Synthesis of Boron and Nitrogen Codoped Porous Carbon Foam for High Performance Supercapacitors

Abstract

A facile and efficient method to prepare boron and nitrogen codoped porous carbon foam (BNPC) derived from starch with urea as nitrogen source and boric acid as both boron source and templet is presented. The codoping strategy can boost the synergistically doping amounts of boron and nitrogen, which can achieve a great increase in the doping efficiency of boron (three times higher than single boron doping) and nitrogen. Due to its hierarchical pore structure with moderate specific surface and relatively high nitrogen (9.38 at. %) and boron (3.87 at. %), the BNPC electrode exhibits outstanding electrochemical performances with an ultrahigh specific capacity of 402 F g–1 at a current density of 0.5 A g–1 and retains 266 F g–1 even at a current density of 20 A g–1 in 6 M KOH electrolyte. In addition, a symmetric device based on BNPC electrodes delivers a respectable energy density of 21.9 Wh kg–1 in 1 M Na2SO4 electrolyte. Therefore, this work provides a simple and efficient method to synthesize heteroatom-doped hierarchical porous carbon materials for advanced energy storage systems.

Constructing Hierarchically Porous N-Doped Carbons Derived from Poly(ionic liquids) with the Multifunctional Fe-Based Template for CO2 Adsorption

“…The asymmetric N 1s peaks could be decomposed into three peaks mainly made up of pyridinic N (397.8 ± 0.2 eV), pyrrolic N (399.5 ± 0.3 eV), and graphitic-type quaternary N (400.7 ± 0.1 eV). 50 , 51 The N contents on the surfaces of NDC-800 and NDPC-1-800 tested by XPS were 6.60 and 2.78 wt %, respectively, which were almost the same as those (8.81 and 2.62 wt %) in the bulk materials detected by elemental analyses, indicating a uniform dispersion of N atoms, and the result was well coincident with the EDS elemental mapping analysis (see Figure 1 f). Moreover, relatively more pyridinic and pyrrolic nitrogen inferred from the N 1s XPS spectra existed in these two carbons, which were in favor of CO 2 capture.…”

Liquid‐State Templates for Constructing B, N, Co‐Doping Porous Carbons with a Boosting of Potassium‐Ion Storage Performance

“…[ 39 ] For the high‐resolution XPS C 1s spectra in Figure 3c, five characteristic peaks were observed centered at 284.0, 284.8, 285.6, 286.7, and 290.6 eV, corresponding to CB, CC, CO/CN, CO/CNB, and COOR chemical bonding, respectively. [ 39–41 ] Notably, for the high‐resolution XPS N 1s spectra (Figure 3d), besides the chemical bonding associated with N6 (398.2 eV), N5 (400.8 eV), and NQ (403.2 eV), [ 42–44 ] a characteristic peak with a 399.2 eV binding energy is observed for BN‐PC, which is attributed to CNB chemical bonding. [ 36,39,43,45 ] Correspondingly, in the high‐resolution B 1s spectra (Figure 3e), an additional peak centered at 191.6 eV is assigned to the CNB chemical bonding.…”

A high energy flexible symmetric supercapacitor fabricated using N-doped activated carbon derived from palm flowers

“…The NAC-2 sample seem to have higher content of graphitic nitrogen which is the reason for showing slightly higher conductivity. The nitrogen atoms in the cyclic carbon framework impart rich electronic structure, different from pure carbon, to NAC-2 sample which is expected to enhance the pseudocapacitance by redox reactions as well as increase in the conductivity of carbon materials [47].…”