Li, G. , von Spakovsky, M. R., Shen, F. and Lu, K. (2018) Multiscale transient and steady-state study of the influence of microstructure degradation and chromium oxide poisoning on solid oxide fuel cell cathode performance. Journal of Non-Equilibrium Thermodynamics, 43(1), pp. 21-42. (doi: 10.1515/jnet-2017-0013)
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Abstract
Oxygen reduction in a solid oxide fuel cell cathode involves a nonequilibrium process of coupled mass and heat diffusion and electrochemical and chemical reactions. These phenomena occur at multiple temporal and spatial scales, making the modeling, especially in the transient regime, very difficult. Nonetheless, multiscale models are needed to improve the understanding of oxygen reduction and guide cathode design. Of particular importance for long-term operation are microstructure degradation and chromium oxide poisoning both of which degrade cathode performance. Existing methods are phenomenological or empirical in nature and their application limited to the continuum realm with quantum effects not captured. In contrast, steepest-entropy-ascent quantum thermodynamics can be used to model nonequilibrium processes (even those far-from equilibrium) at all scales. The nonequilibrium relaxation is characterized by entropy generation, which can unify coupled phenomena into one framework to model transient and steady behavior. The results reveal the effects on performance of the different timescales of the varied phenomena involved and their coupling. Results are included here for the effects of chromium oxide concentrations on cathode output as is a parametric study of the effects of interconnect-three-phase-boundary length, oxygen mean free path, and adsorption site effectiveness. A qualitative comparison with experimental results is made.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Li, Dr Guanchen |
| Authors: | Li, G., von Spakovsky, M. R., Shen, F., and Lu, K. |
| College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
| Journal Name: | Journal of Non-Equilibrium Thermodynamics |
| Publisher: | De Gruyter |
| ISSN: | 0340-0204 |
| ISSN (Online): | 1437-4358 |
| Published Online: | 14 November 2017 |
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