超顺磁性
材料科学
异质结
催化作用
析氧
化学工程
氧气
壳体(结构)
电化学
芯(光纤)
氧还原反应
磁芯
纳米技术
磁化
电极
光电子学
复合材料
化学
物理化学
磁场
工程类
物理
电气工程
有机化学
量子力学
生物化学
电磁线圈
作者
Dongquan Peng,Ce Hu,Xingfang Luo,Jinli Huang,Yan Ding,Wenda Zhou,Hang Zhou,Yong Yang,Ting Yu,Wen Lei,Cailei Yuan
出处
期刊:Small
[Wiley]
日期:2022-11-20
卷期号:19 (3)
被引量:34
标识
DOI:10.1002/smll.202205665
摘要
Abstract Although (oxy)hydroxides generated by electrochemical reconstruction (EC‐reconstruction) of transition‐metal catalysts exhibit highly catalytic activities, the amorphous nature fundamentally impedes the electrochemical kinetics due to its poor electrical conductivity. Here, EC‐reconstructed NiFe/NiFeOOH core/shell nanoparticles in highly conductive carbon matrix based on the pulsed laser deposition prepared NiFe nanoparticles is successfully confined. Electrochemical characterizations and first‐principles calculations demonstrate that the reconstructed NiFe/NiFeOOH core/shell nanoparticles exhibit high oxygen evolution reaction (OER) electrocatalytic activity (a low overpotential of 342.2 mV for 10 mA cm −2 ) and remarkable durability due to the efficient charge transfer in the highly conductive confined heterostructure. More importantly, benefit from the superparamagnetic nature of the reconstructed NiFe/NiFeOOH core/shell nanoparticles, a large OER improvement is achieved (an ultralow overpotential of 209.2 mV for 10 mA cm −2 ) with an alternating magnetic field stimulation. Such OER improvement can be attributed to the Néel relaxation related magnetic heating effect functionalized superparamagnetic NiFe cores, which are generally underutilized in reconstructed core/shell nanoparticles. This work demonstrates that the designed superparamagnetic core/shell nanoparticles, combined with the large improvement by magnetic heating effect, are expected to be highly efficient OER catalysts along with the confined structure guaranteed high conductivity and catalytic stability.
科研通智能强力驱动
Strongly Powered by AbleSci AI