BaCe<sub>0.85-x</sub>Zr<sub>x</sub>Sm<sub>0.15</sub>O<sub>3-δ</sub>(0.01 < x < 0.3) (BCZS): Effect of Zr Content in BCZS on Chemical Stability in CO<sub>2</sub>and H<sub>2</sub>O Vapor, and Proton Conductivity
Bibliographic record
Abstract
In this paper, we report the chemical stability of a highly proton conducting Sm+Zr–codoped BaCe0.85-xZrxSm0.15O3-δ (BCZS) (0.01 < x < 0.3) in H2O vapor and CO2, and their electrical conductivity in air, N2 + 3% H2O, H2 + 3% H2O and N2 + 3% D2O. All the prepared BCZS was found to be structurally stable against reaction with pure CO2 at 400°C for 24 h, showing a positive role of Zr in providing chemical stability. However, at 600°C for 24 h, BCZS (0 < x < 0.2) showed the formation of BaCO3, while x = 0.3 remained stable at 20% CO2 in N2. Upon exposure to H2O vapor at 90°C, Ba(OH)2.xH2O formation was observed for all the investigated BCZS whereas at 600°C all were found to be chemically stable. A maximum conductivity of 5 × 10−3 Scm−1 is obtained for x = 0.3 member, which is about 40% of its Zr-free parent compound BaCe0.85Sm0.15O3-δ (BCS). Current work shows that despite the drop in conductivity, Zr doping in BCS provides stability under pure CO2, especially considering the goal of decreasing operating temperature of solid oxide fuel cells (SOFCs) below 500°C.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.009 | 0.003 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.004 | 0.002 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.001 | 0.003 |
| Scholarly communication | 0.000 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.005 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".