Hierarchical TiO2 nanowire/microflower photoanode modified with Au nanoparticles for efficient photoelectrochemical water splitting†,Catalysis Science & Technology

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Hierarchical TiO2 nanowire/microflower photoanode modified with Au nanoparticles for efficient photoelectrochemical water splitting†
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2018-01-26 00:00:00 , DOI: 10.1039/c7cy02641b
Yanyan Duan _{1,

2,

3,

4,

5} , Shaochen Zhou _{1,

2,

3,

4,

5} , Zhihong Chen _{6,

7,

8} , Jianmin Luo _{1,

2,

3,

4,

5} , Mei Zhang _{1,

2,

3,

4,

5} , Fu Wang _{1,

2,

3,

4,

5} , Tao Xu _{9,

10,

11,

12} , Chuanyi Wang _{1,

2,

3,

4,

5}

Affiliation

An efficient photoelectrochemical water splitting system is developed based on a hierarchical TiO₂ nanowire/microflower (H-TiO₂) photoanode, which is synthesized via a one-step hydrothermal process. The H-TiO₂ structure is formed via three primary self-assembly processes and simultaneously offers excellent ultraviolet light absorption capacity and large specific surface area. The H-TiO₂ photoanode achieves a 1.3 fold enhancement in photocurrent density compared to its TiO₂ nanowire-based counterpart at 1.23 V vs. reversible hydrogen electrode (the theoretical potential for water electrolysis). More strikingly, by incorporating the surface plasmon resonance (SPR) effect from Au nanoparticles (NPs), the resulting Au/H-TiO₂-based photoanodes (Au/H-TiO₂) exhibit an about two-fold enhancement in photocurrent density under both simulated sunlight and visible-light illumination. Moreover, the maximum photoconversion efficiency of Au/H-TiO₂ gives three fold enhancement compared to that in the absence of Au NPs. Significantly, Au NPs incorporated on the H-TiO₂ surface also serve as co-catalysts like Pt under white-light illumination, reducing the onset potential by about 0.15 V and the current saturation potential by about 0.18 V. The enhanced photoactivity under white light is due to the co-action of electron transfer from the efficient carrier separation of H-TiO₂ (ultraviolet part) and Au to H-TiO₂ under the SPR effect (visible part). The present study provides a new strategy for designing and fabricating TiO₂-based devices with favorable energy conversion efficiency for photoelectrochemical water splitting.

中文翻译：

Au纳米粒子修饰的 TiO ₂纳米线/微花光阳极，用于有效的光电化学水分解†

基于分级的TiO ₂纳米线/微光（H-TiO ₂）光电阳极，开发了一种高效的光电化学水分解系统，该光电阳极是通过一步水热法合成的。H-TiO ₂结构是通过三个主要的自组装过程形成的，同时具有出色的紫外线吸收能力和较大的比表面积。在1.23 V vs. H. TiO ₂纳米线的基础上，H-TiO ₂光电阳极的光电流密度提高了1.3倍。可逆氢电极（水电解的理论电位）。更惊人的是，通过并入Au纳米颗粒（NPs）的表面等离振子共振（SPR）效应，所得的Au / H-TiO ₂基光阳极（Au / H-TiO ₂）在光强下的光电流密度提高了约两倍。模拟日光和可见光照明。此外，与不存在Au NPs相比，Au / H-TiO ₂的最大光转换效率提高了三倍。值得注意的是，Au NPs掺入了H-TiO _2中在白光照射下，表面也可以用作助催化剂，例如Pt，可将起始电势降低约0.15 V，将电流饱和电势降低约0.18V。白光下增强的光活性是由于来自H-TiO 2的高效率载体分离₂（紫外线部分）和Au到H-的TiO ₂下SPR效应（可见部分）。本研究提供了一种新的策略，用于设计和制造具有良好能量转换效率的TiO ₂基器件，用于光电化学水分解。

更新日期：2018-01-26

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