摘要
以酵母生物质为碳源,采用共水热法一步制备酵母生物质碳与三维立体石墨烯的复合材料,作为锂空气电池的阴极。通过扫描电镜、能谱分析等手段的物理性能表征及循环伏安、交流阻抗和充放电循环的电化学性能测试,结果表明,酵母生物质碳在三维立体石墨烯表面分布较为均匀,并且其表面存在N等元素,循环伏安测试表现出明显的氧化峰和还原峰。在电流密度为40 mA/g的条件下,按电极总质量计算出电极的比容量为3 100 mAh/g,电极放电平台为2.6 V左右,充电平台约为4.5 V,随着电流密度增加,电池容量下降,当电流密度达到100和200 mA/g时,对应比容量分别为2 300和1 300 mAh/g,表现出较好的电化学性能,保持了较好的催化活性。
In this paper,yeast biomass carbon and three-dimensional graphene composite electrode were prepared by one-step synthesis method.Through the physical characterization test by SEM,EDS and the electrochemical performance test by EIS,AC impedance and charge-discharge cycle,the results show that yeast biomass carbon is evenly distributed on the surface of three-dimensional graphene and there are elements such as N,etc on the surface of composite electrode.The CV curves shows that there are obvious oxidation peak and reduction peak.When the current density is 40 mA/g,the specific capacity of the electrode is 3100 mAh/g,the electrode discharge platform is about 2.6 V and the charging platform is about 4.5 V.With the increasing of detectable current density,the battery capacity decreases.When the detectable current density is 100 and 200 mA/g respectively,the corresponding capacities were 2 300 and 1 300 mAh/g,which shows good catalytic activity.
作者
万伟华
戴长松
朱星宝
WAN Weihua;DAI Changsong;ZHU Xingbao(School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin Heilongjiang 150001,China;MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,Harbin Institute of Technology,Harbin Heilongjiang 150001,China;State Key Laboratory of Advanced Chemical Power Sources,Zunyi Guizhou 563003,China;School of Physics,Harbin Institute of Technology,Harbin Heilongjiang 150001,China)
出处
《电源技术》
CAS
北大核心
2023年第5期659-662,共4页
Chinese Journal of Power Sources
关键词
三维石墨烯
生物质碳
复合电极
three-dimensional graphene
biomass carbon material
composite electrode
