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• W2034239862 abstract "Abstract Developing efficient electrocatalysts for the oxygen reduction reaction (ORR) is critical for promoting the widespread application of fuel cells and metal–air batteries. Here, we develop a biological low‐cost, ecofriendly method for the synthesis of Mn 2 O 3 micro‐/nanocubes by calcination of MnCO 3 precursors in an oxygen atmosphere. Microcubic MnCO 3 precursors with an edge length of 2.5 μm were fabricated by dissimilatory metal‐reducing Shewanella loihica PV‐4 in the presence of MnO 4 − as the sole electron acceptor under anaerobic conditions. After calcining the MnCO 3 precursors at 500 and 700 °C, porous Mn 2 O 3 ‐500 and Mn 2 O 3 ‐700 also showed microcubic morphology, while their edge lengths decreased to 1.8 μm due to thermal decomposition. Moreover, the surfaces of the Mn 2 O 3 microcubes were covered by granular nanoparticles with average diameters in the range of 18–202 nm, depending on the calcination temperatures. Electrochemical measurements demonstrated that the porous Mn 2 O 3 ‐500 micro‐/nanocubes exhibit promising catalytic activity towards the ORR in an alkaline medium, which should be due to a synergistic effect of the overlapping molecular orbitals of oxygen/manganese and the hierarchically porous structures that are favorable for oxygen absorption. Moreover, these Mn 2 O 3 micro‐/nanocubes possess better stability than commercial Pt/C catalysts and methanol‐tolerance property in alkaline solution. Thus the Shewanella ‐mediated biosynthesis method we provided here might be a new strategy for the preparation of various transition metal oxides as high‐performance ORR electrocatalysts at low cost." @default.
• W2034239862 created "2016-06-24" @default.
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• W2034239862 date "2014-11-25" @default.
• W2034239862 modified "2023-10-18" @default.
• W2034239862 title "<i>Shewanella</i>-mediated Biosynthesis of Manganese Oxide Micro-/Nanocubes as Efficient Electrocatalysts for the Oxygen Reduction Reaction" @default.
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• W2034239862 doi "https://doi.org/10.1002/cssc.201402759" @default.
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