期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 1, 页码 554-563出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c02447
关键词
proton-electron-oxide ion triple conductor; reversible protonic ceramic cell
资金
- JST MIRAI Realization of low carbon society, global issue [JPMJM17E7]
- JSPS KAKENHI [19H05044, 18H02066]
- Grants-in-Aid for Scientific Research [18H02066, 19H05044] Funding Source: KAKEN
This study demonstrates that using single perovskite-type La0.8Sr0.2Co1-xNixO3-δ oxides as air electrodes can lead to promising performance in protonic ceramic cells operating at intermediate temperatures, around 600 degrees Celsius. The oxides exhibit efficient H+/e(-)/O2- triple conducting capabilities and have the potential to reduce polarization resistance compared to cells with single or double perovskite-type triple conductors.
Highly efficient mixed H+/e(-)/O2- triple conducting air electrodes are indispensable for improving the electrochemical performance of protonic ceramic fuel cells and electrolysis cells (PCFC/ECs) operating at intermediate temperatures. This study demonstrates that single perovskite-type La0.8Sr0.2Co1-xNixO3-delta families (LSCN, x = 0-0.3) are efficient H+/e(-)/O2- triple conductors due to a pronounced hydration ability at elevated temperatures with a related enthalpy of -107 kJ mol(-1). Thermogravimetry confirmed that the oxides were capable of a 0.01 mole fraction proton uptake at 600 degrees C and p(H2O) of 0.023 atm. Reversible protonic ceramic cells were fabricated using these oxides as an air electrode and exhibited promising performance with a peak power density of 0.88 W cm(-2) in fuel cell mode and an electrolysis current of 1.09 A cm(-2) at a thermal neutral voltage in electrolysis cell mode at 600 degrees C. Impedance analysis confirmed that the polarization resistance of the La0.8Sr0.2Co0.2Ni0.3O3-delta cell was 0.09 Omega cm(2) under an open circuit potential at 600 degrees C, which is much smaller than the polarization resistances reported for cells with a single or double perovskite-type triple conductor. The current results indicate that mixed H+/e(-)/O2- triple phase conducting LSCN oxides are promising air electrodes for protonic ceramic cells operating in the intermediate temperature region at approximately 600 degrees C.
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