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Charge Transport Enhancement in BiVO 4 Photoanode for Efficient Solar Water Oxidation.

Authors :
Li, Zhidong
Xie, Zhibin
Li, Weibang
Aziz, Hafiz Sartaj
Abbas, Muhammad
Zheng, Zhuanghao
Su, Zhenghua
Fan, Ping
Chen, Shuo
Liang, Guangxing
Source :
Materials (1996-1944); May2023, Vol. 16 Issue 9, p3414, 11p
Publication Year :
2023

Abstract

Photoelectrochemical (PEC) water splitting in a pH-neutral electrolyte has attracted more and more attention in the field of sustainable energy. Bismuth vanadate (BiVO<subscript>4</subscript>) is a highly promising photoanode material for PEC water splitting. Additionally, cobaltous phosphate (CoPi) is a material that can be synthesized from Earth's rich materials and operates stably in pH-neutral conditions. Herein, we propose a strategy to enhance the charge transport ability and improve PEC performance by electrodepositing the in situ synthesis of a CoPi layer on the BiVO<subscript>4</subscript>. With the CoPi co-catalyst, the water oxidation reaction can be accelerated and charge recombination centers are effectively passivated on BiVO<subscript>4</subscript>. The BiVO<subscript>4</subscript>/CoPi photoanode shows a significantly enhanced photocurrent density (J<subscript>ph</subscript>) and applied bias photon-to-current efficiency (ABPE), which are 1.8 and 3.2 times higher than those of a single BiVO<subscript>4</subscript> layer, respectively. Finally, the FTO/BiVO<subscript>4</subscript>/CoPi photoanode displays a photocurrent density of 1.39 mA cm<superscript>−2</superscript> at 1.23 V<subscript>RHE</subscript>, an onset potential (V<subscript>on</subscript>) of 0.30 V<subscript>RHE</subscript>, and an ABPE of 0.45%, paving a potential path for future hydrogen evolution by solar-driven water splitting. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
19961944
Volume :
16
Issue :
9
Database :
Complementary Index
Journal :
Materials (1996-1944)
Publication Type :
Academic Journal
Accession number :
163687169
Full Text :
https://doi.org/10.3390/ma16093414