Open AccessPulsed electrolysis of carbon dioxide by large‐scale solid oxide electrolytic cells for intermittent renewable energy storage
Author(s) -
Wu Anqi,
Li Chaolei,
Han Beibei,
Liu Wu,
Zhang Yang,
Hanson Svenja,
Guan Wanbing,
Singhal Subhash C.
Publication year - 2023
Publication title -
carbon energy
Language(s) - English
Resource type - Journals
ISSN - 2637-9368
DOI - 10.1002/cey2.262
Subject(s) - electrolytic cell , energy storage , electrolysis , renewable energy , electrolyte , materials science , environmental science , oxide , carbon dioxide , chemical engineering , chemistry , electrode , thermodynamics , electrical engineering , metallurgy , physics , engineering , power (physics) , organic chemistry
CO 2 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/cm 2 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/cm 2 , indicating that the lifetime of the cell can reach up to about 500 cycles. The total CO 2 conversion rate reached 52%, which is close to the theoretical value of 54.3% at −300 mA/cm 2 , 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.