Reactions involving H, OH and O species on rhodium in H<sub>2</sub>SO<sub>4</sub>·12H<sub>2</sub>O and HClO<sub>4</sub>·5.5H<sub>2</sub>O in the range 198–298 K

The voltammetric behaviour of polycrystalline rhodium in H<sub>2</sub>SO<sub>4</sub>·12H<sub>2</sub>O and HClO<sub>4</sub>·5.5H<sub>2</sub>O was investigated by conventional and triangularly modulated voltammetry in the range 198–298 K. H a...

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Detalles Bibliográficos
Autores principales:	Florit, María Inés, Bolzán, Agustín Eduardo, Arvia, Alejandro Jorge
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	1995
Materias:	Ciencias Exactas Química Hydrogen Hydroxide Oxygen Rhodium Voltammetry Electrosorption Sulplate Perchlorate
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/125841 https://www.sciencedirect.com/science/article/abs/pii/002207289503983N
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

Descripción
Sumario:	The voltammetric behaviour of polycrystalline rhodium in H<sub>2</sub>SO<sub>4</sub>·12H<sub>2</sub>O and HClO<sub>4</sub>·5.5H<sub>2</sub>O was investigated by conventional and triangularly modulated voltammetry in the range 198–298 K. H and OH electrosorption reactions and a fast electrochemical process in the potential range preceding the oxygen evolution reaction (OER) were studied. For both electrolytes, as the temperature diminished, the H atom reactions and those reactions related to the O-containing surface species became increasingly irreversible, whereas the fast electrochemical process preceding the OER was nearly the same, irrespective of the temperature. Explanations recently advanced for the behaviour of Rh in more diluted solutions of the same acids at 298 K and the electrochemical behaviour of the different processes are discussed, considering mainly the effects of sulphate anion adsorption and perchlorate anion decomposition on Rh.