Mn<inf>3</inf>O<inf>4</inf>@CoMn<inf>2</inf>O<inf>4</inf>-Co<inf>x</inf>O<inf>y</inf> Nanoparticles: Partial Cation Exchange Synthesis and Electrocatalytic Properties toward the Oxygen Reduction and Evolution Reactions

Zhishan Luo, Erdem Irtem, Maria Ibánez, Raquel Nafria, Sara Martĺ-Sánchez, Aziz Genç, Maria De La Mata, Yu Liu, Doris Cadavid, Jordi Llorca, Jordi Arbiol, Teresa Andreu, Joan Ramon Morante, Andreu Cabot

    Research output: Contribution to journalArticleResearchpeer-review

    37 Citations (Scopus)

    Abstract

    © 2016 American Chemical Society. Mn3O4@CoMn2O4 nanoparticles (NPs) were produced at low temperature and ambient atmosphere using a one-pot two-step synthesis protocol involving the cation exchange of Mn by Co in preformed Mn3O4 NPs. Selecting the proper cobalt precursor, the nucleation of CoxOy crystallites at the Mn3O4@CoMn2O4 surface could be simultaneously promoted to form Mn3O4@CoMn2O4-CoxOy NPs. Such heterostructured NPs were investigated for oxygen reduction and evolution reactions (ORR, OER) in alkaline solution. Mn3O4@CoMn2O4-CoxOy NPs with [Co]/[Mn] = 1 showed low overpotentials of 0.31 V at -3 mA·cm-2 and a small Tafel slope of 52 mV·dec-1 for ORR, and overpotentials of 0.31 V at 10 mA·cm-2 and a Tafel slope of 81 mV·dec-1 for OER, thus outperforming commercial Pt-, IrO2-based and previously reported transition metal oxides. This cation-exchange-based synthesis protocol opens up a new approach to design novel heterostructured NPs as efficient nonprecious metal bifunctional oxygen catalysts.
    Original languageEnglish
    Pages (from-to)17435-17444
    JournalACS Applied Materials and Interfaces
    Volume8
    Issue number27
    DOIs
    Publication statusPublished - 13 Jul 2016

    Keywords

    • cation exchange
    • cobalt oxide
    • colloidal
    • electrocatalysis
    • manganese oxide
    • nanoparticle
    • OER
    • ORR

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    Luo, Z., Irtem, E., Ibánez, M., Nafria, R., Martĺ-Sánchez, S., Genç, A., De La Mata, M., Liu, Y., Cadavid, D., Llorca, J., Arbiol, J., Andreu, T., Morante, J. R., & Cabot, A. (2016). Mn<inf>3</inf>O<inf>4</inf>@CoMn<inf>2</inf>O<inf>4</inf>-Co<inf>x</inf>O<inf>y</inf> Nanoparticles: Partial Cation Exchange Synthesis and Electrocatalytic Properties toward the Oxygen Reduction and Evolution Reactions. ACS Applied Materials and Interfaces, 8(27), 17435-17444. https://doi.org/10.1021/acsami.6b02786