In Situ Fabrication of a Supported Ba₃Ca_1.18Nb_1.82O_9−δ Membrane Electrolyte for a Proton‐Conducting SOFC

Abstract

A thin Ba3Ca1.18Nb1.82O9−δ (BCN18) membrane electrolyte was prepared by a novel and facile method on a NiO–BCN18 anode substrate. The interesting aspect of the method was the adoption of a in situ reaction of BaCO3, CaCO3, and Nb2O5 on the anode substrate to prepare a dense BCN18 membrane. The BCN18 membrane obtained, which was about 15 μm in thickness and showed high chemical stability against H2O and CO2, attained a high density after sintering at 1400°C. The elemental composition of the BCN18 membrane prepared was identified by energy‐dispersive X‐ray spectroscopy analysis. With La0.7Sr0.3FeO3−σ (LSF) as the cathode, the fuel cell performance with the structure of Ni–BCN18/BCN18/LSF was studied.

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

“…3(c) also suggest that trace amount of BaO and CaO dissolved into NiO. NiO-BCN18jBCN18jBCFN fuel cells were fabricated and showed a fairly low power output of 46 mW cm À2 at 700 C, similar to the reported data [16], mainly due to the relatively large ohmic resistance (shown in Fig. 4).…”

“…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]. High sintering temperature may result in the evaporation of cations in the BCN18 electrolytes as well as the densification of the anode and Ni-coarsening, deteriorating the cell electrochemical performance.…”

A mixed electronic and protonic conducting hydrogen separation membrane with asymmetric structure

“…Although some high temperature proton conductor (e.g. LaNbO 4 [18] and BaCa 1.18 Nb 1.82 O 9 [19], Ln 6 WO 12 [20]), have been investigated as SOFC electrolyte or hydrogen separation membrane, the low conductivity blocks their further development.…”

Influence of anode pore forming additives on the densification of supported BaCe0.7Ta0.1Y0.2O3−δ electrolyte membranes based on a solid state reaction

“…In recent studies, an in situ solid state reaction method has been successfully used to prepare dense ceramic membranes on porous substrates. 6,[10][11][12][13] However, ceramic powders with high sintering activity (powders prepared through a wet chemical route 6 or nano-sized ceramic powders 12 ) are usually required to prepare the anode substrate, in order to maintain high sintering activity for the substrate. This can still hinder the commercialization of proton-conducting SOFCs because of the relatively high processing costs.…”