催化作用
X射线吸收精细结构
Atom(片上系统)
钴
电催化剂
铂金
分子
吸附
热解
材料科学
结晶学
化学
物理化学
无机化学
光化学
电化学
有机化学
光谱学
计算机科学
物理
嵌入式系统
量子力学
电极
作者
Xinyang Wang,Leilei Zhang,Wensheng Yan,Xiaoyan Liu,Xiaofeng Yang,Shu Miao,Wentao Wang,Aiqin Wang,Tao Zhang
出处
期刊:Chemical Science
[The Royal Society of Chemistry]
日期:2016-01-01
卷期号:7 (9): 5758-5764
被引量:567
摘要
Co-N-C catalysts are promising candidates for substituting platinum in electrocatalysis and organic transformations. The heterogeneity of the Co species resulting from high-temperature pyrolysis, however, encumbers the structural identification of active sites. Herein, we report a self-supporting Co-N-C catalyst wherein cobalt is dispersed exclusively as single atoms. By using sub-Ångström-resolution HAADF-STEM in combination with XAFS and DFT calculation, the exact structure of the Co-N-C is identified to be CoN4C8-1-2O2, where the Co center atom is coordinated with four pyridinic N atoms in the graphitic layer, while two oxygen molecules are weakly adsorbed on Co atoms in perpendicular to the Co-N4 plane. This single-atom dispersed Co-N-C catalyst presents excellent performance for the chemoselective hydrogenation of nitroarenes to produce azo compounds under mild reaction conditions.
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