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Cobalt and Sulfur Co-doping Induce Nickel Electron Localization to Enhance Alkaline Hydrogen Evolution Activity by Wei Xu; Jun-Peng Zhang; Shuan Zhao; Xu Yang; Yi-Wen Han; Wen-Jie Yin; Xin Tang; Yu Shen is a Engineering article available to read on EtoBox.

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Developing and synthesizing the economical electrocatalysts for alkaline hydrogen evolution reaction (HER) is essential for the large-scale production of hydrogen source. Although NiCoS-based electrocatalysts have attracted great attention, deep insight into the mechanism of boosted HER activities still needs to be further investigated, especially based on the doped Ni-based electrocatalyst. Herein, we synthesized the cobalt and sulfur co-doped nickel electrocatalysts (NCS) and the HER performance is evaluated in alkaline medium. The results show that the NCS with optimized component has a boosted HER activity compared to Ni, NiCo, and NiS, which exhibits the lower overpotential of 45.8 mV at 10 mA·cm−2 and Tafel slope of 83.4 mV·dec-1. The co-introduced Co and S are conductive to increase the reactive sites, charge transfer capacity and aerophobic property. The theoretical calculation results reveal that the doped S can induce electron localization at the Ni and Co atoms bonded to S atom. Moreover, we also confirm that the Co sites and Ni sites of NCS represent the reactive sites in the Volmer and Heyrovsky steps, respectively, and thereby boosting the hydrogen evolution activity.

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Author

Wei Xu; Jun-Peng Zhang; Shuan Zhao; Xu Yang; Yi-Wen Han; Wen-Jie Yin; Xin Tang; Yu Shen

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)