析氧
电催化剂
电化学
化学
金属
氮化物
化学工程
镍
纳米技术
非阻塞I/O
电导率
催化作用
材料科学
电极
物理化学
有机化学
工程类
生物化学
图层(电子)
作者
Ke Xu,Pengzuo Chen,Xiuling Li,Yun Tong,Hui Ding,Xiaojun Wu,Wangsheng Chu,Zhenmeng Peng,Changzheng Wu,Yi Xie
摘要
Exploring efficient and inexpensive oxygen evolution reaction (OER) electrocatalysts is of great importance for various electrochemical energy storage and conversion technologies. Ni-based electrocatalysts have been actively pursued because of their promising activity and earth abundance. However, the OER efficiency for most of the developed Ni-based electrocatalysts has been intrinsically limited due to their low electrical conductivity and poor active site exposure yield. Herein, we report metallic Ni3N nanosheets as an efficient OER electrocatalyst for the first time. The first-principles calculations and electrical transport property measurements unravel that the Ni3N is intrinsically metallic, and the carrier concentration can be remarkably improved with dimensional confinement. The EXAFS spectra provide solid evidence that the Ni3N nanosheets have disordered structure resultant of dimensional reduction, which then could provide more active sites for OER. Benefiting from enhanced electrical conductivity with metallic behavior and atomically disordered structure, the Ni3N nanosheets realize intrinsically improved OER activity compared with bulk Ni3N and NiO nanosheets. Our finding suggests that metallic nitride nanosheets could serve as a new group of OER electrocatalysts with excellent property.
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