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High efficiency electricity and gas cogeneration through direct carbon solid oxide fuel cell with cotton stalk biochar

Author

Listed:
  • Gu, Xiaofeng
  • Yan, Xiaomin
  • Zhou, Mingyang
  • Zou, Gaochang
  • Fan, Zidai
  • Liu, Jiang

Abstract

For the first time, biochar derived from a renewable resource, cotton stalk, is used as the feedstock of direct carbon solid oxides fuel cells (DC-SOFCs) for electricity and gas cogeneration. It turns out that the cotton stalk biochar has plenty of naturally grown K and Ca, which are active catalysts for the reverse Boudouard reaction in DC-SOFCs. This natural advantage of the cotton stalk biochar enables an extremely high power density of an anode-supported DC-SOFC at 850 °C, 0.9 W cm−2, which is the highest among those of the reported DC-SOFCs. Meanwhile, high concentration of CO gas, which is an important feedstock for chemical industry, is obtained from the DC-SOFCs. The energy conversion efficiency of the electricity-gas cogeneration of DC-SOFCs reaches over 70%. A novel method, using compressed char, is proposed and carried out for continuous supply of cotton stalk char to a DC-SOFC. The present work has demonstrated the feasibility and advantages of cogenerating electricity and gas through DC-SOFCs with biochar derived from cotton stalk as the feedstock.

Suggested Citation

  • Gu, Xiaofeng & Yan, Xiaomin & Zhou, Mingyang & Zou, Gaochang & Fan, Zidai & Liu, Jiang, 2024. "High efficiency electricity and gas cogeneration through direct carbon solid oxide fuel cell with cotton stalk biochar," Renewable Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:renene:v:226:y:2024:i:c:s0960148124005366
    DOI: 10.1016/j.renene.2024.120471
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