Synthesis and electrochemical properties of Er/α-MnO2 microspheres for supercapacitors application
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Er-doped α-MnO2 (Er/α-MnO2) microspheres were successfully synthesized via a chemical process. The various techniques were used to investigate the crystal structures, morphologies, valence states, and electrochemical performances of the as-prepared materials. The results showed that Er can be doped into the lattice of α-MnO2 as Er3+ to distinctly affect the structure of α-MnO2. The as-obtained Er(1.5 at.%)/α-MnO2 presented the most optimized structure with a surface composed of many regular layered triangles. The specific capacitance of Er(1.5 at.%)/α-MnO2 electrodes reached 224.3 F g−1 at a current density of 0.25 A g−1 with a capacity retention ratio of 93.7% after 2000 cycles at a current density of 1.0 A g−1. The values were higher than those of α-MnO2 synthesized under the same conditions. Overall, these findings look promising for future applications of rare elements in modified MnO2.
KeywordsElectrochemical performance α-MnO2 Er-doping Supercapacitor
This work was supported by the Fundamental Research Funds for the Central Universities Key Project (Grant No. XDJK2017B062) and the National Science Foundation for Young Scientists of China (Grant No.51605392).
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