Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7705498 | International Journal of Hydrogen Energy | 2018 | 8 Pages |
Abstract
Homogeneously distributed PtAu nanoalloy anchored to graphene (PtAuNA/G) was synthesized via a simple one-step electrochemical deposition process, in which Pt and Au ions and graphene oxide was simultaneously electro-reduced on the glassy carbon electrode. The morphology evolution of PtAuNA/G synthesized with different deposition times was characterized via field-emission scanning electron microscopy. X-ray diffraction and transmission electron microscopy was applied to confirm the alloy structure. The electrodeposition conditions, including the deposition time, were further optimized to explore the morphological evolution of PtAuNA/G. Based on cyclic voltammetry and chronoamperometry results, it was found that PtAuNA/G can efficiently catalyze the oxidation of methanol in alkaline media with dramatically enhanced electrocatalytic activity (7.268Â mAÂ cmâ2, 3.83 times higher than that of commercial carbon-supported Pt nanoparticles, 1.894Â mAÂ cmâ2), along with a considerably improved tolerance to poisoning (current decline: 69% vs 99.89%). These results indicate a great potential for PtAuNA/G in fabricating high-performance direct methanol fuel cells.
Keywords
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Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Gang Chang, Zhiwei Cai, Hongmei Jia, Zaoli Zhang, Xiong Liu, Zhihua Liu, Ruizhi Zhu, Yunbin He,