Fabrication of multi-layered structures for proton conducting ceramic cells

Abstract

We show manufacturing of 25 cm2 BZCY half-cells by tape-casting of assemblies with electrolyte thickness 10–20 μm. BaY2NiO5 transient liquid phase formation is analysed and proton conductivity with values of σ = 0.003 S cm−1 at 600 °C is shown.

Development of Electrode-Supported Proton Conducting Solid Oxide Cells and their Evaluation as Electrochemical Hydrogen Pumps

“…For example, the number of pores/defects is practically eliminated after 10 h of sintering ( Figure S8 ). Moreover, the grain size is increased from 0.46 to 1.8 μm as the sintering time is increased from 1 to 10 h ( Figure 6 ), as also observed in ref ( 40 ). Based on the results obtained for varying sintering temperature and time, we selected a sintering temperature and time of 1500 °C and 10 h, respectively, for the fabrication of our cells, as the electrolyte was found to be completely dense (to prevent gas crossover), and the grain size was large, which essentially reduces the blocking effect.…”

“…The sinterability and microstructure of the membrane/electrode depend upon the sintering temperature and time, as reported previously. 40 , 42 We tested three different coating techniques: spray, spin, and dip coating on our presintered supports ( Figure S5 ). Membrane coatings deposited by spraying result in macrocracks and uneven layers, possibly due to the fast evaporation of volatiles and irregular deposition.…”

“…However, other inhomogeneities within the membrane can also be generated by the formation of intermediate phases, e.g., BaY 2 NiO 5 . 40 In addition, the associated elevated sintering temperatures and longer soaking times turn out to be detrimental. To avoid material decomposition, researchers have used sintering aids such as NiO, ZnO, Co 2 O 3 , and CuO 38 , 44 − 46 to promote densification and grain growth at lower temperatures.…”

Tailored and Improved Protonic Conductivity through Ba(ZxCe10−x)0.08Y0.2O3−δ Ceramics Perovskites Type Oxides for Electrochemical Devices

“…BaZr 0.16 Ce 0.64 Y 0.2 O 2.9 and BaZr 0.44 Ce 0.36 Y 0.2 O 2.9 electrolyte compositions were integrated into cathode‐supported steam electrolysis cells with BLC55 as the anode and Ni as the cathode catalyst. Both cells were fabricated using a well‐established low‐cost, sequential tape casting processing route [52–54] …”

“…Both cells were fabricated using a well-established low-cost, sequential tape casting processing route. [52][53][54] Figure 7(a) presents typical open-circuit voltage (OCV) profiles obtained from both cells during the cathode reduction with varying H 2 concentrations. As observed, approximately four hours are sufficient to obtain OCV values (1.03 and 1.12 V, respectively), close to those calculated using the Nernst equation, thus verifying that both electrolyte layers are dense enough to ensure sufficient gas tightness.…”