首页|A defective iron-based perovskite cathode for high-performance IT-SOFCs:Tailoring the oxygen vacancies using Nb/Ta co-doping

A defective iron-based perovskite cathode for high-performance IT-SOFCs:Tailoring the oxygen vacancies using Nb/Ta co-doping

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The sluggish kinetics of the electrochemical oxygen reduction reaction(ORR)in intermediate-temperature solid oxide fuel cells(IT-SOFCs)greatly limits the overall cell performance.In this study,an efficient and durable cathode material for IT-SOFCs is designed based on density functional theory(DFT)calculations by co-doping with Nb and Ta the B-site of the SrFeO3-δ perovskite oxide.The DFT cal-culations suggest that Nb/Ta co-doping can regulate the energy band of the parent SrFeO3-δ and help electron transfer.In symmetrical cells,such cathode with a SrFe0.8Nb0.1Ta0.1O3-δ(SFNT)detailed formula achieves a low cathode polarization resistance of 0.147 Ω cm2 at 650 ℃.Electron spin resonance(ESR)and X-ray photoelectron spectroscopy(XPS)analysis confirm that the co-doping of Nb/Ta in SrFeO3-δB-site increases the balanced concentration of oxygen vacancies,enhancing the electrochemical perfor-mance when compared to 20 mol％Nb single-doped perovskite oxide.The cathode button cell with Ni-SDC|SDC|SFNT configuration achieves an outstanding peak power density of 1.3 W cm-2 at 650 ℃.Moreover,the button cell shows durability for 110 h under 0.65 V at 600 ℃ using wet H2 as fuel.

Solid oxide fuel cellCathodeOxygen reduction reactionPower densityDFT calculation

Bayu Admasu Beshiwork、Xinyu Wan、Min Xu、Haoran Guo、Birkneh Sirak Teketel、Yu Chen、Jun Song Chen、Tingshuai Li、Enrico Traversa

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School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,Sichuan,China

The Future Laboratory,Tsinghua University,Beijing 100084,China

School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

School of Environment and Energy,South China University of Technology,Guangzhou 510006,Guangdong,China

Institute for Advanced Study,Chengdu University,Chengdu 610106,Sichuan,China

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National Natural Science Foundation of China

51702039

2024

10.1016/j.jechem.2023.09.015

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.88(1)
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