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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Solar-driven plasmonic heterostructure Ti/TiO2-x with gradient doping for sustainable plasmon-enhanced catalysis
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Solar-driven plasmonic heterostructure Ti/TiO2-x with gradient doping for sustainable plasmon-enhanced catalysis

机译：太阳能驱动等离子体异质结构TI / TiO2-X，具有梯度掺杂可持续等离子体增强催化

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摘要

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/TiO2-x. The heterostructure was fabricated by engineering an intense coupling of a surface-etched Ti metal and a gradient-based TiO2-x dielectric via diffusion doping. Ti/TiO2-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 TiO2-x dielectric accelerates the transfer of solar energy to charge carriers for plasmon-enhanced water splitting reactions. Moreover, the plasmonic Ti/TiO2-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.
机译：等离子体增强的光子收获有助于光化学转换和太阳能储存。然而，高依赖性对贵金属和异质结构弱耦合限制了可持续等离子体增强的进展。这里研究了地球丰富的Ti，以实现太阳能驱动异质结构Ti / TiO2-x中的催化活性的等离子体增强。通过扩散掺杂来工程通过工程表面蚀刻的Ti金属和梯度基TiO2-X电介质的强耦合来制造异质结构。 Ti / TiO2-X表现出与表面等离子体共振相关的高谐振光吸收带，其表现出强大的近场增强（NFE）和热电子注入效果。在光电化学系统中，谐振等离子体具有邻近TiO2-x电介质的强烈相互作用加速了太阳能的转移到用于等离子体增强的水分裂反应的载量。此外，等离子体Ti / TiO2-X结构具有超过100小时的持续增强的氧化还原活性。梯度掺杂的强烈耦合提供了一种有效的方法，以使得通过可见光激发的TI的等离子体共振。基于TI的血浆异质结构可能打开可持续的等离子体增强催化的替代途径。

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