| dc.creator | URETA-ZAÑARTU,M.SOLEDAD | |
| dc.creator | BRAVO,PATRICIA | |
| dc.creator | REYES,GLORIA | |
| dc.creator | YAÑEZ,CLAUDIA | |
| dc.creator | GANCELO,J.RAMON | |
| dc.creator | GUTIERREZ,CLAUDIO | |
| dc.creator | MARCO,JOSE F | |
| dc.date | 2001-09-01 | |
| dc.date.accessioned | 2019-09-10T12:40:50Z | |
| dc.date.available | 2019-09-10T12:40:50Z | |
| dc.identifier | https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0366-16442001000300013 | |
| dc.identifier.uri | https://revistaschilenas.uchile.cl/handle/2250/106094 | |
| dc.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 | |
| dc.format | text/html | |
| dc.language | en | |
| dc.publisher | Sociedad Chilena de Química | |
| dc.relation | 10.4067/S0366-16442001000300013 | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.source | Boletín de la Sociedad Chilena de Química v.46 n.3 2001 | |
| dc.subject | methanol electrooxidation | |
| dc.subject | bimetallic electrodes | |
| dc.subject | EQCM | |
| dc.subject | electrocatalysis | |
| dc.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 | |
