Resumo

GONCALVES, Anne-Marie et al. New Potential Candidates for Redox Battery Using Liquid Ammoniates: Na⁺/Na and Ag⁺/Ag. Port. Electrochim. Acta [online]. 2006, vol.24, n.1, pp.117-127. ISSN 0872-1904.

Liquid ammoniates, which are highly conductive electrolyte (more than 100 mS.cm^-1 at 20 °C), are proposed as solvents for a redox battery working around room temperature, and up 80 °C. In the negative compartment, the anolyte is NaI · 3.3NH₃, and the Na⁺/Na couple is proposed. It is reversible, as determined by cyclic voltammetry and galvanostatic cycling. In the positive compartment, the catholyte NaI · 3.3NH₃ enriched in silver cations is proposed too. The cathodic material is merely this compound and the cathode is the silver metal. The couple Ag⁺/Ag is reversible too, as determined by cyclic voltammetry and galvanostatic cycling. Metallic sodium is extremely stable in this electrolyte; therefore NaI · 3.3NH₃ could be used in a redox battery of high energy density and high power density. The maximum working temperature, which is proposed, 70 °C, is lower than the melting point of sodium (98 °C), and avoids high pressures of ammonia.

Palavras-chave : rhodium microparticles; electrocatalysis; carbon monoxide; formic acid; FTIR study.

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