A graphene "MnO 2" hybrid supercapacitor based on in-situ electro-deposition and dissolution of "MnO 2"

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DOIResolve DOI: http://doi.org/10.1149/1.3654218
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TypeArticle
Proceedings titleECS Transactions
ConferenceNanostructured Materials for Energy Storage and Conversion - 219th ECS Meeting, 1 May 2011 through 6 May 2011, Montreal, QC
ISSN1938-5862
ISBN9781607682943
Volume35
Issue34
Pages195205; # of pages: 11
SubjectCharge/discharge cycle; Dissolution reactions; Electrochemical deposition; Energy density; Hybrid supercapacitors; Potential windows; Super-capacitor; Two-hybrid system; Capacitors; Dissolution; Electrodeposition; Energy storage; Graphene; Graphite electrodes; Hybrid systems; Nanostructured materials; Reduction; Manganese oxide
AbstractThe principle of feasibility of a hybrid super-capacitor, based on graphene and the electrochemical deposition and dissolution of "MnO 2", is demonstrated. For this system, a composite graphene electrode is used as the capacitive electrode. Graphene is also used in the battery type electrode, where it serves as substrate for the in-situ electrochemical deposition and dissolution of "MnO 2". The electrochemical deposition and dissolution reaction provides the bulk of the charge storable in the battery type electrode. The characteristics of the two electrodes are discussed showing that their respective potential windows of stabilities are compatible with the aqueous the electrolyte. Subsequently, two hybrid systems are assembled and subjected to long charge/discharge cycles. One assembly displays an energy density of 34 and 25 Wh.kg -1 after the first and 5000 th cycle, respectively. ©The Electrochemical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE)
Peer reviewedYes
NPARC number21271325
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Record identifiera08f5a72-dbc9-4cd7-befa-0ec7fb7a2b08
Record created2014-03-24
Record modified2016-05-09
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