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Tunable surface modification of a hematite photoanode by a Co(salen)-based cocatalyst for boosting photoelectrochemical performance

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Abstract

In this work, a water splitting photoanode composed of hematite (α-Fe2O3) nanorods was modified with a Co(salen)-based cocatalyst, which was proven to exhibit special photoelectrochemical (PEC) oxygen evolution activity. Co(salen) was deposited on the surface of the α-Fe2O3 photoanode as a precursor of the cocatalyst and then heat-treated at different temperatures. When the annealing temperature is 250 °C, Co(salen) transforms into Co3+ species stabilized with C–N ligands, which act as active sites and decrease the OER energy barrier for the photoelectrochemical process of the α-Fe2O3 photoanode. Meanwhile, the interaction between Co–C–N and Fe (Co–C–N⋯Fe) via van der Waals force can provide a photocarrier transfer pathway to achieve a 1.7 fold higher photocurrent at 1.23 V vs. RHE and 180 mV onset potential negative shift compared to those of the pure α-Fe2O3 photoanode. This work demonstrates a unique surface structure of a cocatalyst created by a post synthetic strategy using a metal complex precursor containing organic ligands.

Graphical abstract: Tunable surface modification of a hematite photoanode by a Co(salen)-based cocatalyst for boosting photoelectrochemical performance

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Article information


Submitted
07 Dec 2019
Accepted
05 Feb 2020
First published
05 Feb 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

Tunable surface modification of a hematite photoanode by a Co(salen)-based cocatalyst for boosting photoelectrochemical performance

R. Wang, Y. Kuwahara, K. Mori, Y. Bu and H. Yamashita, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/C9CY02481F

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