Basic properties of proton conductor BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_3‐δ (BZCYYb) material

Abstract

Proton conductor BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) have a wide range of applications in solid oxide fuel cell due to its resistance to carbon deposition and good protonic conductivity. In this work, several basic properties of BZCYYb perovskite were studied: Structural phase transitions have been investigated with combination of differential scanning calorimeter, dilatometry, and high-temperature X-ray diffraction (XRD). Water absorption ability of BZCYYb in the temperature range of 600°C to 800°C was measured by thermogravimetry (TG) in a certain concentration of water vapor; the results showed the best absorption ability of 4.2% weight gain at 600°C, corresponding to a water adsorption of 0.63 mmol/m 2 . Oxygen stoichiometry of BZCYYb from room temperature to 800°C increased from 0.1296 to 0.386 in air. Besides, we compared the conductivity in different atmospheres (dry and humid N 2 -H 2 [5%] and dry and humid air), which showed the highest total conductivity in humid air and a lower conductivity activation energy in a reducing atmosphere. Finally, CO 2 poisoning process of BZCYYb was analyzed by XRD and TG. Compared with the case of pure CO 2 , lower critical CO 2 poisoning temperature and more BaCO 3 were found in CO 2 -H 2 O, indicating the addition of water could promote the reaction.

Carbonate-superstructured solid fuel cells with hydrocarbon fuels

“…S7 B ). Similar phase changes of Ni-BZCYYb in the presence of CO 2 and H 2 O were also observed for conventional SOFCs with dense electrolytes ( 33 , 34 ). However, this crystal structure change did not cause further degradation of cell performance with increasing time.…”

BaCo0.4Fe0.4Zr0.1Y0.1O3−σ Cathode Performance for Proton Conducting Solid Oxide Fuel Cells with BaZr0.8−xCexY0.1Yb0.1O3−δ Electrolytes

“…As expected, all three electrolytes have the same tendency to lose oxygen when heated up; the higher the Ce concentration, the more oxygen loss especially at high temperatures of ∼800 °C, and the data is close to literature. 20 Microstructure of symmetrical cells.-The microstructure of the three proton conducting electrolytes (Ce-rich, ZrCe-bal and Zr-rich) after sintering is shown in Figs. 4a-4c.…”

“…Such an assumption was supported by XRD Rietveld refinement and was also consistent with iodometric titration measurement in the literature. 20 Symmetrical cells fabrication and microstructure examination.-For pellet fabrication, all electrolytes were sintered following the same process. Using BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3−δ (Ce-rich) electrolyte as an example, the Ce-rich powder was mixed with 0.5 wt% NiO as the sintering aid by hand grounding.…”

High-Entropy Perovskite Electrolyte for Protonic Ceramic Fuel Cells Operating below 600 °C

“…2751) at RT to the rhombic phase at 700 °C. 42 The lattice parameters of BSZCYYbD and BZCY materials at room temperature and 700 °C were calculated and are listed in Table S8 in the Supporting Information. We gain insight into the nature of stability of BSZCYYbD by analysis of combining the XRD, HRTEM, and thermal expansion analyses: the cubicphase BSZCYYbD with a more stable crystal structure is responsible for its excellent chemical and the structural stability of the BSZCYYbD HEPO.…”