Abstract
Perovskite La1-x Sr x MnO3 (LS x M) nanoparticles supported on Ketjen Black (KB) were synthesized as the cathode of anion-exchange membrane fuel cells. To reduce the particle size of LS x M and to improve the dispersivity on KB, a reverse micelle method was applied by using two kinds of non-ionic surfactants, i.e. polyethylene glycol nonyl-phenyl ether and polyethylene-glycol mono-4-nonylphenyl ether. 20 wt% L0.83S0.17M/KB prepared by the latter surfactant consisted of fine nanoparticles of LS0.17M (average diameter: ca. 4.3 nm), and exhibited a higher activity for oxygen reduction reaction than 45 wt% LS0.23M/KB prepared by a co-precipitation method in our previous report. A single cell using the 20 wt% LS0.17M/KB catalyst for cathode could be stably operated and gave the maximum power density of 129 mW cm-2, which was comparable to that using a conventional 46 wt% Pt/C as the cathode (138 mW cm-2).
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