All-Solution-Processed WO3/BiVO4 Core-Shell Nanorod Arrays for Highly Stable Photoanodes
All-Solution-Processed WO3/BiVO4 Core-Shell Nanorod Arrays for Highly Stable Photoanodes
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DOI：
10.1021/acsami.9b03712
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发表时间：
2019-06-05
影响因子：
9.5
通讯作者：
Jang, Ho Won
中科院分区：
文献类型：
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作者：
Lee, Bo Reum;Lee, Mi Gyoung;Jang, Ho Won
氧化钨 (WO3) 和钒酸铋 (BiVO4) 是构建用于光电化学 (PEC) 应用的高效异质结的最具吸引力的组合之一。在这里，我们报告了一种全溶液处理的 WO3/BiVO4 异质纳米结构光阳极，其具有高度增强的光活性和稳定性，可实现可持续能源生产。通过水热法在氟掺杂氧化锡/玻璃基板上合成了垂直排列的 WO3 纳米棒，无需种子层，并通过脉冲电沉积沉积 BiVO4 进行保形涂层。由于WO3纳米棒中载流子的长扩散长度、吸收更宽范围波长的能力以及用于自发PEC反应的WO3/BiVO4异质结的适当带边位置，最佳WO3/BiVO4光电阳极在1.23V vs RHE下的光电流密度为4.15mA/cm(2)，在1.23V下的入射光子电流效率为75.9%。正面照明下的波长为 430 nm，分别是原始 WO3 纳米棒阵列的两倍和四倍。我们的工作提出了一种环境友好且低成本的全解决方案工艺路线来合成高质量的光电极。
Tungsten oxide (WO3) and bismuth vanadate (BiVO4) are one of the most attractive combinations to construct an efficient heterojunction for photoelectrochemical (PEC) applications. Here, we report an all-solution-processed WO3/BiVO4 heteronanostructure photoanode with highly enhanced photoactivity and stability for sustainable energy production. The vertically aligned WO3 nanorods were synthesized on a fluorine-doped tin oxide/glass substrate by the hydrothermal method without a seed layer and BiVO4 was deposited by pulsed electrodeposition for conformal coating. Owing to the long diffusion lengths of charge carriers in the WO3 nanorods, the ability to absorb the wider range of wavelengths, and appropriate band-edge positions of the WO3/BiVO4 heterojunction for spontaneous PEC reaction, the optimum WO3/BiVO4 photoanode has a photocurrent density of 4.15 mA/cm(2) at 1.23 V versus RHE and an incident-photon-to-current efficiency of 75.9% at 430 nm under front illumination, which are a double and quadruple those of pristine WO3 nanorod arrays, respectively. Our work suggests an environment-friendly and low-cost all-solution process route to synthesize high-quality photoelectrodes.