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High energy density and enhanced rate capability are highly sought-after for supercapacitors in today's mobile world. In this work, polyaniline/titanium carbide (MXene) (PANI/Ti3C2Tx) nanohybrid is synthesized through a facile and cost-effective self-assembly of one-dimensional (1D) PANI nanofibers and two-dimensional (2D) Ti3C2Tx nanosheets. PANI/Ti3C2Tx delivers greatly improved specific capacitance, ultrahigh rate capability (67% capacitance retention from 1 to 100 A·g−1) as well as good cycle stability. Electrochemical kinetic analysis reveals that PANI/Ti3C2Tx is featured with surface capacitance-dominated process and has a quasi-reversible kinetics at high scan rates, giving rise to an ultrahigh rate capability. By using PANI/Ti3C2Tx as positive electrode, an 1.8 V aqueous asymmetric supercapacitor (ASC) is successfully assembled, showing a maximum energy density of 50.8 Wh·kg−1 (at 0.9 kW·kg−1) and a power density of 18 kW·kg−1 (at 26 Wh·kg−1). Moreover, an 3.0 V organic ASC is also elaborately fabricated by using PANI/Ti3C2Tx, achieving an ultrahigh energy density of 67.2 Wh·kg−1 (at 1.5 kW·kg−1) and a power density of 30 kW·kg−1 (at 26.8 Wh·kg−1). The present work not only improves fundamental understanding of the structure-property relationship towards ultrahigh rate capability electrode materials, but also provides valuable guideline for the rational design of high-performance energy storage devices with both high energy and power densities.


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Ultrahigh rate capability of 1D/2D polyaniline/titanium carbide (MXene) nanohybrid for advanced asymmetric supercapacitors
Show Author's information Jinhua Zhou1Qi Kang2Shuchi Xu1Xiaoge Li1Cong Liu1Lu Ni1Ningna Chen1Chunliang Lu3Xizhang Wang1Luming Peng1Xuefeng Guo1Weiping Ding1Wenhua Hou1( )
Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210023 China
Department of Polymer Science and Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging Shanghai Jiao Tong UniversityShanghai 200240 China
Analytical Testing Center Yangzhou UniversityYangzhou 225009 China
Abstract

High energy density and enhanced rate capability are highly sought-after for supercapacitors in today's mobile world. In this work, polyaniline/titanium carbide (MXene) (PANI/Ti3C2Tx) nanohybrid is synthesized through a facile and cost-effective self-assembly of one-dimensional (1D) PANI nanofibers and two-dimensional (2D) Ti3C2Tx nanosheets. PANI/Ti3C2Tx delivers greatly improved specific capacitance, ultrahigh rate capability (67% capacitance retention from 1 to 100 A·g−1) as well as good cycle stability. Electrochemical kinetic analysis reveals that PANI/Ti3C2Tx is featured with surface capacitance-dominated process and has a quasi-reversible kinetics at high scan rates, giving rise to an ultrahigh rate capability. By using PANI/Ti3C2Tx as positive electrode, an 1.8 V aqueous asymmetric supercapacitor (ASC) is successfully assembled, showing a maximum energy density of 50.8 Wh·kg−1 (at 0.9 kW·kg−1) and a power density of 18 kW·kg−1 (at 26 Wh·kg−1). Moreover, an 3.0 V organic ASC is also elaborately fabricated by using PANI/Ti3C2Tx, achieving an ultrahigh energy density of 67.2 Wh·kg−1 (at 1.5 kW·kg−1) and a power density of 30 kW·kg−1 (at 26.8 Wh·kg−1). The present work not only improves fundamental understanding of the structure-property relationship towards ultrahigh rate capability electrode materials, but also provides valuable guideline for the rational design of high-performance energy storage devices with both high energy and power densities.

Keywords: MXene, polyaniline, nanohybrid, asymmetric supercapacitor, rate capability
Received: 28 January 2021 Revised: 22 March 2021 Accepted: 25 March 2021 Published: 24 April 2021 Issue date: January 2022
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Received: 28 January 2021
Revised: 22 March 2021
Accepted: 25 March 2021
Published: 24 April 2021
Issue date: January 2022

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© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021

Acknowledgements

Acknowledgements

The authors appreciate the financial support of the National Natural Science Foundation of China (No. 21773116), the Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP, 20130091110010), the Natural Science Foundation of Jiangsu Province (No. BK2011438), the National Science Fund for Talent Training in Basic Science (No. J1103310) and the Modern Analysis Center of Nanjing University and the Program B for Outstanding PhD Candidate of Nanjing University.

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