Synthesis of Tungsten Oxide Nanorods by the Controlling Precipitation Reaction: Application for Hydrogen Evolution Reaction on a WO₃ Nanorods/Carbon Nanotubes Composite Film Modified Electrode

Tungsten trioxide nanorods (WO 3 ) were prepared by controlling the precipitation reaction of sodium tungstate dehydrates solution and hydrothermal process. The synthesized tungsten trioxide nanorods have been characterized by X‐ray diffraction (XRD), energy dispersive spectroscopy (EDS), scanning electron microscopy (SEM), cyclic voltammetry (CV) and linear sweep voltammetry (LSV). Electrochemical activity for hydrogen evolution reaction (HER) on WO 3 nanorods / carbon nanotube (WO 3 /CNT) composite electrocatalyst was first studied in acid solution (0.1 M H 2 SO 4 ) at room temperature. The overall experimental results revealed that the electrocatalytic activity for HER on WO 3 /CNT is two order magnitude higher than those obtained with WO 3 nanorods and is four times than in the case of commercial WO 3 in 0.1 M H 2 SO 4 . On the other hand, the kinetic reaction mechanisms were discussed on WO 3 /CNT electrocatalysts in acid solution for HER. However, the rate‐determining step carries through Tafel reaction on commercial WO 3 , CNT, WO 3 nanorods and WO 3 /CNT electrocatalysts in acidic solution was introduced.