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Liu, Meilin
Liu Research Group
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  • Fuel Cells

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Ketjenblack Carbon Supported Amorphous Manganese Oxides Nanowires as Highly Efficient Electrocatalyst for Oxygen Reduction Reaction in Alkaline Solutions

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Title
Ketjenblack Carbon Supported Amorphous Manganese Oxides Nanowires as Highly Efficient Electrocatalyst for Oxygen Reduction Reaction in Alkaline Solutions
Author
Lee, Jang-SooPark, Gi SuLee, Ho IlKim, Sun TaiCao, RuiguoLiu, MeilinCho, Jaephil
Keywords
Oxygen reduction reaction; amorphous manganese oxide nanowire; Ketjenblack carbon; electrical conductivity; Zn-air battery
Issue Date
2011-12
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.11, no.12, pp.5362 - 5366
Abstract
A composite air electrode consisting of Ketjenblack carbon (KB) supported amorphous manganese oxide (MnOx) nanowires, synthesized via a polyol method, is highly efficient for the oxygen reduction reaction (ORR) in a Zn-air battery. The low-cost and highly conductive KB in this composite electrode overcomes the limitations due to low electrical conductivity of MnOx while acting as a supporting matrix for the catalyst. The large surface area of the amorphous MnOx nanowires, together with other microscopic features (e.g., high density of surface defects), potentially offers more active sites for oxygen adsorption, thus significantly enhancing ORR activity. In particular, a Zn-air battery based on this composite air electrode exhibits a peak power density of similar to 190 mW/cm(2), which is far superior to those based on a commercial air cathode with Mn(3)O(4) catalysts.
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DOI
10.1021/nl202907B
ISSN
1530-6984
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ECHE_Journal Papers
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