JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xinbo Mao,Tian Yu,Guilin Ma
A novel series of cobalt-free cathode materials, NdBaFe 2− x Mn x O 5+ δ (0.0 ⩽ x ⩽ 0.3), are prepared by a citric acid–nitrate process. X-ray diffraction (XRD) analysis indicates that all the samples are double-perovskite phases with cubic structure. The conductivity dependence of the cathode materials on temperature (300–800 °C) and oxygen partial pressure (1–10 −10 atm) is investigated. Among the tested samples, NdBaFe 1.9 Mn 0.1 O 5+ δ (NBFM10) exhibits the highest conductivity of 114 S cm −1 in air at 550 °C. The H 2 /air fuel cell with the NBFM10–BZCY composite cathode and NiO–BZCY composite anode as well as BaZr 0.1 Ce 0.7 Y 0.2 O 3 − α (BZCY) electrolyte membrane (ca. 30 μm thickness) was assembled and tested at 500–700 °C. The peak power density of the cell reaches 453 mW cm −2 , and the interfacial polarization resistance R p is only 0.06 Ω cm 2 under open circuit conditions, at 700 °C.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Yuqian Wang,Defeng Zhou,Weiyi Zhang,Jie Yang,Qingyuan Sheng,Xiaofei Zhu,Jinghe Bai
The advancement and application of mesophilic solid oxide fuel cells (IT-SOFCs) rely heavily on enhancing cathode materials to achieve greater efficiency. In this paper, Pr 0.4 Sr 0.6 Co 0.2 Fe 0.8 O 3-δ (PSFC) and transition metal oxide CoOx were selected as cathode materials, which not only combined the high catalytic activity of Pr 6 O 11 but also took advantage of the structural stability and economy of Fe-based perovskite. The samples underwent analysis using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), and X energy dispersion spectrometer (EDS) for structural examination. The electrochemical workstation was used to test the conductivity of the material and the stability of the cell. The results indicate that an appropriate amount of CoO X composite can effectively enhance the level of oxygen vacancies, thereby enhancing the ORR activity of the cathode. Among these composites, Pr 0.4 Sr 0.6 Co 0.2 Fe 0.8 O 3-δ -CoO x -I exhibits the fastest rate of oxygen exchange at the surface and the best electrochemical performance. At 700 °C, the polarization resistance ASR of Pr 0.4 Sr 0.6 Co 0.2 Fe 0.8 O 3-δ -CoO x -I is 0.0749 Ω cm 2 ; In single-cell fuel mode with NiO-YSZ as anode, YSZ electrolyte, and GDC as cell layer, the peak power density (PDD) is 0.97W cm −2 . The PSCF-CoO x composite cathode holds promise as a high electrocatalytic active material for Solid Oxide Fuel Cells (SOFCs).
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Jia Long Sun,Jian Xin Wang,Chang Rong He,Pin Shen,Qin Wang,He Miao,Wei Guo Wang
In this paper, four types of doped ceria powders and sinters, including Gd 0.1 Ce 0.9 O 1.95 , Gd 0.2 Ce 0.8 O 1.9 , Sm 0.1 Ce 0.9 O 1.95 and Sm 0.2 Ce 0.8 O 1.9 , are prepared and characterized. The results indicate that the Sm 0.2 Ce 0.8 O 1.9 samples possess the lowest densification temperature and a relatively optimal conductivity, which make it more suitable for use as an interlayer compared to other doped ceria. In addition, a series of interlayers were prepared from Sm 0.2 Ce 0.8 O 1.9 powders with different precalcination temperatures using an industrial screen printing method. The area-specific resistances of these interlayers were determined from their microstructures, including the grain and pore size, electrolyte/interlayer interface, layer uniformity and density, which are significantly dependent on the precalcination temperatures of the powders. A minimum area-specific resistance of 0.036 Ω cm 2 at 750 °C was obtained for the sample with Sm 0.2 Ce 0.8 O 1.9 powders precalcined at 950 °C (the corresponding BET value was approximately 20 m 2 g −1 ). In addition, lanthanum strontium cobalt ferrite (LSCF) cells were prepared with the as-prepared Sm 0.2 Ce 0.8 O 1.9 interlayer. Their power density was measured and determined to be 0.72 W cm −2 at 750 °C (0.75 V, active area of 64 cm 2 ).
