Abstract
We report an efficient solar-light-driven photocatalyst based on three-dimensional nanoporous tungsten trioxide (WO3) films. These films are obtained by anodizing W foils in fluoride-containing electrolytes at room temperature and under low applied voltages with an efficient growth rate of 2μmh−1. The maximum thickness of the films is ~3μm that exceeds those of previously reported anodized WO3 films in fluoride-containing electrolytes. By investigating the photocatalytic properties of the films with thicknesses ranging from ~0.5 to ~3μm, the optimum thickness of the nanoporous film is found to be ~1μm, which demonstrates an impressive 120% improvement in the photocatalytic performance compared to that of a RF-sputtered nanotextured film with similar weights. We mainly ascribe this to large surface area and smaller bandgap.
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