Co-POM@MOF-derivatives with trace cobalt content for highly efficient oxygen reduction  

作　　者：Yitao Song Yewang Peng Shuang Yao Peng Zhang Yujie Wang Jianmin Gu Tongbu Lu Zhiming Zhang 

机构地区：[1]Institute for New Energy Materials and Low Carbon Technologies,School of Materials Science&Engineering,School of Chemistry and Chemical Engineering,Tianjin University of Technology,Tianjin 300384,China [2]State Key Laboratory of Metastable Materials Science and Technology(MMST),Yanshan University,Qinhuangdao 066004,China

出　　处：《Chinese Chemical Letters》2022年第2期1047-1050,共4页中国化学快报（英文版）

基　　金：supported by the Natural Science Foundation of Tianjin City of China (No.18JCJQJC47700)。

摘　　要：A simple and effective method for constructing highly efficient oxygen reduction catalysts with trace amount of isolated cobalt was firstly developed by the pyrolysis of Co-centered polyoxometalate@metalorganic framework (Co-POM@MOF).The Co-centered polyoxometalate ([Co W_(12)O_(40)]^(6-)) was confined in the well-defined void space of ZIF-8 to achieve homogeneous dispersion of polyoxoanions,where the isolated Co centers were well surrounded by the W-O shell and ZIF-8 framework.The Co-POM@MOF-derived N-doping porous carbon (Co-W-NC) with trace cobalt content was facilely prepared by the pyrolysis of the Co-POM@MOF under Ar atmosphere.The single dispersion of polyoxoanions in the metal-organic framework with complete separation of Co center surrounding by W-O shell and ZIF-8 framework ensures the uniform dispersion of Co atoms,confirmed by the Fourier transform extended X-ray absorption fine structure measurement.The Co-W-NC composite catalysts exhibit high performance for oxygen reduction reactions with a half-wave potential of 0.835 V in 0.1 mol/L KOH solution with excellent durability,which is much superior to that of the control samples derived from the[PW_(12)O_(40)]@ZIF-8,and the commercial Pt/C.This work highlights a new insight for constructing highly efficient catalysts via the introduction of metal-centered polyoxometalate into metal-organic framework following the high temperature treatment process.

关 键 词：Metal-organic framework POLYOXOMETALATE POLYOXOANION Oxygen reduction ELECTROCATALYSIS 

分 类 号：TQ426[化学工程]