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Title

A Green Approach to High-Performance Supercapacitor Electrodes: The Chemical Activation of Hydrochar with Potassium Bicarbonate

AuthorsSevilla Solís, Marta ; Fuertes Arias, Antonio Benito
KeywordsBiomass
Carbon
Mesoporous materials
Microporous materials
Potassium
Issue Date7-Jun-2016
PublisherWiley-VCH
CitationChemSusChem 9(14): 1880-1888 (2016)
AbstractSustainable synthesis schemes for the production of porous carbons with appropriate textural properties for use as supercapacitor 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 m2 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 supercapacitor performance that can compete with, and even surpass, that of KOH-activated hydrochar in a variety of electrolytes.
DescriptionThis is the accepted version of the following article: M. Sevilla, A. B. Fuertes, ChemSusChem 2016, 9, 1880., which has been published in final form at http://dx.doi.org/10.1002/cssc.201600426. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy
Publisher version (URL)http://dx.doi.org/10.1002/cssc.201600426
URIhttp://hdl.handle.net/10261/139336
DOI10.1002/cssc.201600426
ISSN1864-5631
E-ISSN1864-564X
Appears in Collections:(INCAR) Artículos
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