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Coal slime waste: a promising precursor to develop highly porous activated carbon for supercapacitors

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2020, 30(6), pp.657-665
  • DOI : 10.1007/s42823-020-00138-w
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : December 13, 2019
  • Accepted : April 2, 2020
  • Published : December 1, 2020

Li Jiajia 1 Hu Jiajun 1 Wang Kai 1 Xia Hongyan 1

1Xi’an Jiaotong University

Accredited

ABSTRACT

Efective processing and use of coal slime is of great signifcance to protect the environment and save resources. Diferent coal slimes (untreated with 43 wt% ash content, crushed and fotation treated with 10 wt% ash content, and pre-carbonized) were activated with KOH to prepare porous activated carbon. The results show the activated carbon prepared from coal slime with 10 wt% ash had high specifc surface area (3037 m2 /g) and pore volume (1.66 cm3 /g), which was ascribed to the suitable contents of minerals as template and oxygen-containing functional groups. Electrochemical measurements exhibited the best specifc capacitance of 220 F/g at 0.1 A/g and the cycle stability of over 100% capacitance retention after 1000 cycles at 5 A/g in 6 M KOH solution. Due to the high specifc surface area, superior electrochemical performance, and facile and low cost, developing highly porous activated carbon for supercapacitors is one alternative way for efective use of coal slime waste.

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