BROWSE

Related Scientist

Researcher

나노 구조 물리 연구단
나노구조물리 연구단
more info

Asymmetric Supercapacitors Based on Graphene/MnO2 Nanospheres and Graphene/MoO3 Nanosheets with High Energy Density Highly Cited Paper

Cited 302 time in webofscience Cited 0 time in scopus
766 Viewed 63 Downloaded
Title
Asymmetric Supercapacitors Based on Graphene/MnO2 Nanospheres and Graphene/MoO3 Nanosheets with High Energy Density
Author(s)
Jian Chang; Meihua Jin; Fei Yao; Tae Hyung Kim; Viet Thong Le; Hongyan Yue; Fethullah Gunes; Bing Li; Arunabha Ghosh; Sishen Xie; Young Hee Lee
Publication Date
2013-10
Journal
ADVANCED FUNCTIONAL MATERIALS, v.23, no.40, pp.5074 - 5083
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Asymmetric supercapacitors with high energy density are fabricated using a self-assembled reduced graphene oxide (RGO)/MnO2 (GrMnO2) composite as a positive electrode and a RGO/MoO3 (GrMoO3) composite as a negative electrode in safe aqueous Na2SO4 electrolyte. The operation voltage is maximized by choosing two metal oxides with the largest work function difference. Because of the synergistic effects of highly conductive graphene and highly pseudocapacitive metal oxides, the hybrid nanostructure electrodes exhibit better charge transport and cycling stability. The operation voltage is expanded to 2.0 V in spite of the use of aqueous electrolyte, revealing a high energy density of 42.6 Wh kg-1 at a power density of 276 W kg-1 and a maximum specific capacitance of 307 F g-1, consequently giving rise to an excellent Ragone plot. In addition, the GrMnO2//GrMoO3 supercapacitor exhibits improved capacitance with cycling up to 1000 cycles, which is explained by the development of micropore structures during the repetition of ion transfer. This strategy for the choice of metal oxides provides a promising route for next-generation supercapacitors with high energy and high power densities. Asymmetric supercapacitors with high energy density are fabricated using self-assembled graphene/MnO2 as a positive electrode and graphene/MoO3 (GrMoO3) as a negative electrode in aqueous electrolyte. Choosing metal oxides with a large work function difference, the operating voltage is expanded to 2.0 V in spite of the use of the aqueous electrolyte, with a high energy density of 42.6 Wh kg-1 at a power density of 276 W kg-1 and a maximum capacitance of 307 F g -1. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
URI
https://pr.ibs.re.kr/handle/8788114/1237
ISSN
1616-301X
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Files in This Item:
316.adfm 201301851-Manuscript-Black.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse