Journal
ACS NANO
Volume 9, Issue 4, Pages 4129-4137Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00267
Keywords
lithium oxygen batteries; nanostructures; molybdenum carbide nanoparticles; carbon nanotube; oxygen evolution reaction
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Funding
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Korea government Ministry of Trade, Industry and Energy [20124010203310]
- Global Frontier R&D Program of the Center for Hybrid Interface Materials (HIM) - Ministry of Science, ICT & Future Planning [2013M3A6B1078875]
- U.S. Department of Energy from Vehicle Technologies Office, Department of Energy, Office of Energy Efficiency and Renewable Energy [DE-AC0206CH11357]
- Division of Materials Science and Engineering, Basic Energy Science
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Although lithium oxygen batteries are attracting considerable attention because of the potential for an extremely high energy density, their practical use has been restricted owing to a low energy efficiency and poor cycle life compared to lithium-ion batteries. Here we present a nanostructured cathode based on molybdenum carbide nanoparticles (Mo2C) dispersed on carbon nanotubes, which dramatically increase the electrical efficiency up to 88% with a cycle life of more than 100 cycles. We found that the Mo2C nanoparticle catalysts contribute to the formation of well-dispersed lithium peroxide nanolayers (Li2O2) on the Mo2C/carbon nanotubes with a large contact area during the oxygen reduction reaction (ORR). This Li2O2 structure can be decomposed at low potential upon the oxygen evolution reaction (OER) by avoiding the energy loss associated with the decomposition of the typical Li2O2 discharge products.
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