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Preparation and characterization of PdxAgy/C electrocatalysts for ethanol electrooxidation reaction in alkaline media
Li, Guanglan1,2; Jiang, Luhua1; Jiang, Qian1,2; Wang, Suli1; Sun, Gongquan1
关键词Electrocatalyst Ethanol Electrooxidation Pdag Alloy Degree Particle Size Alkaline Media
刊名ELECTROCHIMICA ACTA
2011-09-01
DOI10.1016/j.electacta.2011.06.036
56期:22页:7703-7711
收录类别SCI
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Electrochemistry
研究领域[WOS]Electrochemistry
关键词[WOS]SUPPORTED PLATINUM CATALYSTS ; ALCOHOL FUEL-CELLS ; ALLOY ELECTROCATALYSTS ; OXYGEN REDUCTION ; PD/C CATALYSTS ; SIZE ANALYSIS ; OXIDATION ; PALLADIUM ; METHANOL ; OXIDE
英文摘要Carbon-supported bimetallic PdAg catalysts with Pd/Ag atomic ratios varying from 4/1 to 1/2 were prepared by an impregnation-reduction method. The impregnated black mixture was treated in H-2/N-2 atmosphere at a temperature varying from 180 to 500 degrees C. The obtained PdxAgy/C catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), cyclic voltammetry (CV) and chronoamperometry (CA). XRD results show that the lattice constant of Pd is dilated, suggesting the formation of PdAg alloy. The lattice constant of Pd for the PdxAgy/C-500 (reduced at 500 degrees C by H-2) increases linearly and the average metal particle size decreases slightly from 6.8 to 5.1 nm with increasing Ag fractions from 20% to 67% in the PdAg composition. For PdxAgy/C catalysts with a certain specific Pd/Ag atomic ratio, e.g., Pd2Ag1/C, the dilated lattice constant of Pd is independent of the reducing temperature, indicating the alloy degree for the Pd2Ag1/C-t catalysts is comparable. The average metal particle size for the Pd2Ag1/C-t catalysts increases from 3.4 to 5.2 nm with H-2 reduction temperature increasing from 180 to 500 degrees C. The potentiodynamic measurements on ethanol electrooxidation reaction (EOR) show that the catalytic activities for the PdxAgy/C-t catalysts toward the EOR are improved by alloying Pd with Ag. At typical potential of a working fuel cell, e.g., -0.4V vs. Hg/HgO, the EOR current density presents a volcano shape as a function of the Ag fractions in PdAg with the maximum occurs at the Pd/Ag atomic ratios between 2/1 and 3/1. The CA tests show that the PdxAgy/C-500 catalysts perform high stability than that of Pd/C-500. The improved EOR activity for the PdxAgy/C-t catalysts, compared with whether Pd/C or Ag/C catalyst, may possibly be attributed to the formation of PdAg alloy and the fitted particle size. (C) 2011 Elsevier Ltd. All rights reserved.
语种英语
WOS记录号WOS:000295303700039
引用统计
被引频次:63[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/142700
专题中国科学院大连化学物理研究所
作者单位1.Chinese Acad Sci, Dalian Inst Chem Phys, Direct Alcohol Fuel Cell Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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Li, Guanglan,Jiang, Luhua,Jiang, Qian,et al. Preparation and characterization of PdxAgy/C electrocatalysts for ethanol electrooxidation reaction in alkaline media[J]. ELECTROCHIMICA ACTA,2011,56(22):7703-7711.
APA Li, Guanglan,Jiang, Luhua,Jiang, Qian,Wang, Suli,&Sun, Gongquan.(2011).Preparation and characterization of PdxAgy/C electrocatalysts for ethanol electrooxidation reaction in alkaline media.ELECTROCHIMICA ACTA,56(22),7703-7711.
MLA Li, Guanglan,et al."Preparation and characterization of PdxAgy/C electrocatalysts for ethanol electrooxidation reaction in alkaline media".ELECTROCHIMICA ACTA 56.22(2011):7703-7711.
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