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Song, Hyun-Kon
eclat: electrochemistry lab of advanced technology
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Hierarchical urchin-shaped alpha-MnO2 on graphene-coated carbon microfibers: a binder-free electrode for rechargeable aqueous Na-air battery

Author(s)
Khan, ZiyauddinPark, SeungyoungHwang, Soo MinYang, JuchanLee, YoungsuSong, Hyun-KonKim, YoungsikKo, Hyunhyub
Issued Date
2016-07
DOI
10.1038/am.2016.104
URI
https://scholarworks.unist.ac.kr/handle/201301/20736
Fulltext
http://www.nature.com/am/journal/v8/n7/abs/am2016104a.html
Citation
NPG ASIA MATERIALS, v.8, pp.e294
Abstract
With the increasing demand of cost-effective and high-energy devices, sodium-air (Na-air) batteries have attracted immense interest due to the natural abundance of sodium in contrast to lithium. In particular, an aqueous Na-air battery has fundamental advantage over non-aqueous batteries due to the formation of highly water-soluble discharge product, which improve the overall performance of the system in terms of energy density, cyclic stability and round-trip efficiency. Despite these advantages, the rechargeability of aqueous Na-air batteries has not yet been demonstrated when using non-precious metal catalysts. In this work, we rationally synthesized a binder-free and robust electrode by directly growing urchin-shaped MnO2 nanowires on porous reduced graphene oxide-coated carbon microfiber (MGC) mats and fabricated an aqueous Na-air cell using the MGC as an air electrode to demonstrate the rechargeability of an aqueous Na-air battery. The fabricated aqueous Na-air cell exhibited excellent rechargeability and rate capability with a low overpotential gap (0.7 V) and high round-trip efficiency (81%). We believe that our approach opens a new avenue for synthesizing robust and binder-free electrodes that can be utilized to build not only metal-air batteries but also other energy systems such as supercapacitors, metal-ion batteries and fuel cells.
Publisher
NATURE PUBLISHING GROUP
ISSN
1884-4049
Keyword
OXYGEN REDUCTION REACTIONLITHIUM-ION BATTERIESMNO2 NANOSTRUCTURESDOPED GRAPHENEELECTROCHEMICAL PERFORMANCEENERGY CAPACITYCATALYSTSELECTROCATALYSTNANOSHEETSLI

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