过电位
塔菲尔方程
聚丙烯腈
材料科学
析氧
化学工程
碳纤维
电化学
催化作用
纳米颗粒
热解
纳米技术
兴奋剂
复合数
聚合物
电极
复合材料
光电子学
物理化学
有机化学
工程类
化学
作者
Yafei Zhao,Yan Guo,Xingwen Lu,Deyan Luan,Xiaojun Gu,Xiong Wen David Lou
标识
DOI:10.1002/adma.202203442
摘要
The development of efficient and cost-effective electrocatalysts toward the oxygen evolution reaction (OER) is highly desirable for clean energy and fuel conversion. Herein, the facile preparation of Ni single atoms embedded hollow S/N-doped carbon macroporous fibers (Ni SAs@S/N-CMF) as efficient catalysts for OER through pyrolysis of designed CdS-NiSx /polyacrylonitrile composite fibers is reported. Specifically, CdS provides the sulfur source for the doping of polyacrylonitrile-derived carbon matrix and simultaneously creates the hollow macroporous structure, while NiSx is first reduced to nanoparticles and finally evolves into single Ni atoms through the atom migration-trapping strategy. Benefiting from the abundantly exposed single Ni atoms and hollow macroporous structure, the resultant Ni SAs@S/N-CMF electrocatalysts deliver outstanding activity and stability for OER. Specifically, it needs an overpotential of 285 mV to achieve the benchmark current density of 10 mA cm-2 with a small Tafel slope of 50.8 mV dec-1 .
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