Highly Ordered Periodic Au/TiO₂ Hetero-Nanostructures for Plasmon-Induced Enhancement of the Activity and Stability for Ethanol Electro-oxidation.
Highly Ordered Periodic Au/TiO₂ Hetero-Nanostructures for Plasmon-Induced Enhancement of the Activity and Stability for Ethanol Electro-oxidation.
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DOI：
10.1021/acsami.5b11259
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发表时间：
2016-02
影响因子：
9.5
通讯作者：
Zhao Jin;Qiyu Wang;W. Zheng;X. Cui
中科院分区：
文献类型：
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作者：
Zhao Jin;Qiyu Wang;W. Zheng;X. Cui
乙醇催化电氧化是直接乙醇燃料电池（DAFCs）在替代能源领域的核心技术，因为它能够将乙醇的化学能直接转化为电能。开发高效、稳定、具有抗中毒能力的乙醇电氧化电极材料仍然是一个挑战。采用两步阳极氧化法制备了高有序周期au纳米粒子修饰的双层TiO2纳米管（BTNT）杂碳结构。Au/TiO2电极异质界面上等离子体诱导的电荷分离提高了可见光下乙醇氧化的电催化活性和稳定性。与普通的Au - nps修饰的单层TiO2纳米管（MTNT）相比，电极表面高度有序的周期性异质结构增强了光收获，使其在辐照下具有更好的乙醇电氧化性能。这种新型Au/TiO2电极在可见光下也表现出自清洁性能，这是由于吸附中间体的电氧化增强。这种光驱动电化学性能的增强为DAFCs的设计和构建提供了发展策略。
The catalytic electro-oxidation of ethanol is the essential technique for direct alcohol fuel cells (DAFCs) in the area of alternative energy for the ability of converting the chemical energy of alcohol into the electric energy directly. Developing highly efficient and stable electrode materials with antipoisoning ability for ethanol electro-oxidation remains a challenge. A highly ordered periodic Au-nanoparticle (NP)-decorated bilayer TiO2 nanotube (BTNT) heteronanostructure was fabricated by a two-step anodic oxidation of Ti foil and the subsequent photoreduction of HAuCl4. The plasmon-induced charge separation on the heterointerface of Au/TiO2 electrode enhances the electrocatalytic activity and stability for the ethanol oxidation under visible light irradiation. The highly ordered periodic heterostructure on the electrode surface enhanced the light harvesting and led to the greater performance of ethanol electro-oxidation under irradiation compared with the ordinary Au NPs-decorated monolayer TiO2 nanotube (MTNT). This novel Au/TiO2 electrode also performed a self-cleaning property under visible light attributed to the enhanced electro-oxidation of the adsorbed intermediates. This light-driven enhancement of the electrochemical performances provides a development strategy for the design and construction of DAFCs.