Tailoring cations in a perovskite cathode for proton-conducting solid oxide fuel cells with high performance

Abstract

Tailoring cathode materials with cations enables an improved hydration ability and proton migration, leading to a high fuel cell performance.

Understanding the effect of water transport on the thermal expansion properties of the perovskites BaFe0.6Co0.3Nb0.1O3−δ and BaCo0.7Yb0.2Bi0.1O3−δ

“…Studies that consider the effect of moisture in the synthesis and in the testing process are rare. As reported by many authors [13,15,17,35,[39][40][41], water is incorporated into oxygen vacancy sites in perovskite systems. Despite recent progress, the understanding of the interaction of the transition metal-containing perovskite electrodes with moisture, and their phase stability (at SOC conditions) is lacking.…”

A New High‐Performance Proton‐Conducting Electrolyte for Next‐Generation Solid Oxide Fuel Cells

“…A commonly used cell fabrication method is the typical dry‐pressing anode substrate preparation, where the anode is fired alone or copressed and cofired with the electrolyte layer, followed by painting of the cathode slurry onto the electrolyte layer. [ 64–66 ] Other cell fabrication methods have also been applied, such as tape casting, gel casting, phase inversion for anode preparation, spin coating, solution coating, pressurized spray coating of the electrolyte onto the anode layer, and screen printing or painting of the cathode onto the electrolyte layer. In this report, we used a typical dry‐pressing method to prepare the anode substrate, which revealed the greatest performance at 700 °C compared with the reported values based on dry‐pressed anodes.…”

A Zn-Doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite Cathode with Enhanced ORR Catalytic Activity for SOFCs

“…Nowadays, reducing the operating temperature of SOFCS to the intermediate-to-low temperature range (400-750 • C) is one of the most significant problems to be solved in order to promote their commercial applications [6][7][8]. Such a reduction can bring about many advantages, such as decreased material degradation, improved structural stability, ease of sealing, longer service life and much lower operational and system costs [9,10]. However, the lower operating temperature would cause a rapid increment of cathode polarization resistance and resultant sluggish cathode catalytic kinetics for oxygen reduction reaction (ORR), as is a major obstacle to intermediate-to-low temperature SOFC performance improvement [8][9][10].…”

“…Such a reduction can bring about many advantages, such as decreased material degradation, improved structural stability, ease of sealing, longer service life and much lower operational and system costs [9,10]. However, the lower operating temperature would cause a rapid increment of cathode polarization resistance and resultant sluggish cathode catalytic kinetics for oxygen reduction reaction (ORR), as is a major obstacle to intermediate-to-low temperature SOFC performance improvement [8][9][10]. Therefore, it is vital to develop cathode materials with excellent ORR electrocatalytic activity and stability for application at reduced temperatures.…”

“…Therefore, it is vital to develop cathode materials with excellent ORR electrocatalytic activity and stability for application at reduced temperatures. Many mixed ionic-electronic conductors (MIECs), including the perovskite structures La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-δ (LSCF) [11], Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) [1,10], Sm 0.5 Sr 0.5 CoO 3-δ (SSC) [12] and layered perovskite structure LnBaCo 2 O 5+δ [13] have been explored as cathode materials for intermediate-to-low temperature SOFCs. The newly developed perovskite BaCo 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3-δ and SrCo 0.8 Nb 0.1 Ta 0.1 O 3-δ cathodes also been proved to have excellent ORR activity at intermediate-to-low temperatures [9,14].…”