Nitrogen-incorporation activates NiFeOx catalysts for efficiently boosting oxygen evolution activity and stability of BiVO4 photoanodes

Beibei Zhang, Shiqiang Yu, Ying Dai, Xiaojuan Huang, Lingjun Chou (), Gongxuan Lu (), Guojun Dong and Yingpu Bi ()
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Beibei Zhang: Lanzhou Institute of Chemical Physics, CAS
Shiqiang Yu: Shandong University
Ying Dai: Shandong University
Xiaojuan Huang: Lanzhou Institute of Chemical Physics, CAS
Lingjun Chou: Lanzhou Institute of Chemical Physics, CAS
Gongxuan Lu: Lanzhou Institute of Chemical Physics, CAS
Guojun Dong: Lanzhou Institute of Chemical Physics, CAS
Yingpu Bi: Lanzhou Institute of Chemical Physics, CAS

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Developing low-cost and highly efficient catalysts toward the efficient oxygen evolution reaction (OER) is highly desirable for photoelectrochemical (PEC) water splitting. Herein, we demonstrated that N-incorporation could efficiently activate NiFeOx catalysts for significantly enhancing the oxygen evolution activity and stability of BiVO4 photoanodes, and the photocurrent density has been achieved up to 6.4 mA cm−2 at 1.23 V (vs. reversible hydrogen electrode (RHE), AM 1.5 G). Systematic studies indicate that the partial substitution of O sites in NiFeOx catalysts by low electronegative N atoms enriched the electron densities in both Fe and Ni sites. The electron-enriched Ni sites conversely donated electrons to V sites of BiVO4 for restraining V5+ dissolution and improving the PEC stability, while the enhanced hole-attracting ability of Fe sites significantly promotes the oxygen-evolution activity. This work provides a promising strategy for optimizing OER catalysts to construct highly efficient and stable PEC water splitting devices.

Date: 2021
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DOI: 10.1038/s41467-021-27299-0

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