摘要
采用硝酸锰(Mn(NO3)2)、甘氨酸(NH2CH2COOH)为原料,利用溶液燃烧法将锰氧化物通过一步反应直接包覆在碳纸表面,获得三维且具有纳米多孔结构的四氧化三锰/碳复合电极材料。利用扫描电镜(SEM)及X射线衍射(XRD)对该材料的表面形貌、结构和物相进行分析表征。采用Princeton电化学工作站和Arbin超电容测试系统对材料的电化学性能进行测试。结果表明:通过调整反应物Mn(NO3)2与NH2CH2COOH的比例,可获得不同包覆形貌的锰/碳复合材料。Mn(NO3)2与NH2CH2COOH的物质的量比n(Mn(NO3)2)/n(NH2CH2COOH)为1时,得到锰氧化物连续包覆的三维纳米多孔复合电极材料。所制备的电极材料的电化学性能优良,在0.5 A/g的电流密度下,比容量达到201 F/g。在5 A/g的电流密度下循环1 000次后,仍保持94%的初始容量。
A novel solution combustion synthesis method was used to prepare 3-D nanoporous Mn304/C composite electrode, with manganese oxide covered uniformly on the surface of carbon paper. Manganous nitrate （Mn（NO3）2）and glycine （NH2CH2COOH） were used as reactants. The morphology, microstructure and phase composition of the as-prepared samples were characterized by scanning electron microscopy and X-ray diffraction analysis. The electrochemical studies of the hybrid structure were conducted in Princeton workstation and Arbin systerm. Different morphologies of manganese oxide were obtained by tuning the ratio of the reactants. And the results show that the composite possesses a continuous, uniform morphology when the ration of manganous nitrate and NH2CH2COOH is 1：1. The hybrid structure shows excellent electrochemical performance, with a specific capacitance of 201 F/g at a current density of 0.5A/g, as well as good long-term cycle stability, with a retention of 94% of the initial capacitance after 1000 cycles.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2015年第2期312-318,共7页
Materials Science and Engineering of Powder Metallurgy
基金
教育部新世纪优秀人才计划资助项目
关键词
溶液燃烧合成
氧化锰
碳纸
超级电容器
solution combustion synthesis
manganese oxide
carbon paper
supercapacitor
