Journal of Physical Chemistry C
·
2024
·
IF 3.3
Wan Huang,Chuan Tian,Junling Meng,Na Xu,Yao Zhang,Lina Zhao,Haixia Zhong
Oxygen reduction reaction is crucial for the development of intermediate/low-temperature solid oxide fuel cells (SOFCs), thus the development of cathode materials with high catalytic activity and stability is still a great challenge for the commercialization of SOFC. In this study, a series of La1–xPrxCo0.5Ni0.5O3−δ (x = 0.5, 0.75, and 1.0) perovskite oxides were prepared as oxygen reduction reaction catalysts for SOFC. First, the polycrystalline powders were synthesized by a Pechini method, and the crystal structure was confirmed as orthorhombic symmetry with Pbnm (No. 62) space group. Second, it was found that PrCo0.5Ni0.5O3−δ (PCN) presents the best electrochemical performance among the three compounds. The polarization impedance of PCN was 0.0383 Ω cm2 and the peak power density reached 1.47 W cm2 using wetted hydrogen as fuel and air as the oxidant measured at 850 °C. Meanwhile, the single cell with PCN as the cathode could stably work for 100 h at 750 °C without damping. Finally, combined with the first-principles calculations, it was revealed that the doping of Pr ion can effectively reduce oxygen vacancy formation energy and mainly changed the valence states of Co and Ni ions at B-site. Therefore, PCN is expected to be a promising cathode material for SOFC.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Guobing Deng,Kai Kang,Yihui Liu,Chao Wang,Cheng Cheng Wang
Solid oxide fuel cell (SOFC) stands out as a highly promising energy conversion device, which can convert chemical energy directly into electrical energy. However, the decline in catalytic activity of the cathode becomes a major challenge for the commercialization of SOFC. Here, based on Pr0.6Sr0.4Co0.2Fe0.8O3−δ (PSCF), two novel A-site high-entropy perovskite cathodes, (Pr0.2Sr0.2La0.2Ba0.2Ca0.2)Co0.2Fe0.8O3−δ (PSLBCCF) and (Pr0.2Sr0.2La0.2Ba0.2Nd0.2)Co0.2Fe0.8O3−δ (PSLBNCF), are reported as high-catalyst-activity cathodes for SOFC. The synergistic action of high-entropy elements causes the valence state changes of the A-site Pr element and B-site Co–Fe element, which weakens the bonding energy of the metal element with O. It regulates the adsorption of surface oxygen and the dissociation of lattice oxygen, which enhances the transport of oxygen ions and greatly improves the oxygen reduction reaction and catalytic activity of the cathode. The polarization resistance (Rp) values of PSLBCCF and PSLBNCF cathodes at 750 °C are 0.083 and 0.072 Ω cm2, respectively, which are significantly lower than that of PSCF (0.122 Ω cm2). At 800 °C, the single cell supported by La0.8Sr0.2Ga0.8Mg0.2O3−δ as the electrolyte and high-entropy PSLBNCF as the cathode exhibited a power density of 561.09 mW cm–2. This study provides a new strategy for achieving excellent catalytic activity cathodes for SOFC.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
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IF 4.527
Yifei Zhang,Muhammad Yousaf,Xinlei Yang,Jingjing Liu,Hao Wang,Fan Yang
Structural design/doping strategy is an efficient method to prepare electrolytes with high oxygen ionic conductivity , but there is still hindrance for solid oxide fuel cell (SOFC) commercialization. Recent advances in semiconductor ionic materials have developed a novel strategy in designing low-temperature electrolyte materials. Here, a heterostructure composite of LSFC (La 0.6 Sr 0.4 Fe 0.8 Cu 0.2 O 3-δ ) and SDC (Sm 0.2 Ce 0.8 O 2−δ ) is developed. The LSFC-SDC composite exhibits a high ionic conductivity, >0.1S/cm at 550 °C. With symmetrical NCAL (Ni 0.8 Co 0.15 Al 0.05 LiO 2-δ )-coated electrode, cells with SDC-LSFC electrolyte exhibit high open-circuit voltage (OCV), and achieve a significant power improvement (>1000 mW/cm 2 ) compared with pure SDC electrolyte at 550 °C. The short-term stability result has proven the operating ability of SDC-LSFC electrolyte under fuel cell environment (H 2 /air). This work demonstrates a new developing route of low-temperature solid oxide fuel cell (LTSOFC), which is different from the conventional SOFC.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 30
