期刊
ADVANCED SUSTAINABLE SYSTEMS
卷 6, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsu.202200014
关键词
bismuth vanadate; interface engineering; oxygen evolution reaction; photoelectrochemical water splitting
资金
- Korea Basic Science Institute (National Research Facilities and Equipment Center) - Ministry of Education, Republic of Korea [2019R1A6C1010024, 2019R1A6C1030006]
- National Research Foundation of Korea [2019R1A6C1010024, 2019R1A6C1030006] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigates the interface-engineered monoclinic bismuth vanadate photoanodes, which improve charge carrier transport and significantly enhance the performance of photoelectrochemical water splitting.
Monoclinic bismuth vanadate photoanodes promise high efficiency-to-cost ratios for photoelectrochemical (PEC) water splitting owing to their suitable band structure and ease of synthesis. However, inadequate charge separation and sluggish oxidation kinetics remain a fundamental challenge. This study investigates bifacially interface engineered BiVO4 photoanodes by considering a seed-layer and NiOOH oxygen evolution catalyst (OEC) over-layer to regulate the charge carrier transport and improve the overall PEC water-splitting performance. The modification of the BiVO4/FTO interface stimulates electron flow towards fluorine-doped tin oxide (FTO) and a NiOOH over-layer improves the facile hole transfer from BiVO4 to the electrolyte. Compared to the moderate photocurrent density of a bare BiVO4 photoanode (1.5 mA cm(-2)), the interface-engineered Seed_BiVO4_NiOOH photoanode shows a remarkably high (approximate to 3.4 times higher) photocurrent density of 5.10 mA cm(-2) at 1.23 V vs reversible hydrogen electrode with impressive long-term stability over 9 h under illumination. The optimally interface engineered Seed_BiVO4_NiOOH photoanode shows an excellent photoconversion efficiency (1.83%), with significant improvement in bulk charge separation efficiency. This work presents a promising strategy for the development of a highly stable PEC water-splitting device and eliminates the intrinsic material shortcomings of the bare BiVO4 photoanode by modulating the carrier transport via bifacial interface engineering.
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