Spacing prior to decorating TiO2 nanowires with dewetted Au nanoparticles for boosting photoelectrochemical water oxidation,CrystEngComm

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Spacing prior to decorating TiO2 nanowires with dewetted Au nanoparticles for boosting photoelectrochemical water oxidation
CrystEngComm ( IF 2.6 ) Pub Date : 2021-08-10 , DOI: 10.1039/d1ce00886b
Yun Cai ₁ , Fengyu Yuan ₁ , Fan Li ₁ , Huihui Kang ₁ , Daxiang Xue ₁ , Siping Huo ₁ , Fengjiao Yu ₁ , Jun Fang ₁ , Yang Yang ₁

Affiliation

Au/TiO₂-based systems with the right combination of electronic configuration, structural dynamics, and stability have recently attracted wide attention in photoelectrochemical (PEC) water splitting for hydrogen generation. Here, we used the masking effect of Au nanoparticles that were dewetted from sputtered Au thin films to fabricate TiO₂ nanowire arrays with restricted planar coalescence on flat nucleation layers. The well-spaced vertically aligned TiO₂ nanowires allowed for effective coating of another Au thin film by sputtering. A further thermal dewetting process led to a uniform distribution of Au nanoparticles along the nanowire surface. When this sample was used as a photoanode for PEC water splitting, significantly increased photocurrent density and improved PEC activity toward water oxidation were achieved. Systematic electrochemical and PEC characterization demonstrated that the dual functions of the dewetted Au nanoparticles in regulation and surface passivation of TiO₂ nanowires were indispensable for the efficient generation, transfer, and separation of photogenerated charge carriers and the consequential boosted PEC water oxidation performance.

中文翻译：

用去湿的 Au 纳米粒子装饰 TiO2 纳米线之前的间距以促进光电化学水氧化

具有电子配置、结构动力学和稳定性的正确组合的基于Au/TiO ₂的系统最近在用于制氢的光电化学 (PEC) 水分解中引起了广泛关注。在这里，我们使用从溅射 Au 薄膜去湿的 Au 纳米颗粒的掩蔽效应来制造 TiO ₂纳米线阵列，在平面成核层上具有受限的平面聚结。间距良好的垂直排列的 TiO ₂纳米线允许通过溅射有效涂覆另一个金薄膜。进一步的热去湿过程导致 Au 纳米颗粒沿纳米线表面均匀分布。当该样品用作 PEC 水分解的光阳极时，实现了显着增加的光电流密度和改善的 PEC 对水氧化的活性。系统的电化学和 PEC 表征表明，去湿的 Au 纳米粒子在 TiO ₂纳米线的调节和表面钝化中的双重功能对于光生电荷载流子的有效产生、转移和分离以及随之而来的 PEC 水氧化性能的提高是必不可少的。

更新日期：2021-09-02

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