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Study of the (electro)chemical equilibria in molten carbonate under MCFC cathode gas conditions. Part II: non-equilibrium study of (electro)chemical reactions involved in oxygen reduction in molten carbonate by W.H.A. Peelen; M. van Driel; K. Hemmes; J.H.W. de Wit is a Engineering article available to read on EtoBox.

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AbstractÐAssuming fast CO 2 dissolution into the melt, the recombination reaction rate of O 2À with CO 2 was determined at 8.1 2 0.1 Â 10 À2 atm À1 s À1 with oxide addition experiments. This is a few times higher than the value of 1.7 Â 10 À2 atm À1 s À1 determined by Lu and Selman using the same experimental method [1]. Both values are six orders of magnitude smaller than the value of 7.6 Â 10 4 atm À1 s À1 obtained by Nishina et al. from CV measurements [2]. A slow CO 2 dissolution rate, though unlikely, was discussed as possible explanation for this discrepancy. For the fast and slow recombination reaction rates an acidic and basic melt was calculated respectively in the cathode in an operating MCFC. It was found here that the predominant reduced oxygen species in molten Li/K carbonates changes from peroxide in basic melts to probably superoxide in acidic melts, which is in accordance with most of the recent literature [2±10]. In the former case eects from autocatalytic reactions on the performance of the MCFC cathode as suggested by Adanuvor et al. are likely [11]. Non-equilibrium experiments showed that the cyclic voltammetry (CV) response of the reversible reduction of O 2 2À

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Author

W.H.A. Peelen; M. van Driel; K. Hemmes; J.H.W. de Wit

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

1998

Language

EN

Field

Engineering (Physical Sciences)