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UID:DSC-14456
DTSTART;TZID=Europe/Berlin:20180507T130000
SEQUENCE:1525679814
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URL:https://dresden-science-calendar.de/calendar/de/detail/14456
LOCATION:IFW\, Helmholtzstraße 2001069 Dresden
SUMMARY:Li: Rolled-up micro asymmetric supercapacitors
CLASS:PUBLIC
DESCRIPTION:Speaker: Fei Li\nInstitute of Speaker: IFW Dresden\nTopics:\nMa
 terialien\, Physik\n Location:\n  Name: IFW (B3E.26\, Leibniz IFW Dresden)
 \n  Street: Helmholtzstraße 20\n  City: 01069 Dresden\n  Phone: \n  Fax: 
 \nDescription: The push towards miniaturized electronics calls for the dev
 elopment of micro-scale energy-storage components that can enable sustaina
 ble and autonomous operation of electronic devices for applications[1\,2].
  Micro-supercapacitors have been targeted as a viable route\, because they
  can be charged and discharged much more rapidly and have an almost unlimi
 ted lifetime[3]. However\, due to their low potential window\, micro-super
 capacitors store less energy than microbatteries and it is still challengi
 ng to realize the above purpose. Considering a win–win situation to reac
 h a common goal of higher energy density and power density\, one design of
  “Micro asymmetric supercapacitors (MASCs)” has been proposed recently
 . MASCs consist of two dissimilar electrodes\, being able to achieve highe
 r working voltage[4\,5]. Unfortunately\, the development of such kind of d
 evice is prevented by the required complex processing of patterned active 
 materials and low areal performance in practical microelectronic circuits[
 6]. Therefore\, it is of vital importance to develop a smart and reliable 
 fabrication method for constructing 3D MASCs with high areal performance a
 nd advanced integrability with microelectronics. Rolled-up nanotechnology\
 , a unique method to self-assemble nanomembranes into 3D structures\, has 
 already been developed for the tubular battery materials and capacitor dev
 ices[7\,8]. It opens up the possibility towards the integrated rolled-up M
 ASCs with small footprint area.  In this talk\, I will demonstrate my rout
 e towards integrated rolled-up MASCs with a new material system. PEDOT-MnO
 2 and Fe2O3 are deposited on interdigital current collectors\, acting as c
 athode and anode\, respectively. Strained polymeric layer was utilized to 
 roll the planar MASCs device into the tubular structure within greatly red
 uced footprint area. The electrochemical performance of each electrode mat
 erial was optimized in three-electrode system\, and then the areal perform
 ance of rolled-up MASCs was investigated. The rolled-up MASCs show areal c
 apacitances up to 55 mF cm-2 at a current density of 0.68 mA cm-2. Further
  exploration and optimization are expected to provide integrated rolled-up
  MASCs with ultrahigh areal performance.   References [1] C. Zhong et al. 
 Chem. Soc. Rev.\, 2015\, 44\, 7484-7539. [2] N. A. Kyeremateng et al. Natu
 re Nanotech. \, 2017\, 12\, 7-15. [3] K. Wang et al.Adv. Energy Mater. \, 
 2011\, 1\, 1068–1072. [4] N. Choudhary et al. Adv. Mater. \, 2017\, 1605
 336. [5] M.F. El-Kady et al. Nat. Commun.\, 2013\, 4\, 1475.  [6] H. Pang 
 et al. Nano Energy\, 2015\, 15\, 303–312 [7] J. Deng\, X. Lu\, L. Liu\, 
 L. Zhang and O. G. Schmidt\, Adv. Energy Mater.\, 2016\, 6\, 1600797. [8] 
 X. Wang\, Y. Chen\, O. G. Schmidt and C. Yan\, Chem. Soc. Rev. \, 2016\,45
 \, 1308.
DTSTAMP:20260601T034511Z
CREATED:20180504T074331Z
LAST-MODIFIED:20180507T075654Z
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