Graphical Abstract
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Water dissociation process is generally regarded as the rate-limiting step for alkaline hydrogen evolution reaction (HER), and severely inhibits the catalytic efficiency of Pt based catalysts. To overcome this problem, the in-situ constructed interfaces of Pt-Co alloy and amorphous cobalt oxide (CoOx) on the carbon powder are designed. The amorphous CoOx at Pt-Co/CoOx interfaces not only provide active sites for water dissociation to facilitate Volmer step, but also produce the strong electronic transfer with Pt-Co. Accordingly, the obtained interfacial catalysts exhibit outstanding alkaline HER performance with a Tafel slope of 29.3 mV·dec−1 and an ultralow overpotential of only 28 mV at 10 mA·cm−2. Density functional theory (DFT) reveals that the electronic accumulation on the interfacial Co atom in Pt-Co/CoOx constructing the novel active site for water dissociation. Compared to the Pt-Co, all of the energy barriers for water adsorption, water dissociation and hydrogen adsorption/desorption are reduced in Pt-Co/CoOx interfaces, suggesting a boosted HER kinetics for alkaline HER.
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