A key factor in the photoelectrochemical (PEC) performance of photoelectrodes is the efficient separation and transfer of photogenerated charges. Herein, a novel photoanode comprising three‐dimensional (3D) WO3 nanoplate@ZnO nanosheet hierarchical type‐II heterojunction arrays (3D WO3@ZnO HHAs) is designed and constructed via modification of the WO3 nanoplate arrays with ZnO nanosheets. The synthesized materials are characterized viaX‐ray diffraction (XRD), ultraviolet and visible spectrophotometry (UV–vis), scanning electon microscopy (SEM), transmission electron microscopy (TEM), and X‐ray photoelectron spectroscopy (XPS) analyses. Photoelectrochemical (PEC) test results reveal that the synthesized 3D WO3@ZnO HHAs photoanode exhibits reduced charge transfer resistance, improved electron‐hole pair life, and enhanced photocurrent density (≈4.5 times increase in comparison to that of the bare WO3). The increased light capture and high surface area in contact with the electrolyte as well as the enhanced charge transfer through the synergy between morphology and band structures may be responsible for the improved PEC characteristics.

中文翻译：

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ZnO 纳米片修饰的高效 WO3 纳米板阵列光阳极可增强电荷分离和转移，从而提高光电化学性能

光电极光电化学（PEC）性能的关键因素是光生电荷的有效分离和转移。在此，一种包含三维（3D）WO的新型光电阳极3纳米板@ZnO纳米片分层II型异质结阵列（3D WO3@ZnO HHAs）是通过修改 WO 来设计和构建的3具有 ZnO 纳米片的纳米板阵列。通过X射线衍射（XRD）、紫外和可见分光光度法（UV-vis）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线光电子能谱（XPS）分析对合成材料进行表征。光电化学（PEC）测试结果表明，合成的3D WO3@ZnO HHAs光阳极表现出降低的电荷转移电阻、改善的电子空穴对寿命和增强的光电流密度（与裸WO相比增加约4.5倍）3）。增加的光捕获和与电解质接触的高表面积以及通过形态和能带结构之间的协同作用增强的电荷转移可能是改善PEC特性的原因。