Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/46346
Título: Determination of the Real Surface Area of Pt Electrodes by Hydrogen Adsorption Using Cyclic Voltammetry
Autores/as: Doña Rodríguez, José M. 
Melián, José Alberto Herrera 
Peña, Jésus Pérez 
Clasificación UNESCO: 221001 Catálisis
2303 Química inorgánica
Fecha de publicación: 2000
Editor/a: 0021-9584
Publicación seriada: Journal of Chemical Education 
Resumen: t is well known that the electrical current of an electrochemical process is proportional to the real surface area of the electrode. The presence of surface rugosities due to steps, holes, kinks, and terraces can result in an electrode real surface area that is larger than the geometric one. The electrode real surface area can be evaluated by determining the amount of gas that adsorbs onto the electrode surface. This calculation is possible because every adsorbed gas molecule is attached to one metal atom on the electrode surface, forming a gas monolayer. From crystallographic data the surface atom density can be obtained in consideration of a theoretically flat metal surface. These data allow us to determine the real electrode surface area.In this paper we propose a simple experiment to determine the real surface area of a Pt electrode by voltammetry. The hydrogen adsorption on this metal is achieved by applying sufficiently negative potentials to a Pt electrode in contact with an aqueous solution. Each adsorbed hydrogen atom requires the transfer of one electron. Hydrogen gas evolution starts only when the monolayer is completed. Then the cathodic current rapidly rises. The hydrogen monolayer formation charge transference can be calculated by integrating the voltammetric curves. The integration limits are the potentials at which the hydrogen adsorption and evolution start.
URI: http://hdl.handle.net/10553/46346
ISSN: 0021-9584
Fuente: Journal of Chemical Education [ISSN 0021-9584], v. 77, p. 1195-1197
Colección:Artículos
Vista completa

Google ScholarTM

Verifica


Comparte



Exporta metadatos



Los elementos en ULPGC accedaCRIS están protegidos por derechos de autor con todos los derechos reservados, a menos que se indique lo contrario.