Preparation of heterometallic CoNi-MOFs-modified BiVO4: a steady photoanode for improved performance in photoelectrochemical water splitting

By Shi-Xiong Zhou, Kaiyi Chen, Jingwei Huang, Lei Wang, Mingyi Zhang, B. Bai, Hui Liu, Qizhao Wang. 2020

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Abstract In this work, an efficient nanoporous BiVO4 composite photoelectrode with high photocurrent and low onset potential for photoelectrochemical water splitting is achieved through modification of BiVO4 with a stable heterometallic CoNi-MOF layer. Compared with pristine BiVO4 anode, the formation of CoNi-MOFs/BiVO4 increases the photocurrent density by about 260 %. In addition, the CoNi-MOFs/BiVO4 photoanode is of greater steadiness for water oxidation, without insignificant activity attenuation within 3 reaction hours at 1.23 V vs. RHE. It is postulated that bimetal-organic framework CoNi-MOFs could supply more open sites which account for the impressively enhanced PEC performance of BiVO4 photoanodes toward water splitting under illumination. The results demonstrate a new method to fabricate dual metal nanoparallelepiped-like MOF for steady hydrolysis photoanode material.

Subfields: Inorganic Chemistry, Materials Chemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/8141674d9f5f3d05a70977111aa18dedc27569f8