The sintering temperature effect on electrochemical properties of Ce0.8Sm0.05Ca0.15O2-δ (SCDC)-La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) heterostructure pellet

Abstract

Recently, semiconductor-ionic materials (SIMs) have emerged as new functional materials, which possessed high ionic conductivity with successful applications as the electrolyte in advanced low-temperature solid oxide fuel cells (LT-SOFCs). In order to reveal the ion-conducting mechanism in SIM, a typical SIM pellet consisted of semiconductor La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) and ionic conductor Sm and Ca Co-doped ceria Ce 0.8 Sm 0.05 Ca 0.15 O 2-δ (SCDC) are suffered from sintering at different temperatures. It has been found that the performance of LSCF-SCDC electrolyte fuel cell decreases with the sintering temperature, the cell assembled from LSCF-SCDC pellet sintered at 600 °C exhibits a peak power density ( P max ) of 543 mW/cm 2 at 550 °C and also excellent performance of 312 mW/cm 2 even at LT (500 °C). On the contrary, devices based on 1000 °C pellet presented a poor P max of 106 mW/cm 2 . The performance difference may result from the diverse ionic conductivity of SIM pellet through different temperatures sintering. The high-temperature sintering could severely destroy the interface between SCDC and LSCF, which provide fast transport pathways for oxygen ions conduction. Such phenomenon provides direct and strong evidence for the interfacial conduction in LSCF-SCDC SIMs. Electronic supplementary material The online version of this article (10.1186/s11671-019-2979-x) contains supplementary material, which is available to authorized users.

Application of a Triple-Conducting Heterostructure Electrolyte of Ba0.5Sr0.5Co0.1Fe0.7Zr0.1Y0.1O3−δ and Ca0.04Ce0.80Sm0.16O2−δ in a High-Performance Low-Temperature Solid Oxide Fuel Cell

“…Thus, considering these issues associated with pure proton-conducting perovskite oxide materials, alternative routes are needed. For instance, the semiconducting nature of perovskite oxides and their formation of a heterostructure with an ionic conductor to tune high ionic conduction is of great significance in terms of enhanced power output. ,,, This strategy has been applied repeatedly to probe exceptional electrolyte membranes for LT-SOFCs in recent years.…”

Novel n–i CeO2/a-Al2O3 Heterostructure Electrolyte Derived from the Insulator a-Al2O3 for Fuel Cells

“…In recent years, new designs for developing alternative electrolytes have been proposed, which overcome the traditional concepts of improving conductivity by doping ionic conductors and alleviate the challenges related to the application of LT-SOFCs. , One of the methods is the use of semiconductors and ionic conductors to construct composite electrolytes, , such as La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3‑δ -Ce 0.8 Sm 0.05 Ca 0.15 O 2−δ (SCDC), LaFe 0.65 Ti 0.35 O 3−δ -SCDC, and In 2 O 3 –La/Pr-Doped Ceria . Using this method, an ion conduction highway was built at the interface of two-phase materials, and thus, these composite samples attained high ionic conductivity and excellent power output.…”

Systematic Analysis on the Effect of Sintering Temperature for Optimized Performance of Li0.15Ni0.45Zn0.4O2-Gd0.2Ce0.8O2-Li2CO3-Na2CO3-K2CO3 Based 3D Printed Single-Layer Ceramic Fuel Cell

“…Ionic conductors used in single-layer cells are mostly based on pure doped ceria, and composites of doped ceria and alkali carbonates. The electrode materials used in single-layer cells include LiCoO 2 -LiFeO 2 [ 10 ], Ni 0.8 Co 0.15 Al 0.05 LiO 2 [ 11 ], La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ [ 12 ], CuFe 2 O 4 [ 13 , 14 ], Li 0.15 Ni 0.25 Cu 0.1 Zn 0.2 Fe 0.3 O x [ 15 ], Li 0.3 Ni 0.6 Cu 0.07 Sr 0.03 O 2-δ [ 16 ], Sr 2 Fe 1.5 Mo 0.5 O 6-δ [ 17 ], Li 0.15 Ni 0.45 Zn 0.4 O 2 [ 18 ], etc. In addition, proton conductors (BaCe 0.7 Zr 0.1 Y 0.2 O 3-δ ) have been used in single-layer cells [ 19 ].…”