Accession Number : AD0462038


Title :   Electrochemistry of fuel cell electrodes. Interfacial tension of indium amalgams in 0.1 MHC104 at 25 C.


Descriptive Note : Technical memo.,


Corporate Author : TYCO LABS INC WALTHAM MA


Personal Author(s) : Butler, James N


Report Date : Apr 1965


Pagination or Media Count : 1


Abstract : A method is described for determining interfacial tension by firing a theoretical curve to the experimentally-measured shape of a sessile differential equation describing the drop shape. Absolute measurements of interfacial tension for amalgams containing up to 64 mole % indium were made in 0.1 M HClO4 at 25 C. These were combined with previously measured values of zero-charge potential and differential capacity, to generate a familiy of electrocapillary curves from which the surface excess was calculated using the Gibbs equation. The surface excess is negative, and passes through a maximum negative value at approximately 20 mole % indium. The parameters of the hydrogen evolution reaction on indium amalgams correlate with the bulk electronic properties of the amalgams, but not with the surface composition. (Author)


Descriptors :   *ELECTRODES , ELECTROCHEMISTRY , FUEL CELLS , MERCURY ALLOYS , SURFACE TENSION , PERCHLORIC ACID , MEASUREMENT , VOLTAGE , MATHEMATICAL ANALYSIS


Distribution Statement : APPROVED FOR PUBLIC RELEASE