Journal
ACS OMEGA
Volume 5, Issue 35, Pages 22119-22130Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c02151
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Funding
- National Natural Science Foundation of China [51904349]
- Zhengzhou Nonferrous Metals Research Institute Co. Ltd of CHALCO [ZY2013CDDB01]
- 1125 Talents Recruitment Program in Zhengzhou
- Zhengzhou municipal people's government
- CHALCO
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Nanoscale polyaniline (PANI) is formed on a hierarchical 3D microstructure carbon nanotubes (CNTs)/carbon fiber paper (CFP) substrate via a one-step electrochemical polymerization method. The chemical and structural properties of the binder-free PANI/CNTs/CFP electrode are characterized by field emission scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and Raman spectroscopy. The specific capacitance of PANI/CNTs/CFP tested in a symmetric two-electrode system reaches 731.6 mF.cm(-2) (1354.7 F.g(-1)) at a current density of 1 mA.cm(-2) (1.8 A.g(-1)). The symmetric supercapacitor device demonstrates excellent cycling performance up to 10,000 cycles with a capacitance retention of 81.4% at a current density of 1 mA.cm(-2) (1.8 A.g(-1)). The results demonstrate that the binder-free CNTs/CFP composite is a strong backbone for depositing ultrathin PANI layers at a high mass loading. The hierarchical 3D microstructure PANI/CNTs/CFP provides enough space and transporting channels to form an efficient electrode-electrolyte interface for the supercapacitance reaction. The formed nanoscale PANI film coaxially coated on the sidewalls of CNTs enables efficient charge transfer and a shortened diffusion length. Hence, the utilization efficiency and electrochemical performances of PANI are significantly improved. The rational design strategy of a CNT-based binder-free hierarchical 3D microstructure can be used in preparing various advanced energy-storage electrodes for electrochemical energy-storage and conversion systems.
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