·14398-14412
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IF 4.682
Zhou Dacheng,Yuan Chuan,Chen Xiyong,Chen Fangze,Xiong Xueqing,Liu Yihui,Yan Jialin,Fujita Toyohisa
Double-perovskite materials La 1− x Pr x BaCo 2 O 5+ δ (LPBCO), suitable for the application of intermediate-temperature solid oxide fuel cell (IT-SOFC) and other electrochemical devices, were successfully prepared through solid-state reaction method. The effects of La and Pr doping ratios on the crystallographic structure, thermochemical stability, thermal expansion, electrical conductivity, and electrochemical polarizations were analyzed and discussed. The X-ray diffraction results show that the crystal structure changes from single perovskite to double perovskite with the increase in Pr doping content. LPBCOs present excellent chemical stability with conventional electrolyte GDC at less than 1100 °C. The thermal expansion can be effectively reduced upon doping of Pr. The materials demonstrate high electrical conductivity even under relatively low temperatures, i.e., LP-73 ( x = 0.3 with single perovskite) has the highest conductivity at 1680 S/cm at 400 °C. Among the double-perovskite compositions, LP-55 presents the highest performance in electrical conductivity though. Analysis of the electrochemical impedance spectra of LPBCOs symmetric cells reveals low area specific polarization resistances for these double-lanthanide-doped double-perovskite materials, and the charge transfer is determined as the dominating sub-process for the oxygen transport through the materials. All the findings show that La 1− x Pr x BaCo 2 O 5+ δ possesses excellent oxygen reduction activity and is promising for the application in IT-SOFCs.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
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IF 8.3
Qingyuan Sheng,Yaping Zhang,Xiaofei Zhu,Qiwei Chen,Shangyu Li,Jinghe Bai,Wenfu Yan,Defeng Zhou
Enhancing the oxygen reduction catalytic activity and thermal compatibility of cathode materials under intermediate-temperature conditions remains pivotal for advancing the commercialization of solid oxide fuel cells (SOFCs). Therefore, this article regulates the crystal structure of NdBaCo 2 O 5+δ (NBC)-based double perovskite by Cu, replacing Co with a small amount of Cu ions to increase the oxygen vacancy content of the cathode material and reduce the thermal expansion coefficient (TEC) of NBC-based materials, to improve the electric catalytic activity and long-term stability of SOFC. The distribution of relaxation time results confirms that compared with NBC, NdBaCo 1.8 Cu 0.2 O 5+δ (NBCC2) can greatly enhance oxygen's dissociation and adsorption rates. As a symmetrical cell at 650 °C, the area-specific resistance (ASR) of NBCC2 is only 0.067 Ω cm −2 , which is about 40 % of NBC. As the cathode of SOFC, the maximum power density of the NBCC2-based cell reaches 0.67 W cm 2 , which is 1.58 times that of NBC, and Cu doping improves the long-term stability problem caused by the high TEC of Co-based materials. This study provides an effective solution for further enhancing the electrocatalytic activity of Co-based perovskite and addressing stability issues caused by high TEC.
