Pyrochlore LaSrSn2O7 nanoparticles anchored on carbon nanofibers as bifunctional catalysts for an efficient Li-O2 battery

卷:66

Article

关键词: GRAPHENE OXIDE SHEETS;    CATHODE CATALYST;    HIGHLY EFFICIENT;    OXYGEN EVOLUTION;    ELECTROCATALYST;    PERFORMANCE;    NANOWIRES;    COMPOSITE;    LA2SN2O7;    FABRICATION;   

DOI  :  10.1016/j.est.2023.107329

来源: SCIE

【 摘 要 】

The slow reaction kinetics of oxygen reduction reaction for Li2O2 formation and oxygen evolution reaction for Li2O2 decomposition with poor electrocatalytic activities have been a problem to be solved for the commer-cialization of lithium-oxygen (Li-O2) batteries. Bifunctional catalysts composed with pyrochlore LaSrSn2O7 nanoparticles (LSSO NPs) and one-dimensional (1D) carbon nanofibers (NFs) were prepared and their catalytic performances were investigated for Li-O2 batteries. As-obtained 1D carbon@LaSrSn2O7 (C@LSSO) NFs com-posites in Li-O2 battery cathode delivered excellent initial specific capacity (ca. 8067.3 mAh g-1). In addition, decent cycle durability of the C@LSSO cathode was accomplished over 54 cycles with a low overpotential gap of 1.01 V at a rate of 200 mA g-1 with a specific capacity limit of 500 mAh g-1, in comparison to the LSSO NPs and ketjen black carbon. The enhanced properties suggest that these composite structures of pyrochlore LSSO NPs with 1D carbon NFs backbones could be a prospective bifunctional catalyst in the development of the high-performance Li-O2 battery.

【 授权许可】

Free