Supercapacitor behavior of α-MnMoO4 nanorods on different electrolytes

α-MnMoO4 nanorods were prepared on conducting glass substrate via sol–gel spin coating method at the optimum doping level. The effect of electrolyte on the pseudocapacitance behavior of the α-MnMoO4 nanorods was studied using para toluene sulfonic acid (p-TSA), sulfuric acid (H2SO4) and hydrochloric acid (HCl) as electrolytes. X-ray diffraction analysis reveals the formation of α-MnMoO4 in monoclinic phase. FTIR spectra contain vibrational bands associated with MoO, M–O and Mo–O–Mo bonds. SEM image reveals the formation of nanorods. Supercapacitor behavior has been studied using cyclic voltammetry (CV) analysis. α-MnMoO4 nanorods exhibit maximum specific capacitance of 998 F/g at a scan rate of 5 mV/s in H2SO4 electrolyte while a specific capacitance of 784 F/g and 530 F/g have been obtained using p-TSA and HCl electrolytes, respectively. At higher scan rates p-TSA electrolyte exhibits superior capacitive behavior than H2SO4.

SEM image of α-MnMoO4 nanorods on FTO substrate.Figure optionsDownload as PowerPoint slideHighlights
► Synthesis of α-MnMoO4 nanorods by spin coating method.
► First study on the effect of electrolyte on the pseudocapacitance behavior.
► α-MnMoO4 nanorods exhibit maximum specific capacitance of 998 F/g.
► At higher scan rates p-TSA electrolyte exhibits superior capacitive behavior.