Nanographene Aerogels: Size Effect of the Precursor Graphene Oxide on Gelation Process and Electrochemical Properties

Kudo, Akira; Campbell, Patrick G.; Biener, Juergen

doi:10.1002/cnma.201700292

Title: Nanographene Aerogels: Size Effect of the Precursor Graphene Oxide on Gelation Process and Electrochemical Properties

Journal Article · Mon Dec 25 00:00:00 EST 2017 · ChemNanoMat

DOI:https://doi.org/10.1002/cnma.201700292· OSTI ID:1502032

Kudo, Akira ^[1]; Campbell, Patrick G. ^[2]; Biener, Juergen ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Materials Science and Engineering
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Science Directorate

Improving the electrochemical properties of graphene aerogels (GAs) without doping or making composites is an attractive synthetic strategy. Here in this work we report on the effects of graphene sheet dimensions on the properties of GAs. Nanographene aerogels (nG-AGs) were synthesized using nanographene oxide (nGO) powder with a mean platelet diameter of 90 nm. In-situ Fourier transform infrared spectroscopy (FTIR) during gelation revealed a longer fast-gelation regime for nG-AGs than for stdG-AGs. The surface-area-normalized capacitance of nG-AGs calculated from cyclic voltammetry is 16% higher than that of stdG-AGs, and the onset of hydrogen evolution is observed at a lower over-potential. These observations can be attributed to increased density of edge sites and defects in nanographene sheets. Our results imply that the diameter of the precursor graphene sheets can be used as a parameter to optimize the electrochemical properties of graphene AGs depending on the application.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1502032

Report Number(s):: LLNL-JRNL-737729; 890801

Journal Information:: ChemNanoMat, Vol. 4, Issue 4; ISSN 2199-692X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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