Souza, Adriana Rodrigues deArashiro, EveraldoGolveia, HelderLassali, Tânia Aparecida Farias2012-11-292012-11-292004SOUZA, A. R. de et al. Pseudocapacitive behavior of Ti/RhOx+Co3O4 electrodes in acidic medium : application to supercapacitor development. Electrochimica Acta, v. 49, n. 12, p. 2015-2023, maio 2004. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0013468603010508>. Acesso em: 29 nov. 2012.00134686http://www.repositorio.ufop.br/handle/123456789/1886Mixtures of RhOx+Co3O4 have been electrochemically studied by cyclic voltammetry in acid solution as a function of composition. The electrodes were prepared by thermal decomposition at 400 °C of mixtures of nitrate precursors. Their electrochemical behavior shows substantial dependence on the electrode’s composition. The Co site controls the electrochemical behavior of the system in the 5–10 mol.% Rh composition range. A significant increase in the electrodes’ active area is observed for compositions corresponding to more than 10 mol.% RhOx in admixture with Co3O4. Above 10 mol.% Rh, the voltammetric curves become more similar to that for RhOx and then RhOx becomes able to stabilize the Co3O4 in the mixture. Electrodes of this kind have been found to perform as good materials in electrochemical capacitor applications, exhibiting specific capacitances of 500–800 F g−1 over to 20–60 mol.% RhOx composition range. The large specific capacitance exhibited by this system arises from a combination of the double-layer capacitance and the pseudocapacitance associated with Rh surface redox-type reactions.en-USCobalt oxidePseudocapacitanceRhodium oxideSupercapacitorsArtigo publicado em periodicoO periódico Electrochimica Acta concede permissão para depósito do artigo no Repositório Institucional da UFOP. Número da licença: 3345930604271.