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 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.
Keywordsthermal junction potential difference temperature effect electrocatalysis electrode kinetics activation energy
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This work was supported by the National Basic Research Program of China (2015CB932301) and National Natural Science Foundation of China (21273215, 91545124).