High-Energy-Density Hydrogen-Ion-Rocking-Chair Hybrid Supercapacitors Based on Ti3C2Tx MXene and Carbon Nanotubes Mediated by Redox Active Molecule
- Minmin HuMinmin HuShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, ChinaMore by Minmin Hu
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- Cong CuiCong CuiShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, ChinaMore by Cong Cui
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- Chao ShiChao ShiShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaMore by Chao Shi
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- Zhong-Shuai Wu*Zhong-Shuai Wu*E-mail: [email protected]Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, ChinaMore by Zhong-Shuai Wu
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- Jinxing YangJinxing YangShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, ChinaMore by Jinxing Yang
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- Renfei ChengRenfei ChengShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, ChinaMore by Renfei Cheng
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- Tianjia GuangTianjia GuangShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaSchool of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, ChinaMore by Tianjia Guang
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- Hailong WangHailong WangSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, ChinaMore by Hailong Wang
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- Hongxia LuHongxia LuSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, ChinaMore by Hongxia Lu
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- Xiaohui Wang*Xiaohui Wang*E-mail: [email protected]Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaMore by Xiaohui Wang
Abstract

MXenes have emerged as promising high-volumetric-capacitance supercapacitor electrode materials, whereas their voltage windows are not wide. This disadvantage prevents MXenes from being made into aqueous symmetric supercapacitors with high energy density. To attain high energy density, constructing asymmetric supercapacitors is a reliable design choice. Here, we propose a strategy to achieve high energy density of hydrogen ion aqueous-based hybrid supercapacitors by integrating a negative electrode of Ti3C2Tx MXene and a positive electrode of redox-active hydroquinone (HQ)/carbon nanotubes. The two electrodes are separated by a Nafion film that is proton permeable in H2SO4 electrolyte. Upon charging/discharging, hydrogen ions shuttle back and forth between the cathode and anode for charge compensation. The proton-induced high capacitance of MXene and HQ, along with complementary working voltage windows, simultaneously enhance the electrochemical performance of the device. Specifically, the hybrid supercapacitors operate in a 1.6 V voltage window and deliver a high energy density of 62 Wh kg–1, which substantially exceeds those of the state-of-the-art aqueous asymmetric supercapacitors reported so far. Additionally, the device exhibits excellent cycling stability and the all-solid-state planar hybrid supercapacitor displays exceptional flexibility and integration for bipolar cells to boost the capacitance and voltage output. These encouraging results provide the possibility of designing high-energy-density noble-metal-free asymmetric supercapacitors for practical applications.
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