Tungsten Oxide Thin Film Electrode Cyclic Voltammetry
To study the cyclic voltammetry of tungsten oxide thin film electrode, use three-electrode system, sulfuric acid solucion as electrolyte, the property is observed by measuring light current. Below is cyclic voltammograms of WO3 thin film electrode being heat treatment under 450℃ under dark and 500W xenon light source (light strength 100Mw/cm2). Under darkness the polarization current of electrode is small within the scanning range, it is far smaller than anode polarization current under light. Photoelectrochemical reaction under light has good reversibility. Within electric potential 0.35~1.2V（vs.Ag/AgCl）, cathode Pt and anode WO3 thin film electrode reaction is as following: Anode：2OH - + h + → O 2 ↑+ 2H + Cathode：2H + + 2e - → H 2 ↑ When exposed to light, if the applied bias is low, the Fermi level of WO3 is higher, electrolysis solution accepter is easier to trap photo electron near WO3 electrolyte interface of electrode, so the photo current...