Enhanced BiVO4 Photoanode Photoelectrochemical Performance via Borate Treatment and a NiFeOx Cocatalyst

To settle the slow water oxidation kinetics and charge recombination of BiVO4 photoanodes, boron-treated BiVO4 combined with a NiFeOx electrocatalyst (NiFeOx/B/BiVO4) electrode is prepared. The resultant NiFeOx/B/BiVO4 demonstrates a 5.22 mA/cm2 current density at 1.23 V vs RHE under AM 1.5 G illumi...

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Bibliographic Details
Published in:ACS sustainable chemistry & engineering 2021-06, Vol.9 (24), p.8306-8314
Main Authors: Zhang, Jingnan, Huang, Yongchao, Lu, Xinyu, Yang, Jindong, Tong, Yexiang
Format: Article
Language:English
Online Access:Get full text
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Summary:To settle the slow water oxidation kinetics and charge recombination of BiVO4 photoanodes, boron-treated BiVO4 combined with a NiFeOx electrocatalyst (NiFeOx/B/BiVO4) electrode is prepared. The resultant NiFeOx/B/BiVO4 demonstrates a 5.22 mA/cm2 current density at 1.23 V vs RHE under AM 1.5 G illumination without any sacrificial agent. Significantly, the applied bias photon-to-current efficiency of the NiFeOx/B/BiVO4 photoanode reaches 1.96% at 0.7 V vs RHE, which is much higher than that of pristine BiVO4. Such excellent performance can be attributed to the existence of self-adsorbed [B­(OH)4]− ligands and NiFeOx electrocatalysts, enhancing the separation of photoelectron–hole pairs. This work provides a way to construct effective photocatalysts for solar water splitting.
ISSN:2168-0485
2168-0485
DOI:10.1021/acssuschemeng.1c03055