Oxygen defect-rich double-layer hierarchical porous Co3O4 arrays as high-efficient oxygen evolution catalyst for overall water splitting

作     者：Puxuan Yan Meilin Huang Benzhi Wang Zixia Wan Mancai Qian Hu Yan Tayirjan Taylor Isimjan Jianniao Tian Xiulin Yang Puxuan Yan;Meilin Huang;Benzhi Wang;Zixia Wan;Mancai Qian;Hu Yan;Tayirjan Taylor Isimjan;Jianniao Tian;Xiulin Yang

作者机构：Guangxi Key Laboratory of Low Carbon Energy MaterialsSchool of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004GuangxiChina School of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004GuangxiChina Saudi Arabia Basic Industries Corporation(SABIC)at King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第8期

页      面：299-306,I0011页

核心收录：

学科分类：0820[工学-石油与天然气工程] 081702[工学-化学工艺] 0808[工学-电气工程] 081705[工学-工业催化] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (no.21965005) Natural Science Foundation of Guangxi Province (2018GXNSFAA294077, 2018GXNSFAA281220) Project of High-Level Talents of Guangxi (FKA18015, 2018ZD004) Innovation Project of Guangxi Graduate Education (XYCSZ2019056, YCBZ2019031) 

主　　题：Metal-organic frameworks Array-like structure Oxygen defects Oxygen evolution Water splitting 

摘      要：Construction of oxygen evolution electrocatalysts with abundant oxygen defects and large specific surface areas can significantly improve the conversion efficiency of overall water ***,we adopt a controlled method to prepare oxygen defect-rich double-layer hierarchical porous Co3O4 arrays on nickel foam(DL-Co3O4/NF)for water *** unique array-like structure,crystallinity,porosity,and chemical states have been carefully investigated through SEM,TEM,XRD,BET,and XPS *** designated DL-Co3O4/NF has oxygen defects of up to 67.7%and a large BET surface area(57.4 m2g-1).Electrochemical studies show that the catalyst only requires an overpotential of 256 mV to reach 20 mA cm-2,as well as a small Tafel slope of 60.8 mV dec-1,which is far better than all control ***,the catalyst also demonstrates excellent overall water splitting performance in a two-electrode system and good long-term stability,far superior to most previously reported *** mechanisms indicate that abundant oxygen vacancies provide more active sites and good *** the same time,the unique porous arrays facilitate electrolyte transport and gas emissions,thereby synergistically improving OER catalytic performance.