Pulsed electrolysis of carbon dioxide by large-scale solid oxide electrolytic cells for intermittent renewable energy storage

Anqi Wu, Chaolei Li, Beibei Han, Wu Liu, Yang Zhang, Svenja Hanson, Wanbing Guan, Subhash C. Singhal

Research output: Journal PublicationArticlepeer-review

1 Citation (Scopus)

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 languageEnglish
JournalCarbon Energy
DOIs
Publication statusAccepted/In press - 2022

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

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