过电位
材料科学
活化能
动力学
密度泛函理论
磷化物
MXenes公司
电化学
氢
分析化学(期刊)
物理化学
纳米技术
化学
计算化学
金属
电极
物理
有机化学
量子力学
色谱法
冶金
作者
Hua‐Jie Niu,Yan Yu,Sisi Jiang,Tong Liu,Tong Sun,Wei Zhou,Lin Guo,Jinghong Li
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-07-07
卷期号:16 (7): 11049-11058
被引量:59
标识
DOI:10.1021/acsnano.2c03711
摘要
Heterointerfaces can adjust the adsorption energy with intermediates in the transition state for a much decreased kinetics energy barrier (Ea). One typical transition metal phosphide, NiCoP grains (∼5 nm in size), was anchored on a Ti3C2Tx MXene monolayer (∼1 nm in thickness) to boost the kinetics toward alkaline hydrogen evolution reaction (HER). General electrochemical experiments at different temperatures give a small Ea of 31.4 kJ mol-1, showing a 22.1% decrease compared to its counterpart NiCoP nanoparticles (40.3 kJ mol-1). Impressively, the overpotential of NiCoP@MXene dramatically decreases from 71 mV to 4 mV at 10 mA cm-2 when the temperature increases from 25 °C to 65 °C. On a single NiCoP@MXene sheet, scanning electrochemical microscopy (SECM) tests also give a very close value of Ea = 31.9 kJ mol-1, with a relative error of ∼1.6%. Density functional theory (DFT) calculations confirm the interface between NiCoP and MXene can effectively decrease the energy barrier of water dissociation by 16.0%. The three kinds of studies on macro, micro/nano, and atomic scales disclose the interfaces can reduce the kinetics energy barrier about 16.0-22.1%. Besides, the photothermal effect of MXenes can easily raise the catalyst temperature under vis-NIR light, which has been applied in practical scenarios under sunlight for energy savings.
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