CERAMICS INTERNATIONAL
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2024
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IF 5.1
Qingjun Zhou,Yuhan Gong,Xinyue Zhang,Zilun Xia
A series of cathode materials of Pr 2-x Sr x NiO 4 (x = 0, 0.3, 0.5, 0.7, 1, 1.5) are synthesized by the EDTA-citric acid route. The results show that the Pr 1.7 Sr 0.3 NiO 4 , Pr 1.5 Sr 0.5 NiO 4 , Pr 1.3 Sr 0.7 NiO 4 and PrSrNiO 4 exhibit excellent structural stability and carbon dioxide resistance, and also exhibit good chemical compatibility and thermal matching with the SDC electrolyte. It is also found that the Sr doping is beneficial in improving the high temperature conductivity of Pr 2-x Sr x NiO 4 . At 800 °C, the electrical conductivity of Pr 1.5 Sr 0.5 NiO 4 and Pr 1.3 Sr 0.7 NiO 4 reaches 185 S cm −1 and 317 S cm −1 , respectively. In addition, the area-specific resistance (ASR) value increases significantly with Sr doping, which reduces the catalytic activity of the material. Acceptable ASR values are obtained for Pr 1.5 Sr 0.5 NiO 4 and Pr 1.3 Sr 0.7 NiO 4 , with ASR values of 0.079 Ω cm 2 and 0.082 Ω cm 2 at 800 °C, respectively. Additionally, the most interesting result is the ASR value obtained after high-temperature thermal decomposition of Pr 2 NiO 4 , where Pr 2 NiO 4 * (decomposed) has the lowest ASR value of only 0.027 Ω cm 2 at 800 °C, showing the best catalytic activity. The maximum power densities of Pr 2-x Sr x NiO 4 (x = 0.5 and 0.7) and Pr 2 NiO 4 * are found to be 515, 430, and 548 mW cm −2 at 800 °C, respectively. These results show that when the Sr doping amount is less than 1.5, the stability of the Pr 2-x Sr x NiO 4 cathode material can be effectively improved, but its catalytic performance is partially sacrificed.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Jinghe Bai,Zhiying Han,Defeng Zhou,Xiaofei Zhu,Ning Wang,Ruyi Chen,Jing He,Wenfu Yan
As a Ruddlesden-Popper (RP) phase solid oxide fuel cell (SOFC) cathode material , Pr 2 NiO 4+δ (PNO) is a critical challenge for SOFC commercialization due to the lack of oxygen vacancies and insufficient redox reaction (ORR) activity. In this paper, various concentrations of La 0.6 Sr 0.4 CoO 3-δ (LSC) nanoparticles are coated on the surface of PNO by an impregnation method, and the ORR kinetics of PNO is found to be improved by constructing a composite cathode with heterointerfaces. The formation of the heterointerface effectively enhances the transfer of interstitial oxygen in the PNO and the oxygen vacancies in LSC, which can promote the conduction of O 2− in the cathode and thus improves the ORR activity of the material. When the impregnation concentration of LSC reached C LSC = 0.2 mol L −1 , the ORR activity can reach the highest level. At 700 °C, the area-specific resistance of PNO-LSC reaches 0.024 Ω cm 2 , which is 83.4% lower than that of PNO (0.145 Ω cm 2 ). And the peak power density of PNO-LSC reaches 0.618 W cm −2 , which is 1.89 times larger than that of PNO (0.327 W cm −2 ). Therefore, the construction of composite cathodes with heterointerfaces via impregnation provides an alternative strategy for enhancing the ORR activity of the cathode materials in SOFC.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
SOLID STATE SCIENCES
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2020
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IF 2.434
Xu Chen,Jianqiu Wang,Qingwen Liang,Xi Sun,Xiaofei Zhu,Defeng Zhou,Jian Meng
A novel Pr 2 NiO 4 (PNO)-Pr 0.2 Ce 0.8 O 1.9 (PCO) composite material was synthesized by typical solid state mixing and modified sol-gel method, and was assessed as a cathode material candidate for intermediate temperature solid oxide fuel cells (IT-SOFCs). The effects of different preparation methods on the microstructure, transport properties, and stability of electrode materials were systematically investigated. It was found that the introduction of PCO enhanced the electrochemical activity of PNO electrode. Among the composite materials, PNO–PCO composite cathode obtained by sol-gel method exhibited the best electrochemical performance. The polarization resistance (R P ) on GDC electrolyte was 0.09 Ω cm 2 at 800 °C. The NiO-GDC/GDC/PNO–PCO single cell yielded maximum output power of 0.57 W cm −2 at 800 °C. Furthermore, the R P exhibited an excellent stability after polarization for 120 h, indicating the good chemical compatibility of PNO–PCO composite cathode with other cell components. The desirable electrochemical properties and stability of PNO–PCO composite demonstrate its potential as a cathode material for IT-SOFCs.
