WO3/TiO2 nanotube array electrode was fabricated by incorporating WO3 with TiO2 nanotube array via a wet impregnation method using ammonium tungstate as the precursor. TiO2 and WO3/TiO2 nanotube arrays were characterized by field emission SEM, X-ray diffraction, and energy dispersive X-ray anal. In order to characterize the photoelectrochem. properties of WO3/TiO2 electrode, electrochem. impedance spectroscopy, and steady-state photocurrent (iss) measurement at a controlled potential were performed in the supporting electrolyte contg. different concns. of glucose. The photoelectrochem. characterization results reveal that WO3/TiO2 nanotube array electrode possesses a much higher sepn. efficiency of the photogenerated electron-hole pairs and could generate more photoholes on the electrode surface compared with the pure TiO2 nanotube array electrode. The iss for glucose oxidn. at WO3/TiO2 nanotube array electrode is much higher than that at the pure TiO2 nanotube array electrode.