Title :
Influence of the morphological and absorptive properties upon the electrochemical performance of phosphoric acid fuel cell gas diffusion electrodes
Author :
Giordano, N. ; Passalacqua, E. ; Alderucci, V. ; Staiti, P. ; Mirzaian, H. ; Recupero, V.
Author_Institution :
CNR Inst. for Transformation & Storage of Energy, Messina, Italy
Abstract :
The influence of the morphological-absorptive characteristics on the electrochemical activity of phosphoric acid fuel cell (PAFC) gas-diffusion electrodes (both anode and cathode) is presented. From porosimetric analysis and phosphoric acid absorption measurements, a set of parameters is derived relating the morphological structure of each catalyst layer and its absorptive capacity. The percentage of acid occupation (PAO) has been found to describe in a unified manner both the morphological and the absorptive characteristics of PAFC electrodes. The PAO is strongly influenced by the percentage of PTFE, whereas the sintering temperature exerts a lesser influence. A ratio of unity between the gas and liquid fraction of the total porosity (PAO=50%) is shown to be a prerequisite for the highest level of electrochemical performance of both cathodes and anodes
Keywords :
electrochemical electrodes; electrochemistry; fuel cells; H3PO4; PAFC; anode; catalyst; cathode; electrochemical electrodes; electrochemical performance; gas-diffusion electrodes; morphological-absorptive characteristics; percentage of acid occupation; phosphoric acid fuel cell; porosimetric analysis; porosity; Absorption; Anodes; Cathodes; Chemical technology; Electrodes; Energy storage; Fuel cells; Fuel storage; Mathematical model; Morphology;
Conference_Titel :
Energy Conversion Engineering Conference, 1989. IECEC-89., Proceedings of the 24th Intersociety
Conference_Location :
Washington, DC
DOI :
10.1109/IECEC.1989.74679
