Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 38, Pages 33203-33211Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b11574
Keywords
supercapacitor; conductive polymer; polypyrrole (PPy); electrochemical impedance spectroscopy (EIS); high cyclability
Funding
- Basic Science Program of the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2014-052607]
- Technology Innovation Program - Ministry of Trade, Industry & Energy of the Republic of Korea [10050481]
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We demonstrate a simple and efficient one-step procedure for synthesizing a solid state polypyrrole (PPy) thin film for supercapacitor applications using alternating current impedance spectroscopy. By controlling the frequency and amplitude we were able to create unique PPy nano/Microstructures with a particular morphology of the loop. Our PPy micro/nanosphere shows extremely high capacitance of 568 F/g, which is close to the theoretical value of 620 F/g and 20-100% higher than that of other, reported PPy electrodes. Most of all, this material presents high capacitance and significantly improved electrochemical stability without pulverization of its :structure, demonstrating 77% retention of the capacitance value even after 10 000 charge/discharge cycles. These results are a consequence of the larger surface area and adequate porosity generated due to the balance between the nano/micro PPy loops. This created porous structure also allows the favored penetration of electrolyte and high ion mobility within the polymer and prevents the mechanical failure of the physical-structure during volume variation associated with the insertion/deinsertion of ions upon cycling.
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