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Efficient syngas generation for electricity storage through carbon gasification assisted solid oxide co-electrolysis

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  • Lei, Libin
  • Wang, Yao
  • Fang, Shumin
  • Ren, Cong
  • Liu, Tong
  • Chen, Fanglin

Abstract

High temperature CO2 and H2O co-electrolysis is a promising way to produce syngas for the storage of electrical energy harvested from renewable energy sources. However, a significant portion of electricity input is consumed to overcome a large oxygen potential gradient between the electrodes in conventional solid oxide electrolysis cells (SOECs). In this study, we present a novel and efficient syngas generator integrating carbon gasification and solid oxide co-electrolysis to improve the system efficiency. The feasibility of this new system is demonstrated in La0.9Sr0.1Ga0.8Mg0.2O3 (LSGM) electrolyte-supported SOECs. Both thermodynamic calculation and experimental results show that the potential barrier for co-electrolysis can be reduced by about 1V and the electricity input can be saved by more than 90% upon integration of SOECs with carbon gasification. On the anode side, “CO shuttle” between the electrochemical reaction sites and solid carbon is realized through the Boudouard reaction (C+CO2=2CO). Simultaneous production of CO on the anode side and CO/H2 on the cathode side generates syngas that can serve as fuel for power generation or feedstock for chemical plants. The integration of carbon gasification and SOECs provides a potential pathway for efficient utilization of electricity, coal/biomass, and CO2 to store electrical energy, produce clean fuel, and achieve a carbon neutral sustainable energy supply.

Suggested Citation

  • Lei, Libin & Wang, Yao & Fang, Shumin & Ren, Cong & Liu, Tong & Chen, Fanglin, 2016. "Efficient syngas generation for electricity storage through carbon gasification assisted solid oxide co-electrolysis," Applied Energy, Elsevier, vol. 173(C), pages 52-58.
    • Handle: RePEc:eee:appene:v:173:y:2016:i:c:p:52-58
    DOI: 10.1016/j.apenergy.2016.03.116
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    6. Pan, Zehua & Liu, Qinglin & Zhang, Lan & Zhou, Juan & Zhang, Caizhi & Chan, Siew Hwa, 2017. "Experimental and thermodynamic study on the performance of water electrolysis by solid oxide electrolyzer cells with Nb-doped Co-based perovskite anode," Applied Energy, Elsevier, vol. 191(C), pages 559-567.
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