Doping effects on complex perovskite Ba3Ca1.18Nb1.82O9−δ intermediate temperature proton conductor

Two-Step Reactive Aid Sintering of BaZr0.8Y0.2O3−δ Proton-Conducting Ceramics

“…24,25 For the conventional SSR method, a stoichiometric amount of BaCO 3 (Alfa Aesar, 99.8%), ZrO 2 (Alfa Aesar, 99.7%) and Y 2 O 3 (Alfa Aesar, 99.9%) were mixed together by ball-milling in ethanol for 24 h. After drying, the obtained powders were pressed into pellets, followed by calcining at 1100°C for 10 h in air with a heating rate of 3°C min À1 . The pellets were then ground into powders which were subsequently mixed with 5 wt.% polyvinyl alcohol (PVA) binder and uniaxially pressed into pellets under a pressure of 400 MPa.…”

Two-step co-sintering method to fabricate anode-supported Ba3Ca1.18Nb1.82O9−δ proton-conducting solid oxide fuel cells

“…Powder samples of Ba 3 Ca 1.18 Nb 1.82 O 9Àd (BCN) electrolyte were prepared by conventional solid-state reaction method as reported elsewhere [15,23]. Pure BCN18 powder was finally obtained after calcination at 1,200 C for 5 h in air with a heating rate of 3 C min À1 .…”

“…Among the different novel materials explored, complex-perovskite structured Ba 3 Ca 1.18 Nb 1.82 O 9Àd (BCN18) has been reported to possess acceptable conductivity and excellent chemical stability towards CO 2 and H 2 O at the typical SOFC operating conditions [13,14]. In addition, it has been recently discovered that dopants in the Nb sites can improve proton conductivity without sacrificing the chemical stability [15]. Unfortunately, very few reports have explored the use of BCN18 materials in SOFC applications due to the low sinterability of the BCN18 electrolyte as well as the lack of compatible electrode materials [14,15].…”

“…In addition, it has been recently discovered that dopants in the Nb sites can improve proton conductivity without sacrificing the chemical stability [15]. Unfortunately, very few reports have explored the use of BCN18 materials in SOFC applications due to the low sinterability of the BCN18 electrolyte as well as the lack of compatible electrode materials [14,15]. A maximum power output of 48 mW cm À2 at 700 C has been reported for SOFCs using BCN18 electrolyte membrane prepared by an in-situ method (to lower the sintering temperature to 1,400 C) [16].…”

Electrical Properties of Ba3Ca1.18Nb1.82O9-δ Proton-Conducting Electrolyte Prepared by a Combustion Method

“…Fuel cells with the BCN18 electrolyte show a power output even larger than that of fuel cell using BaCeO 3 -based electrolytes (8). BCN18 also has a great advantage over doped BaCeO 3 since it shows good chemical stability in CO 2 and H 2 O containing environment, making it very interesting as a potential electrolyte material for proton-conducting SOFCs (9,10). However, although the good chemical stability of BCN18 is well recognized, the conductivity results for BCN18 are scattered in the different studies, with differences reaching even two orders of magnitude (11).…”