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    Anchoring perovskite LaMnO3 nanoparticles on biomass−derived N, P co−doped porous carbon for efficient oxygen reduction

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    Authors
    Hu, J.
    Shi, Z.
    Su, Chao
    Lu, B.
    Shao, Zongping
    Huang, H.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Hu, J. and Shi, Z. and Su, C. and Lu, B. and Shao, Z. and Huang, H. 2018. Anchoring perovskite LaMnO3 nanoparticles on biomass−derived N, P co−doped porous carbon for efficient oxygen reduction. Electrochimica Acta. 274: pp. 40-48.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2018.04.081
    ISSN
    0013-4686
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/66721
    Collection
    • Curtin Research Publications
    Abstract

    We propose a new perovskite/carbon composite of LaMnO 3 nanoparticles anchored on N and P co-doped porous carbon as an efficient electrocatalyst for oxygen reduction reaction (ORR) in alkaline solution. A facile two-step method is applied for the synthesis of such composite, involving the pyrolysis of cheap, abundant and renewable natural okara with the formation of N and P co-doped porous carbon for the first step, and the deposition of LaMnO 3 nanoparticles on the carbon surface by sol-gel synthesis at the second step. A synergistic effect is built between the LaMnO 3 nanoparticles and the porous carbon substrate, resulting in obviously improved ORR activity as compared with the individual N, P co-doped carbon and the nanosized LaMnO 3 electrocatalysts, in terms of onset potential, limiting current density, and stability. The LaMnO 3 /N, P co-doped carbon composites further evaluated as an air electrode in a Zn-air battery, demonstrating attractive performance, including high discharge voltage plateau (~1.2 V) and excellent stability with negligible degradation in voltage at 25 mA cm -1 discharge current for 24 h. The present results highly promise the LaMnO 3 /biocarbon nanocomposite as a potential metal-free ORR electrocatalyst, which may find a wide use in metal-air batteries or fuel cells.

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