Abstract
The reductibility of B-site elements in perovskite(ABO3)structures is one of the paramount factors that promote the in-situ exsolution of metallic nanocatalysts,and the phase transition of the support to a more stable structure under solid oxide cell(SOC)fuel electrode operating conditions.Herein,we develop a highly catalytically active and durable perovskite-based fuel electrode material-La_(0.6)Sr_(0.4)Co_(0.15)Fe_(0.8)Pd_(0.05)O_(3-δ)(LSCFP)-for reversible SOCs.The LSCFP material under the fuel electrode condition is fully transformed into a stable Ruddlesden-Popper phase decorated by bimetallic Co-Fe nanocatalysts.The SOC with LSCFP fuel electrode yielded outstanding performances in both fuel cell(2.00 W cm~(-2))and electrolysis cell(2.23 A/cm~2 at 1.3 V)modes at 850 ℃,with remarkable reversible-cyclic stability.These results clearly demonstrate that the novel LSCFP capable of concurrent phase transition and bimetallic exsolution in the reducing condition is a highly prospective candidate as a bifunctional fuel electrode for reversible SOCs.
NSTL