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  • 1
    Digitale Medien
    Digitale Medien
    Solid state electrochemical reactions in systems with miscibility gaps (2000)
    Springer
    Journal of solid state electrochemistry 4 (2000), S. 394-401 
    Details
    ISSN: 1433-0768
    Schlagwort(e): Key words Miscibility gap ; Mixed phases ; Cyclic voltammetry ; Solid state electrochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Cyclic voltammograms of electroactive solid compounds with partial immiscibility between the oxidized and reduced phases can exhibit a splitting of the peaks. If the free energy of transformation between the oxidized and reduced phases is small, the formal potentials of the redox pair will be almost the same in both solid phases. This results in an inert potential range in which no appreciable electrochemical activity is possible. The kinetic implications of this situation have been analysed in relation to the width of the miscibility gap. The diffusion of ions in the particle, which is hindered by the immiscibility, can proceed when a transition zone between the two phases exists in which the crystal structure is changed. If there is no such transition zone the voltammogram will display several spikes, which are caused by the collapse of concentration barriers at the sharp interfaces between the two phases in the mixed crystals.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100089900093
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  • 2
    Digitale Medien
    Digitale Medien
    The effect of the electrolyte concentration in the solution on the voltammetric response of insertion electrodes (1998)
    Springer
    Journal of solid state electrochemistry 2 (1998), S. 401-404 
    Details
    ISSN: 1433-0768
    Schlagwort(e): Key words Insertion electrode ; Cyclic voltammetry ; Electrolyte concentration ; Mass transport ; Solid-state electrochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A solid-state redox reaction involving an insertion of ions is analyzed with respect to the influence of the concentration of inserting ions in the solution phase. The voltammetric response is independent of the mass transfer in the solution provided that z = (D ss/D aq)1/2 ρ/[C+]* is smaller than 0.1 (D ss: diffusion coefficient of the cation C+ in the crystal; D aq: diffusion coefficient of the cation C+ in the solution; ρ: density of the solid compound; [C+]*: concentration of cations in the bulk of the solution). In real cases this condition will be satisfied at solution concentrations above 1 mol/l.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100080050117
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  • 3
    Digitale Medien
    Digitale Medien
    Staircase voltammetry with finite diffusion space (1997)
    Weinheim : Wiley-Blackwell
    Electroanalysis 9 (1997), S. 575-577 
    Details
    ISSN: 1040-0397
    Schlagwort(e): Staircase voltammetry ; Thin-layer cell ; Finite diffusion space ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A theory of the staircase voltammetry in a thin-layer cell is developed. The influence of the cell thickness and the redox reaction rate constant on the current and the peak potentials is analyzed. For moderately thick cells, the kinetic maximum is predicted. The relationship between peak currents and the square root of the scan rate is not linear and the response may entirely vanish if the redox reaction is fast, the cell is very thin and the scan rate is slow.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/elan.1140090715
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