Eco-friend air electrode for flexible quasi-solid-state electrolyte zinc-air battery based on spherical glucose biochar derived from biorefinery process

  • H. R. Kim
  • , Y. Ji
  • , Y. Chun
  • , J. H. Lee
  • , H. Y. Yoo
  • , S. Kim
  • , C. Park
  • , S. W. Kim*
  • *Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Biorefinery using waste biomass is a key technology for sustainable development and is widely used in renewable energy production. However, biorefineries for energy storage applications have rarely been studied. In this study, a zinc-air battery (ZAB), which is one of the eco-friendlier energy storage devices, is proposed using the biorefinery process. The spherical glucose biochar (SGBC) was produced by a two-step process. The first step was the saccharification which included NaOH pretreatment and enzymatic hydrolysis. The second step was the carbonization including hydrothermal reactions and carbonization. The SGBC/MnO2/poly(3,4-ethylenedioxythiophene) (PEDOT) composite (SMP) was produced by in-situ polymerization with Fe(ClO4)3. The SMP exhibited excellent oxygen reduction reactions (ORR) and oxygen evolution reaction (OER) comparable to Pt/C due to the complementary effects of each component. Therefore, the fabricated flexible quasi-solid-state electrolyte SMP-based ZAB (SMP-ZAB) displayed high performance. The SMP-ZAB exhibited a peak power density of 101.2 mW/cm3. The discharge was maintained for 9.6 h at 5 mA/cm3 and the charge-discharge cycle was maintained for 16 h without remarkable potential change (5 min each for charge and discharge at 5 mA/cm3). In addition, the SMP-ZAB could theoretically produce 9540 cells from 1000 g of chestnut shell (CNS), demonstrating the potential of mass production for industrial-scale production (electrode area: 4 cm2). These results suggest that the SMP-ZAB could be applied as a future wearable energy device with an eco-friendly process.

    Original languageEnglish
    Article number100456
    JournalMaterials Today Sustainability
    Volume23
    DOIs
    Publication statusPublished - 2023 Sept

    Bibliographical note

    Publisher Copyright:
    © 2023 Elsevier Ltd

    UN SDGs

    This output contributes to the following UN Sustainable Development Goals (SDGs)

    1. SDG 7 - Affordable and Clean Energy
      SDG 7 Affordable and Clean Energy
    2. SDG 13 - Climate Action
      SDG 13 Climate Action

    Keywords

    • Bifunctional catalyst
    • Energy storage
    • MnO
    • Poly(3,4-ethylenedioxythiophene) (PEDOT)
    • Spherical glucose biochar (SGBC)
    • Sustainable process

    ASJC Scopus subject areas

    • General Chemistry
    • Renewable Energy, Sustainability and the Environment
    • General Materials Science

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