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Determination of the zincate diffusion coefficient and its application to alkaline battery problemsThe diffusion coefficient for the zincate ion at 24 C was found to be 9.9 x 10 to the -7th power sq cm/sec + or - 30% in 45% potassium hydroxide and 1.4 x 10 to the -7th power sq cm/sec + or - 25% in 40% sodium hydroxide. Comparison of these values with literature values at different potassium hydroxide concentrations show that the Stokes-Einstein equation is obeyed. The diffusion coefficient is characteristic of the zincate ion (not the cation) and independent of its concentration. Calculations with the measured value of the diffusion coefficient show that the zinc concentration in an alkaline zincate half-cell becomes uniform throughout in tens of hours by diffusion alone. Diffusion equations are derived which are applicable to finite-size chambers. Details and discussion of the experimental method are also given.
Document ID
19790027534
Document Type
Conference Paper
Authors
May, C. E. (NASA Lewis Research Center Cleveland, OH, United States)
Kautz, H. E. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
October 1, 1978
Subject Category
INORGANIC AND PHYSICAL CHEMISTRY
Meeting Information
Electrochemical Society, Meeting(Pittsburgh, PA)
Distribution Limits
Public
Copyright
Other