Thermodynamic analysis of ammonia fed solid oxide fuel cells : Comparison between proton-conducting electrolyte and oxygen ion-conducting electrolyte

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)682-686
Journal / PublicationJournal of Power Sources
Volume183
Issue number2
Publication statusPublished - 1 Sep 2008
Externally publishedYes

Abstract

A thermodynamic analysis has been performed to compare the theoretical performance of ammonia fed solid oxide fuel cells (SOFCs) based on proton-conducting electrolyte (SOFC-H) and oxygen ion-conducting electrolyte (SOFC-O). It is found that the ammonia fed SOFC-H is superior to SOFC-O in terms of theoretical maximum efficiency. For example, at a fuel utilization of 80% and an oxygen utilization of 20%, the efficiency of ammonia fed SOFC-H is 11% higher than that of SOFC-O. The difference between SOFC-H and SOFC-O becomes more significant at higher fuel utilizations and higher temperatures. This is because an SOFC-H has a higher hydrogen partial pressure and a lower steam partial pressure than an SOFC-O. In addition, an increase in oxygen utilization is found to increase the efficiency of ammonia fed SOFCs due to an increase in oxygen molar fraction and a reduction in steam molar fraction. With further development of new ceramics with high proton conductivity and effective fabrication of thin film electrolyte, the SOFC based on proton-conducting electrolyte is expected to be a promising approach to convert ammonia fuel into electricity. © 2008 Elsevier B.V. All rights reserved.

Research Area(s)

  • Ammonia fuel, Electrochemical thermodynamics, Electrolyte, Proton-conducting ceramics, Solid oxide fuel cell (SOFC)

Citation Format(s)

Thermodynamic analysis of ammonia fed solid oxide fuel cells : Comparison between proton-conducting electrolyte and oxygen ion-conducting electrolyte. / Ni, Meng; Leung, Dennis Y. C.; Leung, Michael K. H.

In: Journal of Power Sources, Vol. 183, No. 2, 01.09.2008, p. 682-686.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review