New, Efficient, and Reliable Air Electrode Material for Proton-Conducting Reversible Solid Oxide Cells

Daoming Huan, Nai Shi, Lu Zhang, Wenzhou Tan, Yun Xie, Wanhua Wang, Changrong Xia, Ranran Peng, Yalin Lu

研究成果: ジャーナルへの寄稿学術誌査読

84 被引用数 (Scopus)

抄録

Driven by the demand to minimize fluctuation in common renewable energies, reversible solid oxide cells (RSOCs) have drawn increasing attention for they can operate either as fuel cells to produce electricity or as electrolysis cells to store electricity. Unfortunately, development of proton-conducting RSOCs (P-RSOCs) faces a major challenge of poor reliability because of the high content of steam involved in air electrode reactions, which could seriously decay the lifetime of air electrode materials. In this work, a very stable and efficient air electrode, SrEu2Fe1.8Co0.2O7-δ (SEFC) with layer structure, is designed and deployed in P-RSOCs. X-ray diffraction analysis and High-angle annular dark-filed scanning transmission electron microscopy images of SEFC reveal that Sr atoms occupy the center of perovskite slabs, whereas Eu atoms arrange orderly in the rock-salt layer. Such a special structure of SEFC largely depresses its Lewis basicity and therefore its reactivity with steam. Applying the SEFC air electrode, our button switches smoothly between both fuel cell and electrolysis cell (EC) modes with no obvious degradation over a 135 h long-term test under wet H2 (∼3% H2O) and 10% H2O-air atmospheres. A record of over 230 h is achieved in the long-term stability test in the EC mode, doubling the longest test that had been previously reported. Besides good stability, SEFC demonstrates great catalytic activity toward air electrode reactions when compared with traditional La0.6Sr0.4Co0.2Fe0.8O3-δ air electrodes. This research highlights the potential of stable and efficient P-RSOCs as an important part in a sustainable new energy power system.

本文言語英語
ページ(範囲)1761-1770
ページ数10
ジャーナルACS Applied Materials and Interfaces
10
2
DOI
出版ステータス出版済み - 1月 17 2018
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)

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