催化作用
酞菁
电子转移
电化学
化学
金属
碳纤维
兴奋剂
共轭体系
介电谱
电催化剂
氧气
光化学
材料科学
无机化学
复合数
纳米技术
物理化学
电极
有机化学
聚合物
复合材料
光电子学
作者
Xuhui Li,Ruixue Zhao,Yuanyuan Fu,Dawei Xu,Yuan Kang,ZhongFENG Li,Kai Li,Lirong Zheng,Xia Zuo
标识
DOI:10.1002/cctc.202200517
摘要
Abstract Metal phthalocyanines (MPcs) have highly conjugated π electron systems and metal atoms acting as active centers, and so exhibit excellent electrocatalytic performance during the oxygen reduction reaction (ORR). However, these complexes also tend to undergo aggregation and exhibit poor electrical conductivity and minimal durability, all of which hinder their large‐scale industrial applications. In the present study, iron phthalocyanine (FePc) is applied to hollow carbon shells (HCSs) to generate an ORR catalyst containing single Fe atoms(HCS‐O‐FePc). The HCSs have numerous N/O‐based surface functional groups that promote the formation of Fe−O bonds with the FePc held in an axial coordination position. These axial Fe−O bonds disrupt the electron symmetry in the plane of the FePc molecules, which facilitate electron transfer. 1100HCS‐O‐FePc exhibits an onset potential of 0.98 V (vs RHE), a half‐wave potential of 0.91 V (vs RHE), an electron transfer number of 3.90, and durability better than that of a 20 % commercial Pt/C catalyst. Electrochemical impedance spectroscopy demonstrates that the ORR process over this material likely proceeds via a rapid 2+2 electron mechanism. This composite displays excellent oxygen reduction properties and is a promising alternative to Pt‐based ORR catalysts.
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