Modelling and simulation of the degradation of perfluorinated ion-exchange membranes in PEM fuel cells
Shah, A.A, Ralph, T.R. and Walsh, F.C. (2009) Modelling and simulation of the degradation of perfluorinated ion-exchange membranes in PEM fuel cells. Journal of The Electrochemical Society, 156, (4), B465-B484. (doi:10.1149/1.3077573).
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A polymer-electrolyte membrane fuel cell model that incorporates chemical degradation in perlfluorinated sulfonic acid membranes is developed. The model is based on conservation principles and includes a detailed description of the transport phenomena. A degradation sub-model describes the formation of hydrogen peroxide \/\it via\/ distinct mechanisms in the cathode and anode, together with the subsequent formation of radicals \/\it via\/ Fenton reactions involving metal-ion impurities. The radicals participate in the decomposition of reactive end groups to form carboxylic acid, hydrogen fluoride and CO_2. Degradation proceeds through unzipping of the polymer backbone and cleavage of the side chains. Simulations are presented and the numerical code is shown to be extremely time efficient. Known trends with respect to operating conditions are qualitatively captured and the exhibited behaviour is shown to be robust to changes in the rate constants. The feasibility of a chemical degradation mechanism based on peroxide and radical formation is discussed.
|Keywords:||pfsa membrane degradation, modelling and simulation, pem fuel cell, peroxide, radical formation, unzipping, side chain cleavage|
|Subjects:||T Technology > TP Chemical technology
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Q Science > QA Mathematics > QA76 Computer software
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences > Thermofluids and Superconductivity
|Date Deposited:||18 Feb 2009|
|Last Modified:||27 Mar 2014 18:46|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
Available Versions of this Item
Modelling and simulation of the degradation of perfluorinated ion-exchange membranes in PEM fuel cells. (deposited 02 Mar 2009)
- Modelling and simulation of the degradation of perfluorinated ion-exchange membranes in PEM fuel cells. (deposited 18 Feb 2009) [Currently Displayed]
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