Nitrogen-doped highly dense but porous carbon microspheres with ultrahigh volumetric capacitance and rate capability for supercapacitors

Abstract

Controlling the dosage ratio of KOH to samples for an optimized porous structure with both high gravimetric capacitance and high volumetric capacitance.

Electrodeposition of Co(OH)2 Improving Carbonized Melamine Foam Performance for Compressible Supercapacitor Application

“…It can be seen that Nyquist plots illustrate a semicircle shape at high frequency and the intercept of the semicircle arc with real axis represents R s , which contains intrinsic resistance of the CMF/Co­(OH) 2 material, ionic resistance of the electrolyte, and contact resistance between the CMF/Co­(OH) 2 electrode and current collector . The diameter of the semicircle describes the charge-transfer resistance ( R ct ) for the redox reaction in the electrode/electrolyte. − The straight line at the low frequency region depicts Warburg resistance ascribed to ion diffusion transfer resistance . CMF/Co­(OH) 2 exhibits a smaller intercept value (0.845 Ω) than CMF (2.44 Ω), and CMF/Co­(OH) 2 shows a smaller semicircle than CMF in the high frequency range, and these indicate that the CMF/Co­(OH) 2 electrode material exhibits greater conductivity and lower charge-transfer resistance (2.76 Ω) than those of CMF.…”

An overview of high-performance phthalonitrile resins: fabrication and electronic applications

“…In particular, after doping with nitrogen atoms, the capacitance of the carbon material could be significantly enhanced. 83 The methods for manufacturing the nitrogen-doped carbon materials are mainly amine impregnation and direct pyrolysis of nitrogen-containing precursors. As mentioned before, the phthalonitrile resins are formed by cross-linking nitrogen-containing heterocycles, which are very suitable to serve as the precursors for building the nitrogen-doped carbon material.…”

2D polyaniline with exchangeable interlayer fluid for fast and stable volumetric dual ion storage

“…activated carbon, N-doped porous carbon foam and porous graphitic carbon [4][5][6]. However, given the low density of porous carbon-based materials, their application in compact devices may be limited [7]. A novel dual ion host with large interlayer spacing, high volumetric performance and long lifespan is highly demanded for advanced LICs.…”