CNT/High Mass Loading MnO 2 /Graphene-Grafted Carbon Cloth Electrodes for High-Energy Asymmetric Supercapacitors
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ARTICLE
Cite as Nano-Micro Lett. (2019) 11:88 Received: 13 August 2019 Accepted: 26 September 2019 © The Author(s) 2019
https://doi.org/10.1007/s40820-019-0316-7
CNT/High Mass Loading M nO2/Graphene‑Grafted Carbon Cloth Electrodes for High‑Energy Asymmetric Supercapacitors Lulu Lyu1, Kwang‑dong Seong1, Jong Min Kim1, Wang Zhang2, Xuanzhen Jin1, Dae Kyom Kim1, Youngmoo Jeon1, Jeongmin Kang1, Yuanzhe Piao1,3 * * Yuanzhe Piao, [email protected] Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea 2 School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, People’s Republic of China 1
3
Advanced Institutes of Convergence Technology, Suwon 443‑270, Republic of Korea
HIGHLIGHTS • CNT/MnO2/graphene-grafted carbon cloth electrode is designed and achieves high MnO2 mass loading (9.1 mg cm−2). • The electrode with favorable electronic/ionic conductivity delivers a large areal capacitance and rate capability. • The assembled asymmetric supercapacitor yields a large energy density of 10.18 mWh cm−3.
ABSTRACT Flexible supercapaci‑
e−
e−
tor electrodes with high mass load‑ ing are crucial for obtaining favorable
carbon cloth
challenging due to sluggish electron designed CNT/MnO2/graphene-grafted carbon cloth electrodes are prepared by
CNT/MnO2/GCC
e−
electrochemical performance but still and ion transport. Herein, rationally
e−
Graphene
MnO2
CNT
Electrolyte ions
High mass loading
V2O5/ECC 10.18 mWh cm−3
a “graft-deposit-coat” strategy. Due to the large surface area and good conductivity, graphene grafted on carbon cloth offers additional sur‑ face areas for the uniform deposition of MnO2 (9.1 mg cm−2) and facilitates charge transfer. Meanwhile, the nanostructured MnO2 provides
abundant electroactive sites and short ion transport distance, and CNT coated on M nO2 acts as interconnected conductive “highways” to
accelerate the electron transport, significantly improving redox reaction kinetics. Benefiting from high mass loading of electroactive mate‑ rials, favorable conductivity, and a porous structure, the electrode achieves large areal capacitances without compromising rate capability. The assembled asymmetric supercapacitor demonstrates a wide working voltage (2.2 V) and high energy density of 10.18 mWh cm−3.
KEYWORDS High mass loading; Flexible pseudocapacitor; Voltage window; Energy density
Vol.:(0123456789)
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88
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Nano-Micro Lett.
1 Introduction Flexible supercapacitors are one of the promising energy storage devices for wearable electronics due to their quick charging/discharging rate, high power density, and long cycle life [1]. However, it is challenging to store a large amount of energy in a confined device area, and further improvement would be necessary for practical applications. According to the equation of E = 0.5 CV2, the energy density (E) can be improved either by increasing the capacitance (C) or widening cell voltage (V). Hence, the combination of two electr
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