Carbonized thiourea formaldehyde resin blending polypyrrole hollow spheres composites with improved supercapacitor performances as electrodes

Abstract

Thiourea formaldehyde resin has been condensation‐polymerized in the polypyrrole hollow spheres suspension to obtain TF/PPy. Then, TF/PPy has been carbonized at 750 °C to acquire CTF/PPy composites. Scanning electron microscope and transmission electron microscope images were used to observe the morphology of the samples, TGA, XRD, Raman, XPS, and BET were used to analyze the structure of the materials. The results show PPy was blended with the TF resin, and the obtained CTF/PPy exhibited improved supercapacitive performances compared with CTF. The specific capacitance of CTF/PPy is 226.8 F g−1 at the current density of 1 A g−1 according to GCD curves, much higher than that of CTF. More interestingly, the cycling retention of CTF/PPy electrode at the current density of 10 A g−1 is up to 120.2% after 10 000 cycles. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47816.

Incorporating Ni-MOF structure with polypyrrole: enhanced capacitive behavior as electrode material for supercapacitor

“…In the low frequency region, almost vertical line represents the ion diffusion ability of the PPy-MOF electrode, showing an ideal capacitive behavior. 43,44 The low ESR of the electrode materials and fast ion diffusion at the interface between the electrode and electrolyte are benecial to the rate performance of the ASC. 44 Additionally, the assembled ASC exhibits an excellent electrochemical cycling stability with 80% capacitance reservation over 10 000 cycles (Fig.…”

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

“…The of NBGA, PPy‐TB, and NBGA@PPy‐TB electrodes were about 127.6 %, 96.3 % and 103.3 % at current densities of 1 A/g, revealing the hybrid of NBGA improved the capacitance property of PPy‐TB [25] . Figure 4b is the GCD results of NBGA@PPy‐TB at different current densities.…”

“…The observed intensity ratio (I D /I G ) from the PPy‐TB (0.9) and NBGA@PPy‐TB (0.8) is decreased due to a high graphitized degree. It means that the addition of PPy‐TB benefits the graphitized degree of NBGA@PPy‐TB [25] . The G+D combination band at about 2900 cm −1 is observed in the presence of defects [23] …”

“…The diameter of the semicircle yields the charge transfer resistance (R ct ), relating with the faradaic reactions [29] . The smaller the radius of the semicircles, the lower the impedance is, which implies better conductivity of the NBGA@PPy‐TB electrode [25] . Moreover, the line in the low‐frequency region of NBGA@PPy‐TB is closer to the vertical axis, indicating that the material has a more typical capacitance characteristic.…”

“…It means that the addition of PPy-TB benefits the graphitized degree of NBGA@PPy-TB. [25] The G + D combination band at about 2900 cm À 1 is observed in the presence of defects. [23] Figure 1.…”