The determination of thermal junction potential difference

A novel method has been designed and exploited to determine the thermal junction potential difference (TJPD) between two acids or alkalies of the same composition but with different temperature. The absolute value of measured TJPD between two strong acids (or alkalies) maintained at different temper...

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Bibliographic Details
Published inScience China. Chemistry Vol. 61; no. 8; pp. 1020 - 1024
Main Authors Uwitonze, Nestor, Chen, Wei, Zhou, Da, He, Zhengda, Chen, Yan-Xia
Format Journal Article
LanguageEnglish
Published Beijing Science China Press 01.08.2018
Springer Nature B.V
Subjects
Acids
Alkalies
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Diffusion rate
Electrocatalysis
Electrodes
Electrolytes
Equilibrium
High temperature
Kinetics
Poisoning
Poisons
Reaction kinetics
Temperature effects
Temperature gradients
activation energy
thermal junction potential difference
electrode kinetics
electrocatalysis
temperature effect
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Summary:A novel method has been designed and exploited to determine the thermal junction potential difference (TJPD) between two acids or alkalies of the same composition but with different temperature. The absolute value of measured TJPD between two strong acids (or alkalies) maintained at different temperatures increases with increasing of the temperature difference between the two electrolytes over the range from 0 to 40 °C. In strong acids, the hot end always has the lower potential while in strong alkalies, the cold end has the lower potential. This is because the ions of fast diffusion rate contribute most to the TJPD. Our results demonstrate the importance of the correction for TJPD in deriving the kinetic parameters when studying the temperature effect on reaction kinetics.
ISSN:1674-7291
1869-1870
DOI:10.1007/s11426-017-9246-8