Controlling the Structure and Photoelectrochemical Performance of BiVO4 Photoanodes Prepared from Electrodeposited Bismuth Precursors: Effect of Zinc Ions as Directing Agent

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• 作者：Wanhong He ; Ruirui Wang ; Chen Zhou ; Junjiao Yang ; Feng Li ; Xu Xiang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：54
• 期：43
• 页码：10723-10730
• 全文大小：478K
• ISSN：1520-5045

文摘

A facile and green method was developed to control the structure of the prevailing BiVO₄ photoanodes derived from electrodeposited Bi precursors, in which Zn²⁺ ions were added as a directing agent to tune the deposition of Bi particles. The particle size and density of the Bi precursors were affected by the amount (or concentration) of Zn²⁺ ions added. The structural evolution of BiVO₄ was consistent with that of the Bi precursor particles. An optimal concentration of Zn²⁺ ions resulted in smaller particle sizes and produced appropriate interparticle spacing of BiVO₄ photoanodes, which possessed enhanced photocurrent and improved charge separation efficiency. The enhancement is mostly ascribed to the suppression of carrier recombination in the bulk. This work demonstrates an effective way to adjust the structure and the subsequent photoelectrochemical performance of BiVO₄ photoanodes by a cation-tuned Bi precursor strategy without the use of hard templates or complex directing agents.