Highly stretchable and flexible supercapacitors based on electrospun PEDOT:SSEBS electrodes

Abstract

Stretchable and flexible supercapacitors with high energy and power densities are in demand for applications in wearable electronics. Here we report a highly stretchable and flexible supercapacitor based on electrospun...

Smart Energy Clays: Chemical Vapor Deposition of PEDOT in Expanded Vermiculite Blocks for Electrochemical Energy Storage

“…Figure c shows the specific capacitance of diverse contrast samples at different current densities, and it can be seen more directly that PEDOT/EVMT-180 has the best capacitance performance. At a current density of 3 mA cm –2 , the areal specific capacitance can reach 2592 mF cm –2 , which is higher than previous reports of SCs electrode based on conductive polymers (Figure g). − What is more, as the current density increases gradually, the capacitance remains stable with little attenuation, indicating excellent rate performance. The PEDOT/EVMT electrode showed a mass specific capacitance of 350 F g –1 at a current density of 2 A g –1 (Figure S3).…”

“…In the formulas, k 1 and k 2 are constants at a given potential, ν (V s –1 ) is scan rate, and i (A) is the current. ,,, Figure d shows the capacitance contribution ratios of PEDOT/EVMT-180 at different scan rates. It can be seen that the capacitance contribution rates gradually increase with the increment of scan rates, from 44.5% at 2 mV s –1 to 61.9% at 8 mV s –1 , demonstrating that the scan rate has a significant effect on the capacitance behavior and plays a major part in the total storage capacity, especially at high scan rate. ,− The excellent capacitive performance of PEDOT/EVMT-180 can be attributed to the mechanism illustrated in Figure e, with the microstructure of vermiculite depicted on the left. Vermiculite possesses a typical 2:1 layered silicoaluminate structure comprising two layers of silico-oxygen tetrahedra and one layer of magnesium–oxygen octahedra.…”

“…Parallel R1 and CPE1, parallel R2 and CPE2 correspond to two arcs in the high frequency region of the Nyquist plot. CPE represents resistance of double-layer capacitance. ,− The line in the low frequency region corresponds to the Warburg impedance. The values of all equivalent circuit parameters obtained through Z-view fitting software are listed in detail in Table S2.…”

“…(f) Nyquist plot of PEDOT/EVMT-180; the inset shows the equivalent circuit. (g) Comparison of the electrochemical performances of the PEDOT/EVMT-180 electrode with other conducting polymer electrodes. − …”

Donor–acceptor-based two-dimensional polymer as a supercapacitor electrode with long cycling stability

“…The R s value before cycling was significantly low (2.3 Ω), indicating the existence of a favourable electrode–electrolyte interface. 48 Similarly, a very low charge-transfer resistance value (0.60 Ω) was obtained, which would result in faster charge transfer at the electrode–electrolyte interface. After 10 000 electrochemical cycles, R s slightly increased to 3.7 Ω and similarly, R ct to 0.78 Ω.…”