A dual-active Co-CoO heterojunction coupled with Ti_(3)C_(2)-MXene for highly-performance overall water splitting

作     者：Dezheng Guo Xin Li Yanqing Jiao Haijing Yan Aiping Wu Ganceng Yang Yu Wang Chungui Tian Honggang Fu Dezheng Guo;Xin Li;Yanqing Jiao;Haijing Yan;Aiping Wu;Ganceng Yang;Yu Wang;Chungui Tian;Honggang Fu

作者机构：Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of ChinaHeilongjiang UniversityHarbin 150080China Department of Cardiovascular MedicineHeilongjiang Provincial HospitalHarbin 150080China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2022年第15卷第1期

页      面：238-247页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：supported by the National Key R&D Program of China(No.2018YFB1502401) the National Natural Science Foundation of China(Nos.21631004,21805073,U20A20250,and 21901064) the Natural Science Foundation of Heilongjiang Province(No.QC2018014) the University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province(Nos.UNPYSCT-2017123 and UNPYSCT-2017124) the Basic Research fund of Heilongjiang University in Heilongjiang Province(No.RCYJTD201801) Heilongjiang University Excellent Youth Foundation 

主　　题：overall water splitting MXene Co-CoO heterojunction electrocatalysis 

摘      要：Development of cost-effective and highly-efficient bifunctional hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)catalysts is crucial for overall water splitting in practical ***,we proposed a novel non-noble metal bifunctional,HER/OER electrocatalyst by synergistically coupling a dual-active Co-based heterojunction(Co-CoO)with high conductive and stable two-dimensional Ti_(3)C_(2)-MXene(defined as Co-CoO/Ti^(3)CrMXene).A series of characterizations and theoretical calculations verify that the synergistic effect of metallic Co with HER activity and Coo with OER performance leads to superb bifunctional catalytic performance,and Ti_(3)C_(2)-MXene can enhance electrical conductivity and prevent the aggregation of the Co-based catalysts,thereby improving both the activity arid ***-Co0/Ti_(3)C_(2)-MXene presents low onset potential(11onse1)of 8 mV and,Tafel slope of 47 mV·dec^(-1) for HER(close to that of Pt/C)and 17onset of 196 mV and Tafel slope of 47 mV·dec^(-1) for OER(superior to:that of Ru02).Assembled as an electrolyzer,Co-CoO/Ti_(3)C_(2)-MXene shows a low voltage of 1.55 V at 10 mA·cm^(-2),high Faradaic efficiency and remarkable *** can be driven by a solar cell of-1.55 V for consecutive production of hydrogen and oxygen gases.