Carbon supported Pt-NiO nanoparticles for ethanol electro-oxidation in acid media

JOURNAL OF POWER SOURCES

卷:278

Article

Comignani, Vanina¹  Manuel Sieben, Juan¹  Brigante, Maximilian E.²  Duarte, Marta M. E.¹ 

[1] Univ Nacl Sur, CONICET, Inst Ingn Electroquim & Corros, RA-8000 Bahia Blanca, Buenos Aires, Argentina

[2] Univ Nacl Sur, CONICET, Dept Quim, INQUISUR, RA-8000 Bahia Blanca, Buenos Aires, Argentina

关键词: Pt-NiO/C nanostructured catalysts;    Ethanol oxidation;    Temperature dependence;    Apparent activation energy;   

DOI  :  10.1016/j.jpowsour.2014.12.063

来源: Elsevier

【 摘 要 】

In the present work, the influence of nickel oxide as a co-catalyst of Pt nanoparticles for the electro-oxidation of ethanol in the temperature range of 23-60 degrees C was investigated. The carbon supported nickel oxide and platinum nanoparticles were prepared by hydrothermal synthesis and microwave-assisted polyol process respectively, and characterized by XRD, EDX, TEM and ICP analysis. The electrocatalytic activity of the as-prepared materials was studied by cyclic voltammetry and chronoamperometry. Small metal nanoparticles with sizes in the range of 3.5-4.5 nm were obtained. The nickel content in the as-prepared Pt NiO/C catalysts was between 19 and 35 at.%. The electrochemical experiments showed that the electrocatalytic activity of the Pt NiO/C materials increase with NiO content in the entire temperature range. The apparent activation energy (E-a,E-app) for the overall ethanol oxidation reaction was found to decrease with NiO content (24-32 kJ mol(-1) at 0.3 V), while for Pt/C the activation energy exceeds 48 kJ mol(-1). The better performance of the Pt NiO/C catalysts compared to Pt/C sample is ascribed to the activation of both the C-H and O-H bonds via oxygen-containing species adsorbed on NiO molecules and the modification of the surface electronic structure (changes in the density of states near the Fermi level). (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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