Facile Deficiency Engineering in a Cobalt-Free Perovskite Air Electrode to Achieve Enhanced Performance for Protonic Ceramic Fuel Cells

被引：3

作者：

Ye, Qirui ^{[1
]}

Ye, Huaqing ^{[1
]}

Ma, Zilin ^{[1
]}

Lin, Haoqing ^{[2
]}

Zhao, Bote ^{[2
]}

Yang, Guangming ^{[3
]}

Dong, Feifei ^{[1
,4
]}

Ni, Meng ^{[5
,6
]}

Lin, Zhan ^{[1
,4
]}

Zhang, Shanqing ^{[1
,4
]}

机构：

[1] Guangdong Univ Technol, Guangzhou Higher Educ Mega Ctr, Sch Chem Engn & Light Ind, Guangdong Prov Key Lab Plant Resources Biorefinery, Guangzhou 510006, Peoples R China

[2] South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Peoples R China

[3] Nanjing Tech Univ, Coll Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 211816, Peoples R China

[4] Chem & Chem Engn Guangdong Lab, Jieyang Branch, Jieyang 515200, Peoples R China

[5] Hong Kong Polytech Univ, Res Inst Sustainable Urban Dev RISUD, Dept Bldg & Real Estate, Hung Hom,Kowloon, Hong Kong 999077, Peoples R China

[6] Hong Kong Polytech Univ, Res Inst Smart Energy RISE, Hung Hom, Kowloon, Hong Kong 999077, Peoples R China

来源：

SMALL | 2024年 / 20卷 / 28期

基金：

中国国家自然科学基金;

关键词：

B-site deficiency; cathodes; cobalt-free; perovskites; protonic ceramic fuel cells; POWER-DENSITY; OXIDE; CATHODE; SPECTROSCOPY; COMPOSITE; EDGE;

D O I：

10.1002/smll.202307900

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

As a crucial component responsible for the oxygen reduction reaction (ORR), cobalt-rich perovskite-type cathode materials have been extensively investigated in protonic ceramic fuel cell (PCFC). However, their widespread application at a commercial scale is considerably hindered by the high cost and inadequate stability. In response to these weaknesses, the study presents a novel cobalt-free perovskite oxide, Ba0.95La0.05(Fe0.8Zn0.2)0.95O3-delta (BLFZ0.95), with the triple-conducting (H+|O2-|e-) property as an active and robust air electrode for PCFC. The B-site deficiency state contributes significantly to the optimization of crystal and electronic structure, as well as the increase in oxygen vacancy concentration, thus in turn favoring the catalytic capacity. As a result, the as-obtained BLFZ0.95 electrode demonstrates exceptional electrochemical performance at 700 degrees C, representing extremely low area-specific resistance of 0.04 omega cm2 in humid air (3 vol.% H2O), extraordinarily high peak power density of 1114 mW cm-2, and improved resistance against CO2 poisoning. Furthermore, the outstanding long-term durability is achieved without visible deterioration in both symmetrical and single cell modes. This study presents a simple but crucial case for rational design of cobalt-free perovskite cathode materials with appreciable performance via B-site deficiency regulation. A novel cobalt-free perovskite oxide with distinctive B-site deficiency tuning, Ba0.95La0.05(Fe0.8Zn0.2)0.95O3-delta (BLFZ0.95) is designed and developed as a cathode for protonic ceramic fuel cells (PCFCs). Benefiting from the optimized crystal and electronic structure and enhanced oxygen vacancy concentrations achieved through B-site deficiency, the BLFZ0.95 cathode demonstrates exceptional electrochemical activity and durability, marking a significant milestone in advanced perovskite-based cathodes for PCFCs. image

引用

页数：8