Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 82, Issue -, Pages 309-316Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2019.10.028
Keywords
MXene; NiCo2S4; Binder-free; Electrostatic interactions; Asymmetric capacitor
Funding
- National Research Foundation under the Ministry of Science and ICT, Republic of Korea [2017M1A2A2087353, 2018R1A2B2006708]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [2018201010636A]
- China Scholarship Council (CSC) [201808260017]
- Korea Evaluation Institute of Industrial Technology (KEIT) [2018201010636A] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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MXene has been considered as a promising two-dimensional material for supercapacitors owing to its large surface area, high conductivity, and excellent cycling stability. However, its low specific capacitance restricts its extensive applications. Therefore, to address the issue, we homogeneously deposited NiCo2S4 nanoflakes on the surface of MXene on conductive nickel foam (denoted as MXene-NiCo2S4@NF), which was used as a composite binder-free electrode for supercapacitor applications. The NiCo2S4 nanoflakes increased the surface area of the composite electrode, thereby increasing its specific capacity from 106.34 C g(-1) to 596.69 C g(-1) at 1 A g(-1). Compared to the pristine MXene, MXene-NiCo2S4@NF maintained the high retention rate of pristine MXene and exhibited excellent cycling stability with 80.4% of its initial specific capacity after 3000 cycles. The composite electrode exhibited improved electrochemical performance for supercapacitors, owing to the combined merits of NiCo2S4 (high specific capacity) and MXene (high retention rate and good cycling stability. The fabricated asymmetric solid-state supercapacitor using MXene-NiCo2S4 as a positive electrode and active carbon as a negative electrode, exhibited an energy density of 27.24 Wh kg(-1) at 0.48 kW kg(-1) of power density. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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