Boosted Photoelectrochemical Seawater Splitting by CoOOH-Modified Ti-Fe2O3/In2O3 by Synergy of Electronic Modulation and Heterojunction Construction
In order to address the current energy and environmental challenges, photoelectrochemical (PEC) water splitting has been widely studied, and the key point about the efficient PEC process is how to develop highly active photoanode catalysts. In this article, we report a two-step hydrothermal and electrodeposition approach to prepare a cobalt (oxy)hydroxide (CoOOH)-modified Ti-Fe2O3-In2O3 electrode by synergy of electron modulation and a heterojunction structure for promoting PEC water splitting. Under a bias of 1.23 V vs RHE, the optimized Ti-Fe2O3-In2O3/CoOOH photoanode demonstrated remarkable photocurrent density and hydrogen evolution rate as high as 1.33 mA cm–2 and 22.8 μmol cm–2 h–1, which was 5.11-fold and 5.14-fold that of bare α-Fe2O3, respectively. Characterization results indicate that Ti-doping will alter the electronic structure and improve the charge carrier density, whereas the construction of a heterojunction can realize the spatial separation of charge carriers. Meanwhile, the outer CoOOH ultrathin layer can provide a large amount of oxygen evolution reaction sites and promote the surface reaction. This work suggests that the PEC performance of Fe2O3-based photoanodes can be improved effectively by the synergy of electronic modulation and heterojunction construction.
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