Preparation and Electrochemical Performance of Ag-TiO₂-MnO₂ Composites

Authors

Ling-xiao ZHANG, Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;
Hui-hui ZHAO, Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;
Li-juan ZHANG, Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;Follow
Yu FU, Beijing Key Laboratory for Green Catalysis and Separation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;

Corresponding Author

Li-juan ZHANG(zhanglj1997@bjut.edu.cn)

Abstract

The silver-titanium dioxide co-modified manganese dioxide (Ag-TiO₂-MnO₂) 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-TiO₂ modified MnO₂ samples both exhibited β-MnO₂ 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-TiO₂-MnO₂ sample. The modified samples were effective in improving specific discharge capacities. The specific discharge capacity increased from 75 mAh·g^-1 to 115 mAh·g^-1 at the rate of 1C. The stronger bond energy of Mn-O in the modified MnO₂ could suppress the volume expansion during the discharge process, which can maintain the structural stability of the manganese dioxide material.

Graphical Abstract

Keywords

line-height: 150%'>, mso-bidi-font-size: 10.5pt'>Manganese dioxide cathode material, Ag-TiO2, modification, electrochemical performance

DOI Link

https://doi.org/10.13208/j.electrochem.171130

Publication Date

2018-06-28

Online Available Date

2018-03-12

Revised Date

2018-01-09

Received Date

2017-11-30

Recommended Citation

Ling-xiao ZHANG, Hui-hui ZHAO, Li-juan ZHANG, Yu FU. Preparation and Electrochemical Performance of Ag-TiO₂-MnO₂ Composites[J]. Journal of Electrochemistry, 2018 , 24(3): 292-299.
DOI: 10.13208/j.electrochem.171130
Available at: https://jelectrochem.xmu.edu.cn/journal/vol24/iss3/12

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