首页|Oxygen Reduction Reaction Activity of Pyrochlore Oxide Electrocatalysts Prepared by Precipitation Method

Oxygen Reduction Reaction Activity of Pyrochlore Oxide Electrocatalysts Prepared by Precipitation Method

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  • Trans Tech Publications Ltd
The Mn-doped pyrochlores Pb_2Ru_(1.5)Mn_(0.5)O_(7-δ) (PRMns) samples were synthesized by a precipitation method, followed by heat-treatments at temperatures of 300-800℃. Effects of the heat-treatments on their electrocatalytic activities for oxygen reduction reaction (ORR) were examined by semi-steady state voltammetry with a rotating ring-disk electrode in 0.1 M KOH solution at 70℃. The PRMns showed the best ORR activity for the 500℃-heat-treated PRMn. The onset potential of the ORR current was over 1.0 V vs RHE, and the efficiency of 4-electron reduction was almost 100%. The maximum in the ORR activity for the 500℃-heat-treated PRMn resulted from a trade-off effect between their crystallinity and specific surface areas.

pyrochloreelectrocatalystORRfuel cellruthenate

Hideki KAWAI、Kenji YOSHIHARA、Takayuki KONISHI、Morihiro SAITO、Jun KUWANO、Hidenobu SHIROISHI

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Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, 12-1 Ichigayafunagawara-machi, Shinjyuku-ku, Tokyo 162-0826, Japan

Department of Chemical Science and Engineering, Tokyo National College of Technology, Kunigida, Hachioji, Tokyo, 1220-2, Japan

2010

10.4028/www.scientific.net/KEM.421-422.479

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.421/422
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