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Correlations between electrochemical resistances and surface properties of acid-treated fuel in coal fuel cells

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  • Eom, Seongyong
  • Ahn, Seongyool
  • Kang, Kijoong
  • Choi, Gyungmin

Abstract

Herein, we investigate the relationship between fuel surface properties and inner resistances of direct carbon fuel cells (DCFCs) by subjecting raw coal to a liquid-phase chemical treatment and correlating its surface property changes (e.g., degree of oxidation, surface area, and ash composition) with those of electrochemical resistances. Fuel surface characteristics are analyzed by thermogravimetry, gas adsorption, and X-ray photoelectron spectroscopy, with correlations established using the Pearson correlation analysis. The obtained results show that the surface Si content is strongly correlated with electrolyte resistance due to influencing the concentration of carbonate ions. Moreover, charge transfer resistance is strongly negatively correlated with the surface oxygen content, since oxygenated functional groups (e.g., carbonyl and quinone moieties) enhance the oxidation of solid carbon by increasing its reactivity and wettability.

Suggested Citation

  • Eom, Seongyong & Ahn, Seongyool & Kang, Kijoong & Choi, Gyungmin, 2017. "Correlations between electrochemical resistances and surface properties of acid-treated fuel in coal fuel cells," Energy, Elsevier, vol. 140(P1), pages 885-892.
    • Handle: RePEc:eee:energy:v:140:y:2017:i:p1:p:885-892
    DOI: 10.1016/j.energy.2017.09.034
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    References listed on IDEAS

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    Cited by:

    1. Cheng, Tinghai & Fu, Xianpeng & Liu, Wenbo & Lu, Xiaohui & Chen, Xiyan & Wang, Yingting & Bao, Gang, 2019. "Airfoil-based cantilevered polyvinylidene fluoride layer generator for translating amplified air-flow energy," Renewable Energy, Elsevier, vol. 135(C), pages 399-407.
    2. Eom, Seongyong & Na, Sangkyung & Ahn, Seongyool & Choi, Gyungmin, 2022. "Electrochemical conversion of CO2 using different electrode materials in an Li–K molten salt system," Energy, Elsevier, vol. 245(C).
    3. Xie, Heping & Zhai, Shuo & Chen, Bin & Liu, Tao & Zhang, Yuan & Ni, Meng & Shao, Zongping, 2020. "Coal pretreatment and Ag-infiltrated anode for high-performance hybrid direct coal fuel cell," Applied Energy, Elsevier, vol. 260(C).

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