Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201702320
Keywords
cobalt hydroxide; energy storage; hierarchical structures; hybrid materials
Categories
Funding
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-FG02-00ER45810]
- Center for Bio-Inspired Energy Science
- Energy Frontier Research Center - U.S. DOE, Office of Science, Basic Energy Sciences [DE-SC0000989]
- National Science Foundation [DMR-1121262]
- Air Force Research Laboratory [FA8650-15-2-5518]
- Department of Defense (DoD), Air Force Office of Scientific Research, through the National Defense Science and Engineering Graduate (NDSEG) Fellowship [32 CFR 168a]
- Northwestern University through Ryan Fellowship
- MRSEC program of the National Science Foundation at the Materials Research Center of Northwestern University [DMR-1121262]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF) [ECCS-1542205]
- MRSEC program (NSF) at the Materials Research Center [DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through IIN
- Cancer Center Support Grant [NCI CA060553]
- NSF [CHE-1048773]
- State of Illinois
- U.S. DOE [DE-AC02-06CH11357]
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In energy storage materials, large surface areas and oriented structures are key architecture design features for improving performance through enhanced electrolyte access and efficient electron conduction pathways. Layered hydroxides provide a tunable materials platform with opportunities for achieving such nanostructures via bottom-up syntheses. These nanostructures, however, can degrade in the presence of the alkaline electrolytes required for their redox-based energy storage. A layered Co(OH)(2)-organic hybrid material that forms a hierarchical structure consisting of micrometer-long, 30 nm diameter tubes with concentric curved layers of Co(OH)(2) and 1-pyrenebutyric acid is reported. The nanotubular structure offers high surface area as well as macroscopic orientation perpendicular to the substrate for efficient electron transfer. Using a comparison with flat films of the same composition, it is demonstrated that the superior performance of the nanotubular films is the result of a large accessible surface area for redox activity. It is found that the organic molecules used to template nanotubular growth also impart stability to the hybrid when present in the alkaline environments necessary for redox function.
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