Significant Role of Ru-Oxide Present in the Pt-Ru Alloy Catalyst for Ethanol Electro-Oxidation in Acid Medium

被引：21

作者：

Datta, J. ^{[1
]}

Sen Gupta, S. ^{[1
]}

Singh, S. ^{[1
]}

Mukherjee, S. ^{[2
]}

Mukherjee, M. ^{[2
]}

机构：

[1] Bengal Engn & Sci Univ, Dept Chem, Sibpur 711103, Howrah, India

[2] Saha Inst Nucl Phys, Surface Phys Div, Kolkata, India

来源：

MATERIALS AND MANUFACTURING PROCESSES | 2011年 / 26卷 / 02期

关键词：

Activation energy; Bifunctional mechanism; Electrodeposition; Electron microscope; Electro-oxidation; Impedence spectroscopy; XPS; X-ray; ANODE CATALYSTS; FUEL-CELLS; METHANOL ELECTROOXIDATION; CO TOLERANCE; AD-ATOMS; OXIDATION; ELECTROCATALYSIS; ENHANCEMENT; PLATINUM; SN;

D O I：

10.1080/10426914.2010.520796

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This work relates to the search for optimum Pt-Ru catalyst composition for electro-oxidation of ethanol. The structure, morphology, and composition of the synthesized Pt-Ru catalysts were investigated through techniques like X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), and X-ray photoelectron spectroscopy (XPS) while cyclic-voltammetry, polarization, chronoamperometry, impedance spectroscopy were employed to study the electrocatalytic behavior of the catalyst. XPS spectrum of the binary sample suggests that the facile oxygen transfer from Ru to Pt site occurs, depending upon the respective valency state and the relative amount of oxide species present in the catalyst. The temperature dependence of ethanol oxidation afforded the determination of the activation energies of catalysts. The apparent reaction order with respect to ethanol was determined with the help of linear sweep voltammetry. The pronounced catalytic activity was observed for at around 12 at% Ru containing electrodes.

引用

页码：261 / 271

页数：11

共 25 条

[1] Analysis of the electrochemical characteristics of a direct methanol fuel cell based on a Pt-Ru/C anode catalyst [J].

Arico, AS ;

Creti, P ;

Kim, H ;

Mantegna, R ;

Giordano, N ;

Antonucci, V .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (12) :3950-3959

[2]

Barsoukov E, 2005, IMPEDANCE SPECTROSCOPY: THEORY, EXPERIMENT, AND APPLICATIONS, 2ND EDITION, pXII

[3] Pt submonolayers on Ru nanoparticles - A novel low Pt loading, high CO tolerance fuel cell electrocatalyst [J].

Brankovic, SR ;

Wang, JX ;

Adzic, RR .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2001, 4 (12) :A217-A220

[4] The influence of PtRu atomic composition on the yields of ethanol oxidation: A study by in situ FTIR spectroscopy [J].

Camara, GA ;

de Lima, RB ;

Iwasita, T .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 2005, 585 (01) :128-131

[5] Catalysis of ethanol electro oxidation by PtRu: the influence of catalyst composition [J].

Camara, GA ;

de Lima, RB ;

Iwasita, T .

ELECTROCHEMISTRY COMMUNICATIONS, 2004, 6 (08) :812-815

[6] Methanol electro-oxidation on unsupported Pt-Ru alloys at different temperatures [J].

Chu, D ;

Gilman, S .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1996, 143 (05) :1685-1690

[7]

Crist B.V., 2000, Handbook of monochromatic XPS spectra, V1

[8]

*ECH CHEM BV, 2000, AUT US MAN FREQ RESP

[9] TEMPERATURE-DEPENDENT METHANOL ELECTROOXIDATION ON WELL-CHARACTERIZED PT-RU ALLOYS [J].

GASTEIGER, HA ;

MARKOVIC, N ;

ROSS, PN ;

CAIRNS, EJ .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1994, 141 (07) :1795-1803

[10]

GRENWOOD NN, 2005, CHEM ELEMENTS

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