Seed-mediated atomic-scale reconstruction of silver manganate nanoplates for oxygen reduction towards high-energy aluminum-air flow batteries

Jaechan Ryu, Haeseong Jang, Joohyuk Park, Youngshin Yoo, Minjoon Park () and Jaephil Cho ()
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Jaechan Ryu: Ulsan National Institute of Science and Technology (UNIST)
Haeseong Jang: Ulsan National Institute of Science and Technology (UNIST)
Joohyuk Park: Ulsan National Institute of Science and Technology (UNIST)
Youngshin Yoo: Ulsan National Institute of Science and Technology (UNIST)
Minjoon Park: Ulsan National Institute of Science and Technology (UNIST)
Jaephil Cho: Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract Aluminum–air batteries are promising candidates for next-generation high-energy-density storage, but the inherent limitations hinder their practical use. Here, we show that silver nanoparticle-mediated silver manganate nanoplates are a highly active and chemically stable catalyst for oxygen reduction in alkaline media. By means of atomic-resolved transmission electron microscopy, we find that the formation of stripe patterns on the surface of a silver manganate nanoplate originates from the zigzag atomic arrangement of silver and manganese, creating a high concentration of dislocations in the crystal lattice. This structure can provide high electrical conductivity with low electrode resistance and abundant active sites for ion adsorption. The catalyst exhibits outstanding performance in a flow-based aluminum–air battery, demonstrating high gravimetric and volumetric energy densities of ~2552 Wh kgAl−1 and ~6890 Wh lAl−1 at 100 mA cm−2, as well as high stability during a mechanical recharging process.

Date: 2018
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DOI: 10.1038/s41467-018-06211-3

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