An Approach to Optimize the Composition of Supercapacitor Electrodes Consisting of Manganese-Molybdenum Mixed Oxide and Carbon Nanotubes

We have fabricated composite electrode materials consisting of manganese-molybdenum mixed oxide and carbon nanotubes (CNTs) for supercapacitor application. The process involves electrophoretic deposition (EPD) of multi-walled CNTs onto an ITO electrode, followed by anodic deposition of Mn-Mo oxide from an aqueous Mn(II) solution containing MoO(4)(2-) anions. Electrochemical properties of the composite electrodes with various combinations of Mn-Mo oxide and CNTs were evaluated systematically with the aim of maximizing the electrochemical utilization of the oxide. Optimization led to a high specific capacitance of 408 F g (1) at a scan rate of 2 mVs(-1), with an area-normalized capacitance of 31 mF cm(-2) (or a volume-normalized capacitance of 76 F cm(-3)). (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3578039]