Issue 4, 2022

Type-II BiVO4/Ni3(hexahydroxytriphenylene)2 heterojunction photoanodes for effective photoelectrochemical reaction

Abstract

Semiconducting M3(hexahydroxytriphenylene)2 (M = Ni, Co, Cu; hexahydroxytriphenylene (HHTP)) was uniformly coated onto BiVO4 thin films via a facile solvothermal process, and the photoelectrochemical performance of the BiVO4/M3(HHTP)2 photoanodes was investigated. All three BiVO4/M3(HHTP)2 photoanodes exhibited higher photocurrent densities than pristine BiVO4. This can be attributed to the formation of type-II heterojunctions, as confirmed by ultraviolet photoelectron spectroscopy (UPS) and ultraviolet-visible spectroscopy. BiVO4/Ni3(HHTP)2 exhibited the highest photocurrent density of 4.66 mA cm−2 at 1.23 V vs. a reversible hydrogen electrode (RHE), an approximately 3.2-fold increase from that of pristine BiVO4. The results suggest that the type of metal ion in M3(HHTP)2 affects the electrical conductivity, which significantly influences the charge transport kinetics in the photoelectrochemical reactions of BiVO4. The mechanism underlying the enhanced photoelectrochemical reaction was also investigated.

Graphical abstract: Type-II BiVO4/Ni3(hexahydroxytriphenylene)2 heterojunction photoanodes for effective photoelectrochemical reaction

Supplementary files

Article information

Article type
Paper
Submitted
15 jan 2022
Accepted
08 mar 2022
First published
10 mar 2022
This article is Open Access
Creative Commons BY-NC license

Energy Adv., 2022,1, 197-204

Type-II BiVO4/Ni3(hexahydroxytriphenylene)2 heterojunction photoanodes for effective photoelectrochemical reaction

J. W. Yoon, Y. Jo and J. Lee, Energy Adv., 2022, 1, 197 DOI: 10.1039/D2YA00008C

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