期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 824, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.153929
关键词
Self-supported; Manganese dioxide; Nickel cobalt layered double hydroxide; Flexible electrode
资金
- Natural Science Foundation of Chongqing [cstc2019jcyj-msxmX0566, cstc2018jcyjAX0450, cstc 2018jcyjA2923, cstc2017jcyjAX0393]
- Projects of President Foundation of Chongqing University [2019CDXZWL002]
- Fundamental Research Funds for the Central Universities [2019CDXYWL0029, 2018CDJDWL0011, 106112017CDJQJ328839, 106112016CDJZR288 805]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJKJQN201800102, KJQN201 800619, KJ1703042]
- NSFC [11544010, 11374359, 11304405, 1155305, 51877023]
- Sharing Fund of Large-scale Equipment of Chongqing University [201903150094]
Nickel cobalt layered double hydroxides (NiCo-LDHs) nanosheets (NSs) were synthesized on a flexible carbon cloth (CC) substrate by a simple hydrothermal method. Then the manganese dioxide (MnO2) NSs were directly deposited on the NiCo-LDH/CC to form three-dimensional (3D) self-supported core-shell MnO2/NiCo-LDH/CC flexible electrodes. The MnO(2 )NSs with three different loading amount on NiCoLDH/CC substrate, named MnO2-1/NiCo-LDH/CC, MnO2-2/NiCo-LDH/CC and MnO2-3/NiCo-LDH/CC, were hydrothermally synthesized in 0.01 M, 0.02 M and 0.03 M potassium permanganate (KMnO4) solution, respectively. The morphology and electrochemical performance of these obtained composite electrodes were observed and analyzed. The MnO2 -2/NiCo-LDH/CC electrode exhibits a capacitive performance of 312 F g(-1) at 0.2 A g(-1) (937 mF cm(-2) at 1 mV s(-1)) and maintains 97% of the original capacitance after 5000 charge-discharge cycles. The good mechanical stability and excellent cycle performance of MnO2-2/NiCo-LDH/CC electrode is benefit from the numerous channels for rapid electron transport provided by the large specific surface area and self-supported of NiCo-LDH nanoflakes. Therefore, the MnO2-2/NiCo-LDH/CC composite electrode is a potential candidate in wearable energy storage device. (C) 2020 Elsevier B.V. All rights reserved.
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