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

摘要

The electrodeposition of nanoporous tungsten oxide (WO_3) on the surface of carbon ceramic electrode (CCE) was described. The morphology of the WO_3 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 μM (S/N = 3) and the sensitivity of 16.8 AM~(-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.