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Sustainable Porous Activated Carbon Derived from Cotton for High Power Supercapacitor and CO2 Storage Applications

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Eco-friendly, cost effective, easily scalable and naturally available materials have drawn considerable attention due to its potential applications as energy storage materials. In this study, cotton has been used as base material for producing activated carbonized porous structures with high surface area and high pore volume. These materials have been tested as electrode for supercapacitor and adsorbent for carbon dioxide. The carbonization of cotton has been performed by heat treating the cotton at 800 °C in Argon atmosphere. Two types of activation procedures namely 'Pre-activation' and 'Post-activation' have been followed to obtain two different types of activated carbons with different pore volumes and surface areas. The samples have been characterized using SEM, XRD, BET surface area analysis and Raman spectroscopy. The pre and post activated carbons showed a specific capacitance of 121 and 127 F g–1 respectively in KOH electrolyte with pre-activated sample showing high capacitance retention at higher scan rates. Compared to post-activation procedure, the pre-activation leads to low IR drop and good ion accessibility which helps in achieving a high power density of 19.5 kW kg–1. On the other hand, carbonized cotton adsorbs 2.61 mmolg–1 of CO2 at 278 K sample pressure and 100 kPa equilibrium pressure. The pre- and post-activation improves the CO2 adsorption capacity as high as 67 and 70%, respectively. It is also concluded from thermodynamic analysis that improvement in adsorption capacity is due to high surface are and pore volume.
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Keywords: CO2 STORAGE; COTTON; KOH ACTIVATION; POWER DENSITY; SUPERCAPACITOR

Document Type: Research Article

Publication date: June 1, 2018

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  • ADVANCED POROUS MATERIALS (APM) is an international peer-reviewed journal that publishes research activities on the fundamental aspects, synthesis, advanced characterization, structural properties, and multiple applications of all kinds of novel micro, meso-, nano- and macro-porous materials. APM also offers unique opportunity to report the energy and environmental related applications of advanced porous materials addressing significant environmental problems as a result of global climate changes. APM publishes reviews, full-length papers, and short communications, covering materials including zeolites, zeotypes, metal organic frameworks, layered materials, porous carbons, nitrides, metals, polymers, phosphides, chalcogenides, transition metal oxides, hydroxyapatite, gels, fibers, ceramics, glasses, membranes, and thermoelectric materials, mesoporous silica, amorphous and crystalline mesoporous metallosilicates, mesoporous hybrid materials, nanocomposites, porous organic molecules, graphenes, and open framework materials, and their applications in catalysis, sensing, adsorption, separation, drug delivery, magnetism, battery, supercapacitors, solar cells, nanodevices, and fine chemical synthesis.
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