N-doped pierced graphene microparticles as a highly active electrocatalyst for li-air batteries
Data(s) |
13/04/2015
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Resumo |
In this work we report a novel scalable strategy to prepare a lithium-air battery electrode from 3D Ndoped pierced graphene microparticles (N-PGM) with highly active performance. This approach has combined the merits of spray drying technology and the hard template method. The pierced structured graphene microparticles were characterized physically and electrochemically. An x-ray<br />photoelectron spectrometer and Raman spectra have revealed that the novel structure possesses a higher N-doping level than conventional graphene without the pierced structure. A much higher BET surface area was also achieved for the N-PGMthan the conventional N-doped graphene microparticles (N-GM). Cyclic voltammetry indicated that the lithium-air battery with the N-PGM electrode has a better utilization for the graphene mass and a higher void volume for Li2O2 formation than that of theN-GMelectrode. N-PGMalso exhibits improved decomposition kinetics for Li oxide<br />species yielded in the cathodic reaction. Charge and discharge measurements showed that theN-PGM lithium-air battery achieved an improved specific capacity and an enhanced cycle performance than when anN-GMelectrode is used. |
Identificador | |
Idioma(s) |
eng |
Publicador |
IOP Publishing |
Relação |
http://dro.deakin.edu.au/eserv/DU:30082322/razal-ndopedpierced-post-2015.pdf http://www.dx.doi.org/10.1088/2053-1583/2/2/024002 |
Direitos |
2015, IOP Publishing |
Palavras-Chave | #Science & Technology #Technology #Materials Science, Multidisciplinary #Materials Science #graphene #N-doping #Li-air battery #pierced structure #hard template method #NONAQUEOUS LI-O-2 BATTERIES #NANOTUBE ARRAYS #LITHIUM #SHEETS #CARBON #ELECTROLYTES #STABILITY #COMPOSITE #CHEMISTRY #CATALYSTS |
Tipo |
Journal Article |