Issue 20, 2022

Vertically aligned Fe2TiO5 nanorods and coupling of NiMoO4/CoMoO4 as a hole-transfer cocatalyst for enhancing photoelectrochemical water oxidation performance

Abstract

Fe2TiO5, a promising photoanode material for photoelectrochemical (PEC) water splitting, is limited by its poor conductivity and short carrier diffusion length. Herein, a novel Fe2TiO5 nanorod photoanode coated with a cocatalyst NiMoO4/CoMoO4 has been designed for efficient PEC water splitting. The Fe2TiO5/NiMoO4/CoMoO4 photoanode shows a photocurrent density of 1.67 mA cm−2 at 1.23 V versus the reversible hydrogen electrode (RHE) under an irradiation of 100 mW cm−2, which is 2.25 times that of Fe2TiO5 nanorods (0.74 mA cm−2) at 1.23 V versus RHE. And the onset potential of Fe2TiO5/NiMoO4/CoMoO4 illustrates a 247 mV cathodic shift from that of the Fe2TiO5 nanorod photoanode. Moreover, Fe2TiO5/NiMoO4/CoMoO4 exhibits excellent stability at 1.23 V versus RHE under 2 h illumination. Further investigation indicates that NiMoO4/CoMoO4 modifies the surface states of Fe2TiO5 nanorods and effectively promotes the reaction kinetics at the semiconductor/electrolyte interface. This work emphasizes that the design of a nanorod structure and the loading of a cocatalyst provide a novel strategy for achieving excellent PEC performance.

Graphical abstract: Vertically aligned Fe2TiO5 nanorods and coupling of NiMoO4/CoMoO4 as a hole-transfer cocatalyst for enhancing photoelectrochemical water oxidation performance

Supplementary files

Article information

Article type
Paper
Submitted
15 Jul 2022
Accepted
16 Aug 2022
First published
16 Aug 2022

Catal. Sci. Technol., 2022,12, 6120-6128

Vertically aligned Fe2TiO5 nanorods and coupling of NiMoO4/CoMoO4 as a hole-transfer cocatalyst for enhancing photoelectrochemical water oxidation performance

B. Ding, H. Li, R. Wang, B. Dong and L. Cao, Catal. Sci. Technol., 2022, 12, 6120 DOI: 10.1039/D2CY01253G

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