Tunable Biogenic Manganese Oxides

Alexandr N. Simonov, Rosalie K. Hocking, Lizhi Tao, Thomas Gengenbach, Timothy Williams, Xi Ya Fang, Hannah J. King, Shannon A. Bonke, Dijon A. Hoogeveen, Christine A. Romano, Bradley M. Tebo, Lisandra L. Martin, William H. Casey, Leone Spiccia

    Research output: Contribution to journalArticlepeer-review

    7 Scopus citations


    Influence of the conditions for aerobic oxidation of catalysed by the MnxEFG protein complex on the morphology, structure and reactivity of the resulting biogenic manganese oxides (MnOx) is explored. Physical characterisation of MnOx includes scanning and transmission electron microscopy, and X-ray photoelectron and K-edge Mn, Fe X-ray absorption spectroscopy. This characterisation reveals that the MnOx materials share the structural features of birnessite, yet differ in the degree of structural disorder. Importantly, these biogenic products exhibit strikingly different morphologies that can be easily controlled. Changing the substrate-to-protein ratio produces MnOx either as nm-thin sheets, or rods with diameters below 20 nm, or a combination of the two. Mineralisation in solutions that contain makes solids with significant disorder in the structure, while the presence of facilitates formation of more ordered materials. The (photo)oxidation and (photo)electrocatalytic capacity of the MnOx minerals is examined and correlated with their structural properties.

    Original languageEnglish (US)
    Pages (from-to)13482-11349
    Number of pages2134
    JournalChemistry - A European Journal
    Issue number54
    StatePublished - Sep 27 2017


    • MnxEFG protein complex
    • biogenic materials
    • manganese
    • structural disorder
    • structure elucidation
    • tunable morphology

    ASJC Scopus subject areas

    • Catalysis
    • Organic Chemistry


    Dive into the research topics of 'Tunable Biogenic Manganese Oxides'. Together they form a unique fingerprint.

    Cite this