@article{XU2022, 
author = {Yangsen XU and Shoufu YU and Yanru YIN and Lei BI},
title = {Taking advantage of Li-evaporation in LiCoO2 as cathode for proton-conducting solid oxide fuel cells},
year = {2022},
journal = {Journal of Advanced Ceramics},
volume = {11},
number = {12},
pages = {1849-1859},
keywords = {composite, cathode, solid oxide fuel cells (SOFCs), proton conductor},
url = {https://www.sciopen.com/article/10.1007/s40145-022-0651-x},
doi = {10.1007/s40145-022-0651-x},
abstract = {LiCoO2, a widely used electrode material for Li-ion batteries, was found to be suitable as a cathode material for proton-conducting solid oxide fuel cells (H-SOFCs). Although the evaporation of Li in LiCoO2 was detrimental to the Li-ion battery performance, the Li-evaporation was found to be beneficial for the H-SOFCs. The partial evaporation of Li in the LiCoO2 material preparation procedure led to the in-situ formation of the LiCoO2+Co3O4 composite. Compared to the cell using the pure phase LiCoO2 cathode that only generated moderate fuel cell performance, the H-SOFCs using the LiCoO2+Co3O4 cathode showed a high fuel cell performance of 1160 mW·cm–2 at 700 ℃, suggesting that the formation of Co3O4 was critical for enhancing the performance of the LiCoO2 cathode. The first-principles calculation gave insights into the performance improvements, indicating that the in-situ formation of Co3O4 due to the Li-evaporation in LiCoO2 could dramatically decrease the formation energy of oxygen vacancies that is essential for the high cathode performance. The evaporation of Li in LiCoO2, which is regarded as a drawback for the Li-ion batteries, is demonstrated to be advantageous for the H-SOFCs, offering new selections of cathode candidates for the H-SOFCs.}
}