材料科学
电催化剂
铂金
碳化物
非金属
密度泛函理论
氢
吸附
化学物理
化学工程
金属
无机化学
纳米技术
电化学
冶金
计算化学
催化作用
物理化学
电极
有机化学
化学
工程类
作者
Xinwen Liang,Chi‐Man Lawrence Wu
出处
期刊:Nano Energy
[Elsevier]
日期:2020-05-01
卷期号:71: 104603-104603
被引量:56
标识
DOI:10.1016/j.nanoen.2020.104603
摘要
The development of effective metal-free electrocatalytic for hydrogen evolution reaction (HER) to substitute precious Pt based catalyst has attracted massive research interests. Herein, we report a density functional theory (DFT) investigation on activation and optimization of a new metal-free two-dimensional (2D) material, namely, phosphorus carbide (β-PC) monolayer as efficient HER electrocatalysts by applying reasonable C-vacancies and strain. Our theoretical results show that the C-vacancies introduce in-gap states, thus significantly increase the electrical conductance and hydrogen binding strength, which are favorable for HER process. The hydrogen adsorption free energies (ΔGH) can be effectively controlled by strain and C-vacancies concentration. Appropriate combinations of strain and C-vacancies concentration can achieve optimal conditions of ΔGH ≈ 0 and excellent exchange current density, suggesting a superior catalytic activity comparable to Pt. Moreover, the physico-chemical origin of defect and strain on nonmetal-H bonding were rationalized by establishing a linear relationship between hydrogen adsorption strength and the intrinsic electronic structure of β-PC. Our work offers a new promising metal-free catalyst for HER and reveals profound insights into the bonding mechanisms of nonmetal-H bond to guide the atomic design of more efficient metal-free electrocatalysts.
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