CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTION

The electro-oxidation of methanol at Pt-Ir and Pt deposits, and at Pt, Ir, and Pt-Ir wires in sulfuric acid solution was studied by cyclic voltammetry (CV), and in the case of Pt-Ir and Pt electrodeposits, also with the electrochemical quartz crystal microbalance (EQCM). The effect of repetitive pot...

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Autores principales:	URETA-ZAÑARTU,M.SOLEDAD, BRAVO,PATRICIA, REYES,GLORIA, YAÑEZ,CLAUDIA, GANCELO,J.RAMON, GUTIERREZ,CLAUDIO, MARCO,JOSE F
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2001
Materias:	methanol electrooxidation bimetallic electrodes EQCM electrocatalysis
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000300013
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spelling	oai:scielo:S0366-164420010003000132002-02-05CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTIONURETA-ZAÑARTU,M.SOLEDADBRAVO,PATRICIAREYES,GLORIAYAÑEZ,CLAUDIAGANCELO,J.RAMONGUTIERREZ,CLAUDIOMARCO,JOSE F methanol electrooxidation bimetallic electrodes EQCM electrocatalysis The electro-oxidation of methanol at Pt-Ir and Pt deposits, and at Pt, Ir, and Pt-Ir wires in sulfuric acid solution was studied by cyclic voltammetry (CV), and in the case of Pt-Ir and Pt electrodeposits, also with the electrochemical quartz crystal microbalance (EQCM). The effect of repetitive potential cycling on the Pt-Ir deposits, in the absence and presence of methanol, was also investigated by EQCM. Ir did not increase the activity of Pt for methanol oxidation, nor there was a significant effect of potential cycling on the activity of Pt-Ir electrodes. EQCM and CV results showed that potential cycling produced a sintering of the Pt-Ir codeposits without loss of Ir to the solution. XPS analyses of cycled Pt-Ir/Ti electrodes showed that in the absence of methanol the Ir/Pt ratio decreased with cycling to one half of its value for the fresh deposit if the upper potential limit was 0.86 V vs. SCE, but increased by 30% if the said limit was increased to 1.1 V, showing the growth of an Ir oxide layer. Quite unexpectedly, cycling up to 1.1 V in the presence of methanol completely eliminated Pt(II) species from the surface, and decreased very much the fraction of Ir(IV) speciesinfo:eu-repo/semantics/openAccessSociedad Chilena de QuímicaBoletín de la Sociedad Chilena de Química v.46 n.3 20012001-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000300013en10.4067/S0366-16442001000300013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	methanol electrooxidation bimetallic electrodes EQCM electrocatalysis
spellingShingle	methanol electrooxidation bimetallic electrodes EQCM electrocatalysis URETA-ZAÑARTU,M.SOLEDAD BRAVO,PATRICIA REYES,GLORIA YAÑEZ,CLAUDIA GANCELO,J.RAMON GUTIERREZ,CLAUDIO MARCO,JOSE F CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTION
description	The electro-oxidation of methanol at Pt-Ir and Pt deposits, and at Pt, Ir, and Pt-Ir wires in sulfuric acid solution was studied by cyclic voltammetry (CV), and in the case of Pt-Ir and Pt electrodeposits, also with the electrochemical quartz crystal microbalance (EQCM). The effect of repetitive potential cycling on the Pt-Ir deposits, in the absence and presence of methanol, was also investigated by EQCM. Ir did not increase the activity of Pt for methanol oxidation, nor there was a significant effect of potential cycling on the activity of Pt-Ir electrodes. EQCM and CV results showed that potential cycling produced a sintering of the Pt-Ir codeposits without loss of Ir to the solution. XPS analyses of cycled Pt-Ir/Ti electrodes showed that in the absence of methanol the Ir/Pt ratio decreased with cycling to one half of its value for the fresh deposit if the upper potential limit was 0.86 V vs. SCE, but increased by 30% if the said limit was increased to 1.1 V, showing the growth of an Ir oxide layer. Quite unexpectedly, cycling up to 1.1 V in the presence of methanol completely eliminated Pt(II) species from the surface, and decreased very much the fraction of Ir(IV) species
author	URETA-ZAÑARTU,M.SOLEDAD BRAVO,PATRICIA REYES,GLORIA YAÑEZ,CLAUDIA GANCELO,J.RAMON GUTIERREZ,CLAUDIO MARCO,JOSE F
author_facet	URETA-ZAÑARTU,M.SOLEDAD BRAVO,PATRICIA REYES,GLORIA YAÑEZ,CLAUDIA GANCELO,J.RAMON GUTIERREZ,CLAUDIO MARCO,JOSE F
author_sort	URETA-ZAÑARTU,M.SOLEDAD
title	CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTION
title_short	CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTION
title_full	CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTION
title_fullStr	CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTION
title_full_unstemmed	CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTION
title_sort	cyclic voltammetric and eqcm study of the behaviour and stability of pt-ir deposits and pt-ir wire electrodes for methanol electrooxidation in acid solution
publisher	Sociedad Chilena de Química
publishDate	2001
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000300013
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CYCLIC VOLTAMMETRIC AND EQCM STUDY OF THE BEHAVIOUR AND STABILITY OF PT-IR DEPOSITS AND PT-IR WIRE ELECTRODES FOR METHANOL ELECTROOXIDATION IN ACID SOLUTION

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