期刊
ACS NANO
卷 13, 期 6, 页码 6899-6905出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b01762
关键词
two-dimensional material; MXene; redox-active electrolyte; hybrid supercapacitor; energy storage
类别
资金
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences (CAS)
- Youth Innovation Promotion Association, CAS [2011152]
- National Natural Science Foundation of China [51572259, 51872283]
- National Key R&D Program of China [2016YBF0100100, 2016YFA0200200]
- Natural Science Foundation of Liaoning Province [20180510038]
- DICP [DICP ZZBS201708]
- Dalian National Laboratory For Clean Energy (DNL), CAS
- DICPQIBEBT [DICPQIBEBT UN201702]
- DNL Cooperation Fund, CAS [DNL180310, DNL180308]
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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