具有峰值氧空位含量的过渡金属氧化物用于氧电催化

作     者：王媛 韩玉 索伟然 张洁灵 赖小勇 李智敏 梁作中 曹国忠 Yuan Wang;Yu Han;Weiran Suo;Jieling Zhang;Xiaoyong Lai;Zhimin Li;Zuozhong Liang;Guozhong Cao

作者机构：School of Advanced Materials and NanotechnologyXidian UniversityXi’an 710126China Key Laboratory of Applied Surface and Colloid ChemistryMinistry of EducationSchool of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710119China State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical EngineeringCollege of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China Department of Materials Science and EngineeringUniversity of WashingtonSeattleWashington 98195-2120USA 

出 版 物：《Science China Materials》 (中国科学(材料科学(英文版))

年 卷 期：2023年第66卷第11期

页      面：4357-4366页

核心收录：

学科分类：081704[工学-应用化学] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China(22178213) the Key Research and Development Program of Shaanxi Province(2022GY-196,2022GY-201,2022GY-184) the Innovation Capability Support Program of Shaanxi(2023KJXX-018) the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(2022-K30) the Fundamental Research Funds for the Central Universities(GK202207007,GK202309002) the Open Project of Yunnan Precious Metals Laboratory Co.,Ltd(YPML-2023050246) 

主　　题：oxygen vacancy transition-metal oxides oxygen evolution reaction(OER) oxygen reduction reaction(ORR) Zn-air battery 

摘      要：在过渡金属氧化物中引入氧空位是提高电催化性能的有效途径.然而,控制金属氧化物的缺陷工程仍然面临挑战.在此,我们报道了一种通过调节热解温度制备相应的金属氧化物来反映氧空位含量峰值的方法.具体来说,Co(OH)_(2)在空气中400℃热解生成的Co_(3)O_(4)纳米花具有最多的氧空位.大量氧空位含量的产生可能是由于丰富的多孔结构和Co和O原子的重排过程导致的.电化学结果表明,在1.0molL^(-1)KOH条件下,当电流密度j=10mAcm^(-2)时,在400℃条件下制备的富氧空位缺陷的Co_(3)O_(4)(Co_(3)O_(4)-400)与Co_(3)O_(4)-300(348mV)和Co_(3)O_(4)-500(366mV)相比,析氧反应的过电位η最低,为321mV.理论计算和实验证实了Co_(3)O_(4)中氧空位的有利作用.本研究为开发具有优化氧空位的高活性过渡金属氧化物提供了新的见解.