Fabricating a modified biochar-based all-solid-state flexible microsupercapacitor using pen lithography

Hyeong Ryeol Kim, Ju Hun Lee, Soo Kweon Lee, Youngsang Chun, Chulhwan Park, Joon Hyung Jin, Hee Uk Lee, Seung Wook Kim

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Despite an increasing interest in supercapacitors using biochar for fabricating eco-friendly energy modules, fabrication processes for most biochar-based supercapacitors are neither flexible nor easy. In this study, we fabricated an all-solid-state flexible MnO2/HNO3 pretreated biochar (NBC)/Poly(3,4-ethylenedioxythiophene) (PEDOT) composite microsupercapacitor (MSC) using pen lithography. Dispersion of biochar as ink for pen lithography was improved by HNO3 pretreatment. Specific surface area and graphitic carbon structure of the biochar were also increased by HNO3 pretreatment, resulting a high capacitance of electrochemical double layer. The fabricated MSC showed an increased pseudocapacitive behavior after adding an optimized amount of MnO2. Its capacitance was 76.6 F g−1 at 0.1 A g−1 of current density with an energy density of 14.0 Wh kg−1 at a power density of 53.1 W kg−1. The capacitive behavior of the fabricated MSC was stable over 500 bending cycles. The proposed MSC can be applied to fabricate flexible and eco-friendly energy modules.

Original languageEnglish
Article number125449
JournalJournal of Cleaner Production
Publication statusPublished - 2021 Feb 15

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd


  • Flexible microsupercapacitor
  • HNO pretreated biochar
  • MnO
  • Pen lithography
  • Poly(3,4-ethylenedioxythiophene)

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Environmental Science
  • Strategy and Management
  • Industrial and Manufacturing Engineering


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