磷化物
塔菲尔方程
过电位
催化作用
镍
密度泛函理论
材料科学
过渡金属
吉布斯自由能
化学工程
氢
制氢
无机化学
化学
物理化学
电化学
计算化学
冶金
热力学
有机化学
物理
电极
工程类
作者
Caixia Yang,Zhiqiang Wang,Zhendong Li,Yichen Pan,Linwei Jiang,Caicai Li,Chao Wang,Jiayi Zhang
出处
期刊:Chemsuschem
[Wiley]
日期:2022-07-07
卷期号:15 (16)
被引量:2
标识
DOI:10.1002/cssc.202200072
摘要
Nickel phosphide (Ni2 P) has emerged as a promising candidate to substitute Pt-based catalysts for hydrogen evolution reaction (HER) due to the hydrogenase-like catalytic mechanism and concomitantly low cost. However, its catalytic activity is still not comparable to that of noble-metal-based catalysts, and innovative strategies are still urgently needed to further improve its performance. Herein, a self-supported N-doped Ni2 P on Ni foam (N-Ni2 P/NF) was rationally designed and fabricated through a facile NH4 H2 PO2 -assisted gas-solid reaction process. As an HER catalyst in alkaline medium, the obtained N-Ni2 P/NF revealed excellent electrocatalytic performance with a distinctly low overpotential of 50 mV at 10 mA cm-2 , a small Tafel slope of 45 mV dec-1 , and long-term stability for 25 h. In addition, the spectroscopic characterizations and density functional theory calculations confirmed that the incorporation of N regulated the original electronic structure of Ni2 P, enhanced its intrinsic catalytic property, optimized the Gibbs free energy of reaction intermediates, and ultimately promoted the HER process. This work provides an atomic-level insight into the electronic structure modulation of metal phosphides and opens an avenue for developing advanced transition metal phosphides-based catalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI