Preparation of tungsten oxide nanoporous thin film at carbon ceramic electrode for electrocatalytic applications

The electrodeposition of nanoporous tungsten oxide (WO3) on the surface of carbon ceramic electrode (CCE) was described. The morphology of the WO3 modified electrode was characterized by scanning electron microscopy and X-ray diffraction. The modified electrode was utilized as an electrochemical hydrogen peroxide sensor in a low potential with a high sensitivity and selectivity. The role of supporting matrix on the sensitivity of modified electrode was studied. The detection limit of 0.26 mu M (S/N = 3) and the sensitivity of 16.8 A M-1 cm(-2) were compared with some other metal oxides hydrogen peroxide sensors. The modified electrode has exhibited good reproducibility, long-term stability and negligible interference of some inorganic and biological compounds. (C) 2011 Elsevier Ltd. All rights reserved.