研究领域:
材料科学
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能源化学
·
电化学
·
无机非金属材料
·
功能陶瓷
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zepeng Li,Yanfeng Ge,Yuhan Xiao,Mingrun Du,Feiran Yang,Yu Ma,Yuan Li,Degong Gao,Huanbin Li,Jinhua Wang,Peng Wang
The high-entropy oxide (HEO) concept expands the design space of solid oxide fuel cell (SOFC) cathode materials . There is great potential for the development of HEO cathode materials that has not been fully explored, and the relationship between their chemical composition, grain size, and electrochemical performance is not yet fully understood. This experimental design involved the preparation of single-phase perovskite (Sr 0.2 Ba 0.2 Bi 0.2 La 0.2 Pr 0.2 )FeO 3 HEO SOFC cathode materials, and we systematically studied the effects of synthesis temperature and microstructure on their electrochemical performance. The results show that as the synthesis temperature increases, structural transformations from multiphase to single-phase perovskite HEO can be observed. It exhibits excellent conductivity and electrochemical performance (the minimum polarization resistance reaches 0.033 Ω∙cm 2 , and the maximum power density is 664 mW∙cm −2 ). The single-phase perovskite HEO sample exhibits higher electrochemical performances compared to those of multiphase perovskite. Furthermore, it exhibits outstanding ability to suppress Sr segregation, chemical compatibility with Ce 0.8 Sm 0.2 O 1.9 (SDC), and CO 2 tolerance performance. The Distribution of relaxation time(DRT) analysis shows that as the synthesis temperature (1000–1150 ℃) increase, HEO single-phase formed and the oxygen atom reduction ability of the SBBLP samples was improved; and the adsorption of gas oxygen on the electrode surface is limited with porosity decreases. The work shows it is interesting and valuable to optimize the performance of SOFC cathode materials using a high entropy design.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 7
·3495-3505
·
IF 14.511
Yang Zhang,Leyu Shen,Yuhao Wang,Zhihong Du,Binze Zhang,Francesco Ciucci,Hailei Zhao
One challenge facing the development of high-performance cathodes for solid oxide fuel cells is the slow oxygen reduction kinetics. Here, we report a dual-phase cathode material, double perovskite structure PrBaCo2O5+δ (PBC) and fluorite structure Gd0.1Ce0.9O2−δ (GDC), successfully synthesized using a one-pot method, with remarkable oxygen reduction reaction activity and low polarization resistance under IT-SOFC service conditions. The coherent interface structure is formed between PBC and GDC particles, which is beneficial to alleviate the lattice thermal expansion. The introduction of the cubic GDC phase can guide the oxygen transport among PBC particles with different orientations. When measured in a symmetrical cell configuration in the air at 600 °C, PBC–10 wt% GDC electrode shows an area-specific resistance of 0.394 Ω cm2, which is about 78% lower than that of bare PBC electrode under the same situations. The charge transfer process on the electrode surface is the rate-limiting step based on the dependence of polarization resistance at different oxygen partial pressures, where the impedance analysis technique, the distribution of relaxation times (DRT), is devoted to describing the complex electrode reaction processes. The GDC introduction significantly decreases the charge transfer resistance of the PBC–GDC composite cathode. The maximum power density of lab-scale electrolyte-supported cell with PBC–10 wt% GDC cathode reaches 1302, 938, 549 and 235 mW cm−2 at 850, 750, 650 and 550 °C, respectively. Our results demonstrate that such dual-phase composites PBC–GDC produced in one step can be considered a promising cathode material for intermediate/low-temperature solid oxide fuel cells.
