Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (12): 2132-2140.DOI: 10.1016/S1872-2067(17)62948-6

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Nanotube array-like WO3/W photoanode fabricated by electrochemical anodization for photoelectrocatalytic overall water splitting

Lingfeng Li, Xiaolong Zhao, Donglai Pan, Guisheng Li   

  1. Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, College of Life and Environmental Science, Shanghai Normal University, Shanghai 200234, China
  • Received:2017-10-09 Revised:2017-10-27 Online:2017-12-18 Published:2017-12-29
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21207090, 21477079, 21261140333), PCSIRT (IRT1269), and a scheme administrated by Shanghai Normal University (DXL122, and S30406).

Abstract:

Photoactive WO3 is attractive as a photocatalyst for green energy evolution through water splitting. In the present work, an electrochemical anodic oxidation method was used to fabricate a photo-responsive nanotube array-like WO3/W (NA-WO3/W) photoanode from W foil as a precursor. Compared with a reference commercial WO3/W electrode, the NA-WO3/W photoanode exhibited enhanced and stable photoelectrocatalytic (PEC) activity for visible-light-driven water splitting with a typical H2/O2 stoichiometric ratio of 2:1 and quantum efficiency of approximately 5.23% under visible-light irradiation from a light-emitting diode (λ=420 nm, 15 mW/cm2). The greatly enhanced PEC performance of the NA-WO3/Wphotoanode was attributed to its fast electron-hole separation rate, which resulted from the one-dimensional nanotube array-like structure, high crystallinity of monoclinic WO3, and strong interaction between WO3 and W foil. This work paves the way to a facile route to prepare highly active photoelectrodes for solar light transfer to chemical energy.

Key words: WO3, W foil, Electrochemical anodization, Nanotube arrays, Photoelectrocatalysis, Water splitting