期刊
ELECTROCHIMICA ACTA
卷 192, 期 -, 页码 15-21出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.043
关键词
gold dendritic nanoforests; plasmonic catalysis; visible light enhanced; methanol oxidation; photo-electrochemical cells
资金
- Ministry of Science and Technology (MOST) of the Republic of China, Taiwan [MOST104-2221-E-492-001, MOST104-3113-E-007-002, MOST103-2923-E-007-001-MY3, MOST104-2221-E-492-034, MOST104-2623-E-492-001-ET]
Direct methanol fuel cells (DMFCs) are expected to play a central role in portable power source applications. However, the low efficiency of the methanol oxidation reaction (MOR) has limited their commercial use. To solve this issue, three-dimensional gold dendritic nanoforests (Au DNFs) were prepared to achieve photo-enhanced MOR at the DMFC anode. These approximately 1-mu m-thick silicon supported free-standing nanostructures were fabricated in 5 min under ambient conditions by a facile fluoride-assisted galvanic replacement reaction. Their catalytic performance and photo-enhancement toward MOR were investigated via cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. Clear catalytic activity enhancement and charge transfer resistance reduction were discovered under illumination. In addition, the chronoamperometric test showed that the oxidation current of MOR was boosted by 28% under broadband illumination. The optimal photoresponse was obtained at 700 nm. These results demonstrate the strong applicability of Au DNFs to photo electrochemical cells. Furthermore, the fabrication method provides a rapid bottom-up synthetic strategy for silicon-supported free-standing metallic nanostructures. (C) 2016 Elsevier Ltd. All rights reserved.
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