Fabrication and photoelectrochemical properties of nanoporous WO<inf>3</inf> film

Nanoporous tungsten oxide (WO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) with pore size of about 80 nm has been fabricated by anodization in a 1 M Na <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> SO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> solution with 0.5 wt% NaF (pH 4.0) at the anodization voltage of 40 V. The photoelectrochemical properties and photocatalytic activity of the nanoporous WO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> film are investigated under visible light. The results show that the WO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> nanoporous structure has better photoactivity than the plane structure under visible light irradiation and is a potential photocatalyst to decompose contamination in water under visible light.