore, we find that after excitation, the ratio of rate constant for photogenerated hole to electron via Mo:BiVO4 reacting with mediator at the electrode/electrolyte interface is about 30 times larger than that of BiVO4. This suggests that introduction of Mo6+ ion into BiVO4 can possibly facilitate solar to oxygen evolution (hole involved process) and suppress the interfacial back reaction (electron involved process) at photoanode/electrolyte interface. Therefore, the SECM measurement allows us to make a comprehensive analysis of interfacial charge transfer kinetics in PEC system.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2025
·Vol. 15
·期 9
·1027
·
IF 2.8
Minglei Yang,Zhenhong Xu,Chongjun Tang,Shuaijie Wang,Zhourong Xiao,Fei Ye
This research introduces a synergistic photoelectrocatalytic (PEC) system designed for the effective degradation of tetracycline (TC), integrating a PO43−-grafted Mo-doped BiVO4(PO43−-Mo:BiVO4) photoanode with a Pd-loaded ordered mesoporous carbon (Pd/CMK-3) cathode. The incorporation of Mo doping and PO43−modification significantly improved the photoanode’s charge separation efficiency, achieving a photocurrent density of 2.9 mA cm−2, and fine-tuned its band structure to enhance hydroxyl radical (·OH) generation. Meanwhile, the Pd/CMK-3 cathode promoted a two-electron oxygen reduction reaction pathway, producing hydrogen peroxide (H2O2) and facilitating molecular oxygen activation via atomic hydrogen (H*) intermediates. Under optimized conditions—1.0 V vs. Ag/AgCl of anodic potential, pH 6.58, and oxygen saturation—the combined system accomplished 80% TC degradation within 60 min, markedly surpassing the performance of the photoanode (72%) or cathode (71%) alone. Notably, this synergistic approach also reduced energy consumption to 0.0065 kWh m−3, outperforming individual components. Radical quenching experiments and liquid chromatography–mass spectrometry (LC-MS) analysis revealed that the photogenerated holes (h+) and ·OH were the key reactive species responsible for TC mineralization. The system demonstrated remarkable stability, with only a 2.96% decline in activity, and effectively degraded other contaminants, such as phenol, 4-chlorophenol, and ciprofloxacin. This study highlights an energy-efficient PEC strategy that harnesses the combined strengths of anodic oxidation and cathodic molecular oxygen activation to significantly enhance the removal of organic pollutants.
研究领域:
环境化学
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材料科学
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催化化学
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水处理技术
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功能材料
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电化学
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光催化
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污染物降解
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）