کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1481110 | 1510456 | 2013 | 8 صفحه PDF | دانلود رایگان |
In the present paper, we present and discuss data on the thermodynamic properties of electrochemically deposited crystalline and vitreous metallic electrodes, focusing our attention on the model system of vitreous Ni/P alloys. Galvanic cells based on the glass → crystal transition are constructed and their electrochemical properties are analyzed as an alternative approach for the complete thermodynamic description of amorphous electron conductors. The EMF of the glass → crystal Ni/P–Ni battery when both crystalline Ni and the amorphous Ni/P layers electrodes placed in their native solution, gives ΔE(T) values from 0.120 to 0.140 V in the temperature range from 293 to 333 K. For the same system, we report a corrosion potential difference of ΔE = 0.100 V (at 298 K, in a 1 M H2SO4 electrolyte) between the glassy and the crystalline electrodes. The kinetic considerations of the deposition process provide a new way for interpretation of the mechanism of formation of amorphous deposits during electrodeposition and electroless formation of amorphous Ni3P layers based on a kinetic interpretation of Ostwald's Rule of Stages.
► New approach for complete description of the physical properties of metglasses.
► Electrochemistry is used for complete determination of basic kinetic parameters.
► EMF measurements to determine the frozen-in enthalpy and entropy differences.
Journal: Journal of Non-Crystalline Solids - Volume 382, 15 December 2013, Pages 125–132