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- Title
Organic ligand nanoarchitectonics for BiVO<sub>4</sub> photoanodes surface passivation and cocatalyst grafting.
- Authors
Lin, Jingyi; Li, Xin; Wang, Zhiliang; Liu, Runlu; Pan, Hui; Zhao, Yixin; Kong, Lingti; Li, Yao; Zhu, Shenmin; Wang, Lianzhou
- Abstract
Bismuth vanadate (BiVO4) is a promising photoanode material for efficient photoelectrochemical (PEC) water splitting, whereas its performance is inhibited by detrimental surface states. To solve the problem, herein, a low-cost organic molecule 1,3,5-benzenetricarboxylic acid (BTC) is selected for surface passivation of BiVO4 photoanodes (BVOs), which also provides bonding sites for Co2+ to anchor, resulting in a Co-BTC-BVO photoanode. Owing to its strong coordination with metal ions, BTC not only passivates surface states of BVO, but also provides bonding between BVO and catalytic active sites (Co2+) to form a molecular cocatalyst. Computational study and interfacial charge kinetic investigation reveal that chemical bonding formed at the interface greatly suppresses charge recombination and accelerates charge transfer. The obtained Co-BTC-BVO photoanode exhibits a photocurrent density of 4.82 mA/cm2 at 1.23 V vs. reversible hydrogen electrode (RHE) and a low onset potential of 0.22 VRHE under AM 1.5 G illumination, which ranks among the best photoanodes coupled with Co-based cocatalysts. This work presents a novel selection of passivation layers and emphasizes the significance of interfacial chemical bonding for the construction of efficient photoanodes.
- Subjects
SURFACE passivation; PHOTOELECTROCHEMISTRY; PHOTOELECTROCHEMICAL cells; CHEMICAL bonds; STANDARD hydrogen electrode; SURFACE states; INTERFACIAL bonding
- Publication
Nano Research, 2024, Vol 17, Issue 5, p3667
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-023-6262-1