Abstract
The thermoneutral potential (EH) for any electrochemical reaction corresponds to the enthalpy change (∆H) for that reaction. The D2O electrolysis reaction produces an enthalpy change of ∆H = 294.600 J/mol of D2O which yields a thermoneutral potential ofEH = −1.5267 V (−∆H/2F ). This thermoneutral potential will apply throughout a Pd/D2O calorimetric experiment except for the first day or two where the loading of deuterium into the palladium cathode occurs. The changes in ∆H and EH during loading and their ffect on measurements of excess power will be presented. It is concluded that the changes in EH during deuterium loading do not explain the very early excess power measurements for Pd–B cathodes. Furthermore, boron may be a critical component for the excess power effect in the palladium – D2O system.
Published Version
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