Abstract
CO2 electrolysis with solid oxide electrolytic cells (SOECs) using intermittently available renewable energy has potential applications for carbon neutrality and energy storage. In this study, a pulsed current strategy is used to replicate intermittent energy availability, and the stability and conversion rate of the cyclic operation by a large-scale flat-tube SOEC are studied. One hundred cycles under pulsed current ranging from −100 to −300 mA/cm2 with a total operating time of about 800 h were carried out. The results show that after 100 cycles, the cell voltage attenuates by 0.041%/cycle in the high current stage of −300 mA/cm2, indicating that the lifetime of the cell can reach up to about 500 cycles. The total CO2 conversion rate reached 52%, which is close to the theoretical value of 54.3% at −300 mA/cm2, and the calculated efficiency approached 98.2%, assuming heat recycling. This study illustrates the significant advantages of SOEC in efficient electrochemical energy conversion, carbon emission mitigation, and seasonal energy storage.
Original language | English |
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Article number | e262 |
Journal | Carbon Energy |
Volume | 5 |
Issue number | 4 |
DOIs | |
Publication status | Published - Apr 2023 |
Keywords
- carbon dioxide
- cyclic electrolysis
- pulse current
- solid oxide electrolytic cells
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science (miscellaneous)
- Energy (miscellaneous)
- Materials Chemistry