In situ formation of a 3D core-shell and triple-conducting oxygen reduction reaction electrode for proton-conducting SOFCs
|dc.identifier.citation||Zhang, Z. and Wang, J. and Chen, Y. and Tan, S. and Shao, Z. and Chen, D. 2018. In situ formation of a 3D core-shell and triple-conducting oxygen reduction reaction electrode for proton-conducting SOFCs. Journal of Power Sources. 385: pp. 76-83.|
BaZr x Ce y Y 1-x-y O 3-Î´ are recognized proton-conducting electrolyte materials for proton-conducting solid oxide fuel cells (H + -SOFCs) below 650 Â°C. Here Co cations are incorporated into the BaZr 0.4 Ce 0.4 Y 0.2 O 3-Î´ (BZCY) scaffold to generate a 3D core-shell and triple-conducting (H + /O 2âˆ’ /e âˆ’ ) electrode in situ via infiltrating and reactive sintering. The core is the bulk BZCY scaffold, while the shell is composed of the cubic Ba(Zr 0.4 Ce 0.4 Y 0.2 ) 1-x Co x O 3-Î´ , cubic spinel Co 3 O 4 and cubic fluorite (Ce, Zr, Y)O 2 . The obtained electrode exhibits an excellent compatibility with the BZCY electrolyte, and performs well in yielding a low and stable polarization resistance for oxygen reduction reaction for intermediate-temperature H + -SOFCs. In particular, it achieves polarization resistances as low as 0.094 and 0.198 Î© cm 2 at 650 and 600 Â°C in wet air (3% H 2 O) when the sintering temperature for the electrode is 900 Â°C. In addition, a symmetrical cell also exhibits operation stability of 70 h at 650 Â°C. Furthermore, a fuel cell assembled with the 3D core-shell and triple-conducting electrode delivers a peak power density of âˆ¼330 mW cm âˆ’2 at 650 Â°C. The substantially improved electrochemical performance and high stability are ascribed to the unique core-shell structure and the formation of Ba(Zr 0.4 Ce 0.4 Y 0.2 ) 1-x Co x O 3-Î´ in the shell.
|dc.title||In situ formation of a 3D core-shell and triple-conducting oxygen reduction reaction electrode for proton-conducting SOFCs|
|dcterms.source.title||Journal of Power Sources|
|curtin.department||WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)|
|curtin.accessStatus||Fulltext not available|