Fe3+/Fe2+氧化还原电解液在高性能聚苯胺/SnO2超级电容器中的应用

摘要

报道 Fe3+/Fe2+氧化还原电解液在聚苯胺/SnO2超级电容器中的应用，研究不同浓度的 Fe3+/Fe2+离子对与1 mol/L H2SO4溶液组成的氧化还原电解液在超级电容器中的赝电容行为。用循环伏安法、恒电流充放电法和交流阻抗法对超级电容器的电化学性能进行研究。当Fe3+/Fe2+浓度为0.4 mol/L时，超级电容器的性能最好，其在1 A/g电流密度下的比容量达到1172 F/g。将聚苯胺/SnO2超级电容器进行长期的循环实验，经过充放电循环2000次后，其起始容量保持率达到88%。实验结果表明，使用Fe3+/Fe2+氧化还原电解液来提高能量储存装置的性能具有很好的前景。%The Fe3+/Fe2+ redox electrolyte for use in polyaniline/tin oxide (PANI/SnO2)supercapacitors was reported. The influences of redox electrolyte based on different Fe3+/Fe2+ ion pair concentrations in 1 mol/LH2SO4 solution on the pseudocapacitive behaviors of PANI/SnO2 supercapacitor were investigated. The electrochemical properties of the supercapacitor were studied by cyclic voltammetry (CV), galvanostatic charge−discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques. It is found that the performance of the supercapacitor is the best when the Fe3+/Fe2+ concentrationis 0.4 mol/L and its initial specific capacitance is 1172 F/g at an applied current density of 1 A/g. The long-term cycling experiment shows good stability with the retention of initial capacitance values of 88% after 2000 galvanostatic cycles. The experimental results testify that using Fe3+/Fe2+ redox electrolyte has a good prospect for improving the performances of energy-storage devices.