Two-Dimensional Long-Plate SnWO 4 Photoanode Exposed Active Facets for Enhanced Solar Water Splitting

作者：Weixin Qiu, Yanfang Zhang, Gaoshuang He, Long Chen, Keke Wang, Qingmei Wang, Wenzhang Li, Yang Liu, Jie Li · 发表于：ACS Applied Energy Materials · 年份：2022 · DOI：10.1021/acsaem.2c02235 · 被引用次数：16 · 研究领域：Advanced Photocatalysis Techniques、Gas Sensing Nanomaterials and Sensors、Ga2O3 and related materials

α-SnWO 4 is a potential catalyst for photoelectrochemical (PEC) water splitting with its narrow band gap and suitable band position, while its PEC performance is restricted by poor carrier transport ability. Herein, morphology control together with facet engineering as a strategy is used to optimize the carrier transport of the SnWO 4 film photoanode. In this paper, a two-dimensional (2D) long-plate structure for the SnWO 4 film was obtained from a rod-like WO 3 film due to the inherited behavior of the morphology, and the added fluoride ions (F – ) further smoothed the surface of α-SnWO 4 and increased the proportion of active facets. As a result, 2D SnWO 4 with favorable facets presents ∼0.79 mA/cm 2 at 1.23 V vs reversible hydrogen electrode (RHE) in KPi without any sacrificial agent, which is much larger than the SnWO 4 film (0.26 mA/cm 2 ) transformed from plane WO 3 without structure-directing agents. We believe this work provides a pathway to design ternary metal oxide-based nanostructured film electrodes.