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《Journal of Electrochemistry》 2018-03
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Preparation and Electrochemical Performance of Ag-TiO_2-MnO_2 Composites

ZHANG Ling-xiao;ZHAO Hui-hui;ZHANG Li-juan;FU Yu;Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology;  
The silver-titanium dioxide co-modified manganese dioxide(Ag-TiO_2-MnO_2)cathode material was prepared through high temperature solid state reaction.The microstructure,phase composition and electrochemical performance of the prepared samples were characterized by X-ray diffraction spectroscopy(XRD),scanning electron microscopy(SEM),Fourier transform infrared spectrometry(FT-IR),X-ray photoelectron spectroscopy(XPS),Energy-dispersive X-ray spectroscopy(EDS),Cyclic voltammetry(CV),galvanostatic discharge and electrochemical impedance spectroscopy(EIS).Results showed that the unmodified and Ag-TiO_2 modified MnO_2 samples both exhibitedβ-MnO_2 structurebut with different morphologies.The EDS mapping results revealed that Ag was uniformly dispersed on the surface of manganese dioxide,while Ti was relatively non-uniform in the Ag-TiO_2-MnO_2 sample.The modified samples were effective in improving specific discharge capacities.The specific discharge capacity increased from75 mAh·g~(-1 )to 115 mAh·g~(-1 )at the rate of 1C.The stronger bond energy of Mn-O in the modified MnO_2 could suppress the volume expansion during the discharge process,which can maintain the structural stability of the manganese dioxide material.
【Fund】: 北京市属高校高水平教师队伍建设支持计划(No.IDHT20180504);; 17内涵发展-课程和教材建设-优质教学资源立项(No.310000514117026)资助
【CateGory Index】: TB33;TM912
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