Energy storage; Double layer capacitors; Graphene; Graphiteoxide; Carbon; Electrochemistry; Double layer capacitor
Hantel Moritz, Nesper Reinhard, Wokaun Alexander, Kötz Rüdiger (2014), In-situ XRD and dilatometry investigation of the formation of pillared graphene via electrochemical activation of partially reduced graphite oxide, in Electroctrochimica Acta
, 134, 459-470.
Hantel Moritz, Weingarth Daniel, Kötz Rüdiger (2014), Parameters determining dimensional changes of porous carbons during capacitive charging, in Carbon
, 69, 275-286.
Hantel Moritz, Kaspar Tommy, Nesper Reinhard, Kötz Rüdiger (2013), Partially reduced graphene oxide paper: A thin film electrode for electrochemical capacitors, in J. Electrochem. Soc.
, 160(4), A747-A750.
Hantel Moritz, Kaspar Tommy, Nesper Reinhard, Wokaun Alexander, Kötz Rüdiger (2013), Persistent Electrochemical Pillaring of Graphene Ensembles, in Electrochemistry Communications
, 34, 189-191.
M.M. Hantel, V. Presser, LK. McDonough, G. Feng, P.T. Cummings, Y. Gogotsi, R. Kötz (2012), In-situ electrochemical dilatometry of onion-like carbon and carbon black, in Journal of the Electrochemical Society
, 159(11), A1897-A1903.
Hantel Moritz, Kaspar Tommy, Nesper Rainhard, Wokaun Alexander, Kötz Rüdiger (2012), Partially reduced graphite oxide as anode for Li-Capacitors, in ECS Electrochemistry Letters
, 1(1), A1-A3.
Hantel Moritz, Kaspar Tommy, Nesper Rainhard, Wokaun Alexander, Kötz Rüdiger (2012), Partially reduced graphite oxide as electrode material for electrochemical double layer capacitors, in Chemistry European Journal
, Volume 18(Issue 29), 9125-9136.
Hantel Moritz, Kaspar Tommy, Nesper Rainhard, Wokaun ALexander, Kötz Rüdiger (2012), Partially reduced graphite oxide as electrode material for electrochemical double layer capacitors, in Chemistry European Journal
, 18(29), 9125-9136.
M.M. Hantel, V. Presser, R. Kötz, Y. Gogotsi (2011), In situ Electrochemical Dilatometry of Carbide-Derived Carbons, in Electrochemistry Communication
, 13, 1221-1224.
Hantel MM, Kaspar T, Nesper R, Wokaun A, Kotz R (2011), Partially reduced graphite oxide for supercapacitor electrodes: Effect of graphene layer spacing and huge specific capacitance, in ELECTROCHEMISTRY COMMUNICATIONS
, 13(1), 90-92.
Hantel Moritz, Platek Anetta, Kaspar Tommy, Nesper Reinhard, Wokaun Alexander, Kötz Rüdiger, Investigation of diluted ionic liquid 1-ethyl-3-methyl imidazolium tetrafluoroborate electrolytes for intercalation-like electrodes used in supercapacitors, in Electrochimica Acta
, 110, 234-239.
Graphene is a novel material with the highest surface to volume ratio imaginable. The theoretical specific surface area would be 2630 m2/g. Electrochemical double layer capaci-tors (EDLC), also called supercapacitors or ultracapacitors, stored the energy in the field of the electrochemical double layer at the solid electrolyte interface and not in the bulk of the material. This makes graphene the ideal electrode material for electrochemical double layer capacitors.The full utilization of the max. surface area of graphene would result in a specific capaci-tance of more than 200 F/g for the electrode material, which corresponds to a doubling of the specific capacitance of today’s carbon materials in organic electrolyte. Therefore it ap-pears to be straightforward to investigate the utilization of this material for the electro-chemical energy storage in electrochemical double layer capacitors. One aim of the project is the fundamental understanding of the key parameters for the en-ergy storage in EDLC type devices based on carbon. Graphene is the building block of all carbons and is expected to have particular properties in single, double and also tipple layer sheets. One fundamental question to be answered is to the possibility to utilize both sides of graphene for double layer storage. In addition, there exists a rich chemistry to modify these graphene materials. Such modifi-cation could affect the electronic conductivity of the material, which would be important for the performance as electrode material. Further, introduction of functional groups or side chains could contribute to additional so called pseudo-capacitance, which would fur-ther increase the energy density of EDLC devices. In essence, the improved fundamental understanding of graphene will contribute to the design of optimized carbon electrodes for EDLCs.Graphite oxide, which is for some preparation routs the precursor for graphene, is also an interesting candidate for electrochemical energy storage in the double layer and will be in-vestigated extensively as a possible electrode material for EDLCs. GOx is an expanded gra-phite with a significantly increased spacing between the graphene layers, with the spacers keeping the individual graphene layers stabilized.For GOx samples with increased layer spacing we already could demonstrate the so-called electric field activation, where the double layer capacitance of the material is increased significantly at a certain electrode potential.The handling and machining of these novel materials in electrodes of electrochemical stor-age devices has to be investigated and preparation routes will be developed. The project is a collaboration between the PSI and the ETHZ. The expertise concerning the investigation of the electrochemical performance of the graphene material in electrochemical capacitors exists in the group of R. Kötz in the Electrochemistry Laboratory at PSI, while the knowhow for preparation and modification of the material exists in the group of Prof. Nesper at ETHZ (NF-Projekt NF 200020-116568/1).