MoO3/WO3/rGO as electrode material for supercapacitor and catalyst for methanol and ethanol electrooxidation
Mohammad Bagher Askari, Parisa Salarizadeh, Mohammad Hassan Ramezan zadeh
Abstract
Abstract The potential of metal oxides in electrochemical energy storage encouraged our research team to synthesize molybdenum oxide/tungsten oxide nanocomposites (MoO 3 /WO 3 ) and their hybrid with reduced graphene oxide (rGO), in the form of MoO 3 /WO 3 /rGO as a substrate with relatively good electrical conductivity and suitable electrochemical active surface. In this context, we presented the electrochemical behavior of these nanocomposites as an electrode for supercapacitors and as a catalyst in the oxidation process of methanol/ethanol. Our engineered samples were characterized by X-ray diffraction pattern and scanning electron microscopy. As a result, MoO 3 /WO 3 and MoO 3 /WO 3 /rGO indicated specific capacitances of 452 and 583 F/g and stability of 88.9% and 92.6% after 2000 consecutive GCD cycles, respectively. Also, MoO 3 /WO 3 and MoO 3 /WO 3 /rGO nanocatalysts showed oxidation current densities of 117 and 170 mA/cm 2 at scan rate of 50 mV/s, and stability of 71 and 89%, respectively in chronoamperometry analysis, in the MOR process. Interestingly, in the ethanol oxidation process, corresponding oxidation current densities of 42 and 106 mA/cm 2 and stability values of 70 and 82% were achieved. MoO 3 /WO 3 and MoO 3 /WO 3 /rGO can be attractive options paving the way for prospective alcohol-based fuel cells.