Temperature-controlled hydrothermal synthesis of γ-MnOOH, Mn3O4 and MnCO3 on a carbon cloth for supercapacitor applications

Abstract

In this study, a reaction temperature-controlled synthesis of γ-MnOOH, Mn₃O₄ and MnCO₃ (and also their mixture) on carbon cloth via a hydrothermal method is investigated, and the formation mechanism is discussed. The experiments demonstrate that the reducing ability of the carbon cloth tuned by the reaction temperature dominates the compositions and morphologies of the final products. A clear conversion process from Mn₇O₁₃·5H₂O to MnCO₃via γ-MnOOH and Mn₃O₄ on carbon cloth with an increase in the reaction temperature from 100 °C to 220 °C is confirmed. The electrochemical performance of γ-MnOOH on carbon cloth synthesized at 140 °C and MnCO₃ as the main component on carbon cloth synthesized at 220 °C are investigated and both show high performance.