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Enhanced Electrochemical H2O2 Production via Two-Electron Oxygen Reduction Enabled by Surface-Derived Amorphous
Zhaoquan Xu1,2, Jie Liang2, Yuanyuan Wang3
1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China.
Abstract:
The electrochemical oxygen reduction reaction (ORR) is regarded as an attractive alternative to the anthraquinone process for sustainable and on-site hydrogen peroxide (H2O2) production. It is however hindered by low selectivity due to strong competition from the four-electron ORR and needs efficient catalysts to drive the 2e- ORR. Here, an acid oxidation strategy is proposed as an effective strategy to boost the 2e- ORR activity of metallic TiC via in-site generation of a surface amorphous oxygen-deficient TiO2- layer. The resulting a-TiO2-/TiC exhibits a low overpotential and high H2O2 selectivity (94.1% at 0.5 V vs reversible hydrogen electrode (RHE)), and it also demonstrates robust stability with a remarkable productivity of 7.19 mol gcat.-1 h-1 at 0.30 V vs RHE. The electrocatalytic mechanism of a-TiO2-/TiC is further revealed by density functional theory calculations.
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