WO₃@α-Fe₂O₃ Heterojunction Arrays with Improved Photoelectrochemical Behavior for Neutral pH Water Splitting

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• 作者：Yuan Li ; Lihan Zhang ; Ruirui Liu ; Zhen Cao ; Prof. Xiaoming Sun ; Dr. Xijun Liu and Prof. Jun Luo
• 刊名：ChemCatChem
• 出版年：2016
• 出版时间：September 7, 2016
• 年：2016
• 卷：8
• 期：17
• 页码：2765-2770
• 全文大小：1618K
• ISSN：1867-3899

文摘

Photoelectrochemical (PEC) water splitting on illuminated semiconductors plays an increasing role in alternative energy devices because of the need for clean and sustainable energy. However, the overall efficiency of the process is still very low and requires further improvement for widespread application. Herein, we report that the PEC performance of WO₃ can be optimized by constructing a WO₃@α-Fe₂O₃ heterojunction nanosheet array to expand the spectral range of light absorption and promote photogenerated electron–hole separation/transfer. This heterojunction photoanode exhibit a pronounced photocurrent response of 1.66 mA cm⁻², a high incident photon-to-current conversion efficiency of ∼73.7 % at 390 nm, and an excellent photostability of 100 %, all at 1.23 V versus reversible hydrogen electrode. Therefore, our approach has great potential for designing efficient hybrid photoanodes for PEC water-splitting systems.