Chlorella-derived activated carbon with hierarchical pore structure for energy storage materials and adsorbents

Joah Han, Kyubock Lee, Min Sung Choi, Ho Seok Park, Woong Kim, Kwang Chul Roh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Chlorella-derived activated carbon (CDAC) with a high specific surface area and hierarchical pore structure was prepared as a CO 2 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 m 2 /g) and a hierarchical pore structure owing to the cell walls. Consequently, CDAC exhibited a high CO 2 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.

Original languageEnglish
Pages (from-to)167-175
Number of pages9
JournalCarbon Letters
Volume29
Issue number2
DOIs
Publication statusPublished - 2019 Apr 1

Keywords

  • Activated carbon
  • Biomass
  • Chlorella vulgaris
  • CO adsorbent
  • Energy storage material

ASJC Scopus subject areas

  • Ceramics and Composites
  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Process Chemistry and Technology
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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