期刊
SMALL
卷 18, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202203471
关键词
amorphous carbide; electrosynthesis; hydrogen evolution reaction; MAX; Pt nanoparticles
类别
资金
- Key Science and Technology Developing Project of Shaanxi Province [2020KWZ-004]
- China Postdoctoral Science Foundation [BX20200266, 2020M673400]
- Natural Science Foundation of Shaanxi Province [2021JQ-059]
- Fundamental Research Funds for the Central Universities [xjh012020041]
This study investigates the electrocatalytic hydrogen evolution reaction (HER) activity of MAX phases and develops highly efficient MAX-derived electrocatalysts through in situ electrosynthesis.
MAX phases are frequently dominated as precursors for the preparation of the star material MXene, but less eye-dazzling by their own potential applications. In this work, the electrocatalytic hydrogen evolution reaction (HER) activity of MAX phase is investigated. The MAX-derived electrocatalysts are prepared by a two-step in situ electrosynthesis process, an electrochemical etching step followed by an electrochemical deposition step. First, a Mo2TiAlC2 MAX phase is electrochemically etched in 0.5 m H2SO4 electrolyte. Just several hours, electrochemical dealloy etching of Mo2TiAlC2 MAX powders by applying anode current can acquire a moderated HER performance, outperforming most of reported pure MXene. It is speculated that in situ superficially architecting endogenous MAX/amorphous carbide (MAC) improves its intrinsic catalytic activity. Subsequently, highly active metallic Pt nanoparticles immobilized on MAC (MAC@Pt) shows a transcendental overpotential of 40 mV versus RHE in 0.5 m H2SO4 and 79 mV in 1.0 m KOH at the current density of 10 mA cm(-2) without iR correction. Ultrahigh mass activity of MAC@Pt (1.5 A mg(pt)(-1)) at 100 mV overpotential is also achieved, 29-folds than those of commercial PtC catalysts.
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