期刊
JOURNAL OF POWER SOURCES
卷 508, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230343
关键词
Tubular reversible protonic ceramic cell; Ruddlesden-popper oxide; Oxygen; protonic defects; Fluorination; Hydratability
资金
- National Natural Science Foundation of China [22078022]
- China Postdoctoral Science Foundation [2021M690379]
This study aims to improve the electrochemical activity of the traditional triple conducting oxide Pr2NiO4+delta by introducing F-, which enhances the hydratability and protonic conductivity of the material. Experimental results show that the designed material exhibits excellent performance in both fuel cell and electrolysis modes.
Reversible protonic ceramic cells (RPCCs) demonstrate increasingly potential for alleviating the worldwide energy crisis and environmental contamination through the efficient conversion between hydrogen and electricity. Reliable air electrode materials with high electrochemical activity and sufficient durability are imperatively desired for the commercialization process. Herein, the effort is targeted to improve electrochemical activity of Pr2NiO4+delta, a traditional triple conducting oxide with inherent durability. Through introducing the highly electronegative F-, the as-designed material demonstrates improved hydratability and protonic conductivity due to the attenuated the metal-oxygen bond energy which is beneficial for the diffusion of oxygen and protonic defects. As expected, the targeted material exhibits excellent performance as the air electrode of RPCCs, i.e. a peak power density of 0.58 W cm-2 in the fuel cell mode and a current density of 2 A cm-2 at 1.3 V in an electrolysis mode at 650 degrees C. Eventually, the tubular RPCCs are also successfully fabricated based on this designed material and exhibit promising performance. This work offers a substantial method to design superior air electrodes for RPCCs with excellent electrochemical activity and sufficient durability.
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