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Vol. 11 (2019)

CNT/High Mass Loading MnO2/Graphene-Grafted Carbon Cloth Electrodes for High-Energy Asymmetric Supercapacitors

https://doi.org/10.1007/s40820-019-0316-7
Lulu Lyu
Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea
Kwang‑dong Seong
Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea
Jong Min Kim
Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea
Wang Zhang
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, People’s Republic of China
Xuanzhen Jin
Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea
Dae Kyom Kim
Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea
Youngmoo Jeon
Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea
Jeongmin Kang
Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea
Yuanzhe Piao
Graduate School of Convergence Science and Technology, Seoul National University, Seoul 151‑742, Republic of Korea

Corresponding Author: Yuanzhe Piao

parkat9@snu.ac.kr

Nano-Micro Letters, Vol. 11 (2019), Article Number: 88

Abstract

Flexible supercapacitor electrodes with high mass loading are crucial for obtaining favorable electrochemical performance but still challenging due to sluggish electron and ion transport. Herein, rationally designed CNT/MnO2/graphene-grafted carbon cloth electrodes are prepared by a “graft-deposit-coat” strategy. Due to the large surface area and good conductivity, graphene grafted on carbon cloth offers additional surface 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 MnO2 acts as interconnected conductive “highways” to accelerate the electron transport, significantly improving redox reaction kinetics. Benefiting from high mass loading of electroactive materials, 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.


Highlights:


1 CNT/MnO2/graphene-grafted carbon cloth electrode is designed and achieves high MnO2 mass loading (9.1 mg cm−2).
2 The electrode with favorable electronic/ionic conductivity delivers a large areal capacitance and rate capability.
3 The assembled asymmetric supercapacitor yields a large energy density of 10.18 mWh cm−3.

Keywords

High mass loading Flexible pseudocapacitor Voltage window Energy density
Lyu, Lulu, Kwang‑dong Seong, Jong Min Kim, Wang Zhang, Xuanzhen Jin, Dae Kyom Kim, Youngmoo Jeon, Jeongmin Kang, and Yuanzhe Piao. 2019. “CNT/High Mass Loading MnO2/Graphene-Grafted Carbon Cloth Electrodes for High-Energy Asymmetric Supercapacitors”. Nano-Micro Letters 11 (October):88. https://doi.org/10.1007/s40820-019-0316-7.
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