Highly active and robust biomimetic ceramic catalyst for oxygen reduction reaction: Inspired by plant leaves

作者：Pang, Shengli^*; Long, Chao; Tang, Xin; Fang, Ting; Ke, Lingfeng; Yang, Gongmei; Song, Yifan; Chen, Chonglin^*

来源：Ceramics International, 2023, 49(12): 20273-20280.

DOI：10.1016/j.ceramint.2023.03.150

• Solid oxide fuel cells
• Perovskite oxide
• Surface chemistry
• Electrocatalysis
• Oxygen reduction reaction

Structural instability under working conditions is critical issue that restricts applications of perovskite O2 cat-alysts in the field of solid oxide fuel cells. Inspired by plant leaves, a biomimetic ceramic catalyst with PrBaCo2O5+delta 'mesophyll' and Gd0.1Ce0.9O1.95 'epidermis' and 'vein' was successfully engineered in this work. The 'epidermis' reduces the polarization resistance of O2 reduction reaction on catalyst surface by-24%, and the 'vein' reduces resistance of O2-transport through cathode layer by-65%. Moreover, this biomimetic catalyst increases output power density of the cell by 79% and reverses rapid decay trend of the cell with a 23% increase in power density during first 20 h followed by stabilization at 0.91 W cm-2 (at 750 degrees C and 0.7 V). This discovery provides new avenue for the development of high-performance O2 catalysts with practical applications and enriches the scientific understanding of catalysis.

• 单位
  江苏大学; 桂林理工大学