Electrochemically grown nanoporous MnO2 nanowalls on a porous carbon substrate with enhanced capacitance through faster ionic and electrical mobility

Abstract

We report the deposition of uniform porous MnO₂ nanowalls on a conducting carbon fiber substrate using a simple electrochemical method, which produces ordered nano-channels demarcated by the MnO₂ walls for easy ion transport and a continuous electron path created by the carbon backbone. The system achieves a specific capacitance of 1149 F g⁻¹ and retains 565 F g⁻¹ even at dragging conditions as high as 100 A g⁻¹.