Journal
APPLIED ENERGY
Volume 173, Issue -, Pages 52-58Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2016.03.116
Keywords
Solid oxide electrolysis cell; Carbon gasification; Syngas production
Categories
Funding
- U.S. National Science Foundation [DMR-1210792]
- Fundamental Research Funds for the Central University [2042015kf0043]
- National Natural Science Foundation of China [51502207]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1210792] Funding Source: National Science Foundation
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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 1 V 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/H-2 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. (C) 2016 Elsevier Ltd. All rights reserved.
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