Journal
NANOTECHNOLOGY
Volume 22, Issue 39, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/22/39/395402
Keywords
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Funding
- Ministry of Education, Science Technology (MEST)
- National Research Foundation of Korea (NRF)
- Basic Research Laboratories (BRL) [2011-0001567]
- Ministry of Public Safety & Security (MPSS), Republic of Korea [C1090-1100-0002] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [핵09B1507, 2009-0085441] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Nanorods with an alpha type MnO2 structure and a diameter ranging from 25 to 40 nm, along with tipped needles with a beta MnO2 structure and a diameter of 100 nm were obtained. The 25 nm diameter alpha MnO2 nanorods showed the best catalytic activity for dissociation of HO2- formed during oxygen reduction in a KOH solution. The MnO2 nanostructures preferably followed a two-electron oxygen reduction mechanism in a LiOH solution. The size of the catalyst also affected the specific capacities of the non-aqueous Li/O-2 batteries fabricated using the MnO2 based air electrode. The highest specific capacity of 1917 mA h g(-1) was obtained for an alpha MnO2 nanorod catalyst having a diameter of 25 nm. The cation present in the MnO2 nanostructures appears to determine the catalytic activity of MnO2.
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