Journal
NANO ENERGY
Volume 20, Issue -, Pages 315-325Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.11.030
Keywords
Non-spinet cobalt-manganese oxide; Carbon nanotubes; Oxygen reduction and evolution reactions; Primary and rechargeable zinc air batteries
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Funding
- MSIP (Ministry of Science, ICT and Future Planning), South Korea, under the ITRC (Information Technology Research Center) support program [NIPA-2014-H0301-13-1009]
- University at Buffalo
- U.S. Department of Energy, Fuel Cell Technologies Office (FCTO) Incubator Program [DE-EE0006960]
- SUNY
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Development of efficient bifunctional electrocatalysts from earth abundant elements, simultaneously active for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), remains to be a grand challenge for electrocatalysis. Herein we firstly synthesized a new type of bifunctional catalyst (NCNT/CoxMn1-xO) consisting of non-spinet cobalt-manganese oxide supported on N-doped carbon nanotubes through a simple non-surfactant assistant hydro thermal method. This hybrid catalyst exhibits much higher OER activity than that of IrO2, and comparable ORR activity to Pt/C with identical onset potential (0.96 V) in alkaline media. Furthermore, the NCNT/CoxMn1-xO catalyst was studied as a cathode in both primary and rechargeable zinc-air batteries demonstrating similar performance to commercial Pt/C or (Pt/C+IrO2), respectively. Primary zinc-air battery tests show a gravimetric energy density of 695 W h kg(zn)(-1), and the rechargeable battery exhibits a high round-trip efficiency evidenced by a low discharge-charge voltage gap (0.57 V) at a current density of 7 mA cm(-2). (C) 2015 Elsevier Ltd. All rights reserved.
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