Oxygen-doped activated carbons derived from three kinds of biomass: preparation, characterization and performance as electrode materials for supercapacitors

Abstract

Shown on left is SEM image of MG–AC. Shown on right are C1s XPS spectra of DF–AC. C1s spectra of DF–AC could be deconvoluted into five individual component peaks, indicating the existence of oxygen-containing groups in as-prepared activated carbon.

Sugarcane molasses as a pseudocapacitive material for supercapacitors

“…6,[15][16][17] Many activated carbons obtained by KOH chemical activation of biomass precursors have indeed shown excellent performances as electrode materials in supercapacitors with different electrolytes. As examples, waste dragon fruit skin, Momordica grosvenori skin and Firmiana catkins exhibited specic capacitances exceeding 230 F g À1 at 0.5 A g À1 in a three-electrode cell with 2 M KOH electrolyte, 18 activated carbons obtained from rice brans yielded specic capacitances of 265 F g À1 at 10 A g À1 in a two-electrode cell with 6 M KOH electrolyte, 19 and activated carbons obtained by HTC of cellulose, potato starch and eucalyptus wood sawdust allowed obtaining specic capacitances up to 236 F g À1 at 1 mV s À1 in a twoelectrode cell with tetraethyl ammonium tetrauoroborate (TEABF 4 )/acetonitrile (AN) electrolyte. 13 Even though higher specic capacitances are obtained aer activation processes, it should be recalled that activation processes are time consuming and may generate toxic wastes.…”

New hybrid materials based on the grafting of Pd(ii)-amino complexes on the graphitic surface of AC: preparation, structures and catalytic properties

“…[1][2][3][4][5][6][7] Nevertheless, ACs are accessible and low-cost materials as they are obtained not only from different natural sources, but also from waste materials (which are so converted into added value products). [2][3][4][5][6][7][8][9][10] Thus, ACs are extensively used as solid supports in heterogeneous catalysis due to their high surface areas, chemical stabilities and high adsorptivities are very important features for this purpose. The suitable control of the catalyst preparation from ACs is a crucial issue to reach large efficiency.…”

Dicarbonyl-tuned microstructures of hierarchical porous carbons derived from coal-tar pitch for supercapacitor electrodes

“…mixture-type isotherms with hysteresis loops, which indicates a combination of microporous/mesoporous structure. 41 The N 2 adsorption isotherms of all HPC-DK samples show a steep N 2 uptake at low relative pressure (P/P 0 < 0.001), reecting the existence of abundant micropores. The adsorption isotherms of HPC-DKs show an evident hysteresis loop in the medium pressure region (P/P 0 ¼ 0.4-0.9), indicating that a large number of mesopores exist in these HCPs.…”