<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082022000100233</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.1585</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Materiales carbonosos jerarquizados derivados de la borra de café para su aplicación en supercondensadores]]></article-title>
<article-title xml:lang="en"><![CDATA[Hierarchical carbonaceous materials derived from spent coffee grounds for application in supercapacitors]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arredondo-Ferrer]]></surname>
<given-names><![CDATA[Estefanía]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Buitrago-Sierra]]></surname>
<given-names><![CDATA[Robison]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[Diana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Antioquia Facultad de Ciencias Exactas y Naturales ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico Metropolitano-ITM Facultad de Ingeniería ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<volume>46</volume>
<numero>178</numero>
<fpage>233</fpage>
<lpage>247</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082022000100233&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082022000100233&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082022000100233&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El uso de residuos de borra de café para la obtención de carbones activados mediante carbonización hidrotérmica se ha abordado de forma poco sistemática en la literatura, lo que sumado a la necesidad de mejorar los sistemas de almacenamiento de energía, exige la realización de estudios sistemáticos de estos procesos. En el presente trabajo se obtuvieron carbones activados con porosidad jerarquizada a partir de biomasa por medio de carbonización hidrotérmica y activaciones químicas. Se analizó el efecto del tiempo y la temperatura de la carbonización hidrotérmica de la borra de café, con el fin de obtener un alto grado de carbonización y mejores rendimientos de reacción. En cuanto a la porosidad, se utilizaron tres agentes directores de estructura para obtener una distribución de poros jerarquizada. Con respecto al desarrollo de los materiales, el análisis termogravimétrico y el elemental confirmaron la obtención de un material mucho más carbonizado con la carbonización hidrotérmica a 250 °C durante 6 h, en tanto que a 200 °C durante 6 h se logró un mayor rendimiento de reacción. Los carbones activados se caracterizaron utilizando isotermas y micrografías de microscopía electrónica de barrido (MEB) para el análisis de la porosidad y el área superficial, y se comprobó que todos los materiales sintetizados obtuvieron una distribución jerárquica de poros. Asimismo, se evaluó el comportamiento de los materiales como electrodos para supercondensadores, evidenciándose una mejor capacitancia específica con el carbón obtenido por activación con hidróxido de potasio (KOH).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The use of spent coffee grounds residues to obtain activated carbons by hydrothermal carbonization has not been approached in a systematic way in the literature, which, added to the need for improved energy storage systems, requires systematic studies of these processes. Here we obtained activated carbons with hierarchical porosity from biomass through hydrothermal carbonization and chemical activations. We analyzed the effect of the time and temperature of the hydrothermal carbonization of spent coffee grounds to obtain a high degree of carbonization and better reaction yields. As for the porosity, we used three structural directors to obtain a hierarchical pore distribution. Regarding the development of materials, the thermogravimetric and elemental analyses confirmed that hydrothermal carbonization at 250 °C for 6 h yielded much more carbonized material while at 200 °C for 6 h, a higher reaction performance was achieved. We also characterized the activated coals by isotherms and SEM micrographs to ensure the porosity and surface area required for obtaining a hierarchical distribution of pores in all the synthesized materials. Likewise, we evaluated their behavior as electrodes for supercapacitors obtaining a better specific capacitance with the carbon obtained by activation with potassium hydroxide (KOH).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Borra de café]]></kwd>
<kwd lng="es"><![CDATA[Carbonización hidrotérmica]]></kwd>
<kwd lng="es"><![CDATA[Supercondensadores]]></kwd>
<kwd lng="es"><![CDATA[Activación química]]></kwd>
<kwd lng="es"><![CDATA[Condensadores electroquímicos de doble capa-EDLC]]></kwd>
<kwd lng="en"><![CDATA[Spent coffee grounds]]></kwd>
<kwd lng="en"><![CDATA[Hydrothermal carbonization]]></kwd>
<kwd lng="en"><![CDATA[Chemical activation]]></kwd>
<kwd lng="en"><![CDATA[Supercapacitors]]></kwd>
<kwd lng="en"><![CDATA[EDLC]]></kwd>
</kwd-group>
</article-meta>
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