期刊
CHEMSUSCHEM
卷 8, 期 6, 页码 1049-1057出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201403267
关键词
biomass; carbon; doping; electrochemistry; microporous materials
资金
- Spanish MINECO [MAT2012-31651]
Biomass-based highly porous carbons with excellent performances in aqueous electrolyte-based supercapacitors have been developed. The synthesis of these materials is based on the chemical activation of biomass-based hydrochar. The addition of melamine to the activation mixture leads to porous carbons with a porosity consisting of micropores/small mesopores. Furthermore, melamine promotes the introduction of nitrogen heteroatoms in the carbon framework, along with abundant oxygen functionalities, to improve the wettability. The materials produced in the presence or absence of melamine exhibit high specific capacitances in aqueous electrolytes (>270Fg(-1) in H2SO4 and >190Fg(-1) in Li2SO4). Additionally, the mesopores present in the melamine-based micro-/mesoporous carbons notably improve the ion-transport kinetics, especially in Li2SO4. Furthermore, in Li2SO4, they remain stable up to a cell voltage of 1.6V; thus exhibiting superior energy and power characteristics than those in H2SO4.
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