Enhanced Visible Light Activity of Single-Crystalline WO3 Microplates for Photoelectrochemical Water Oxidation

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• 作者：Mira Park ; Jong Hyeok Seo ; Hyunjoon Song ; Ki Min Nam
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：May 5, 2016
• 年：2016
• 卷：120
• 期：17
• 页码：9192-9199
• 全文大小：543K
• 年卷期：0
• ISSN：1932-7455

文摘

The preparation of metal oxides on a conductive substrate has been an important issue for improving photoelectrochemical water splitting efficiency. In this work, a facile synthetic process is reported for single-crystalline WO₃ microplates with variable thicknesses grown directly on a fluorine-doped tin oxide substrate followed by an annealing procedure. The WO₃ microplate electrode showed an improved photocurrent under 1 sun irradiation (1.9 mA/cm² at 0.6 V vs Ag/AgCl, 100 mW/cm²) for water oxidation, including a significant enhancement in the visible light region compared to either a nanoparticle or a bulk film electrode. The enhanced water oxidation activity originates from both the single crystallinity with an optimum thickness and the oxygen-deficient characteristic of the WO₃ microplates. To improve the photochemical stability, FeOOH electrocatalysts were deposited on the surfaces of the WO₃ microplates. The resulting WO₃/FeOOH composite electrode showed enhanced stability for water oxidation reactions.