过电位
催化作用
析氧
原子单位
电催化剂
层状双氢氧化物
材料科学
密度泛函理论
分解水
悬空债券
化学工程
纳米技术
电化学
化学
无机化学
物理化学
计算化学
冶金
电极
有机化学
工程类
物理
光催化
量子力学
硅
作者
Qixian Xie,Zhao Cai,Pengsong Li,Daojin Zhou,Yongmin Bi,Xuya Xiong,Enyuan Hu,Yaping Li,Yun Kuang,Xiaoming Sun
出处
期刊:Nano Research
[Springer Nature]
日期:2018-03-20
卷期号:11 (9): 4524-4534
被引量:129
标识
DOI:10.1007/s12274-018-2033-9
摘要
Atomic composition tuning and defect engineering are effective strategies toenhance the catalytic performance of multicomponent catalysts by improvingthe synergetic effect; however, it remains challenging to dramatically tune the active sites on multicomponent materials through simultaneous defect engineeringat the atomic scale because of the similarities of the local environment. Herein,using the oxygen evolution reaction (OER) as a probe reaction, we deliberatelyintroduced base-soluble Zn(II) or Al(III) sites into NiFe layered double hydroxides(LDHs), which are one of the best OER catalysts. Then, the Zn(II) or Al(III) siteswere selectively etched to create atomic M(II)/M(III) defects, which dramaticallyenhanced the OER activity. At a current density of 20 mA·cm−2, only 200 mV overpotential was required to generate M(II) defect-rich NiFe LDHs, which is the best NiFe-based OER catalyst reported to date. Density functional theory(DFT) calculations revealed that the creation of dangling Ni–Fe sites (i.e., unsaturated coordinated Ni–Fe sites) by defect engineering of a Ni–O–Fe site at the atomic scale efficiently lowers the Gibbs free energy of the oxygen evolutionprocess. This defect engineering strategy provides new insights into catalysts atthe atomic scale and should be beneficial for the design of a variety of catalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI