CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ping Tang,De-Feng Zhou,Xiao-Fei Zhu,Ning Wang,Jing-He Bai
In this paper, the influence of Bi/Zn mass ratio on the phase composition, microstructure, sintering properties, and electrical properties of Bi/Zn co-added Nd 0.2 Ce 0.8 O 1.9 (NDC) used for intermediate-temperature solid oxide fuel cells (SOFCs) was investigated. At 700 °C, the total conductivity of the NDC-based electrolyte (3Bi/1Zn-NDC) with the mass ratio 3:1 for Bi 2 O 3 and ZnO was as high as 5.89 × 10 −2 S cm −1 , 4.60 and 4.51 times higher than the single addition of 4 wt% Bi 2 O 3 and 4 wt% ZnO, respectively. In addition, the 3Bi/1Zn-NDC electrolyte exhibited a good physical and chemical compatibility with the electrode materials. The open circuit voltage (OCV) of the cell supported by the 3Bi/1Zn-NDC electrolyte was 0.67 V, and the output power density could reach 402.25 mW cm −2 at 700 °C. It showed stable power output and OCV in the long-term stability test within 50 h. Overall, the combination of 3 wt% Bi 2 O 3 and 1 wt% ZnO was a very effective dual sintering aid for NDC electrolyte.
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
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
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yijing Gu,Guiyang Luo,Ziliang Chen,Yonglin Huo,FuZhong Wu
Although doped BaCeO 3 electrolytes are proton conductors that undergo the fast conduction processes of inter-mediate temperature solid oxide fuel cells (IT-SOFCs), their wide application is impeded by their poor chemical stability under water vapour or CO 2 conditions. In this work, we selected the metallic cations with suitable electronegativity to improve the perovskite crystal structures of BaCeO 3 to enhance the chemical stability and electrochemical performance. We utilized Ni and Sm cations to improve the chemical stability of BaCeO 3 electrolytes in water vapour and CO 2 via a novel synthesis method, and the results revealed that the BaCe 0.8 Y 0.1 Ni 0.04 Sm 0.06 O 3- δ electrolyte, -with high electrochemical performance and chemical stability-, is a promising electrolyte material for conduction in IT-SOFCs. The optimum result offers new insights into synthesizing the membrane of IT-SOFCs for their application.
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
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
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电化学
·
无机非金属材料
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功能陶瓷
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 9
·2102-2109
·
IF 5.6
Jiang Shanshan,Qiu Hao,Xu Shaohua,Xu Xiaomin,Jiang Jingjing,Xiao Beibei,Julião Paulo Sérgio Barros,Su Chao,Chen Daifen,Zhou Wei
To explore highly active and thermomechanical stable air electrodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs), 10mol% Ta 5+ doped in the B site of strontium ferrite perovskite oxide (SrTa 0.1 Fe 0.9 O 3− δ , STF) is investigated and optimized. The effects of Ta 5+ doping on structure, transition metal reduction, oxygen nonstoichiometry, thermal expansion, and electrical performance are evaluated systematically. Via 10mol% Ta 5+ doping, the thermal expansion coefficient (TEC) decreased from 34.1 × 10 −6 (SrFeO 3− δ ) to 14.6 × 10 −6 K −1 (STF), which is near the TEC of electrolyte (13.3 × 10 −6 K −1 for Sm 0.2 Ce 0.8 O 1.9 , SDC), indicates excellent thermomechanical compatibility. At 550–750°C, STF shows superior oxygen vacancy concentrations (0.262 to 0.331), which is critical in the oxygen-reduction reaction (ORR). Oxygen temperature-programmed desorption (O 2 -TPD) indicated the thermal reduction onset temperature of iron ion is around 420°C, which matched well with the inflection points on the thermos-gravimetric analysis and electrical conductivity curves. At 600°C, the STF electrode shows area-specific resistance (ASR) of 0.152 Ω·cm 2 and peak power density (PPD) of 749 mW·cm −2 . ORR activity of STF was further improved by introducing 30wt% Sm 0.2 Ce 0.8 O 1.9 (SDC) powder, STF + SDC composite cathode achieving outstanding ASR value of 0.115 Ω·cm 2 at 600°C, even comparable with benchmark cobalt-containing cathode, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ (BSCF). Distribution of relaxation time (DRT) analysis revealed that the oxygen surface exchange and bulk diffusion were improved by forming a composite cathode. At 650°C, STF + SDC composite cathode achieving an outstanding PPD of 1117 mW·cm −2 . The excellent results suggest that STF and STF + SDC are promising air electrodes for IT-SOFCs.
