Hao Qiu,Jing Zhao,Zhixian Liang,Mingzhuang Liang,Shanshan Jiang,Beibei Xiao,Wei Wang,Chao Su
Protonic ceramic fuel cells (PCFCs) have been deemed as the advanced technology for highly efficient energy conversion, while the practical application of this technology is limited by the oxygen electrode's sluggish reaction kinetics for the oxygen reduction reaction (ORR). Herein, we propose facile anion engineering to develop an innovative oxide with a nominal composition of SrTa 0.1 Fe 0.9 O 2.95–δ Cl 0.05 (denoted as STFCl0.05). The ORR activity, hydration, and operation stability of STFCl0.05 are enhanced owing to doping chlorine. STFCl0.05 possesses low area-specific resistance (ASR) values in 3 vol % H 2 O-air (e.g., 0.12 Ω cm 2 at 650 °C), which are lower than those of SrTa 0.1 Fe 0.9 O 3–δ (STF). Furthermore, the resultant STFCl0.05 based-PCFCs at 650 °C can achieve a superior peak power density (PPD) value of 804 mW cm −2 under a wet H 2 atmosphere. More attractively, the symmetrical cell operates stably for 180 h, and the single cell operates for 200 h. This anion engineering may be rewarding for in-depth design for developing high-performance PCFCs oxygen electrodes in the future.
Hao Qiu,Mingzhuang Liang,Jing Zhao,Zhixian Liang,Shanshan Jiang,Huangang Shi,Wei Wang,Huabing Wen,Chao Su
In order to accelerate the widespread application of solid oxide fuel cells (SOFCs), especially proton-conducing solid oxide fuel cells (PCFCs), it is crucial to develop a cathode material with high activity for the oxygen reduction reaction (ORR), excellent long-term stability and CO 2 tolerance. Herein, an A-site deficient cobalt-free (Co-free) perovskite oxide Sr 0.95 Ta 0.1 Fe 0.9 O 3-δ (S 0.95 TF) is prepared by introducing cation deficiencies into SrTa 0.1 Fe 0.9 O 3-δ (STF), and it proves to be a highly active cathode. The increased oxygen vacancies , the decreased thermal expansion coefficient (TEC) value and improved CO 2 tolerance, efficiently enhance electrochemical performance and durability during long-term stability testing. As a result, the area specific resistance (ASR) values of S 0.95 TF at 600 °C are only 0.095 and 0.42 Ω cm 2 with the Sm 0.2 Ce 0.8 O 1.9 (SDC) and BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) electrolytes, respectively. In addition, both of the single cells with S 0.95 TF cathodes, based on different electrolytes, can function stably for 200 h without obvious performance decrease. These results clearly demonstrate that S 0.95 TF is a highly promising candidate for both oxygen ion-conducting SOFCs and PCFCs.
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