Self‐Assembled Urchin‐Like CuWO4/WO3 Heterojunction Nanoarrays as Photoanodes for Photoelectrochemical Water Splitting,ChemElectroChem

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Self‐Assembled Urchin‐Like CuWO4/WO3 Heterojunction Nanoarrays as Photoanodes for Photoelectrochemical Water Splitting
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-11-02 , DOI: 10.1002/celc.202001154
Tao Wang ₁ , Xiaoli Fan ₂ , Bin Gao ₁ , Cheng Jiang ₁ , Yang Li ₁ , Peng Li ₁ , Songtao Zhang ₃ , Xianli Huang ₁ , Jianping He ₁

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With attractive visible‐light response and chemical stability, CuWO₄ has emerged to be a promising candidate as a photoanode for photoelectrochemical (PEC) water oxidation. In this work, we report a one‐step hydrothermal method to prepare CuWO₄‐based films directly grown on a conductive glass substrate from a stable precursor solution. By controlling the reaction duration, CuWO₄/WO₃ heterojunctions with urchin‐like nanoarray morphology are obtained. The CuWO₄/WO₃ film obtained with an optimized hydrothermal reaction time exhibits an onset potential of 0.6 V and a photocurrent density of 0.48 mA cm⁻² at 1.23 V vs. RHE, which is almost five times that of bare CuWO₄. The superior structure of the urchin‐like array with large surface area, optimizing film thickness for adequate light absorption and formation of heterojunctions for efficient charge separation conjointly, contributes to the improved performance as well as robust stability.

中文翻译：

自组装的Urchin类CuWO4 / WO3异质结纳米阵列作为光阳极用于光电化学水分解

具有诱人的可见光响应和化学稳定性，CuWO ₄成为光电化学（PEC）水氧化的光阳极成为有希望的候选者。在这项工作中，我们报告了一种一步式水热法，以从稳定的前体溶液制备直接在导电玻璃基板上生长的基于CuWO ₄的薄膜。通过控制反应时间，可以获得具有Urchin样纳米阵列形态的CuWO ₄ / WO ₃异质结。以优化的水热反应时间获得的CuWO ₄ / WO ₃膜的起始电位为0.6 V，光电流密度为0.48 mA cm ^-2在1.23 V与RHE相比，几乎是裸CuWO _4的五倍。具有大表面积的urchin状阵列的优越结构，可优化膜厚度以实现足够的光吸收，并形成异质结以有效地进行电荷分离，从而有助于提高性能并增强稳定性。

更新日期：2021-01-04

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