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Effects of curing condition of solution cast Nafion® membranes on PEMFC performance
Singaram Vengatesan,김형준,임태훈,Eunae Cho 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
To study the feasibility of applying solution-cast membranes to polymer electrolyte membrane fuel cells (PEMFCs), single cells prepared with solution-cast membranes were tested. The solution cast membranes were fabricated from a commercial Nafion solution under various conditions. Effects of annealing temperature on characteristics of the solution-cast membranes were investigated by measuring water uptake and ionic conductivity of the membranes. Performance of the single cells using the prepared solution cast membranes was evaluated in terms of i-V curves, Nyquist plots, and H2 crossover current density. Based on the results, solution-cast membranes were fabricated by being cured at 150℃ for different hours to examine effects of curing time on cell performance. Finally, durability of solutioncast membranes was investigated with operating the single cells for 1,000 hr.
Singaram Vengatesan,조은애,오인환 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.5
Active and stable cobalt-based non-precious metal catalysts for the oxygen reduction reaction (ORR) in PEM fuel cells were developed through high-temperature pyrolysis of metal-porphyrins supported on carbon. The roles of substituted porphyrins, carbon support, and catalyst loading on ORR activity were studied using rotating disc electrode (RDE) measurements. It was observed that the carbon support plays a major role in improving the catalytic activity. The results showed that among the supported catalysts, the homemade mesocarbon-supported cobalt-porphyrin catalyst with 20 wt% loading displayed higher ORR activity; the cell performance showed maximum current density of 1.1 A cm−2 at 0.13 V in H2/O2 fuel cells.