The electrochemical oxygen reduction reaction (ORR) is regarded as an attractive alternative to the anthraquinone process for sustainable and on-site hydrogen peroxide (H 2 O 2 ) 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 oxygendeficient TiO 2−x layer. The resulting a-TiO 2−x /TiC exhibits a low overpotential and high H 2 O 2 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 g cat.−1 h −1 at 0.30 V vs RHE. The electrocatalytic mechanism of a-TiO 2−x / TiC is further revealed by density functional theory calculations.

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Cost-effective and durable electrocatalysts for alkaline hydrogen evolution reaction (HER) are urgently pursued. The slow HER kinetics suppressed by water dissociation hinder the application of catalysts in alkaline media. Herein,...

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