Three-dimensionally assembled Graphene/alpha-MnO2 nanowire hybrid hydrogels for high performance supercapacitors
- Authors
- Tuan Sang Tran; Tripathi, Kumud Malika; Kim, Bit Na; You, In-Kyu; Park, Byung Jun; Han, Young Hee; Kim, TaeYoung
- Issue Date
- Dec-2017
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Graphene; alpha-MnO2 nanowires; Composites; Supercapacitors; Energy storage
- Citation
- MATERIALS RESEARCH BULLETIN, v.96, pp.395 - 404
- Journal Title
- MATERIALS RESEARCH BULLETIN
- Volume
- 96
- Start Page
- 395
- End Page
- 404
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/5391
- DOI
- 10.1016/j.materresbull.2017.04.012
- ISSN
- 0025-5408
- Abstract
- We present a facile hydrothermal method to produce graphene-metal oxide composite that offer synergistic effect of three-dimensional (3D) graphene and electroactive alpha-MnO2 nanowires to improve high energy storage capability in supercapacitors. The graphene/alpha-MnO2 nanowire hydrogel is prepared via a simple hydrothermal route, in which graphene and alpha-MnO2 nanowires are self-assembled into 3D macroporous network structures. An asymmetric supercapacitor device is fabricated by using graphene/alpha-MnO2 nanowire hydrogel as positive electrode and 3D graphene hydrogel as negative electrode in an aqueous Na2SO4 electrolyte. The asymmetric cell can be cycled in the wide voltage range of 0-2 V and exhibit a gravimetric energy density of 38 Wh kg(-1) with a maximum power density of 258 kW kg(-1). In addition, it shows a good cycle stability with similar to 94% capacitance retention after 1000 cycles. The graphene/alpha-MnO2 nanowires hybrid hydrogels may have great potential in developing energy storage devices with high energy and power densities. (C) 2017 Elsevier Ltd. All rights reserved.
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Collections - 공과대학 > 신소재공학과 > 1. Journal Articles
- 산업·환경대학원 > 산업환경공학과 > 1. Journal Articles
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