Carbon electrodes supported with nickel oxide derived from olive pits for Li–O2 air cathode

Derya Akbulut*, Sara Pakseresht, Tugrul Cetinkaya, Ali Osman Kurt

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

A hybrid carbon composite material comprising bio-derived activated carbon and nickel oxide (AC/NiO) has been designed to decrease charge overpotential and enhance cyclability of lithium‑oxygen batteries (LOBs). The activated carbon products have been synthesized from olive seeds (S) via a physical activation process at different carbonization and activation temperatures. Activation reaction time and the effect of one-step and two-step physical activation processes were investigated to determine their effects on porosity, particle size, surface area, and yield % of AC products. The results demonstrated that the activated carbon produced in 3 h using one-step activation at 900 °C gave the highest surface area of 1048 m2/g. The electrochemical performance of products was further evaluated in LOB system. As a result, AC exhibited a low specific capacity of 3510 mAh g−1 at a current density of 100 mAh g−1 due to its poor catalytic activity and formation of parasite residues (such as Li2CO3). With this regard, flower-like nickel oxide was grown on the surface of AC to improve the catalytic activity of cathode materials. The AC particles provide numerous micro/meso/macropores that act as active sites (or nucleation sites) for the discharge reaction, while NiO on the AC surface forms a flower-like structure with good catalytic activity with its high adsorption behaviors in AC/NiO and enhances a higher specific capacity of 8870 mAh g−1.

Original languageEnglish
Article number109970
JournalDiamond and Related Materials
Volume136
Early online date28 Apr 2023
DOIs
Publication statusPublished - Jun 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Activated carbon
  • Activation
  • Biomass
  • Li-O batteries
  • Nickel oxide

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