The hole oxidation of Bi₂WO₆ occurs on Bi or O sites, thus, enhancing the proportion of {001} facets of Bi₂WO₆ in photocatalysis has received increased attention because of its promotion of the hole oxidation. In this work, we successfully fabricated {001} facets highly exposed Bi₂WO₆ nanoplate arrays (Bi₂WO₆ NAs) photoelectrode growing on indium tin oxides (ITO) substrate in situ. After electrochemical deposition of NiFe-layered double hydroxide (LDH) on Bi₂WO₆ NAs, NiFe−LDH/Bi₂WO₆ NAs photoelectrode was also obtained for the first time. Bi₂WO₆ with a large proportion of {001} facets facilitate the photocatalytic oxidation reactions, and NiFe−LDH can induce photogenerated holes transfer from Bi₂WO₆ to NiFe−LDH simultaneously. The NiFe−LDH/Bi₂WO₆ NAs photoelectrode presents superior photoelectrochemical properties than pure Bi₂WO₆ NAs photoelectrode, which was characterized by transient photocurrent and electrochemical impedance spectroscopy (EIS) systematically. Taking bisphenol A (BPA) as a model pollutant, the NiFe−LDH/Bi₂WO₆ NAs photoelectrode exhibits much higher photocatalytic (PC) and photoelectrocatalytic (PEC) degradation activity than Bi₂WO₆ NAs photoelectrode. The PEC degradation rate of NiFe−LDH/Bi₂WO₆ NAs photoelectrode is 2.1 times and 4.7 times that of Bi₂WO₆ NAs photoelectrode under simulated solar light illumination and visible light illumination, respectively. This work proposes a new approach to construct highly efficient photoelectrode for contaminant purification.

中文翻译：

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在 ITO 玻璃上支撑具有定向 {001} 小面的 NiFe 层状双氢氧化物/垂直 Bi2WO6 纳米板阵列：改进的光电催化活性和机理洞察

Bi ₂ WO ₆的空穴氧化发生在Bi或O位点上，因此提高Bi ₂ WO ₆的{001}面在光催化中的比例因其促进空穴氧化而受到越来越多的关注。在这项工作中，我们成功地制造了原位生长在氧化铟锡（ITO）衬底上的{001}面高度暴露的Bi ₂ WO ₆纳米板阵列（Bi ₂ WO ₆ NAs）光电极。在 Bi ₂ WO ₆ NAs上电化学沉积 NiFe 层状双氢氧化物 (LDH) 后，NiFe-LDH/Bi ₂ WO ₆NAs光电极也是首次获得。具有大比例{001}面的Bi ₂ WO ₆促进了光催化氧化反应，并且NiFe-LDH可以同时诱导光生空穴从Bi ₂ WO ₆转移到NiFe-LDH。NiFe-LDH/Bi ₂ WO ₆ NAs 光电极表现出优于纯 Bi ₂ WO ₆ NAs 光电极的光电化学性能，其系统地通过瞬态光电流和电化学阻抗谱（EIS）表征。以双酚 A (BPA) 作为模型污染物，NiFe-LDH/Bi ₂ WO ₆NAs 光电极比Bi ₂ WO ₆ NAs 光电极表现出更高的光催化（PC）和光电催化（PEC）降解活性。由NiFe-LDH / Bi的PEC降解速率₂ WO ₆的NA光电极是铋的2.1倍和4.7倍₂ WO ₆分别下模拟太阳光照和可见光照明的NAS光电极。这项工作提出了一种构建用于污染物净化的高效光电极的新方法。