The objectives of this work are to evaluate the use of the lignin as precursor of carbon xerogels and to determinate the effect of porosity and surface functionalities on the electrochemical capacitance of the activated carbon bio-xerogels. Lignin replaced the resorcinol at a mass fraction between 0 and 0.086 (wt%). The organic carbon xerogels are H3PO4-activated at H3PO4/carbon ratio of 1/1 at 450°C to increase pore volume and surface area. Gravimetric capacitance values at 0.125 A/g, in a three-cell configuration, ranged from 138 to 234 F/g. Sample with a 0.086 content of lignin showed the best electrochemical behavior, which was associated with the high BET surface area (1243 m2/g), high volume (W0(N2)= 0.518 cm3/g) and width micropores (L0(N2)= 1.43 nm) and to the presence of pseudo faradic effects.
|Number of pages||7|
|State||Published - 2016|
|Event||4th International Conference on Process Engineering and Advanced Materials, ICPEAM 2016 - Kuala Lumpur, Malaysia|
Duration: 15 Aug 2016 → 17 Aug 2016
Bibliographical noteFunding Information:
This work is part of the project Desarrollo de electrodos para supercondensadores a partir de xerogeles de carbono funcionalizados con lignina y triazina and is financed by COLCIENCIAS 658-2014 (Code: 121065842324). CDC acknowledges to COLCIENCIAS 2011 and UPB for doctoral study grant and financial support (Code: 113B-05/13-21). AUIP financed the international internship of CDC at Grupo de Investigacion de Materiales de Carbon, Universidad de Granada (Espana), where the electrochemical measurements were carried out.
© 2016 The Authors. Published by Elsevier Ltd.
- Activated carbon xerogels