リバーシブル・プロトニック・セラミック・セル用高エントロピー共ベース酸素電極
Jianxiong Wang1,2, Zuo Li3, Wei Chen1
1School of Chemical and Environmental Engineering, China University of Mining & Technology-Beijing, Beijing, 100083, China.
Small (Weinheim an der Bergstrasse, Germany)
|August 23, 2025
まとめ
新しい高エントロピーのペロブスキート,特にPr0.2Ba0.2Sr0.2La0.2Nd0.2CoO3-δ (PBSLNC) は,可逆性プロトンセラミックセル (R-PCC) の酸素電極として有望である. これらの材料は,エネルギー変換および貯蔵アプリケーションの優れた電気化学性能と安定性を示しています.
科学分野:
- 材料科学
- 電気化学
- エネルギー変換と貯蔵
背景:
- リバーシブル・プロトン・セラミック・セル (R-PCC) は,エネルギー変換と貯蔵に不可欠です.
- 有効な酸素電極は,酸素還元/進化反応 (ORR/OER) と互換性のある熱膨張係数 (TEC) の高い触媒活性を必要とするため,R-PCCの性能に不可欠です.
研究 の 目的:
- 新しい高エントロピーペロブスキート Pr0.2Ba0.2Sr0.2La0.2Nd0.2MeO3-δ (Me = Co, Fe, Mn) をR-PCCの潜在的な酸素電極として調査する.
- これらの新しい材料の電気化学的性能,熱機械的互換性,および安定性を評価する.
主な方法:
- 高エントロピーのペロブスキートの合成と特徴付け.
- 燃料電池 (FC) と電解 (EC) モードでのTECと電気化学性能の評価
- 新しい電極でR-PCCを様々な動作条件 (H2O電解,CO2-H2O共電解,可逆動作) で試験する.
主要な成果:
- Pr0.2Ba0.2Sr0.2La0.2Nd0.2CoO3-δ (PBSLNC) は12.02 × 10-6 K-1のTECを示し,BaCe0.7Zr0.1Y0.1Yb0.1O3-δ (BCYZYb) の電解質と互換性がありました.
- PBSLNCを使ったR-PCCは,0.87Wcm−2のピーク電力密度 (FCモード) と,H−2O電解 (−1.39Acm−2で650°C) とCO−H−2O共電解 (−1.45Acm−2で700°C) で高い電流密度を達成した.
- 150時間 (FC/ECモード),96時間 (CO2−H2共電解),100時間 (可逆モード) の例外的な安定性が実証された.
結論:
- 新しい高エントロピーペロブスキート,特にPBSLNCは,R-PCCのための効果的な酸素電極です.
- PBSLNCは,高度なR-PCCのための低TECの効率的なCO基酸化物触媒の設計のための有望な戦略を提供します.
- この研究は,エネルギーアプリケーションのための高性能で安定したR-PCCの開発を進めています.
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