Effect of temperature on the performance of ultrafine MnO2 nanobelt supercapacitors

Abstract

We have reported a facile, template-free and effective electrochemical method to grow MnO₂ ultrafine nanobelts on Ni foam. Electrochemical measurements showed that the MnO₂ nanobelt electrode exhibited an enhanced specific capacitance of 509 F g⁻¹ at 200 mA g⁻¹ at 50 °C. More importantly, the specific capacitance of the MnO₂ nanobelt electrode nearly has 91.3% retention after 5000 cycles with repeated heating and cooling in the temperature range of 0 to 50 °C, showing good high temperature-resistive long-term cycle stability.