Chen Meihong, Chang Xiaobo, Li Can, Wang Hongqiang, Jia Lichao
Key Laboratory of Applied Surface and Colloid Chemistry, National Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, 620 West Chang'an Street, Xi'an, Shaanxi 710119, China.
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Labortary of Graphene, Xi'an 710072, PR China.
J Colloid Interface Sci. 2023 Jun 15;640:162-169. doi: 10.1016/j.jcis.2023.02.096. Epub 2023 Feb 21.
BiVO (BVO) based photoanode is one of the most mega-potential materials for solar water splitting while suffers from poor charge transfer and separation efficiency limit its practical application. Herein, FeOOH/Ni-BiVO photoanode synthesized by the facile wet chemical method were investigated for improved charge transport and separation efficiency. The photoelectrochemical (PEC) measurements demonstrate that the water oxidation photocurrent density can reach as high as 3.02 mA cm at 1.23 V vs RHE, and the surface separation efficiency can be boosted to 73.3 %, which increases around 4 times comparing with that of pure sample. Further depth studies showed that the Ni doping can effectively promote hole transport/trapping and introduce more active sites for the oxidation of water, while FeOOH co-catalyst could passivate the Ni-BiVO photoanode surface. This work provides a model for the design of BiVO-based photoanodes with combined thermodynamic and kinetic advantages.
基于BiVO（BVO）的光阳极是太阳能水分解最具潜力的材料之一，但电荷转移和分离效率低下限制了其实际应用。在此，研究了通过简便的湿化学方法合成的FeOOH/Ni-BiVO光阳极，以提高电荷传输和分离效率。光电化学（PEC）测量表明，在相对于可逆氢电极（RHE）为1.23 V时，水氧化光电流密度可高达3.02 mA/cm²，表面分离效率可提高到73.3%，与纯样品相比增加了约4倍。进一步的深入研究表明，Ni掺杂可以有效地促进空穴传输/捕获，并引入更多用于水氧化的活性位点，而FeOOH助催化剂可以钝化Ni-BiVO光阳极表面。这项工作为设计具有热力学和动力学综合优势的BiVO基光阳极提供了一个模型。
