Design and fabrication of polypyrrole/expanded graphite 3D interlayer nanohybrids towards high capacitive performance

Abstract

Polypyrrole/expanded graphite nanohybrids with a hierarchical structure were synthesized as electrode materials, and showed outstanding energy storage performance.

Fabrication of N,B‐codoped Graphene Aerogel/PPy Composites for Asymmetric Supercapacitor

“…Based on these GCD curves, the slightly asymmetrical shape of PPy‐TB electrodes could be due to pseudocapacitive behavior. Furthermore, the twisty triangle shape of NBGA@PPy‐TB is also characterized by obvious pseudo‐capacitance [16] . The specific capacitances of the NBGA, PPy‐TB, and NBGA@PPy‐TB electrodes at 1 A/g current density were 126.4, 209, and 566 F/g, respectively.…”

“…The obtained materials were characterized by the Fourier transform infrared (FTIR) spectroscopy, as seen in Figure 3d. In the infrared spectrum of the PPy‐TB sample, the peak at 1550 cm −1 and 1471 cm −1 corresponds to a peak of 1552 cm −1 and 1477 cm −1 for reported PPy, which are C=C bond telescopic vibration and the C−N bond asymmetric telescopic vibration absorption of pyrrole rings [16] . The peaks at 1051 cm −1 and 924 cm −1 correspond to a peak of 1045 cm −1 and 925 cm −1 for reported pure PPy, ascribing for in‐plane deformation of the C−H bond and C−C out of plane vibration [12,26] .…”

“…In the infrared spectrum of the PPy-TB sample, the peak at 1550 cm À 1 and 1471 cm À 1 corresponds to a peak of 1552 cm À 1 and 1477 cm À 1 for reported PPy, which are C=C bond telescopic vibration and the CÀ N bond asymmetric telescopic vibration absorption of pyrrole rings. [16] The peaks at 1051 cm À 1 and 924 cm À 1 correspond to a peak of 1045 cm À 1 and 925 cm À 1 for reported pure PPy, ascribing for in-plane deformation of the CÀ H bond and CÀ C out of plane vibration. [12,26] Compared with the reported pure PPy, the characteristic peaks of PPy-TB have a slight shift.…”

“…The rational combination of PPy with carbon materials is an efficient strategy to prepare flexible hybrid electrodes [14,15] . GA is reported to be used as hosts of PPy for electrode material to boost performance [16,17] . In these electrodes, PPy can serve as the interconnected network to increase the overall electrical conductivity as well as improve the electron transfer between PPy and carbon‐based materials.…”

“…[14,15] GA is reported to be used as hosts of PPy for electrode material to boost performance. [16,17] In these electrodes, PPy can serve as the interconnected network to increase the overall electrical conductivity as well as improve the electron transfer between PPy and carbon-based materials. The capacitance performance of the hybrid is improved due to the contribution from both faradaic and non-faradaic processes.…”