研究领域:
能源材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Xinbo Mao,Wenbao Wang,Guilin Ma
A novel cobalt-free double-perovskite oxide NdBaFe 1.9 Nb 0.1 O 5+ δ (NBFNb10) was prepared by a solid-state reaction method and investigated as a suitable cathode material for intermediate temperature solid oxide fuel cells (IT-SOFCs). It was discovered that partial substitution of Nb for Fe-site further enhanced the electrical conductivity of NdBaFe 2 O 5+ δ (NBF). The NBFNb10 exhibited the highest conductivity of 109 S cm −1 at 300–800 °C in air, and showed good chemical compatibility with the BaZr 0.1 Ce 0.7 Y 0.2 O 3− α (BZCY) electrolyte. A single cell with the NBFNb10–BZCY composite cathode and NiO–BZCY composite anode-supported BZCY electrolyte membrane (ca. 30 μm thickness) was fabricated and tested at 500–700 °C using H 2 as fuel and air as oxidant. The peak power density and the interfacial polarization resistance ( R p ) were 392 mW cm −2 and 0.14 Ω cm 2 at 700 °C, respectively.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Jinghe Bai,Defeng Zhou,Leilei Niu,Xiaofei Zhu,Ning Wang,Qingwen Liang,Youjie Zhang,Ling Hu,Huifang Gong,Wenfu Yan
Here, in situ assembly in La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ and CoFe 2 O 4 composite (LSCFC) cathode was induced by Pr to form La 0.6 Sr 0.4 Co x Fe y O 3-δ /PrCoO 3 /Co 3 O 4 /PrO 2 (LSCFC-PI) multiphase heterostructures . The surface of LSCFC-PI forms uniform nanoparticles , and the unique core-shell structure prevents Sr segregation, thereby enhancing CO 2 tolerance and increasing oxygen reduction reaction (ORR) active sites. Furthermore, compared with LSCFC, LSCFC-PI increases the oxygen vacancy content of the cathode due to the existence of multiphase heterostructure, improves the ORR kinetics, and the conductivity is also greatly improved. The peak power density (PPD) of LSCFC-PI as a single-cell cathode at 700 ℃ reached 1.51 W cm −2 , which was 2.65 times higher than that of LSCFC's 0.57 W cm −2 , and in the long-term stability test at a constant voltage ∼0.8 V for 100 hours, showing excellent stability. In situ assembly of multiphase heterostructures is expected to become a new strategy for developing high-performance IT-SOFC cathodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2023
·
IF 3.2
Jinghe Bai,Defeng Zhou,Leilei Niu,Ruyi Chen,Xiaofei Zhu,Ning Wang,Qingwen Liang,Wenfu Yan
The development of cathode materials with high oxygen reduction reaction (ORR) activity and stability in intermediate temperature (IT) environments is a key factor in the commercialization of solid oxide fuel cells (SOFC). In this paper, the ORR activity of the cathode is improved by doping high-valent Sc 3+ ions at the B-site of the Sr 0.5 La 0.5 Co 0.8 Cu 0.2-x Sc x O 3–δ (x = 0, 0.02, 0.04), in which Sr 0.5 La 0.5 Co 0.8 Cu 0.18 Sc 0.02 O 3–δ (SLCCS2) shows the best electrochemical performance , and the area-specific resistance of SLCCS2 at 700 °C is only 0.047 Ω cm 2 , much lower than the 0.087 Ω cm 2 of Sr 0.5 La 0.5 Co 0.8 Cu 0.2 O 3–δ (SLCC), and the peak power density of SLCCS2 reached 1.098 W cm −2 , which is 1.84 times that of SLCC (0.598 W cm −2 ). In addition, SLCCS2 effectively reduces the thermal expansion coefficient , improves thermal matching with traditional electrolytes, and overcomes the problem of insufficient long-term SOFC stability caused by the high thermal expansion coefficient of Co-based perovskite to a certain extent. SLCCS2 also exhibits excellent CO 2 tolerance. Considering comprehensively, SLCCS2 is expected to become an IT-SOFC cathode material with development potential.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zhiying Han,Jinghe Bai,Xu Chen,Xiaofei Zhu,Defeng Zhou
The cobalt-free cathode materials with high activity is critical to the commercial application of medium temperature solid oxide fuel cells (IT-SOFC). Herein, a series of cobalt-free Nb-doped Pr 2 Ni 1- x Nb x O 4 ( x = 0, 0.05, 0.10, and 0.15) perovskite oxides were successfully prepared, and the effects of Nb-doping on the structure, thermal stability and electrochemical properties of the cathode material are studied in detail. The Pr 2 Ni 1- x Nb x O 4 exhibits a K 2 NiF 4 type structure with Fmmm space group. The Nb 5+ cations that doped into Pr 2 NiO 4 replaces the Ni site, which increases the surface oxygen content, then effectively eliminates the phase transition of Pr 2 NiO 4 and significantly improves the ORR catalytic activity . The Pr 2 Ni 0.9 Nb 0.1 O 4 was found to occupy the lowest polarization resistance of 0.057 Ω cm 2 , and the peak power density of single cells supported by the electrolyte is 0.576 W cm −2 at 700 °C, which has good long-term stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）