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堿性條件下M/C(M=Pt, Pd, Ni, Ag, Au)對(duì)甲醇氧化電催化活性的對(duì)比研究
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國(guó)家自然科學(xué)基金（20676088）；國(guó)家高技術(shù)研究發(fā)展計(jì)劃（“863”計(jì)劃）（2006AA05Z139）


Contrast Investigation for Performance of Methanol Electro-catalytic Oxidation of M/C (M=Pt, Pd, Ni, Ag, Au) in Alkaline Media
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    摘要:

    用化學(xué)還原法制備了M/C(M=Pt, Pd, Ni, Ag, Au) 5種納米金屬碳截催化劑，用XRD、XPS分別表征活性物的晶相結(jié)構(gòu)、表面組成和價(jià)態(tài)形式，用TEM觀察催化劑微觀形貌，用循環(huán)伏安法測(cè)定不同催化劑對(duì)甲醇氧化的電催化活性。結(jié)果表明，催化劑中的納米金屬粒徑在3~11 nm之間，純度較高，在載體表面的分布較為均勻；Pd/C催化劑對(duì)甲醇氧化有較好的催化作用，Ni/C對(duì)甲醇氧化有一定的活性，而Ag/C和Au/C幾乎沒(méi)有活性。在1 mol·L-1CH3OH+1 mol·L-1NaOH條件下，Pd/C對(duì)甲醇氧化最高峰電流密度為890 mA·mg-1，約為Pt/C的66%，Ni/C對(duì)甲醇氧化最高峰電流密度為6.3 mA·mg-1，僅為Pt/C的0.46%。

    Abstract:

    Five kinds of nano-metal carbon-supported catalysts M/C (M=Pt, Pd, Ni, Ag, Au) were prepared by a chemical reduction method. The crystal structure, surface composition and element valence state were characterized by X-ray diffraction and X-ray photoelectron spectroscopy, respectively, the morphology of the catalysts was observed by TEM, and the electro-catalytic activity to methanol oxidation was measured by cyclic voltammetry. The results show that the nano-particles with high purity are well dispersed on active black carbon and their sizes are from 3 nm to 11 nm; Pd/C catalyst exhibits high activity to methanol electro-oxidation; Ni/C possesses certain activity to methanol oxidation, but Ag/C and Au/C almost do not have activity. In 1.0 mol·L-1CH3OH+1.0 mol·L-1NaOH, the peak current density of Pd/C to methanol oxidation is 890 mA·mg-1, about 66% of that of Pt/C, and the peak current density of Ni/C is 6.3 mA·mg-1, only 0.46% of that of Pt/C.

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劉世斌,韓 兵,張忠林,段東紅,郝曉剛.堿性條件下M/C(M=Pt, Pd, Ni, Ag, Au)對(duì)甲醇氧化電催化活性的對(duì)比研究[J].稀有金屬材料與工程,2011,40(8):1483~1487.[Liu Shibin, Han Bing, Zhang Zhonglin, Duan Donghong, Hao Xiaogang. Contrast Investigation for Performance of Methanol Electro-catalytic Oxidation of M/C (M=Pt, Pd, Ni, Ag, Au) in Alkaline Media[J]. Rare Metal Materials and Engineering,2011,40(8):1483~1487.]
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  • 收稿日期:2010-08-28
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