Porous MoO3 films with ultra-short relaxation time used for supercapacitors

Porous MoO3 films with an ultra-short relaxation time used for supercapacitors have been prepared in acid peroxo-polymolybdate solution by electrodepositing on Ni foam directly in this study. Electrochemical measurements indicate that, the films behave an ideal supercapacitor characteristic in Na2SO4 electrolyte. The electrochemical impedance spectroscopy results demonstrate that, the films have a very low relaxation time constant (1 ms), which reveals a potential application prospect in filtering voltage ripple.

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► Porous MoO3 films are prepared by electrodeposition.
► The porous MoO3 films can behave as an ideal supercapacitor at an alternating current frequency up to 300 Hz.
► The porous MoO3 films have a very low relaxation time constant (1 ms).