Cobalt-free layered perovskite oxides Sm 1-x La x BaFe 2 O 5+δ (x=0-0.5) (SLBFx, for short) have been systematically investigated to evaluate the feasibility as cathode for intermediate temperature SOFC (IT-SOFCs). SLBFx powders with orthorhombic structure synthesized by EDTA-glycine combustion method are compatible with LSGM and SDC electrolytes below 1250 °C. The electrical conductivities of the SLBFx samples significantly increase with the substitution of La for Sm, with the highest conductivity of 37.8 S cm −1 obtained for the SLBF0.5 sample at 600 °C. Among the La-doped SmBaFe 2 O 5+δ series samples, SLBF0.2 has the lowest thermal expansion coefficient (TEC) and the minimum electrode polarization resistance, with a value of 16.51×10 -6 K -1 in 50-800 °C range and 0.24 Ω•cm 2 at 750 °C respectively. The anode supported single cell with SLBF0.2 as cathode can generate a maximum power density of 558 mW cm −2 at 800 °C in humidified H 2 . All things considered, SLBFx materials are good candidates for cobalt-free cathodes in IT-SOFCs.
Novel CuO hybrid nanostructures composed of one-dimensional (ID) porous carbon nanofibers and two-dimensional (2D) graphene nanosheets have been fabricated with the help of electrospinning technique, which is denoted as CuO@PCNF/GN. The microstructure and morphology of the CuO@PCNF/GN were investigated by X-ray diffraction and transmission electron microscopy. The electrochemical performances of the as-prepared materials as a novel bind-free anode for lithium ion battery (LIB) were investigated. The CuO@PCNF/GN electrode exhibited high discharge capacity of 665 mAh g−1 after 60 cycles at the current density of 100 mA g−1. Even at 800 mA g−1, the discharge capacity of the anode could still maintained at 443 mAh g−1. The excellent electrochemical properties of CuO are greatly related to the unique 3D interconnected structure of continuous PCNF and GN, which enables efficient electron/ion transport and migrate the volume change of active CuO materials.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.