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Issue 43, 2013
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Enhanced oxygen reduction reaction with nano-scale pyrochlore bismuth ruthenate via cost-effective wet-chemical synthesis

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Abstract

Pyrochlore ruthenate oxides are promising electrocatalytic materials for lower temperature solid oxide fuel cell (LT-SOFC) cathodes due to their high catalytic activity toward oxygen reduction reaction (ORR) which is the major rate-limiting step at reduced temperatures (below 750 °C). Here we report for the first time highly pure pyrochlore bismuth ruthenate (Bi2Ru2O7, BRO7) synthesized via a practical and cost-effective glycine–nitrate (GNC) combustion method. The synthesis parameters including glycine to nitrate ratio and calcination conditions were systematically optimized, resulting in nanoparticles with crystallite size of ∼30 nm and significant reduction in synthesis steps. Incorporating the synthesized BRO7 nanoparticles with highly conductive bismuth oxide as an SOFC cathode results in significant enhancement of ORR, showing 9 times lower SOFC cathode area specific resistance, compared to that of BRO7 via conventional solid-state reaction. Thus, this result demonstrates the feasibility of BRO7 nanoparticles via GNC to enhance the ORR for lower temperature SOFC applications.

Graphical abstract: Enhanced oxygen reduction reaction with nano-scale pyrochlore bismuth ruthenate via cost-effective wet-chemical synthesis

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Publication details

The article was received on 21 Jun 2013, accepted on 27 Aug 2013 and first published on 29 Aug 2013


Article type: Communication
DOI: 10.1039/C3RA44633F
Citation: RSC Adv., 2013,3, 19866-19871
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    Enhanced oxygen reduction reaction with nano-scale pyrochlore bismuth ruthenate via cost-effective wet-chemical synthesis

    K. T. Lee, B. W. Lee, M. A. Camaratta and E. D. Wachsman, RSC Adv., 2013, 3, 19866
    DOI: 10.1039/C3RA44633F

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