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- Title
Robust Sub-Monolayers of Co<sub>3</sub>O<sub>4</sub> Nano-Islands: A Highly Transparent Morphology for Efficient Water Oxidation Catalysis.
- Authors
Liu, Guanyu; Karuturi, Siva Krishna; Simonov, Alexandr N.; Fekete, Monika; Chen, Hongjun; Nasiri, Noushin; Le, Nhien H.; Reddy Narangari, Parvathala; Lysevych, Mykhaylo; Gengenbach, Thomas R.; Lowe, Adrian; Tan, Hark Hoe; Jagadish, Chennupati; Spiccia, Leone; Tricoli, Antonio
- Abstract
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.
- Subjects
MONOMOLECULAR films; OXIDATION of water; CATALYSIS; CHEMISTRY; NANOSTRUCTURED materials
- Publication
Advanced Energy Materials, 2016, Vol 6, Issue 15, pn/a
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201600697