NiFe-bimetal-organic framework grafting oxygen-vacancy-rich BiVO4 photoanode for highly efficient solar-driven water splitting

Bismuth vanadate (BVO) possesses great potential in photoelectrochemical water splitting application, but still suffers from low charge transfer efficiency as well as poor chemical stability. Herein, we have fabricated a thin NiFe-bimetal-organic framework (NiFe-MOF) layer grafting surface oxygen vacancies enriched BVO photoanode (NiFe-O-vac-BVO), which improves the charge separation and transfer efficiency during oxygen evolution process. Meanwhile, the NiFe-MOFs thin layer can not only protect the surface O-vac of BVO, but also efficiently inhibits the photocorrosion. As a result, the resultant NiFe-O-vac-BVO exhi-bits good chemical stability and achieves an outstanding photocurrent density of 4.42 +/- 0.1 mA.cm?2 at 1.23 V vs reversible hydrogen electrode (RHE), which is 3.7-time higher than that of BVO photoanode. This work supplies an efficient avenue to design photoanode with enhanced photocurrent and stability by using a thin NiFe-MOF layer grafting Ovac-BVO. (C)2022 Elsevier Inc. All rights reserved.

Automated summary

A thin NiFe-MOF layer grafted O-vac-BVO photoanode was fabricated, which improved charge separation and transfer efficiency, and effectively inhibited photocorrosion, resulting in outstanding photocurrent density and chemical stability.