Homogeneous coating of carbon nanotubes with tailored N-doped carbon layers for improved electrochemical energy storage

Abstract

Polyimide-derived N-doped carbon layers were coated onto carbon nanotubes for high-rate electrodes with enhanced energy storage.

Bifunctional Sulfhydryl-Based Polyimides for Highly Active Cathodes of Li–S Batteries

“…In order to prove the successful synthesis of thiolactone monomers, FT-IR spectroscopy was used to analyze the structures of BPDA-T, ODPA-T, and BTDA-T. As shown in Figure a–c, the two symmetric strong absorption peaks of BPDA, ODPA, and BTDA near 1850 and 1780 cm –1 were assigned to the CO structure in the anhydride, while the absorption peaks of BPDA-T, OPDA-T, and BTDA-T disappeared at this position. Meanwhile, the absorption peak observed at 1370 cm –1 can be attributed to the stretching of the C–N–C ring, indicating the presence of an imide ring structure in BPDA-T, OPDA-T, and BTDA-T. The absorption peak at 1710 cm –1 in BPDA-T, ODPA-T, and BTDA-T was caused by the cyclic thioester .…”

A Low‐Temperature Dehydration Carbon‐Fixation Strategy for Lignocellulose‐Based Hierarchical Porous Carbon for Supercapacitors

“…The RHPC and RHPC‐N10 electrodes have no obvious arc in the high‐frequency region (inset in Figure 6h), indicating small charge transfer resistances and good wettability in the Et 4 NBF 4 /propylene carbonate (PC) electrolyte. The intercept of Nyquist curve on the horizontal axis is the equivalent series resistance (ESR), which represents the internal resistance of supercapacitor, including the resistance of the electrode, the resistance of the electrolyte, and the interface resistance between the electrode and the electrolyte [71] . The ESR value of RHPC‐N10 electrode is slightly smaller than that of the RHPC electrode, indicating the smaller internal resistance of RHPC‐N10 electrode.…”

“…The intercept of Nyquist curve on the horizontal axis is the equivalent series resistance (ESR), which represents the internal resistance of supercapacitor, including the resistance of the electrode, the resistance of the electrolyte, and the interface resistance between the electrode and the electrolyte. [71] The ESR value of RHPC-N10 electrode is slightly smaller than that of the RHPC electrode, indicating the smaller internal resistance of RHPC-N10 electrode. The EIS data was processed by the capacitance model C(ω) to obtain the relationship curve between the frequency and the normalized imaginary part capacitance C''(ω).…”

One-pot mechanochemical exfoliation of graphite andin situpolymerization of aniline for the production of graphene/polyaniline composites for high-performance supercapacitors

“…Moreover, the intercept on the real axis at the high frequency corresponds to the equivalent series resistance (R ES ) of the supercapacitor. 52 The impedance spectra were then tted according to the equivalent circuit, as shown inset Fig. 8c.…”