过电位
塔菲尔方程
离解(化学)
吸附
动力学
催化作用
氢
材料科学
化学
氢原子
化学工程
化学物理
无机化学
光化学
物理化学
有机化学
电化学
电极
物理
烷基
量子力学
工程类
作者
Jiang Zhu,Liwei An,Xiangyang Li,Kevin Iputera,Ru−Shi Liu,Jinlong Yang,Deli Wang,Xu Zhao
标识
DOI:10.1016/j.apsusc.2023.158809
摘要
Developing efficient catalysts with accelerated kinetics towards alkaline hydrogen evolution reaction (HER) is of vital importance but still challenging owing to the sluggish processes, including water adsorption, water dissociation, and hydrogen adsorption. Herein, we presented a facile strategy to anchor isolated Pd atoms on Ti3C2Tx MXene (Pd1-Ti3C2Tx) to simultaneously regulate the adsorption of intermediates for accelerated HER kinetics under alkaline conditions. Mechanism studies suggested that Pd1-Ti3C2Tx could effectively strengthen the H2O adsorption and dissociation owing to the strong electron interaction between O 2p orbital in H2O and Pd 3d orbital in Pd1-Ti3C2Tx. Meanwhile, the hydrogen adsorption on Ti3C2Tx MXene could be further optimized due to the downshifted p-band center of surface O sites caused by the anchoring of Pd atoms. Accordingly, Pd1-Ti3C2Tx showed a much lower overpotential and smaller Tafel slope in comparison with that of pure Ti3C2Tx. This work provides a fundamental understanding of designing electrocatalysts with regulated kinetics through the single-atom-modulation strategy.
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