氮气
碳纤维
材料科学
氧还原
还原(数学)
化学工程
兴奋剂
多孔性
氧还原反应
氧气
化学
无机化学
有机化学
物理化学
电化学
复合材料
光电子学
复合数
工程类
数学
电极
几何学
作者
Yingchun Guo,Feng Liu,Lei Feng,Xiaomei Wang,Xu Zhang,Jinsheng Liang
标识
DOI:10.1016/j.cej.2021.132150
摘要
• Single Co atoms anchored on hierarchically ordered porous carbon were fabricated. • Ordered hierarchical structure can introduce highly accessible single Co sites. • As-prepared Co-SAs@NHOPC exhibited superior catalytic activity and stability. • The Co-SAs@NHOPC can be used as an efficient cathode for Zn-air batteries. Constructing ordered macro-mesoporous carbon with nonprecious metal single-atom sites to improve the utilization rate of the inaccessible active sites inside the carbon can significantly facilitate its catalytic performance and reduce costs. Herein, by elaborate design, we pyrolyze ordered macro-microporous bimetallic single-crystalline ZnCo-ZIFs to fabricate single Co atoms anchored on N-doped hierarchically ordered porous carbon (Co-SAs@NHOPC) that showed an excellent yield of 99% and outstanding selectivity of > 99% for quinolines hydrogenation reaction (QHR). Besides, the obtained Co-SAs@NHOPC also exhibited excellent performance for the oxygen reduction reaction (ORR) in 0.1 M KOH with a half-wave potential of 0.851 V versus reversible hydrogen electrode (RHE). The as-obtained Co-SAs@NHOPC structure is the exquisite integration of the three-dimensional (3D) bicontinuous porous frameworks, the inherited micropores within N-doped carbon skeletons, well-defined tetrakaidecahedron morphology, and atomically dispersed Co atoms. The 3D hierarchical porous characteristics allow the reactants to contact the active sites inside the N-doped carbon and improve the mass transfer efficiency, thereby improving the atom utilization rate for QHR and ORR.
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