Journal
CHEMSUSCHEM
Volume 9, Issue 14, Pages 1880-1888Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600426
Keywords
biomass; carbon; mesoporous materials; microporous materials; potassium
Funding
- FICYT Regional Project [GRUPIN14-102]
- Spanish MINECO [CTQ2015-63552-R]
- Fondo Europeo de Desarrollo Regional (FEDER)
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Sustainable synthesis schemes for the production of porous carbons with appropriate textural properties for use as super-capacitor electrodes are in high demand. In this work a greener option to the widely used but corrosive KOH is proposed for the production of highly porous carbons. Hydrochar products are used as carbon precursors. It is demonstrated that a mild alkaline potassium salt such as potassium bicarbonate is very effective to generate porosity in hydrochar to lead to materials with large surface areas (>2000 m(2)g(-1)) and a tunable pore size distribution. Furthermore, the use of KHCO3 instead of KOH gives rise to a significant 10% increase in the yield of activated carbon, and the spherical morphology of hydrochar is retained, which translates into better packing properties and reduced ion diffusion distances. These features lead to a super-capacitor performance that can compete with, and even surpass, that of KOH-activated hydrochar in a variety of electrolytes.
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