An electrochemical study involving the pulse electrodeposition of platinum onto p-type silicon nanowires array in non-fluoride solution for photo enhanced electrochemical hydrogen generation is presented. Pt was deposited onto the surface of silicon nanowires array (light trapping layer) as a photocatalyst with a radial multi-layers nanocluster structure, of which the photocurrent density of hydrogen generated was increased by about 300% compared to the bare silicon nanowires array under simulated solar radiance, while the value of onset potential also positively shifted to 0.40 V. Furthermore, the impedance of Pt/silicon nanowires array was smaller than that of bare silicon nanowires array as indicated by EIS analysis. We tentatively ascribed the mechanism of enhancement to the effect of the Schottky junction at the Pt/silicon nanowires array interface. (C) 2014 The Electrochemical Society. All rights reserved.