Li Yongsheng, Li Zhen, Xu Chengwen, Yu Shuangwei, Sun Zijun
China Academy of Science & Technology Development GuangXi Branch Nanning 530001 China.
School of Automation, Guangxi University of Science and Technology Liuzhou 545006 China.
RSC Adv. 2023 Mar 14;13(12):8374-8382. doi: 10.1039/d3ra00346a. eCollection 2023 Mar 8.
The photoelectrochemical (PEC) water splitting performance of BiVO (BVO), a promising photoanode material, is constrained by its extremely short hole diffusion length and slow water oxidation kinetics. Modification of oxygen evolution cocatalysts (OECs) by appropriate methods is a practical solution to enhance the PEC water splitting performance of BVO. In this work, two different nickel phosphides NiP and NiP were prepared by a facile and mild one-step solvothermal method, and used as OECs to modify a BVO photoanode for enhancing the PEC water splitting performance. The BVO/NiP and BVO/NiP photoanodes showed impressive photocurrent densities of 3.3 mA cm and 3.1 mA cm, respectively. In addition, the PEC water splitting stability of the BVO/NiP photoanode was greatly enhanced compared to that of the bare BVO photoanode. Further characterization and photoelectrochemical analysis revealed that the significant improvement of the BVO photoanode performance was attributed to the effective inhibition of surface charge recombination, facilitation of interfacial charge transfer, and acceleration of water oxidation kinetics after NiP and NiP modification.
BiVO（BVO）作为一种很有前景的光阳极材料，其光电化学（PEC）水分解性能受到极短的空穴扩散长度和缓慢的水氧化动力学的限制。通过适当方法对析氧共催化剂（OECs）进行改性是提高BVO的PEC水分解性能的切实可行的解决方案。在这项工作中，通过简便温和的一步溶剂热法制备了两种不同的磷化镍NiP和NiP，并用作OECs来改性BVO光阳极以提高PEC水分解性能。BVO/NiP和BVO/NiP光阳极分别显示出令人印象深刻的光电流密度3.3 mA cm和3.1 mA cm。此外，与裸BVO光阳极相比，BVO/NiP光阳极的PEC水分解稳定性大大提高。进一步的表征和光电化学分析表明，BVO光阳极性能的显著改善归因于NiP和NiP改性后表面电荷复合的有效抑制、界面电荷转移的促进以及水氧化动力学的加速。
