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  • 1
    Electronic Resource
    Electronic Resource
    Microscopic in situ diffuse reflectance spectroelectrochemistry of solid state electrochemical reactions of particles immobilized on electrodes (1997)
    Springer
    Journal of solid state electrochemistry 1 (1997), S. 62-67 
    Details
    ISSN: 1433-0768
    Keywords: Key wordsSpectroelectrochemistry ; Diffuse reflectance spectrometry ; Solid state electrochemistry ; Voltammetry ; Microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An instrumental setup is described which allows electrochemical measurements to be performed with solid particles immobilized on the surface of a graphite electrode with in situ recording of diffuse reflectance spectra under an incident light microscope. The instrument used includes a special electrochemical cell and a microscope which is interfaced by a light␣guide to a transputer-integrated photodiode-array spectrometer allowing measurements ranging from 320 to 950 nm with a resolution of 3.2 nm/pixel and a PC-interfaced potentiostat. The 0R0 geometry of the optical arrangement and the use of crossed polarization filters for blocking specular reflectance makes it possible to use the Kubelka-Munk function for quantifying the optical measurements. The above instrument has been used for the study of the electrochromic system of solid silver octacyanomolybdate(IV/V) adjacent to a silver nitrate solution. The in situ diffuse reflec tance spectroelectrochemical measurements prove that the electrochemical reaction starts at the graphite/sample interface and then advances into the bulk of the sample towards the sample/electrolyte interface. The ratios Red:Ox determined by spectrometry and chronocoulometry as a function of electrode potentials are identical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100080050023
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  • 2
    Electronic Resource
    Electronic Resource
    A model for the propagation of a redox reaction through microcrystals (1997)
    Springer
    Journal of solid state electrochemistry 1 (1997), S. 108-113 
    Details
    ISSN: 1433-0768
    Keywords: Key words Chronoamperometry ; Simulation ; Solid state electrochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Chronoamperometry of reversible redox reactions with the insertion of cations into solid particles immobilised at an electrode surface is analysed theoretically using a semiinfinite planar diffusion model. A coupled diffusion of electrons and ions within the crystal lattice is separated in two differential equations. The redox reaction is initiated by the polarisation of the three-phase boundary, where the crystal is in contact with both the electrode and the solution. From this contact line the redox reaction advances on the surface and into the crystal body by the diffusion of ions and conductance of electrons. The effects of the geometry and conductivity of the particles on the current are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100080050030
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    Paper (German National Licenses)
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