过电位
分解水
电解水
塔菲尔方程
镍
材料科学
析氧
掺杂剂
无机化学
过渡金属
硫化镍
电解
电化学
化学工程
碱性水电解
化学
兴奋剂
纳米技术
催化作用
电解质
冶金
物理化学
电极
光电子学
生物化学
工程类
光催化
作者
Khang Ngoc Dinh,Yongxiu Sun,Zengxia Pei,Zhangfu Yuan,Ady Suwardi,Qianwei Huang,Xiaozhou Liao,Zhiguo Wang,Yuan Chen,Qingyu Yan
出处
期刊:Small
[Wiley]
日期:2020-04-01
卷期号:16 (17)
被引量:56
标识
DOI:10.1002/smll.201905885
摘要
Developing highly efficient earth-abundant nickel-based compounds is an important step to realize hydrogen generation from water. Herein, the electronic modulation of the semiconducting NiS2 by cation doping for advanced water electrolysis is reported. Both theoretical calculations and temperature-dependent resistivity measurements indicate the semiconductor-to-conductor transition of NiS2 after Cu incorporation. Further calculations also suggest the advantages of Cu dopant to cathodic water electrolysis by bringing Gibbs free energy of H adsorption at both Ni sites and S sites much closer to zero. It is noteworthy that water dissociation on Cu-doped NiS2 (Cu-NiS2 ) surface is even more favorable than those on NiS2 and Pt(111). Thus, the prepared Cu-NiS2 shows noticeably improved performance toward alkaline hydrogen and oxygen evolution reactions (HER and OER). Specifically, it requires merely 232 mV OER overpotential to drive 10 mA cm-2 ; in parallel with Tafel slopes of 46 mV dec-1 . Regarding HER, an onset overpotential of only 68 mV is achieved. When integrated as both electrodes for water electrolysis, Cu-NiS2 needs only 1.64 V to drive 10 mA cm-2 , surpassing the state-of-the-art Ir/C-Pt/C couple (1.71 V). This work opens up an avenue to engineer low-cost and earth-abundant catalysts performing on par with the noble-metal-based one for water splitting.
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