自组装制备氧化石墨烯负载钴镍电催化剂及性能研究  

Preparation and of CoNi electrocatalyst loading on GO by self-assembly

作　　者：于海峰 王芳 高亚辉[1] 王志谋 梁鹏举 Yu Haifeng;Wang Fang;Gao Yahui;Wang Zhimou;Liang Pengju(School of Environmental Engineering and Chemistry,Luoyang Institute of Technology,Luoyang 471023;State Key Laboratory of Organic-Inorganic Composites,Beijing University of Chemical Technology,Beijing 100029;Henan Province International Joint Laboratory ofMaterials for Solar Energy Conversion and Lithium Sodiumbased Battery,Luoyang 471023;College of Life Science,Tarim University,Alar 843300)

机构地区：[1]洛阳理工学院环境工程与化学学院,洛阳471023 [2]北京化工大学有机无机复合材料国家重点实验室,北京100029 [3]河南省太阳能转换及锂钠基储能电池材料国际联合实验室,洛阳471023 [4]塔里木大学生命科学学院,阿拉尔843300

出　　处：《化工新型材料》2021年第8期125-131,共7页New Chemical Materials

基　　金：国家自然科学基金(21968031和21865027);北京化工大学有机无机复合材料国家重点实验室开放课题(oic-201801008);河南省重点研发与推广专项项目(212102310409);洛阳理工学院高层次人才启动基金(2018BZ05)。

摘　　要：氧还原和氧析出是燃料电池、金属空气电池中关键的电化学反应。为了促进氧还原和氧析出反应的动力学过程,剥离制备了表面具有负电荷的氧化石墨纳米片和表面带有正电荷的钴镍纳米片层,基于静电作用通过层层自组装的方法,制备了结构有序的氧化石墨烯负载的钴镍双羟基氢氧化物纳米片层材料,并进一步通过煅烧得到了同样结构有序的具有尖晶石结构的钴镍过渡金属氧化物。通过SEM、EDS和XRD表征了所制备材料的微观结构和组成,通过电化学测试研究了所制备材料对于氧还原和氧析出反应的催化性能。结果表明,自组装制备的氧化石墨烯负载的钴镍双羟基氢氧化物纳米片具有良好的氧还原催化活性,极限电流密度和商品化的碳载铂相当,远远超过了传统的水热法合成的钴镍双羟基氢氧化物。这种催化活性的提高主要来源于自组装方法制备的材料在结构上的高度有序,钴镍双羟基氢氧化物层状结构的优势以及石墨烯的载体效应。同时,由其转变得到的具有尖晶石结构的钴镍氧化物对氧析出反应表现出较好的催化性能。Oxygen reduction and oxygen evolution are the key electrochemical reactions in fuel cells and metalair batteries.In order to promote the kinetic process of oxygen reduction and oxygen evolution reaction,graphite oxide(GO)nanosheets with a negative charge on the surface and cobalt-nickel nanosheets with a positive charge on the surface were exfoliate for preparing GO-supported cobalt-nickel(CoNi)layered double hydroxide nanosheet with ordered structure.Specially,the GO-supported CoNi layered double hydroxide nanosheet can transform to CoNi transition metal oxide with spinel structure at a certain condition by calcination.The microstructure and composition of the prepared materials was studied by SEM combined with EDS and XRD characterization.The catalytical performance of the prepared materials for oxygen reduction and oxygen evolution reaction was studied by electrochemical tests.The results shown that the GO-supported CoNi dihydroxy hydroxide nanosheets prepared by self-assembly had good oxygen reduction catalytic activity,and the limiting current density was comparable to the commercial carbon-supported platinum,which was far more than the corresponding material synthesized via traditional hydrothermal method.This improvement in catalytic activity was mainly due to the highly ordered structure of the materials prepared by the selfassembly method,the advantages of the layered structure of CoNi dihydroxy hydroxide,and the advantage of the GO supporter.At the same time,the CoNi oxide with spinel structure obtained from the transformation showed good catalytic performance for the oxygen evolution reaction.

关 键 词：自组装 氧化石墨烯 负载 层状化合物 电催化 

分 类 号：TB321[一般工业技术—材料科学与工程]