Issue 44, 2024

Constructing FeCoNi-LDH/MOF heterostructures as cocatalysts on hematite photoanodes for high efficiency water splitting

Abstract

Insufficient surface dynamics and severe carrier recombination limit the photoelectrochemical water splitting (PEC-WS) performance of hematite (α-Fe2O3) photoanodes. The surface/interface engineering as an effective method can improve the above-mentioned problems. In this study, the ZIF-67 and FeCoNi-LDH as cocatalysts formed via in situ hydrolysis are successfully introduced on the surface of the α-Fe2O3 photoanode to improve the photogenerated carrier transport. The Sn@α-Fe2O3/ZIF-67/FeCoNi-LDH photoanode exhibits an excellent photocurrent density of 1.72 mA cm−2 at 1.23 VRHE, which is 1.7 times that of the original α-Fe2O3 photoanode. The detailed studies demonstrate that the introduced ZIF-67/FeCoNi-LDH heterojunction cocatalyst provides more abundant surface active sites and defects and enhances the light absorbance ability and electric conductivity. The synergistic effect between ZIF-67 and FeCoNi-LDH cocatalysts can significantly enhance photogenerated carrier separation and transfer efficiency.

Graphical abstract: Constructing FeCoNi-LDH/MOF heterostructures as cocatalysts on hematite photoanodes for high efficiency water splitting

Supplementary files

Article information

Article type
Paper
Submitted
15 Aug 2024
Accepted
16 Oct 2024
First published
17 Oct 2024

New J. Chem., 2024,48, 18700-18708

Constructing FeCoNi-LDH/MOF heterostructures as cocatalysts on hematite photoanodes for high efficiency water splitting

Q. Gao, B. Yuhan, P. Song, Q. Dong, J. Luo, S. Zhao, X. Tian, X. Xing and J. Du, New J. Chem., 2024, 48, 18700 DOI: 10.1039/D4NJ03619K

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