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Electrocatalytic performance of Pb−Ru pyrochlore prepared by the amorphous citrate precursor method for bifunctional air electrodes

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Abstract

Pb−Ru pyrochlore has been of interest as bifunctional electrocatalyst for an air electrode. An amorphous citrate precursor (ACP) process has been optimized to prepare Pb−Ru pyrochlore powders with high surface areas with consequent improvement of its electrocatalytic performance in an air electrode. The surface area of the final powder is 30 m2/g, which is larger than the value obtained by the conventional hydroxide method. A PTEF-bonded gas diffusion electrode loaded with pyrochlore catalysts prepared by the ACP method showed good bifunctional performance. The electrode loaded with only 10 mg/cm2 of pyrochlore powder prepared by ACP showed good bifunctional performance, i.e. 100 mA/cm2 for oxygen reduction and 100 mA/cm2 for oxygen evolution, at 0.6 and 1.6 V vs. RHE, respectively. This performance compares well to the results from lower-area pyrochlore at much higher loading.

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Authors and Affiliations

  1. Mineral & Material Processing Division, Korea Institute of Geoscience & Mineral Resources, 30 Kajung-dong, Yusung-ku, 305-350, Taejon, Korea

    Churl Kyoung Lee

  2. College of Materials Science and Engineering, Seoul National University, San 56-1 Sinrim-9-dong, Kwanak-ku, 151-742, Seoul, Korea

    Hun-Joon Sohn

Authors
  1. Churl Kyoung Lee
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  2. Hun-Joon Sohn
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Lee, C.K., Sohn, HJ. Electrocatalytic performance of Pb−Ru pyrochlore prepared by the amorphous citrate precursor method for bifunctional air electrodes. Met. Mater. Int. 8, 215–219 (2002). https://doi.org/10.1007/BF03027021

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