Synthesis of a metallic mesoporous pyrochlore as a catalyst for lithium-O2 batteries

Title
Synthesis of a metallic mesoporous pyrochlore as a catalyst for lithium-O2 batteries
Authors
오시형Black, RobertPomerantseva, EkaterinaLee, Jin-HyonNazar, Linda F.
Keywords
lithium-air battery; catalyst; oxygen reduction reaction; oxygen evolution reaction; pyrochlore; metallic oxide; mesoporous
Issue Date
2012-12
Publisher
NATURE CHEMISTRY
Citation
VOL 4, NO 12, 1004-1010
Abstract
The lithium–O2 ‘semi-fuel’ cell based on the reversible reaction of Li and O2 to form Li2O2 can theoretically provide energy densities that exceed those of Li-ion cells by up to a factor of five. A key limitation that differentiates it from other lithium batteries is that it requires effective catalysts (or ‘promoters’) to enable oxygen reduction and evolution. Here, we report the synthesis of a novel metallic mesoporous oxide using surfactant templating that shows promising catalytic activity and results in a cathode with a high reversible capacity of 10,000 mAh g-1 (~1,000 mAh g-1 with respect to the total electrode weight including the peroxide product). This oxide also has a lower charge potential for oxygen evolution from Li2O2 than pure carbon. The properties are explained by the high fraction of surface defect active sites in the metallic oxide, and its unique morphology and variable oxygen stoichiometry. This strategy for creating porous metallic oxides may pave the way to new cathode architectures for the Li–O2 cell.
URI
http://pubs.kist.re.kr/handle/201004/44594
ISSN
17554330
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE