Projekt

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Graphitoxide und Graphen für die elektrochemische Energiespeicherung

Titel Englisch Graphite Oxides and Graphene for Electrochemical Energy Storage
Gesuchsteller/in Kötz Rüdiger
Nummer 126855
Förderungsinstrument Projektförderung (Abt. I-III)
Forschungseinrichtung Labor für Elektrochemie Paul Scherrer Institut
Hochschule Paul Scherrer Institut - PSI
Hauptdisziplin Physikalische Chemie
Beginn/Ende 01.01.2010 - 31.05.2013
Bewilligter Betrag 278'577.00
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Alle Disziplinen (4)

Disziplin
Physikalische Chemie
Organische Chemie
Physik der kondensierten Materie
Anorganische Chemie

Keywords (7)

Energy storage; Double layer capacitors; Graphene; Graphiteoxide; Carbon; Electrochemistry; Double layer capacitor

Lay Summary (Englisch)

Lead
Lay summary
Supercapacitors (SC) are electrochemical energy storage devices, which store the energy in the electric field of the electrochemical double layer at the electrode electrolyte interface. While SCs are characterized by a high power density and long cycle life their energy is limited by the available electrode surface. Graphene is a novel carbon material with the larges surface to mass ratio. In this project the suitability of graphene electrodes for supercapacitor application will be investigated.Energy storage is the most promising technology to reduce fuel consumption in the transport sector. Electrochemical energy storage devices such as batteries and supercapacitors (SC), contribute to a significant portion of today's energy storage techniques. Supercapacitors - also called Ultracapacitors or Electrochemical Double Layer Capacitors - store the energy in the electric field of the electrochemical double layer at the solid electrolyte interface and not like batteries in the bulk of the material. As a consequence the amount of charge to be stored depends mainly on the available surface area of the electrode material.Graphene is a novel 2-dimensional carbon material with the highest surface to mass ratio imaginable. This makes graphene the ideal electrode material for electrochemical double layer capacitors provided all of this surface area could be utilized for charge storage.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 in this project is to the possibility to utilize both sides of graphene for double layer storage. The making of a graphene type electrode presumes, that the prepared graphene sheets do not agglomerate during electrode preparation. Therefore ways have to be found which prevent the agglomeration of these graphene sheets by introducing chemical spacers. In addition, there exists a rich chemistry to modify these graphene materials. Such modification 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 further increase the energy density of SC devices.
Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende

Mitarbeitende

Publikationen

Publikation
In-situ XRD and dilatometry investigation of the formation of pillared graphene via electrochemical activation of partially reduced graphite oxide
(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.
Parameters determining dimensional changes of porous carbons during capacitive charging
(2014), Parameters determining dimensional changes of porous carbons during capacitive charging, in Carbon, 69, 275-286.
Partially reduced graphene oxide paper: A thin film electrode for electrochemical capacitors
(2013), Partially reduced graphene oxide paper: A thin film electrode for electrochemical capacitors, in J. Electrochem. Soc., 160(4), A747-A750.
Persistent Electrochemical Pillaring of Graphene Ensembles
(2013), Persistent Electrochemical Pillaring of Graphene Ensembles, in Electrochemistry Communications, 34, 189-191.
In-situ electrochemical dilatometry of onion-like carbon and carbon black
(2012), In-situ electrochemical dilatometry of onion-like carbon and carbon black, in Journal of the Electrochemical Society, 159(11), A1897-A1903.
Partially reduced graphite oxide as anode for Li-Capacitors
(2012), Partially reduced graphite oxide as anode for Li-Capacitors, in ECS Electrochemistry Letters, 1(1), A1-A3.
Partially reduced graphite oxide as electrode material for electrochemical double layer capacitors
(2012), Partially reduced graphite oxide as electrode material for electrochemical double layer capacitors, in Chemistry European Journal, Volume 18(Issue 29), 9125-9136.
Partially reduced graphite oxide as electrode material for electrochemical double layer capacitors
(2012), Partially reduced graphite oxide as electrode material for electrochemical double layer capacitors, in Chemistry European Journal, 18(29), 9125-9136.
In situ Electrochemical Dilatometry of Carbide-Derived Carbons
(2011), In situ Electrochemical Dilatometry of Carbide-Derived Carbons, in Electrochemistry Communication, 13, 1221-1224.
Partially reduced graphite oxide for supercapacitor electrodes: Effect of graphene layer spacing and huge specific capacitance
(2011), Partially reduced graphite oxide for supercapacitor electrodes: Effect of graphene layer spacing and huge specific capacitance, in ELECTROCHEMISTRY COMMUNICATIONS, 13(1), 90-92.
Investigation of diluted ionic liquid 1-ethyl-3-methyl imidazolium tetrafluoroborate electrolytes for intercalation-like electrodes used in supercapacitors
, 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.

Zusammenarbeit

Gruppe / Person Land
Formen der Zusammenarbeit
Drexel University, Philadelphia Vereinigte Staaten von Amerika (Nordamerika)
- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten
- Publikation
- Austausch von Mitarbeitern

Wissenschaftliche Veranstaltungen

Aktiver Beitrag

Titel Art des Beitrags Titel des Artikels oder Beitrages Datum Ort Beteiligte Personen
ICAC 2013, International Conference on Advanced Capacitors Vortrag im Rahmen einer Tagung Pillared graphene structures for supercapacitor electrodes produced by electrochemical activation of partially reduced graphite oxide 27.05.2013 Osaka, Japan, Japan Hantel Moritz;
63th Annual Meeting of ISE 2012 Vortrag im Rahmen einer Tagung Partially reduced graphite oxide, as electrode material for supercapacitors and Li-capacitors 19.08.2012 Prague, Czech Republic, Tschechische Republik Hantel Moritz;
CESEP 2011, 4th international conference on Carbons for Energy Storage/Conversion and Environment Protection Vortrag im Rahmen einer Tagung A comprehensive study on partially reduced graphite oxide for supercapacitor electrodes 25.09.2011 Vichy, France, Frankreich Hantel Moritz;
ISEE’Cap, 2nd International Symposium on Enhanced Electrochemical Capacitors Vortrag im Rahmen einer Tagung Partially reduced graphite oxide: A graphene like material for supercapacitor electrodes 12.06.2011 Poznan, Poland, Polen Hantel Moritz;


Auszeichnungen

Titel Jahr
Medal of the ETH Zurich for his excellent PhD thesis, Zürich, April 10, 2014 Title:Graphite oxide and graphene oxide based electrode materials for electrochemical double layer capacitors 2014
ISE Young Researcher Award for the Best Oral Presentation (Keynote) presented at the ISEE’Cap 2011 2011

Verbundene Projekte

Nummer Titel Start Förderungsinstrument
139173 Single Crystal Diffractometer with Cu/Mo Microsource 01.12.2011 R'EQUIP
59224 Scanning Probe Microscopy of the Solid Electrolyte Interphase (SEI) 01.04.2000 Projektförderung (Abt. I-III)
117607 Advanced materials for efficient portable energy supplies 01.10.2007 Projektförderung (Abt. I-III)
116568 Synthesis, structures and properties of solids 01.04.2007 Projektförderung (Abt. I-III)

Abstract

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).
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