Abstract
BaCe0.9Yb0.1O3−α was prepared via the sol-gel method using zirconium nitrate, ytterbium trioxide, cerium nitrate and barium acetate as raw materials. Subsequently, it reacted with the binary NaCl~KCl salt to obtain BaCe0.9Yb0.1O3−α-NaCl~KCl composite electrolyte. The structure, morphology, conductivity and fuel cell performance of the obtained samples were investigated. Scanning electron microscope (SEM) images showed that BaCe0.9Yb0.1O3−α and NaCl~KCl combined with each other to form a homogeneous 3-D reticulated structure. The highest power density and conductivity of BaCe0.9Yb0.1O3−α-NaCl~KCl was 393 mW·cm−2 and 3.0 × 10−1 S·cm−1 at 700 °C, respectively.
Highlights
Fuel cells have many merits, such as diversity of fuel options, being environmentally friendly and having high energy efficiency [1,2,3,4,5,6,7,8]
BaCe0.9 Yb0.1 O3−α was prepared via the sol-gel method and the composite electrolyte of BaCe0.9 Yb0.1 O3−α -NaCl~KCl was synthesized
BaCe0.9 Yb0.1 O3−α was prepared via the sol-gel method using zirconium nitrate, ytterbium trioxide, cerium nitrate and barium acetate as the raw materials
Summary
Fuel cells have many merits, such as diversity of fuel options, being environmentally friendly and having high energy efficiency [1,2,3,4,5,6,7,8]. Owing to the concentrations of oxygen vacancies and point defect pairs, two opposing factors, the optimum doping level of BaCeO3 and SrCeO3 -based electrolytes is usually 10% [17]. Among these doped metal cations, Y3+ and Yb3+ doped BaCeO3 or SrCeO3 have relatively high conductivities [17,18]. The synthetic methods of BaCeO3 and SrCeO3 -based electrolytes are solid-state reactions, citrate-nitrate combustions, microemulsions and sol-gel methods [19,20]. The solid-state reaction method requires a high temperature (1550–1700 ◦ C) and the particle size of the product is larger. The sintering temperature can be reduced to 200–300 ◦ C
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