Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 43, Pages 29452-29460Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b09779
Keywords
PANi; conducting polymers; energy storage; pseudocapacitance; doping EDLC; supercapacitors; poly(lactic acid)
Funding
- U.S. Department of Education [P200A150105]
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Electrochemical capacitors fabricated with polyaniline nanofibers are cycled 150 000 times with 98% capacitance retention. These devices maintain an energy density of 11.41 Wh/kg at a power density of 4000 W/kg, 64 times greater than that of an identically fabricated device based on activated carbon (0.177 Wh/kg at 4600 W/kg). For applications requiring a higher specific energy, 33.39 Wh/kg at a specific power of 600 W/kg is obtained by widening the voltage window; this device retains 93% capacitance after 10 000 cycles. We achieve a high cycling stability through careful device engineering paired with a renewed focus on the electrochemical processes occurring at the positive and negative electrodes during cycling.
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