Valorization of Exhausted Olive Pomace for the Production of a Fuel for Direct Carbon Fuel Cell

Najla Grioui*, Amal Elleuch, Kamel Halouani, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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In this study, exhausted olive pomace (EOP) biochar prepared by carbonization at 400 °C is investigated as a fuel in a direct carbon fuel cell (DCFC) with an electrolyte-supported configuration. The feasibility of using the EOP biochar in the DCFC is confirmed, showing a maximum power density of 10 mW·cm−2 at 700 °C. This limited DCFC performance is compared with other biochars prepared under similar conditions and interrelated with various biochar physico-chemical characteristics, as well as their impact on the DCFC’s chemical and electrochemical reaction mechanisms. A high ash content (21.55%) and a low volatile matter (40.62%) content of the EOP biochar are among the main causes of the DCFC’s limited output. Silica is the major impurity in the EOP biochar ash, which explains the limited cell performance as it causes low reactivity and limited electrical conductivity because of its non-crystal structure. The relatively poor DCFC performance when fueled by the EOP biochar can be overcome by further pre- and post-treatment of this renewable fuel.
Original languageEnglish
Article number22
Number of pages26
JournalC - Journal of Carbon Research
Issue number1
Publication statusPublished - 14 Feb 2023
MoE publication typeA1 Journal article-refereed


  • DCFC
  • Biochar
  • Electrochemistry
  • Exhausted olive pomace
  • Limitations


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