, Volume 25, Issue 7, pp 3443–3452 | Cite as

Porous carbon electrodes from activated wasted coffee grounds for capacitive deionization

  • Min QianEmail author
  • Xiao Yang Xuan
  • Li Kun Pan
  • Shang Qing Gong
Original Paper


Wasted coffee grounds (WCGs) were activated by a pyrolysis process using KOH, where the porosity increased with temperature, exhibiting a micropore-dominant structure. WCGs upon an activation temperature of 800 °C (AWCG800) showed a surface area up to 1856 m2 g−1 and a specific capacitance of 180.3 F g−1 in 1 M NaCl solution at a scan rate of 10 mV s−1. The AWCG800 electrodes showed an electrosorption capacity up to 12.50 and 16.50 mg g−1 in NaCl solution at cell voltages of 1.2 and 1.4 V, respectively, with an initial concentration of 5 mM. X-ray photoelectron spectroscopy analysis indicated that AWCG800 maintained a high carbon content of 87 at% upon the activation process. The study suggests a practical way for converting WCGs into mesoporous and microporous carbons with large surface area and pore volume, high carbon component, and good wettability to water, which is promising for capacitive deionization application.


Capacitive deionization Microporous carbon Activated waste coffee grounds 



This work is sponsored by the National Natural Science Foundation of China (Grant No. 61804054), the Natural Science Foundation of Shanghai (18ZR1410400), Shanghai Sailing Program (17YF1403300), and the Fundamental Research Funds for the Central Universities (Project No. 222201714017).

Supplementary material

11581_2019_2887_MOESM1_ESM.doc (1.5 mb)
ESM 1 (DOC 1501 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Min Qian
    • 1
    Email author
  • Xiao Yang Xuan
    • 1
  • Li Kun Pan
    • 2
  • Shang Qing Gong
    • 1
  1. 1.Department of Physics, School of ScienceEast China University of Science and TechnologyShanghaiPeople’s Republic of China
  2. 2.Shanghai Key Laboratory of Magnetic Resonance, School of Physics and MaterialsEast China Normal UniversityShanghaiPeople’s Republic of China

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