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Advances in Condensed Matter Physics
Volume 2014, Article ID 970891, 5 pages
http://dx.doi.org/10.1155/2014/970891
Research Article

Diffusion-Controlled Growth of Oxygen Bubble Evolved from Nanorod-Array TiO2 Photoelectrode

State Key Laboratory of Multiphase Flow in Power Engineering, International Research Center for Renewable Energy, Xi’an Jiaotong University, Shaanxi 710049, China

Received 28 March 2014; Accepted 8 May 2014; Published 25 May 2014

Academic Editor: Haimin Zhang

Copyright © 2014 Xiaowei Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanorod-array structure gains its popularity in photoelectrode design for water splitting. However, the structure’s effects on solid-liquid interface interaction and reaction product transportation still remain unsolved. Gas bubble generally evolved from photoelectrodes, which provides a starting point for the problem-solving. Based on this, investigations on the gas-evolving photoelectrode are carried out in this paper. By experimental studies of wettability on the photoelectrode nanorod-array surface and oxygen bubble growth from anode, we analyzed the interaction affecting the gas-solid-liquid contact behaviors and product transportation mechanism, which is controlled by diffusion due to the concentration gradient of dissolved gases in the aqueous electrolyte and the microconvection caused by the bubble interface movement. In the end, based on the bubble growth characteristics of in the experiment, a model describing the product transport mechanism was presented.