Chlorella-derived activated carbon with hierarchical pore structure for energy storage materials and adsorbents
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Chlorella-derived activated carbon (CDAC) with a high specific surface area and hierarchical pore structure was prepared as a CO2 adsorbent and as a supercapacitor electrode material. During KOH activation of Chlorella-derived carbon, metallic K gas penetrated from the outer walls to the inner cells, and pores formed on the outer frame and the inner surface. Micropores were dominant in CDAC, contributing toward a high specific surface area (> 3500 m2/g) and a hierarchical pore structure owing to the cell walls. Consequently, CDAC exhibited a high CO2 adsorption capacity (13.41 mmol/g at 10 atm and room temperature) and afforded high specific capacitance (142 F/g) and rate capability (retention ratio: 91.5%) in supercapacitors. Compared with woody- and herbaceous-biomass-derived activated carbons, CDAC has a superior specific surface area when the precursors are used without any pretreatment under the same conditions due to their soft components such as lipids and proteins. Furthermore, developing microalgae into high-value-added products is beneficial from both economic and environmental perspectives.
KeywordsChlorella vulgaris Biomass Activated carbon CO2 adsorbent Energy storage material
The study received support from the “R&D Program for Forest Science Technology (Project No. 2017053B10-1919-BB02)” of Korea Forest Service (Korea Forestry Promotion Institute). This work was supported by the Industry Technology Development Program (10080540, Development of filmtype flexible supercapacitors with microstructured electrodes based on nanomaterials) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).
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