Abstract
Despite being a promising photoanode material for water splitting, WO3 has low conductivity, high onset potential, and sluggish water oxidation kinetics. In this study, we designed Ti-doped WO3 nanoplate arrays on fluoride-doped tin oxide by a seed-free hydrothermal method, and the effects of doping on the photoelectrochemical performance were investigated. The optimal Ti-doped WO3 electrode achieved a photocurrent density of 0.53 mA/cm2 at 0.6 V (vs Ag/AgCl), 110% higher than that of pure WO3 nanoplate arrays. Moreover, a significant cathodic shift in the onset potential was observed after doping. X-ray photoelectron spectroscopy valence band and ultraviolet — visible spectra revealed that the band positions of Ti-doped WO3 photoanodes moved upward, yielding a lower onset potential. Furthermore, electrochemical impedance spectroscopy measurements revealed that the conductivities of the WO3 photoanodes improved after doping, because of the rapid separation of photo-generated charge carriers. Thus, we report a new design route toward efficient and low-cost photoanodes for photoelectrochemical applications.
摘要
氧化钨(WO3)是一种重要的光电化学分解水半导体,具有可见光响应好、无毒、稳定性好等优 点,但低的电导率、高的起始电位以及缓慢的水氧化动力学等缺点也限制了其进一步应用。本文采用 无晶种水热法在导电玻璃(FTO)上设计了一种钛掺杂的WO3纳米片阵列,并研究了Ti 掺杂浓度对光电 化学分解水性能的影响。结果表明,在0.6 V(vs Ag/AgCl)的偏压下,Ti 掺杂WO3光电流密度最高,可 达0.53 mA/cm2,比纯WO3纳米片阵列的高110%。同时,Ti 掺杂WO3光电极的起始电位负移。X射线 光电子能谱价带谱(XPS-VB)和紫外-可见吸收(UV-Vis)光谱显示,Ti 掺杂WO3光阳极的能带位置向上移 动,导致了起始电位的负移。此外,电化学阻抗谱测试(EIS)表明,Ti 掺杂WO3光阳极的导电性显著增 强,引起光生载流子的快速分离。研究成果有望提供一种高效、低成本光阳极的设计路线。
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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TANG Ya-qin conducted partial experiments, performed data analysis and edited the draft of the manuscript. JIANG Di, WANG Huan, ZHENG Hong-ye, REN Lu-jun conducted partial experiments. ZHANG Xue-liang provided the concept, conducted partial experiments and wrote the first draft of the manuscript. WEI Kui-xian, MA Wen-hui, LUO Da-jun and LIU Yi-ke performed data analysis and conducted the literature review.
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The authors declare that they have no known competing financial interests or personal relationship that could have appeared to influence the work reported in this paper.
Foundation item: Project(Qian Jiao He KY Zi [2021]257) supported provided by the Natural Science Research Project of Education Department of Guizhou Province, China; Project(GZSQCC2019003) supported by the High-level Innovative Talent Cultivation Project of Guizhou Province, China; Projects(GZLGXM-01, GZLGXM-08) supported by the Academic New Seedling Cultivation and Innovation Exploration Project of Guizhou Institute of Technology, China
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Tang, Yq., Jiang, D., Wang, H. et al. Band gap modulation of nanostructured WO3 nanoplate film by Ti doping for enhanced photoelectrochemical performance. J. Cent. South Univ. 29, 2968–2979 (2022). https://doi.org/10.1007/s11771-022-5125-3
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DOI: https://doi.org/10.1007/s11771-022-5125-3