Journal
CHEMISTRYSELECT
Volume 4, Issue 7, Pages 2009-2017Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201900140
Keywords
Self-Supporting Electrode; Conducting Polymer; Synergistic Effect; Coaxial Nanocable
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Funding
- Material Genome Initiative Project Foundation of Science and Technology Commission of Shanghai Municipality [16DZ2260602]
- National Natural Science Foundation of China [51772190]
- Advanced Energy Material and Technology Center of Shanghai Jiao Tong University
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A free-standing film of manganese oxide/poly(3,4-ethylenedioxythiophene):poly (styrene sulfonate)/ carbon nanotubes (MnO2/PEDOT:PSS/CNTs) is obtained and directly applied as self-supporting electrode of supercapacitors. CNTs (modified by ionic liquid) are homogeneously wrapped by conducting polymer PEDOT:PSS. The presence of PEDOT:PSS prevents ultrathin MnO2 nanosheets from restacking as well as promotes them vertical growth and uniform distribution on the surface of PEDOT:PSS/CNTs. The MnO2/PEDOT:PSS/CNTs hybrid electrode which possesses coaxial nanocable structure exhibits significant improvement both in specific capacitance and conductivity compared with CNTs or MnO2/CNTs electrodes. This specific hybrid structure greatly accelerates electrons transport. The specific capacitance of MnO2/PEDOT:PSS/CNTs electrode is 533 Fcm(-3) at the current density of 1 mAcm(-2), while the specific capacitance values of CNTs and MnO2/CNTs electrodes at the same current density only show 15 and 150 Fcm(-3), respectively. The as-fabricated MnO2/PEDOT:PSS/CNTs hybrid film also exhibits excellent rate capability and cycle stability. For example, the hybrid film shows a specific capacitance of 265 Fcm(-3) at current density of 20 mAcm(-2), and the high capacitance retention ratio of 129% is achieved after 20000 cycles. Due to its excellent electrochemical properties and good flexibility, MnO2/PEDOT:PSS/CNTs self-supporting electrode presents promising applications in flexible supercapacitors.
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