A comparison of calorimetric methods applied to the electrolysis of heavy water on palladium cathodes

The thermal power output of a galvanostatic D 2O electrolysis cell was determined simultaneously by two methods. The first, water-flow calorimetry, gave results rigorously independent of the nature of the heat source. The second, an isoperibolic method involving measurement of temperatures within th...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry and interfacial electrochemistry 1990-11, Vol.295 (1), p.393-402
Main Authors: Wagner, Frederick T., Moylan, Thomas E., Hayden, Michael E., Narger, Ulrike, Booth, James L.
Format: Article
Language:English
Subjects:
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Photoelectrochemistry. Electrochemiluminescence
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Summary:The thermal power output of a galvanostatic D 2O electrolysis cell was determined simultaneously by two methods. The first, water-flow calorimetry, gave results rigorously independent of the nature of the heat source. The second, an isoperibolic method involving measurement of temperatures within the electrolysis cells, gave results in agreement with the first when all factors were accounted for. However, neglect of a drop in effective cell impedance accompanying operation of an in-cell calibration heater, or neglect of effects of the dropping electrolyte level, can produce spurious indications of excess heat. This work demonstrates the need for extreme care in application of isoperibolic methods to electrolytic cells.
ISSN:0022-0728
DOI:10.1016/0022-0728(90)85030-9