https://scholars.lib.ntu.edu.tw/handle/123456789/629434
標題: | Gold/Platinum nanosponges for electrocatalytic oxidation of methanol | 作者: | ZONG-HONG LIN Shih, ZY Tsai, HY HUAN-TSUNG CHANG |
關鍵字: | FACILE SYNTHESIS; TEMPERATURE SYNTHESIS; HYDROGEN ACTIVATION; GOLD NANOPARTICLES; METAL NANOCRYSTALS; CARBON NANOTUBES; PLATINUM; ALLOY; ELECTROOXIDATION; NANOWIRES | 公開日期: | 2011 | 出版社: | ROYAL SOC CHEMISTRY | 卷: | 13 | 期: | 4 | 起(迄)頁: | 1029 | 來源出版物: | GREEN CHEMISTRY | 摘要: | We have prepared Aun/Pt nanosponges that are highly electroactive for the oxidation of MeOH, from Pt nanosponges and AuCl4− ions through galvanic reactions at ambient temperature and pressure. At AuCl4− concentrations of 0, 0.1, 0.3, 0.5, 1.0, and 2.0 mM and a constant content of Pt nanosponges, we obtained Aun/Pt nanosponges having values of n of 0, 0.1, 0.2, 0.3, 0.5, and 0.8, respectively. The average size of the Au nanoparticles deposited on the surfaces of the Pt nanosponges increased upon increasing the AuCl4− concentration (at a constant Pt nanosponge content). We used UV–Vis absorption spectroscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, inductively coupled plasma mass spectrometry, and transmission electron microscopy to characterize the as-prepared Aun/Pt nanosponges. These techniques revealed that the Aun/Pt nanosponges comprised spherical Au nanoparticles (diameter: 6–17 nm) and assemblies of Pt nanorods (width: 3 nm; length: 17 nm). Cyclic voltammetry indicated that the electrocatalytic oxidation of MeOH was dependent on the content of Au nanoparticles on the surfaces of the Pt nanosponges. The Au0.5/Pt nanosponges provided the highest electrocatalytic efficiency—indeed, it was superior to those of commercial Pt nanoparticles and other previously reported Pt nanosponges. The Au0.5/Pt nanosponges exhibited a mass activity of 231 mA mg−1 and a forward-to-reverse anodic peak current ratio of 2.2—i.e., excellent electrocatalytic activity for the oxidation of MeOH. © 2011 The Royal Society of Chemistry. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/629434 | ISSN: | 1463-9262 | DOI: | 10.1039/c0gc00648c |
顯示於: | 醫學工程學研究所 |
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