Electrodeposition and pseudocapacitive properties of tungsten oxide/polyaniline composite

► WO3 existed in small oxide particles through distribution in PANI to form WO3/PANI composite, resulting in the enhanced energy storage capabilities. ► The composite displayed pseudocapacitive properties over a broadened potential range of − 0.5 to 0.7 V vs. SCE. ► An asymmetric model capacitor using WO3/PANI and PANI as negative and positive electrodes, respectively displayed good pseudocapacitive behaviors over operating voltage of 1.2 V.