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

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

Applied Energy, 2016, vol. 173, issue C, 52-58

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.

Keywords: Solid oxide electrolysis cell; Carbon gasification; Syngas production (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:173:y:2016:i:c:p:52-58

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DOI: 10.1016/j.apenergy.2016.03.116

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