dc.contributor.author | Bok, Sangho, 1972- | eng |
dc.contributor.author | Lubguban, Arnold A. | eng |
dc.contributor.author | Gao, Yuanfang | eng |
dc.contributor.author | Bhattacharya, Shantanu, 1974- | eng |
dc.contributor.author | Korampally, Venumadhav, 1972- | eng |
dc.contributor.author | Hossain, Maruf | eng |
dc.contributor.author | Gangopadhyay, Shubhra | eng |
dc.contributor.sponsor | National Institutes of Health | eng |
dc.date.issued | 2008 | eng |
dc.description.abstract | Carbon-based electrode materials have been widely used for many years for electrochemical charge storage, energy generation, and catalysis. We have developed an electrode material with high specific capacitance by entrapping graphite nanoparticles into a sol gel network. Films from the resulting colloidal suspensions were highly porous due to the removal of the entrapped organic solvents from sol-gel matrix giving rise to high Brunauer-Emmett-Teller (BET) specific surface areas (654 m2/g)and a high capacitance density (∼37 F/g). An exponential increase of capacitance was observed with decreasing scan rates in cyclic voltammetry studies on these films suggesting the presence of pores ranging from micro (< 2 nm) to mesopores. BET surface analysis and scanning electron microscope images of these films also confirmed the presence of the micropores as well as mesopores. A steep drop in the double layer capacitance with polar electrolytes was observed when the films were rendered hydrophilic upon exposure to a mild oxygen plasma. We propose a model whereby the microporous hydrophobic sol-gel matrix perturbs the hydration of ions which moves ions closer to the graphite nanoparticles and consequently increase the capacitance of the film. | eng |
dc.description.sponsorship | This work was supported by the National Institutes of Health grant NS048826. | eng |
dc.identifier.citation | Published in final edited form as: J Electrochem Soc. 2008 ; 155(5): K91-K95. | eng |
dc.identifier.other | doi:10.1149/1.2868772 | eng |
dc.identifier.uri | http://hdl.handle.net/10355/3904 | eng |
dc.language | English | eng |
dc.publisher | Electrochemical Society | eng |
dc.relation.ispartof | Electron Microscopy Core Facility publications (MU) | eng |
dc.relation.ispartofcommunity | University of Missouri-Columbia. Christopher S. Bond Life Sciences Center. Electron Microscopy Core Facility | eng |
dc.rights | OpenAccess | eng |
dc.rights.license | This work is licensed under a Creative Commons Attribution-NonCommerical-NoDerivs 3.0 License. | |
dc.source.uri | http://www.emc.missouri.edu/recpub.htm | eng |
dc.source.uri | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2572077/pdf/nihms-52150.pdf/?tool=pmcentrez | eng |
dc.subject.lcsh | Electrochemistry -- Experiments | eng |
dc.subject.lcsh | Scanning electron microscopy | eng |
dc.title | Electrochemical properties of carbon nanoparticles entrapped in silica matrix | eng |
dc.type | Preprint | eng |