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王晗,李曼,许海媚,祝江赛,王志峰,秦春玲.纳米多孔铜银/二氧化锰复合电极材料的制备及储能研究[J].稀有金属材料与工程(英文),2018,47(12):3860~3866.[Wang han,Li man,Xu haimei,Zhu jiangsai,Wang zhifeng and Qin chunling.The Preparation of Nanoporous CuAg Bimetal/Manganese Dioxide Composites and High Performance Button Type Electrochemistry Energy Storage Device[J].Rare Metal Materials and Engineering,2018,47(12):3860~3866.]
The Preparation of Nanoporous CuAg Bimetal/Manganese Dioxide Composites and High Performance Button Type Electrochemistry Energy Storage Device
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Received:April 02, 2017  Revised:September 14, 2017
DOI:
Key words: Cu-based metallic glasses precursor  nanoporous CuAg bimetal  manganese dioxide  electrochemistry energy storage device  specific capacitance
Foundation item:国家自然科学基金(项目号51671077),河北省自然科学基金(E2016202212,E2015202081),河北省百人计划(E2012100009),研究生创新项目(220056)
Author NameAffiliation
Wang han,Li man,Xu haimei,Zhu jiangsai,Wang zhifeng and Qin chunling  
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Abstract:
      Nanoporous CuAg bimetal/manganese dioxide (NP-CuAg/MnO2) composites as electrode materials have been successfully synthesized by chemically depositing manganese dioxide (MnO2) on nanoporous CuAg bimetal (NP-CuAg). NP-CuAg can be produced by chemical dealloying the Cu-Zr-Ag metallic glasses. The phases and microstructures of NP-CuAg and NP-CuAg/MnO2 composite materials were examined by XRD and SEM. The electrochemical properties of the NP-CuAg/MnO2 composite electrode materials were investigated by cyclic voltammetry and galvanostatic charge-discharge measurements. For the NP-CuAg-supported MnO2 composites, the MnO2 nanoflakes are deposited on the surface of the NP-CuAg substrate. Owing to the three dimensional continuous nanoporous structure and excellent electrical conductivity of NP-CuAg, the MnO2 nanoflakes can produce much larger surface area as compared to its aggregate particles. Moreover, the NP-CuAg/MnO2 composite materials exhibit higher electrical conductivity than the NPC/MnO2 composite materials. Thus, the utilization of MnO2 surface active sites is improved, which leads to the higher specific capacitance. The specific capacitance increases with the increase of the Ag content in the precursor alloy. Cu45Zr45Ag10 ribbon after dealloying in 0.1 M HF for 10 h, the specific capacitance reaches to 392.86 F/g. The button type energy storage device encapsulated by the NP-CuAg/MnO2 composite electrode materials, is able to light on the LED.