Electrochemical synthesis of mesoporous Pt-Au binary alloys with tunable compositions for enhancement of electrochemical performance

Journal of the American Chemical Society
Yusuke YamauchiKazuyuki Kuroda

Abstract

Mesoporous Pt-Au binary alloys were electrochemically synthesized from lyotropic liquid crystals (LLCs) containing corresponding metal species. Two-dimensional exagonally ordered LLC templates were prepared on conductive substrates from diluted surfactant solutions including water, a nonionic surfactant, ethanol, and metal species by drop-coating. Electrochemical synthesis using such LLC templates enabled the preparation of ordered mesoporous Pt-Au binary alloys without phase segregation. The framework composition in the mesoporous Pt-Au alloy was controlled simply by changing the compositional ratios in the precursor solution. Mesoporous Pt-Au alloys with low Au content exhibited well-ordered 2D hexagonal mesostructures, reflecting those of the original templates. With increasing Au content, however, the mesostructural order gradually decreased, thereby reducing the electrochemically active surface area. Wide-angle X-ray diffraction profiles, X-ray photoelectron spectra, and elemental mapping showed that both Pt and Au were atomically distributed in the frameworks. The electrochemical stability of mesoporous Pt-Au alloys toward methanol oxidation was highly improved relative to that of nonporous Pt and mesoporous Pt films, sug...Continue Reading

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Citations

Jul 10, 2012·The Analyst·Sangyun ParkTaek Dong Chung
Jan 31, 2013·Physical Chemistry Chemical Physics : PCCP·Cuiling Li, Yusuke Yamauchi
Aug 27, 2015·Journal of the American Chemical Society·Cuiling LiYusuke Yamauchi
Aug 6, 2016·ACS Applied Materials & Interfaces·Shaofang FuYuehe Lin
May 18, 2016·Scientific Reports·Shuanglong LuHongwei Gu
May 20, 2017·Nature Communications·Bo JiangYusuke Yamauchi
Nov 21, 2015·Chemistry : a European Journal·Masaki KitaharaKazuyuki Kuroda
Aug 2, 2014·Chemistry, an Asian Journal·Xiaojun YiChuan-Jian Zhong
Aug 29, 2018·Chemical Communications : Chem Comm·Daisuke BabaToru Asahi
Oct 1, 2019·Advanced Materials·Zhen HeShu-Hong Yu
Jan 22, 2013·Chemical Society Reviews·Alain Walcarius
Jan 29, 2014·Faraday Discussions·Je Hyun BaeTaek Dong Chung

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