Robust Sub-Monolayers of Co<inf>3</inf>O<inf>4</inf> Nano-Islands: A Highly Transparent Morphology for Efficient Water Oxidation Catalysis

Liu, G; Karuturi, SK; Simonov, AN; Fekete, M; Chen, H; Nasiri, N; Le, NH; Reddy Narangari, P; Lysevych, M; Gengenbach, TR; Lowe, A; Tan, HH; Jagadish, C; Spiccia, L; Tricoli, A

Robust Sub-Monolayers of Co<inf>3</inf>O<inf>4</inf> Nano-Islands: A Highly Transparent Morphology for Efficient Water Oxidation Catalysis

Liu, G Karuturi, SK Simonov, AN Fekete, M Chen, H Nasiri, N

Le, NH Reddy Narangari, P Lysevych, M Gengenbach, TR Lowe, A Tan, HH Jagadish, C Spiccia, L Tricoli, A

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Publication Type:: Journal Article
Citation:: Advanced Energy Materials, 2016, 6 (15)
Issue Date:: 2016-08-10

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Field	Value	Language
dc.contributor.author	Liu, G	en_US
dc.contributor.author	Karuturi, SK	en_US
dc.contributor.author	Simonov, AN	en_US
dc.contributor.author	Fekete, M	en_US
dc.contributor.author	Chen, H	en_US
dc.contributor.author	Nasiri, N https://orcid.org/0000-0003-4738-098X	en_US
dc.contributor.author	Le, NH	en_US
dc.contributor.author	Reddy Narangari, P	en_US
dc.contributor.author	Lysevych, M	en_US
dc.contributor.author	Gengenbach, TR	en_US
dc.contributor.author	Lowe, A	en_US
dc.contributor.author	Tan, HH	en_US
dc.contributor.author	Jagadish, C	en_US
dc.contributor.author	Spiccia, L	en_US
dc.contributor.author	Tricoli, A	en_US
dc.date.issued	2016-08-10	en_US
dc.identifier.citation	Advanced Energy Materials, 2016, 6 (15)	en_US
dc.identifier.issn	1614-6832	en_US
dc.identifier.uri	http://hdl.handle.net/10453/122878
dc.description.abstract	© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The scalable synthesis of highly transparent and robust sub-monolayers of Co3O4 nano-islands, which efficiently catalyze water oxidation, is reported. Rapid aerosol deposition of Co3O4 nanoparticles and thermally induced self-organization lead to an ultra-fine nano-island morphology with more than 94% light transmission at a wavelength of 500 nm. These transparent sub-monolayers demonstrate a remarkable mass-weighted water oxidation activity of 2070–2350 A gCo3O4−1 and per-metal turnover frequency of 0.38–0.62 s−1 at an overpotential of 400 mV in 1 m NaOH aqueous solution. This mixed valent cobalt oxide structure exhibits excellent long-term electrochemical and mechanical stability preserving the initial catalytic activity over more than 12 h of constant current electrolysis and 1000 consecutive voltammetric cycles. The potential of the Co3O4 nano-islands for photoelectrochemical water splitting has been demonstrated by incorporation of co-catalysts in GaN nanowire photoanodes. The Co3O4-GaN photoanodes reveal significantly reduced onset overpotentials, improved photoresponse and photostability compared to the bare GaN ones. These findings provide a highly performing catalyst structure and a scalable synthesis method for the engineering of efficient photoanodes for integrated solar water-splitting cells.	en_US
dc.relation.ispartof	Advanced Energy Materials	en_US
dc.relation.isbasedon	10.1002/aenm.201600697	en_US
dc.title	Robust Sub-Monolayers of Co<inf>3</inf>O<inf>4</inf> Nano-Islands: A Highly Transparent Morphology for Efficient Water Oxidation Catalysis	en_US
dc.type	Journal Article
utslib.citation.volume	15	en_US
utslib.citation.volume	6	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	1007 Nanotechnology	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	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
utslib.copyright.status	closed_access
pubs.issue	15	en_US
pubs.publication-status	Published	en_US
pubs.volume	6	en_US

Abstract:

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The scalable synthesis of highly transparent and robust sub-monolayers of Co3O4 nano-islands, which efficiently catalyze water oxidation, is reported. Rapid aerosol deposition of Co3O4 nanoparticles and thermally induced self-organization lead to an ultra-fine nano-island morphology with more than 94% light transmission at a wavelength of 500 nm. These transparent sub-monolayers demonstrate a remarkable mass-weighted water oxidation activity of 2070–2350 A gCo3O4−1 and per-metal turnover frequency of 0.38–0.62 s−1 at an overpotential of 400 mV in 1 m NaOH aqueous solution. This mixed valent cobalt oxide structure exhibits excellent long-term electrochemical and mechanical stability preserving the initial catalytic activity over more than 12 h of constant current electrolysis and 1000 consecutive voltammetric cycles. The potential of the Co3O4 nano-islands for photoelectrochemical water splitting has been demonstrated by incorporation of co-catalysts in GaN nanowire photoanodes. The Co3O4-GaN photoanodes reveal significantly reduced onset overpotentials, improved photoresponse and photostability compared to the bare GaN ones. These findings provide a highly performing catalyst structure and a scalable synthesis method for the engineering of efficient photoanodes for integrated solar water-splitting cells.

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http://hdl.handle.net/10453/122878