Excellent electrochemical properties and large CO 2 capture of nitrogen-doped activated porous carbon synthesised from waste longan shells

High Performance N‐Doped Carbon Electrodes Obtained via Hydrothermal Carbonization of Macroalgae for Supercapacitor Applications

“…This indicated that the higher content of N‐species could play a key role in the capacitance performance, probably due to the occurrence of pseudo‐capacitance . Capacitance retention for AHC‐ 800 at 20 A/g was also high, with a value of 80 %, owing to its relative large pore size and good electrical conductivity, which can partially promote electrolyte ions diffusion at high current densities . Furthermore, the energy density and power density of all the supercapacitors were calculated from equations (2) and (3), and results were summarized in Figure f in the form of Ragone plots.…”

“…High‐resolution C1s, N1s, and O1s XPS spectra for the prepared N‐doped carbons are shown in Figure and Figure S4. Four binding environments with binding energies at around 398.5, 400.4, 401.3, and 403.3 eV were found, ascribed to pyridinic, pyrrolic, graphitic and pyridine‐N‐oxide, respectively (Figure ) ,. High‐resolution C1s and O1s XPS spectra for all carbons demonstrating the existence of C and O atoms with different coordination environments are presented in Figure S4.…”

“…N‐doped porous carbons have attracted great interest due to their improved performance as electrodes in electrochemical storage, compared to their un‐doped analogous . However, the synthesis of N‐doped carbons usually requires long steps, which involve high carbonization temperature and further post‐treatment to introduce N. They can also be obtained from direct pyrolysis of N‐enriched metal‐organic frameworks (MOFs), and polymers such as the polypyrrole, polydopamine or polyacrylonitrile .…”

Waste wool derived nitrogen-doped hierarchical porous carbon for selective CO2 capture

“…3a) correspond to typical reections of the (002) and (100) planes of graphite, indicating the amorphous structure of WNPC-3. 42,43 The Raman spectrum (Fig. 3b) exhibits two characteristic peaks for WNPC-3 at around 1330 cm À1 (D-band) and 1590 cm À1 (Gband), which correspond to disordered carbon and the ordered graphite lattice, respectively.…”

Preparation of nitrogen-doped porous carbons for high-performance supercapacitor using biomass of waste lotus stems

“…For example, coconut shells are broadly used in production of commercial activated carbons. 13,14 More natural biomass materials, such as leaves, 15 pistachio nutshells, 16 auricularia, 17 shiitake mushroom, 18 longan shells, 19 potato, 20 waste celtuce leaves 21 and cherry stone 22 are also used in production of commercial activated carbons. As a perennial aquatic herb, lotus stems possess several large pores and abundant longitudinal ventilation holes, and its microstructure benets improvement of electrochemical performance of samples.…”