过电位
塔菲尔方程
交换电流密度
材料科学
钴
镍
电解质
三元运算
氢
分解水
固溶体
化学工程
无机化学
硒化物
制氢
物理化学
电极
催化作用
电化学
化学
冶金
光催化
有机化学
生物化学
程序设计语言
计算机科学
硒
工程类
作者
Chuan Xia,Hanfeng Liang,Jiajie Zhu,Udo Schwingenschlögl,Husam N. Alshareef
标识
DOI:10.1002/aenm.201602089
摘要
An effective multifaceted strategy is demonstrated to increase active edge site concentration in Ni 0.33 Co 0.67 Se 2 solid solutions prepared by in situ selenization process of nickel cobalt precursor. The simultaneous control of surface, phase, and morphology result in as‐prepared ternary solid solution with extremely high electrochemically active surface area ( C dl = 197 mF cm −2 ), suggesting significant exposure of active sites in this ternary compound. Coupled with metallic‐like electrical conductivity and lower free energy for atomic hydrogen adsorption in Ni 0.33 Co 0.67 Se 2 , identified by temperature‐dependent conductivities and density functional theory calculations, the authors have achieved unprecedented fast hydrogen evolution kinetics, approaching that of Pt. Specifically, the Ni 0.33 Co 0.67 Se 2 solid solutions show a low overpotential of 65 mV at −10 mV cm −2 , with onset potential of mere 18 mV, an impressive small Tafel slope of 35 mV dec −1 , and a large exchange current density of 184 µA cm −2 in acidic electrolyte. Further, it is shown that the as‐prepared Ni 0.33 Co 0.67 Se 2 solid solution not only works very well in acidic electrolyte but also delivers exceptional hydrogen evolution reaction (HER) performance in alkaline media. The outstanding HER performance makes this solid solution a promising candidate for mass hydrogen production.
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