研究领域:
材料科学
·
能源化学
·
电化学
·
无机非金属材料
·
热力学与动力学分析
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ke Wang,Jiaqi Yang,Bo An,Qin Zhang,Dongxing Song,Yongqing Wang
This study utilizes the citric acid-EDTA combustion method to synthesize Gd 0.1 Ce 0.9-x Ge x O 1.95 (x = 0.005,0.01,0.04,0.07), marked as nGGDC (n = 0.5,1,4,7), and Gd 0.1 Ce 0.9 O 1.95 (10GDC) composite materials, focusing on electrochemical performance and mechanical properties. The prepared materials all form a cubic fluorite structure. Doping with Ge 4+ increased the densification of the electrolyte, enlarged the grain volume, and reduced the number of grain boundaries, thereby enhancing the dielectric constant. This improvement reduces intragranular resistance and grain boundary resistance, promoting the migration of oxygen ions . The Scavenging Ratio (SR) of Gd 0.1 Ce 0.89 Ge 0.01 O 1.95 (1GGDC) is the highest, reaching 4.1 at 975 K, and the Blocking Factor (∂ t ) of 1GGDC decreases by 52 % compared to 10GDC . 1GGDC exhibits the highest conductivity and the lowest activation energy , increasing by 424 % and decreasing by 20 % compared to 10GDC , respectively. In terms of mechanical properties, compared to 10GDC, 1GGDC samples exhibit improved hardness (10.85 GPa), fracture toughness (3.18 MPa m ½ ), and flexural strength (97.62 MPa). Electrolyte single cells containing 1GGDC demonstrate higher power density and current density, particularly at 1023 K (955 mW/cm 2 vs. 740 mW/cm 2 for 10GDC). According to density functional theory calculations, the oxygen vacancy formation energy, binding energy, and migration barrier of GGDC electrolyte co-doped with Ge and Gd are all lower than those of GDC. Therefore, 1GGDC can be considered as a potential intermediate-temperature solid oxide fuel cells (IT-SOFCs) electrolyte material.
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
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
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Ziwei Dong,Tian Xia,Qiang Li,Liping Sun,Lihua Huo,Hui Zhao
Dual alkaline earth-substituted Pr 0.94 Ba 1–2 x Sr x Ca x Co 2 O 5+ δ perovskites are evaluated as potential cathodes for intermediate-temperature solid oxide fuel cells. When incorporating Sr 2+ and Ca 2+ into the lattice, the phase transformation from tetragonal layered perovskite to simple cubic perovskite can be identified. Benefitting from enhanced electrical conductivity, oxygen surface exchange and ionic diffusion rates, the as-prepared perovskite catalysts demonstrate highly electrocatalytic activity for oxygen reduction reaction. The Pr 0.94 Ba 0.6 Sr 0.2 Ca 0.2 Co 2 O 5+ δ cathode exhibits an area-specific resistance of 0.025 Ω cm 2 at 700 °C, approximately decreased by = 60% relative to the pristine Pr 0.94 BaCo 2 O 5+ δ . It is discovered that Sr 2+ and Ca 2+ co-substituting lowers the charge transfer energy, as well as oxygen adsorption energy. Furthermore, the Pr 0.94 Ba 0.6 Sr 0.2 Ca 0.2 Co 2 O 5+ δ cathode-based fuel cell delivers a peak power density of 1194 mW cm −2 at 700 °C, along with outstanding short-term stability over a period of 160 h. Our results highlight a strategy of dual alkaline earth substitution for rationally designing the perovskite electrocatalysts.
