Electronic Supporting Information Electrochemically grown nanoporous MnO2 nanowall forest on porous carbon substrate with enhanced capacitance through faster ionic and electrical mobility

Materials: Manganese acetate (MnAc 2), ammonium acetate (NH 4 Ac) and sodium sulfate (Na 2 SO 4) were purchased from Rankem Chemicals. All the chemicals were used as received without any further purification. Carbon paper having a thickness of 0.3 mm was purchased from Toray. used as the working electrode, Pt was used as the counter electrode and Ag/AgCl was used as the reference electrode. Deposition was carried out in a solution containing 0.1 M (0.49 g) Mn(Ac) 2 and 0.1 M (0.154 g) NH 4 Ac salt in 20 ml of deionized water. 1 cm 2 area of carbon paper was kept exposed to electrolyte and the remaining part was masked using Kapton adhesive tape. Experiments were carried out at a constant potential of 0.6 V Vs Ag/AgCl for Electronic Supplementary Material (ESI) for Chemical Communications.