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Highly ordered tailored three-dimensional hierarchical nano/microporous gold–carbon architectures

Sattayasamitsathit, Sirilak and O’Mahony, Aoife M. and Xiao, Xiaoyin and Brozik, Susan M. and Washburn, Cody M. and Wheeler, David R. and Gao, Wei and Minteer, Shelley and Cha, Jennifer and Burckel, D. Bruce and Polsky, Ronen and Wang, Joseph (2012) Highly ordered tailored three-dimensional hierarchical nano/microporous gold–carbon architectures. Journal of Materials Chemistry, 22 (24). pp. 11950-11956. ISSN 0959-9428. doi:10.1039/C2JM31485A.

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The preparation and characterization of three-dimensional hierarchical architectures, consisting of monolithic nanoporous gold or silver films formed on highly ordered 3D microporous carbon supports, are described. The formation of these nano/microporous structures involves the electrodeposition or sputtering of metal alloys onto the lithographically patterned multi-layered microporous carbon, followed by preferential chemical dealloying of the less noble component. The resulting hierarchical structure displays a highly developed 3D interconnected network of micropores with a nanoporous metal coating. Tailoring the nanoporosity of the metal films and the diameter of the large micropores has been accomplished by systematically changing the alloy compositions via control of the deposition potential, plating solution and coarsening time. SEM imaging illustrates the formation of unique biomimetic nanocoral- or nanocauliflower-like self-supporting structures, depending on the specific preparation conditions. The new 3D hierarchical nano/microporous architectures allow for enhanced mass transport and catalytic activity compared to common nanoporous films prepared on planar substrates. The functionality of this new carbon–gold hierarchical structure is illustrated for the greatly enhanced performance of enzymatic biofuel cells where a substantially higher power output is observed compared to the bare microporous carbon substrate.

Item Type:Article
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URLURL TypeDescription
Gao, Wei0000-0002-8503-4562
Additional Information:© 2012 Royal Society of Chemistry. Received 10th March 2012 , Accepted 13th April 2012. First published on 18th April 2012. This work was supported by the Laboratory Directed Research and Development program at Sandia National Laboratories and the National Science Foundation (Award Number CHE-1057562). A.O' M. was partially supported by DOE BES DE-SC0004937.
Funding AgencyGrant Number
Sandia National LaboratoriesUNSPECIFIED
Department of Energy (DOE)DE-SC0004937
Issue or Number:24
Record Number:CaltechAUTHORS:20180124-143807141
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84510
Deposited By: Ruth Sustaita
Deposited On:31 Jan 2018 22:27
Last Modified:15 Nov 2021 20:20

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