Journal
CHEMICAL ENGINEERING JOURNAL
Volume 334, Issue -, Pages 184-190Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.10.038
Keywords
All-solid-state; Supercapacitor; Freestanding; Binder-free; Core-double-shell; Carbon nanofibers@polypyrrole@graphene
Categories
Funding
- Distinguished Professorship of 1000 Talents Program [31270086963030]
- Taishan Scholar Program [11370085961006]
- Shandong Provincial Science and Technology Major Project [2015ZDZX11008, 2015GGE27286, 2016GGX104001]
- Fundamental Research Funds of Shandong University at Shandong University [2016JC005]
- Welch Foundation from United States [C-1716]
- Distinguished Taishan Scholars Program [201511029]
- Fundamental Research Funds of Shandong University [2015JC033]
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A freestanding, binder-free carbon nanofibers@polypyrrole@reduced graphene oxide (CNFs@PPy@rGO) core-double-shell supercapacitor electrode is prepared by carbonization of electrospun PAN nanofibers network follow by the electrochemical deposition of PPy and then reduced graphene oxide layer coating. The flexible all-solid-state supercapacitor based on the CNFs@PPy@rGO core-double-shell electrode with PVA/H3PO4 gel electrolyte demonstrates a highest specific capacitance of 188 F/g at the scan rate of 2 mV/s and good cycling stability. Due to the synergistic effect of three materials, the newly designed composite electrode shows the highest specific capacitance of 336.2 F/g at the scan rate of 2 mV/s, which increases by 10% than that of CNFs@PPy electrode (302.7 F/g) at the same scan rate in a three-electrode system. Furthermore, it shows excellent cycling stability performance with 98% capacitance retention after 2500 cycles, which is better than that of CNFs@PPy electrode (90%).
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