Phase transition with in situ exsolution nanoparticles in the reduced Pr0.5Ba0.5Fe0.8Ni0.2O3−δ electrode for symmetric solid oxide cells
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Symmetric solid oxide cells (SSOCs) have attracted enormous attention in research and development because of their simple cell configuration and low fabrication costs. However, their development is limited by their electrocatalytic activity and stability of the electrode materials used. Herein, we report a novel perovskite oxide electrode Pr0.5Ba0.5Fe0.8Ni0.2O3−δ (PBFN) as a highly effective SSOC electrode material. The results demonstrate that PBFN has outstanding electrocatalytic potential for the oxygen reduction reaction, oxygen evolution reaction, carbon dioxide reduction reaction, and hydrogen oxidation reaction. After H2 treatment, its structure changes from single to double perovskite and is accompanied by Fe–Ni alloy nanoparticle exsolution. Compared with PBFN, the SSOCs with reduced PBFN qualities show improved electrochemical performance. A reduced PBFN-based device has a higher power density (0.201 W cm−2vs. 0.151 W cm−2 for H2 as a fuel at 750 °C) and an electrolysis current density (0.524 A cm−2vs. 0.353 A cm−2 for the electrolysis of pure CO2 at 750 °C @ 2 V) in comparison to the PBFN approach as is the case with other symmetric cell results. Thus, the reduced PBFN-based device shows favorable stability for both power density and electrolysis modes. These results suggest that phase transition and nanoparticle exsolution is a promising strategy for high performance SSOCs.
Tian , Y , Yang , C , Wang , Y , Xu , M , Ling , Y , Pu , J , Ciucci , F , Irvine , J T S & Chi , B 2022 , ' Phase transition with in situ exsolution nanoparticles in the reduced Pr 0.5 Ba 0.5 Fe 0.8 Ni 0.2 O 3− δ electrode for symmetric solid oxide cells ' , Journal of Materials Chemistry A , vol. 10 , no. 31 , pp. 16490-16496 . https://doi.org/10.1039/d2ta03395j
Journal of Materials Chemistry A
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DescriptionYT, YW, and FC gratefully acknowledge the Research Grant Council of Hong Kong for support through the projects 16206019 and 16201820 as well as the Hong Kong Scholar Program (XJ2021048). This work was supported in part by the Project of Hetao Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone (HZQB-KCZYB-2020083). We gratefully appreciate the financial support from the National Key Research & Development Project (2020YFB1506304, 2017YFE0129300), National Natural Science Foundation of China (52172199, 52072135, 52002121), Fundamental Research Funds for the Central Universities (2021QN1111), the Open Project of Key Laboratory of Green Chemical Engineering Process of Ministry of Education (GCP202118), the Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization (2020KF04), and the Open Sharing Fund for the Large-scale Instruments and Equipment of China University of Mining and Technology (CUMT), the Analytical and Testing Centre of Huazhong University of Science and Technology are all appreciated for their assistance with sample characterization.
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