研究领域:
材料科学
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电化学
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能源材料
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燃料电池
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
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IF 6.7
Yihui Liu,Kai Kang,Zhuofei Pan,Chao Wang,Kangtao Jiang,Yun Wang
Pr 2 NiO 4+δ -based (Ruddlesden-Popper) perovskite-structured oxide materials are promising candidates for low and intermediate temperature solid oxide fuel cells (SOFCs) systems. In this study, we prepared a high-performance cubic-fluorite/perovskite heterostructure Pr 6 O 11 -Pr 1.2 Sr 0.8 NiO 4+δ (PO-PSNO) cathode for intermediate temperature SOFCs by solution impregnation method. By changing the impregnation amount of Pr 6 O 11 , the micro-morphology of the heterostructure was regulated, so that the heterostructure interface had the best reactive site. The oxygen reduction reaction (ORR) performance of Pr 1.2 Sr 0.8 NiO 4+δ is improved, and the content of surface Sr in the heterostructure electrode material is reduced. Our results indicate that the synergistic effect of PO particles and PSNO skeleton makes the heterostructure exhibit a high oxygen surface exchange properties and catalytic performance. When the impregnation amount of PO particles reaches about 10% of the PSNO skeleton, the heterostructure has the best ORR activity. The oxygen surface exchange coefficient (K chem ) of 2-PO-PSNO is 5.8 × 10 -4 cm·s −1 , being 1.45 times as that of PSNO at 750 °C. Meanwhile, the polarization impedance (R p ) of 2-PO-PSNO is reduced by 66% to only 0.114 Ω cm 2 . Our study provides a new approach for developing high-performance RP structured perovskite cathodes and demonstrates practical applications in the field of SOFCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Mengyu Yang,Xinyue Zhang,Yawen Wang,Shilun Fu,Zhixing Yang,Qingjun Zhou
In this study, Pr 2-x Sr x NiO 4+δ (x = 0.1, 0.15, 0.2) cathode materials are synthesized via the EDTA-citric acid method, and the effects of low-strontium doping on their crystal structure, phase stability, and electrochemical performance are systematically evaluated. The results show that at a low Sr 2+ doping level, the material maintains the original K 2 NiF 4 -type structure. The results indicate that low-concentration Sr 2+ doping caused no significant change to the crystal structure of the material, while the samples with x=0.15 and x=0.2 maintain relatively good thermal stability at elevated temperatures. Meanwhile, the low content of Sr 2+ can reduce the loss of interstitial oxygen in the cathode material, this balance greatly improves the high-temperature electrical conductivity and electrocatalytic activity. The area specific resistance values of Pr 1.9 Sr 0.1 NiO 4 , Pr 1.85 Sr 0.15 NiO 4 , Pr 1.8 Sr 0.2 NiO 4 at 800 °C are 0.042 Ω cm 2 , 0.027 Ω cm 2 and 0.065 Ω cm 2 , respectively. Another crucial finding is that the maximum power densities of Pr 2-x Sr x NiO 4+δ (x = 0.1, 0.15, 0.2) in the single cells at 800 °C are 505, 598, and 310 mW cm 2 , respectively. In addition, the average thermal expansion coefficient of Pr 2-x Sr x NiO 4+δ ranges from 14.1 to 15.1×10 -6 K -1 between 30 and 1000 °C, closely matching that of conventional electrolytes. These results indicate that Pr 2-x Sr x NiO 4+δ (x = 0, 0.1, 0.15, 0.2) is a promising cathode material for solid oxide fuel cells. This work presents a research framework for optimizing Pr 2 NiO 4+δ cathodes, highlighting that low-level Sr 2+ doping balances stability and activity—both critical attributes for fuel cell materials.
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DOI
高影响因子
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