Understanding the Influence of Polypyrrole Coating over \V2O5\ Nanofibers on Electrochemical Properties
By Xing Sun and Qiang Li and Yuanbing Mao
Published in Electrochimica Acta
NULL
2015
Abstract
As an example of hybrid electrode materials for electrochemical energy storage with potential to deliver high specific capacitance, rate capability and energy density in addition to low inner resistance, \V2O5\ nanofibers wrapped with polypyrrole (PPy) were synthesized. This study focused on the understanding of the synergistic effect of the V2O5@PPy nanocomposites as well as the individual role of each component on electrochemical properties. To explore the cooperative effects of individual functional materials, a classic model was applied to the V2O5@PPy nanocomposites for the first time to simulate and analyze the partitioned contributions from the electric double-layer capacitance and pseudocapacitance of the V2O5@PPy nanocomposites with various \PPy\ coating amounts. The optimal ratio of \PPy\ to \V2O5\ was determined to be ?40% where the sum of the polymer's electric double-layer (EDL) capacitance and the layered oxide
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