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Electrochemical redox potential in flame plasma

Caruana, DJ; McCormack, SP; (2002) Electrochemical redox potential in flame plasma. ELECTROCHEM COMMUN , 4 (10) 780 - 786.

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Abstract

Electrochemical redox potentials for species in a gaseous electrolyte have been measured. A two compartment flame plasma electrochemical cell used here was similar to that described in a previous publication [Electrochem. Commun. 3 (2001) 675]. In this work, different ionisable metallic species were introduced into both compartments of the electrochemical cell. The potentials measured for the cells Pt\K,K+\\Cu+,Cu\Pt, Pt\K,K+\\Mg+,Mg\Pt and Pt\K,K+\\K+,K\Pt were -0.305, +0.210 and 0 V, respectively, when the concentrations of ions in both compartments was equal (in the absence of diffusion/junction potential). The potential was dependent only on the identity of the metal species added to the flame electrochemical cell and was related to the activities of the ions present. We propose the half-cell reactions for each cell compartment was the ionisation reaction, A --> A(+) + e(-). We discuss the interpretation of the electrochemical cell in relation to the oxidised/reduced species present in the flame electrolyte. These results presented in this publication are the first electrochemical redox measurements for ions in the gas phase. (C) 2002 Elsevier Science B.V. All rights reserved.

Type:Article
Title:Electrochemical redox potential in flame plasma
Keywords:electrochemistry, gas phase, redox potentials, flame plasma, GAS-PHASE, IONS, MOLECULES, ATOMS, METAL
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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