Improved Specific Capacitance of Amorphous Vanadium Pentoxide in a Nanoporous Alumina Template

Abstract

This article investigates the physicochemical properties of vanadium pentoxide (V(2)O(5)) prepared by anodic electrodeposition onto two nanoporous alumina templates having pore sizes of 50 and 200 nm. V(2)O(5) formed inside the templates was an amorphous structure with flakelike (50 nm) and round (200 nm) shapes. The capacitance of V(2)O(5) was measured using cyclic voltammetry in 1 M KCl electrolyte, and ca. 900 F g(-1) of maximum specific capacitance was obtained from V(2)O(5) in 50 nm alumina oxide. Improved specific capacitance of V(2)O(5) is ascribed to the high surface area of the porous structure by the use of the template.