A facile template approach for the synthesis of mesoporous Fe3C/Fe-N- doped carbon catalysts for efficient and durable oxygen reduction reaction  

作　　者：Shuai Li Bo Li Liang Ma Jia Yang Hangxun Xu 

机构地区：[1]CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China

出　　处：《Chinese Chemical Letters》2017年第11期2159-2163,共5页中国化学快报（英文版）

基　　金：supported by the National Key Basic Research Program of China (No. 2015CB351903);National Natural Science Foundation of China (No. 51402282);China Postdoctoral Science Foundation (No. 2016M590579);the Fundamental Research Funds for the Central Universities

摘　　要：Facile synthetic approaches toward the development of efficient and durable nonprecious metal catalysts for the oxygen reduction reaction （ORR） are very important for commercializing advanced electrochemical devices such as fuel cells and metal-air batteries. Here we report a novel template approach to synthesize mesoporous Fe-N-doped carbon catalysts encapsulated with Fe3C nanoparticles. In this approach, the layer-structured FeOCI was first used as a template for the synthesis of a three- dimensional polypyrrole （PPy） structure. During the removal of the FeOCI template, the Fe^3＋ can be absorbed by PPy and then converted into Fe3C nanoparticles and Fe-N-C sites during the pyrolyzing process. As a result, the as-prepared catalysts could exhibit superior electrocatalytic ORR performance to the commercial Pt/C catalyst in alkaline solutions. Furthermore, the Zn-air battery assembled using the mesoporous carbon catalyst as the air electrode could surpass the commercial Pt/C catalyst in terms of the power density and energy density.Facile synthetic approaches toward the development of efficient and durable nonprecious metal catalysts for the oxygen reduction reaction （ORR） are very important for commercializing advanced electrochemical devices such as fuel cells and metal-air batteries. Here we report a novel template approach to synthesize mesoporous Fe-N-doped carbon catalysts encapsulated with Fe3C nanoparticles. In this approach, the layer-structured FeOCI was first used as a template for the synthesis of a three- dimensional polypyrrole （PPy） structure. During the removal of the FeOCI template, the Fe^3＋ can be absorbed by PPy and then converted into Fe3C nanoparticles and Fe-N-C sites during the pyrolyzing process. As a result, the as-prepared catalysts could exhibit superior electrocatalytic ORR performance to the commercial Pt/C catalyst in alkaline solutions. Furthermore, the Zn-air battery assembled using the mesoporous carbon catalyst as the air electrode could surpass the commercial Pt/C catalyst in terms of the power density and energy density.

关 键 词：Mesoporous carbon Polypyrrole Iron carbide nanoparticles Oxygen reduction reaction Electrocatalysis 

分 类 号：O643.36[理学—物理化学]