电催化剂
催化作用
钴
卟啉
化学
析氧
氧气
无机化学
电化学
过渡金属
光化学
物理化学
有机化学
电极
作者
Haonan Qin,Yanzhi Wang,Bin Wang,Xiaoguang Duan,Haitao Lei,Xuepeng Zhang,Haoquan Zheng,Wei Zhang,Rui Cao
标识
DOI:10.1016/j.jechem.2020.05.015
摘要
Transition-metal based M-N4/C catalysts are appealing for electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Employing model catalysts, which have well-defined molecular structures and coordination environments, to investigate electrocatalytic performance of M-N4/C sites for ORR and OER is of fundamental significance. Herein, we reported the use of Co tetra(phenyl)porphyrin 1 and Co tetra(pentafluorophenyl)porphyrin 2 as models to probe the role of Co-N4/C sites for oxygen electrocatalysis. We showed that Co porphyrin 1 is more efficient than its structural analogue 2 for oxygen electrocatalysis in alkaline aqueous solutions, indicating that the electron-rich Co-N4/C site is more favored when noncovalently adsorbed on carbon supports. This work inspires rational design of reaction-oriented catalysts for sustainable energy storage and conversion technologies.
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