Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 5, Pages 2037-2044Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta09375b
Keywords
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Funding
- National Research Foundation of Korea [2015R1A2A1A10054152]
- Ministry of Trade, Industry and Energy [10064058]
- Research Fund of UNIST (Ulsan National Institute of Science and Technology) [1.160004.01]
- National Research Foundation of Korea [2015R1A2A1A10054152] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Binder-free and bifunctional electrocatalysts have vital roles in the development of high-performance metal-air batteries. Herein, we synthesized a vanadium oxide (VO2) nanostructure as a novel binder-free and bifunctional electrocatalyst for a rechargeable aqueous sodium-air (Na-air) battery. VO2 nanostructures were grown on reduced graphene oxide coated on carbon paper, which had a carambola morphology. We confirmed the bifunctional nature of VO2 nanostructures by analyzing their electrocatalytic activity associated with the oxygen reduction reaction and oxygen evolution reaction. The reaction pathway associated with electrocatalytic activity was also affirmed by computational modeling and simulation studies. Thereafter, an aqueous Na-air cell was built using novel binder-free VO2 nanostructures as the air electrode. The fabricated cell displayed a 0.64 V overpotential gap, 104 mW g(-1) power density at 80 mA g(-1) current density, 81% round trip efficiency and good cyclic stability up to 50 cycles.
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