Hierarchical Ru nanospheres as highly effective cathode catalysts for Li-O<inf>2</inf> batteries

Su, DW; Dou, SX; Wang, GX

Hierarchical Ru nanospheres as highly effective cathode catalysts for Li-O<inf>2</inf> batteries

Su, DW

Dou, SX Wang, GX

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Publication Type:: Journal Article
Citation:: Journal of Materials Chemistry A, 2015, 3 (36), pp. 18384 - 18388
Issue Date:: 2015-08-11

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Field	Value	Language
dc.contributor.author	Su, DW https://orcid.org/0000-0002-3972-8205	en_US
dc.contributor.author	Dou, SX	en_US
dc.contributor.author	Wang, GX https://orcid.org/0000-0003-4295-8578	en_US
dc.date.issued	2015-08-11	en_US
dc.identifier.citation	Journal of Materials Chemistry A, 2015, 3 (36), pp. 18384 - 18388	en_US
dc.identifier.issn	2050-7488	en_US
dc.identifier.uri	http://hdl.handle.net/10453/123370
dc.description.abstract	© The Royal Society of Chemistry. Carbon-free, hierarchical Ru nanospheres are reported as an effective cathode catalyst for Li-O2 batteries. The hierarchical Ru nanospheres were synthesized by a simple one-step hydrothermal method. As evaluated by electrochemical measurements, it was found that the carbon-free hierarchical Ru nanosphere cathode can significantly reduce discharge and charge overpotential (∼0.3 V with the capacity limited to 1000 mA h g-1) with a high discharge capacity of 3445 mA h g-1 at a current density of 200 mA g-1 (ORR). This superior oxygen evolution reaction (OER) and oxygen reduction reaction catalytic performance can be maintained over long time cycling at different current densities. Ex situ scanning electron microscopy, X-ray diffraction, and Raman measurements reveal that leaf-shaped Li2O2 is the only reaction product during the discharge process, and the hierarchical Ru nanospheres can effectively decompose the Li2O2 discharge product, facilitate the OER, and promote a high round-trip efficiency. Therefore, the carbon-free hierarchical Ru nanospheres are a promising cathode catalyst for rechargeable Li-O2 batteries with low charge overpotential, long cycle life, and high specific capacity.	en_US
dc.relation.ispartof	Journal of Materials Chemistry A	en_US
dc.relation.isbasedon	10.1039/c5ta05486a	en_US
dc.title	Hierarchical Ru nanospheres as highly effective cathode catalysts for Li-O<inf>2</inf> batteries	en_US
dc.type	Journal Article
utslib.citation.volume	36	en_US
utslib.citation.volume	3	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	0915 Interdisciplinary Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
utslib.copyright.status	closed_access
pubs.issue	36	en_US
pubs.publication-status	Published	en_US
pubs.volume	3	en_US

Abstract:

© The Royal Society of Chemistry. Carbon-free, hierarchical Ru nanospheres are reported as an effective cathode catalyst for Li-O2 batteries. The hierarchical Ru nanospheres were synthesized by a simple one-step hydrothermal method. As evaluated by electrochemical measurements, it was found that the carbon-free hierarchical Ru nanosphere cathode can significantly reduce discharge and charge overpotential (∼0.3 V with the capacity limited to 1000 mA h g-1) with a high discharge capacity of 3445 mA h g-1 at a current density of 200 mA g-1 (ORR). This superior oxygen evolution reaction (OER) and oxygen reduction reaction catalytic performance can be maintained over long time cycling at different current densities. Ex situ scanning electron microscopy, X-ray diffraction, and Raman measurements reveal that leaf-shaped Li2O2 is the only reaction product during the discharge process, and the hierarchical Ru nanospheres can effectively decompose the Li2O2 discharge product, facilitate the OER, and promote a high round-trip efficiency. Therefore, the carbon-free hierarchical Ru nanospheres are a promising cathode catalyst for rechargeable Li-O2 batteries with low charge overpotential, long cycle life, and high specific capacity.

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http://hdl.handle.net/10453/123370