Asymmetric capacitors using lignin-based hierarchical porous carbons

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Title: Asymmetric capacitors using lignin-based hierarchical porous carbons
Authors: Salinas Torres, David | Ruiz-Rosas, Ramiro | Valero-Romero, María José | Rodríguez-Mirasol, José | Cordero, Tomás | Morallon, Emilia | Cazorla-Amorós, Diego
Research Group/s: Materiales Carbonosos y Medio Ambiente | Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Supercapacitors | Hierarchical porous carbon | Lignin | Green chemistry
Knowledge Area: Química Inorgánica | Química Física
Issue Date: 3-Apr-2016
Publisher: Elsevier
Citation: Journal of Power Sources. 2016, 326: 641-651. doi:10.1016/j.jpowsour.2016.03.096
Abstract: Hierarchical porous carbons (HPC) were fabricated from lignin by hard template method using Beta and Y zeolites as templates. Textural properties were dictated by the hard template, obtaining a bi-modal pore size distribution with similar micropore sizes but different mesopore sizes. These HPCs provide a well-connected and developed porosity that show capacitance values near to 140 F g−1 in 1 M H2SO4 at 1 A g−1 and a capacitance retention of ca. 50% and 40% when the specific current is increased from 1 to 64 A g−1 for the Y and the Beta-based carbons, respectively. A symmetric capacitor working at 1.2 V with energy densities of 4.2 Wh kg−1 at 1.3 kW kg−1 has been obtained using the Beta-based HPC. Asymmetric in mass design allowed to operate the capacitor safely at 1.4 V, yielding an energy density of 6.3 Wh kg−1 at 1.3 kW kg−1, an increase of 50% with respect to the symmetric configuration, while keeping a maximum power near to 50 kW kg−1. This capacitor has an energy density comparable to that of a symmetric supercapacitor built using a commercial activated carbon of much higher porosity development, outperforming it in terms of energy, coulombic efficiencies and maximum power.
ISSN: 0378-7753 (Print) | 1873-2755 (Online)
DOI: 10.1016/j.jpowsour.2016.03.096
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier B.V.
Peer Review: si
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