Solar-driven plasmonic heterostructure Ti/TiO2−x with gradient doping for sustainable plasmon-enhanced catalysis,Physical Chemistry Chemical Physics

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Solar-driven plasmonic heterostructure Ti/TiO2−x with gradient doping for sustainable plasmon-enhanced catalysis
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2020/03/16 , DOI: 10.1039/d0cp00672f
Chaoqun Cheng _{1,

2,

3,

4} , Muhammad Nadeem Akram _{1,

2,

3,

4} , Ola Nilsen _{4,

5,

6,

7} , Nini Pryds _{8,

9,

10,

11} , Kaiying Wang _{1,

2,

3,

4}

Affiliation

Plasmon-enhanced harvesting of photons has contributed to the photochemical conversion and storage of solar energy. However, high dependence on noble metals and weak coupling in heterostructures constrain the progress towards sustainable plasmonic enhancement. Here earth-abundant Ti is studied to achieve the plasmonic enhancement of catalytic activity in a solar-driven heterostructure Ti/TiO_2−x. The heterostructure was fabricated by engineering an intense coupling of a surface-etched Ti metal and a gradient-based TiO_2−x dielectric via diffusion doping. Ti/TiO_2−x exhibits a highly resonant light absorption band associated with surface plasmon resonances that exhibit strong near-field enhancement (NFE) and hot electron injection effects. In a photoelectrochemical system, intense interaction of the resonant plasmons with a vicinal TiO_2−x dielectric accelerates the transfer of solar energy to charge carriers for plasmon-enhanced water splitting reactions. Moreover, the plasmonic Ti/TiO_2−x structure presents sustained enhanced redox activities over 100 h. The intense coupling by gradient doping offers an effective approach to enable the plasmon resonances of Ti excited by visible light. The Ti-based plasmonic heterostructure potentially opens an alternative avenue towards sustainable plasmon-enhanced catalysis.

中文翻译：

梯度掺杂的太阳能驱动等离子异质结构Ti / TiO2-x可持续的等离激元增强催化

等离子体增强光子的收获促进了光化学转化和太阳能的存储。但是，对贵金属的高度依赖和异质结构中的弱耦合限制了向可持续等离子体增强的进展。在这里，研究了地球上富集的Ti，以实现太阳能驱动的异质结构Ti / TiO _{2- x中}等离子体活性的等离子体增强。异质结构是通过扩散掺杂对表面蚀刻的Ti金属和基于梯度的TiO ₂ - _x电介质进行强耦合而制成的。Ti / TiO _{2− x}具有与表面等离振子共振相关的高共振光吸收带，具有强的近场增强（NFE）和热电子注入效应。在光电化学系统中，共振等离子体激元与邻近的TiO _{2- x}电介质的强烈相互作用加速了太阳能向等离子体激元增强水分解反应的电荷载流子的转移。此外，等离子Ti / TiO _{2- x}结构在100小时内呈现出持续增强的氧化还原活性。通过梯度掺杂的强耦合提供了一种有效的方法，以使可见光激发的Ti的等离子体激元共振。钛基等离激元异质结构潜在地为可持续的等离激元增强催化开辟了另一条途径。

更新日期：2020-04-15

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