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
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Peng Qiu,Jin Li,Lichao Jia,Bo Chi,Jian Pu,Jian Li,Fanglin Chen
Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) is a promising cathode for intermediate temperature solid oxide fuel cells. However, BSCF cathode performance stability has been a challenge and its electrochemical performance deteriorates severely in the presence of Cr 2 O 3 -forming metallic interconnect. We demonstrate that LaCoO 3-δ (LC) coating on BSCF cathode can not only enhance BSCF electrochemical performance, but also effectively improve the BSCF performance stability. In this study, LC-coated BSCF-Gd 0.1 Ce 0.9 O 1.9 (LC@BSCF-GDC) cathode is prepared through a solution impregnation method and systematically characterized. EIS, XRD, Raman, SEM and EDS tests with and without SUS430 interconnect are conducted to characterize the Cr-tolerance. The results show that BSCF-GDC cathode is susceptible to Cr poisoning while LC@BSCF-GDC cathode has significantly enhanced tolerance to Cr poisoning. Single cells with LC@BSCF-GDC cathode achieve higher peak power density and smaller polarization resistance values than single cells with BSCF-GDC cathode. Furthermore, significant improvement of performance stability under a constant current load has been achieved for single cells with LC@BSCF-GDC cathode. This work provides a new solution for solving BSCF cathode performance stability.
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
SOLID STATE SCIENCES
·
2020
·
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
·
电化学
·
能源材料
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Bayu Admasu Beshiwork,Xinyu Wan,Min Xu,Haoran Guo,Birkneh Sirak Teketel,Yu Chen,Jun Song Chen,Tingshuai Li,Enrico Traversa
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 SrFeO 3− δ perovskite oxide. The DFT calculations suggest that Nb/Ta co-doping can regulate the energy band of the parent SrFeO 3− δ and help electron transfer. In symmetrical cells, such cathode with a SrFe 0.8 Nb 0.1 Ta 0.1 O 3− δ (SFNT) detailed formula achieves a low cathode polarization resistance of 0.147 Ω cm 2 at 650 °C. Electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS) analysis confirm that the co-doping of Nb/Ta in SrFeO 3− δ B-site increases the balanced concentration of oxygen vacancies, enhancing the electrochemical performance 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 °C. Moreover, the button cell shows durability for 110 h under 0.65 V at 600 °C using wet H 2 as fuel.
研究领域:
材料科学
·
电化学
·
能源工程
·
无机非金属材料
·
催化化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jingwei Li,Bo Wei,Xing Yue,Huan Li,Zhe Lü
To develop new anode material for intermediate temperature-solid oxide fuel cells (IT-SOFCs), layered perovskite PrBaFe 1.75 Nb 0.25 O 5+δ (PBFNO) is synthesized and evaluated. PBFNO is partially decomposed in wet H 2 to form a composite including Fe, Pr 2 O 3 , PrBa 2 Nb x Fe 1-x O 6-δ and survival PBFNO. PBFNO anode not only exhibits good electrochemical performance, but also can keep activating during long-term operation which contributed by decomposition continuously. Numerous nanoparticles are exsolved upon the initial short-term reduction, but they are agglomerated severely after the subsequent long-term annealing. Therefore, exsolution mechanisms for stable parent perovskites and partially decomposed perovskites are investigated, and the difference mainly lies in their metal-oxide interfaces with different strengths . Finally, morphology evolutions of the partially decomposed PBFNO anode under electrochemical conversion and chemical reduction are compared to demonstrate that electrochemical conversion can accelerate the agglomeration of PBFNO anode. This work provides insights into morphology evolution and exsolution mechanism of partially decomposed perovskite anode for IT-SOFCs.
研究领域:
材料科学
·
电化学
·
能源材料
·
固体氧化物燃料电池
·
无机非金属材料
·
功能陶瓷
·
电极工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）