Effect of reduced graphene oxide-supported copper addition on electrochemical properties of La0.7Mg0.3Ni2.8Co0.5 electrodes

作     者：Xiantun Huang Zhiqiang Lan Jiacheng Li Hao Zhang Jin Guo 

作者机构：Department of Materials Science and EngineeringBaise CollegeBaise 533000China Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related TechnologyCollege of Physics Science and TechnologyGuangxi UniversityNanning 530004China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2019年第37卷第12期

页      面：1312-1319页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(51571065) the Natural Science Foundation of Guangxi Province(017GXNSFAA198337,2018GXNSFAA294125,2018GXNSFAA281308) the Innovation-Driven Development Foundation of Guangxi Province(AA17204063) 

主　　题：Kinetic properties Alloy electrode Electrochemical properties Graphene Rare earths 

摘      要：The reduced graphene oxide-supported copper(Cu@rGO)nanocomposite was introduced to improve the electrochemical properties of La0.7Mg0.3Ni2.8Co0.5alloy *** results show that adding Cu@rGO nanocomposite with mass fractions of x wt%(x=0,3,6 and 9)to the alloy electrodes provides electrodes with maximum discharge capacities of 368.9 mAh/g(x=0),373.2 mAh/g(x=3),407.3 mAh/g(x=6)and 398.6 mAh/g(x=9),and high-rate dischargeabilities at a discharge current density of1200 mA/g of 40.5%(x=0),64.0%(x=3),82.0%(x=6)and 76.0%(x=9).The addition of Cu@rGO nanocomposite also provides alloy electrodes with hydrogen diffusion coefficients of 3.7×10-10 cm2/s(x=0),4.1×10-10 cm2/s(x=3),4.2×10-10 cm2/s(x=6)and 4.0×10-10 cm2/s(x=9).Clearly,the addition of 6 wt%Cu@rGO nanocomposite not only increases the electrochemical capacity of La0.7Mg0.3Ni2.8Co0.5 alloy electrodes,but also improves their electrochemical kinetic properties.