LAUSR

Abstract α-MoO 3 is a well-investigated layer-structured material for intercalation of different ions. Here, for the first time , we utilized Be 2+ electrolyte for electrochemical characterization of α-MoO 3 for supercapacitor applications. Our studies revealed a minimized detrimental effect of proton (H + ) co-intercalation at a high current density 25 Ag −1 resulting in excellent cyclability with a specific capacitance of 169 Fg −1 and a retention of 81% capacitance after 2000 cycles. The electrochemical impedance and ionic diffusion measurements reflected a reduced intercalation of H + and higher diffusion coefficient of Be 2+ as the contributing factors for unusually high and stable capacitance of MoO 3 at high current density.