Journal
ELECTROCHIMICA ACTA
Volume 263, Issue -, Pages 447-453Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.01.071
Keywords
Polypyrrole; Petroleum pitch; Electrochemical performance; Supercapacitor
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Funding
- Technology Innovation Program - ministry of Trade, Industry and Energy (MOTIE, Korea)
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT and future Planning [NRF-2016H1D5A1909732]
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Pitch-based activated carbon/tubular polypyrrole (ACPPy) composites with various tubular polypyrrole (T-PPy) contents are prepared as active electrode materials for supercapacitors. Examination of the morphology of the ACPPy composites by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) shows that T-PPy is deposited onto the surface of pitch-based activated carbons (ACs). As evidenced by cyclic voltammetry and galvanostatic charge/discharge tests, the addition of T-PPy to ACs s significantly improves the specific capacitance of the carbon electrode and consequently, the electrochemical performances of ACPPy composites for supercapacitors. The composite material has a high specific capacitance of 82.3 F g(-1), whereas the capacitance of the ACs electrode is only 43.13 F g(-1). Although supercapacitors using the ACPPy composite as an active electrode material exhibit an initial loss of capacitance owing to the instability of PPy, the specific capacitance after 1000 cycles stabilizes at a similar value. (c) 2018 Published by Elsevier Ltd.
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