Morphology and electrochemistry of ruthenium/carbon aerogel nanostructures
- Univ. of California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering
The structure-property relationships of nanostructured Ru/carbon aerogel composite materials have been evaluated. These new materials were prepared via a novel two-step metal vapor impregnation method which enables one to control the Ru loading through repetition of the process. The resulting microstructure is characterized by highly dispersed Ru particles ({approx}20--30 {angstrom} in diameter) attached to the carbon aerogel surface and distributed homogeneously throughout the material; the open pore structure of the carbon aerogels remains largely unaffected. Electrochemical characterization indicates that it is possible to increase the specific capacitance of the carbon aerogels in 1.0 M H{sub 2}SO{sub 4} from {approx}100 F/g to greater than 250 F/g for samples with >50 wt % Ru due to the pseudocapacitive properties of hydrous RuO{sub 2}. A volumetric capacitance greater than 140 F/cm{sup 3} was observed for some samples. In addition, these materials show good cycling characteristics. Electrochemical impedance spectroscopy was unable to distinguish between double-layer capacitance and pseudocapacitance in these materials.
- Sponsoring Organization:
- Lawrence Livermore National Lab., CA (United States); Office of Naval Research, Washington, DC (United States)
- OSTI ID:
- 680010
- Report Number(s):
- CONF-980314-; ISSN 0743-7463; TRN: IM9941%%51
- Journal Information:
- Langmuir, Vol. 15, Issue 3; Conference: American Chemical Society (ACS) meeting, Dallas, TX (United States), 26 Mar - 2 Apr 1998; Other Information: PBD: 2 Feb 1999
- Country of Publication:
- United States
- Language:
- English
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