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Mechanism investigation of carboxyl functional groups catalytic oxidation in coal assisted water electrolysis cell

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  • Kou, Kaikai
  • Zhou, Wei
  • Chen, Shuai
  • Gao, Jihui

Abstract

The electric energy consumption for H2 production can be significantly reduced by integrating chemical energy of coal in the coal assisted water electrolysis (CAWE) process. While the oxidation mechanism of coal has not been comprehensively demonstrated. In this work, the oxidation mechanism of carboxyl group, a typical oxygen-functional group of coal, was systematically investigated by preparing a model compound of carboxylated graphene. For direct oxidation of carboxylated graphene (GCM), the onset potential was close to 1.2 V at ambient temperature. The apparent activation energy for hydrogen production was dramatically diminished by electrolysis of GCM slurry. The products analysis indicated that carboxyl groups can be oxidized to CO and CO2 at 90 °C around 1.6 V Fe3+ was sufficient to oxidize carboxyl groups to generate Fe2+ at 90 °C. The chemical oxidation of carboxyl groups was a first-order reaction accompanied by adsorption, oxidization and desorption stages. In the presence of Fe2+/Fe3+, electrolysis initiated at about 0.5 V. A gentle slope of voltage from 0.6 V to 1.2 V was observed in the continuous electrolysis and the regeneration of Fe2+ became the limiting step for a long period of time. The results are essential to guide the application of CAWE.

Suggested Citation

  • Kou, Kaikai & Zhou, Wei & Chen, Shuai & Gao, Jihui, 2021. "Mechanism investigation of carboxyl functional groups catalytic oxidation in coal assisted water electrolysis cell," Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:energy:v:226:y:2021:i:c:s0360544221004928
    DOI: 10.1016/j.energy.2021.120243
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    References listed on IDEAS

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    1. Chen, Shuai & Zhou, Wei & Ding, Yani & Zhao, Guangbo & Gao, Jihui, 2021. "Fe3+-mediated coal-assisted water electrolysis for hydrogen production: Roles of mineral matter and oxygen-containing functional groups in coal," Energy, Elsevier, vol. 220(C).
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    3. Gong, Xuzhong & Wang, Mingyong & Liu, Yang & Wang, Zhi & Guo, Zhancheng, 2014. "Variation with time of cell voltage for coal slurry electrolysis in sulfuric acid," Energy, Elsevier, vol. 65(C), pages 233-239.
    4. Sonibare, Oluwadayo O. & Haeger, Tobias & Foley, Stephen F., 2010. "Structural characterization of Nigerian coals by X-ray diffraction, Raman and FTIR spectroscopy," Energy, Elsevier, vol. 35(12), pages 5347-5353.
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    2. Huang, Yuming & Zhou, Wei & Xie, Liang & Li, Jiayi & He, Yong & Chen, Shuai & Meng, Xiaoxiao & Gao, Jihui & Qin, Yukun, 2022. "Edge and defect sites in porous activated coke enable highly efficient carbon-assisted water electrolysis for energy-saving hydrogen production," Renewable Energy, Elsevier, vol. 195(C), pages 283-292.

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