Enhanced Photocatalytic Activity of WS Film by Laser Drilling to Produce Porous WS/WO Heterostructure.

Methods and mechanisms for improvement of photocatalytic activity, are important and popular research topics for renewable energy production and waste water treatment. Here, we demonstrate a facile laser drilling method for engineering well-aligned pore arrays on magnetron-sputtered WS nanofilms with increased active edge sites; the proposed method promotes partial oxidation to fabricate WS/WO heterojunctions that enhance the separation of photogenerated electron-hole pairs. The WS film after one, two, and three treatments exhibited photocurrent density of 3.