Xu Xiaoxiao, Fang Caihong, Bi Ting, Cui Zhiqing, Zhao Guili, Jiang Xiaomin, Hu Jinwu
College of Chemistry and Materials Science, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Center for Nano Science and Technology, Key Laboratory of Electrochemical Clean Energy of Anhui Higher, Education Institutes, Anhui Normal University, Wuhu, 241000, P. R. China.
Chemistry. 2020 Aug 21;26(47):10787-10794. doi: 10.1002/chem.202001187. Epub 2020 Jul 27.
Plasmonic nanostructures with large absorption areas under resonant excitation have been utilized extensively in photon-assisted applications. In this work, dodecahedral Au nanobowls were first prepared by an easy and template-free method only through the introduction of H PtCl and I during the growth procedure. The Au nanobowls show electron-field enhancement due to the high curvature of the bowl edge, the open region, and dodecahedral morphology. Au/Pt nanobowls, which couple plasmonic Au and catalytic Pt, were then constructed as plasmonic electrocatalysts for methanol oxidation. The mass activity reached 497.6 mA mg under visible-light illumination, which is 1.9 times that measured in the dark. Simultaneously, the electrocatalytic stability is also greatly improved under light excitation. The enhanced properties of the plasmonic Au/Pt electrocatalysts are ascribed to the synergistic effect of the plasmon-enhanced photothermal and hot-carrier effects on the basis of experimental investigations. This work thus offers an effective methodology to construct efficient plasmonic electrocatalysts for fuel cells.
具有在共振激发下大吸收面积的等离子体纳米结构已被广泛应用于光子辅助应用中。在这项工作中，仅通过在生长过程中引入H₂PtCl₆和KI，首次采用一种简便的无模板方法制备了十二面体金纳米碗。由于碗边缘的高曲率、开放区域和十二面体形态，金纳米碗表现出电场增强。然后，将耦合等离子体金和催化铂的金/铂纳米碗构建为用于甲醇氧化的等离子体电催化剂。在可见光照射下，质量活性达到497.6 mA mg⁻¹，是在黑暗中测量值的1.9倍。同时，在光激发下电催化稳定性也大大提高。基于实验研究，等离子体金/铂电催化剂的增强性能归因于等离子体增强光热效应和热载流子效应的协同作用。因此，这项工作提供了一种构建高效燃料电池等离子体电催化剂的有效方法。