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
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Yijun Cheng,Longwei Zhou,Halefom G. Desta,Dong Tian,Bin Lin
The high operational temperature of solid oxide fuel cells (SOFCs) remains a significant barrier to their industrial application. Developing efficient cathode materials that perform well at lower temperatures is essential to overcome this challenge. Despite the remarkable magnetic properties of La 1.4 Ca 1.6 Mn 2 O 7-δ , its electrochemical characteristics have been largely overlooked. Here, we propose a novel strategy involving bismuth doping to enhance La 1.4 Ca 1.6 Mn 2 O 7-δ , creating a modified perovskite manganite structure. The optimized bismuth doping significantly reduces the polarization resistance (R p ) from 1.17 to 0.20 Ω·cm² and boosts the power output from 109.0 to 1067.3 mW·cm -2 . Furthermore, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analyses confirm that bismuth doping effectively improves the structural stability of perovskite manganite. The single cell maintains a stable current density over 50 hours at 700°C, demonstrating excellent durability. These findings highlight the potential of bismuth-doped perovskite manganite cathode to lower-temperature SOFCs.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Peng Qiu,Lei Wu,Kun Cheng,Shaowen Wu,Huiying Qi,Chunyan Xiong,Baofeng Tu
Fuel flexibility is one of the significant advantages of solid oxide fuel cells (SOFCs). The utilization of methane in SOFCs can not only reduce fuel costs, but also greatly expand its application scenarios, which is of great significance to the commercial development of SOFCs. However, when methane is directly used, Ni-based cermet anode suffers from coking, which seriously affects the durability of the cell. To alleviate the coking issue, a reforming layer outside the Ni-based anode-supporter was proposed in this study, and Ba 0.9 (Zr 0.8 Y 0.2 ) 1- x Ni x O 3-δ (BZYNi x , x = 0.05, 0.1, 0.15 and 0.2) was used as reforming layer material. Among BZYNi x catalysts, BZYNi 0.2 exhibited excellent catalytic activity toward dry reforming of methane, and methane conversion was as high as 85% at 750 °C. The excellent catalytic durability and coking-resistance of BZYNi 0.2 were also confirmed. When BZYNi 0.2 reforming layer was applied, the single cell fueled with CH 4 –CO 2 fuel showed significantly improved electrochemical performance, durability and coking-resistance. The utilization of BZYNi 0.2 reforming layer provides guidance for solving the coking issue of SOFC cermet anodes when fueled with hydrocarbon.
研究领域:
能源材料
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催化化学
✓ 已验证
DOI
高影响因子
Materials Today Energy
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2020
·
IF 5.604
Q. Li,X. Wang,L. Jia,B. Chi,J. Pu,J. Li
To achieve high performance and carbon-deposition resistance, solid oxide fuel cells (SOFCs) with a nickel-10 wt% iron alloy support, a 10 wt% gadolinium doped cerium oxide electrolyte (GDC), a La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 -GDC (LSCF-GDC) cathode, and a Ni-GDC anode with (modified anode cell, MAC) or without (conventional anode cell, CAC) NiMn 2 O 4 modification are prepared and evaluated with H 2 and CH 4 fuels. During the cell fabrication, the GDC in the anode of MAC is doped by Mn and Fe through reaction with NiMn 2 O 4 and Fe diffusion from the support with increased electrical conductivity and catalytic activity; and the Ni granules in the anode is decorated with fine MnO particles, which increases their porosity and resistance to agglomeration and carbon deposition. As a result, MAC demonstrates higher performance and durability than CAC, with a maximum power density of 1278 and 1208 mW cm −2 at 700 °C with H 2 and CH 4 as the fuel, respectively, in contrast to 998 and 895 mW cm −2 for CAC. And the cell voltage of MAC fueled by CH 4 is maintained on the level of 0.66 V for up to 100 h at 650 °C without carbon deposition in the anode, while that of CAC decreases continuously with significant carbon formation.
研究领域:
能源材料
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Shengli Pang,Wenzhi Wang,Tao Chen,Yonggang Wang,Kaijie Xu,Xiangqian Shen,Xiaoming Xi,Jiwei Fan
An understanding of the relationships between the processing, compositions , and properties of perovskites is vitally important in the search for high performance cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). In this work, the properties of PrBa 1−x Co 2 O 5+δ (x = 0.00–0.10) double perovskites were modified by introducing K during synthesis, and their performances as the cathode materials for IT-SOFCs were then characterized. The addition of K resulted in a greater cation deficiency in the double perovskites, improving bulk oxygen transport. However, K addition also markedly decreased the Co ion content on the perovskites' surfaces, which significantly deteriorated the perovskites’ electrochemical performances related to the surface exchange of oxygen.
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
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Shuying Zhen,Wang Sun,Peiqian Li,Guangze Tang,David Rooney,Kening Sun,Xinxin Ma
In this work Cu 1.4 Mn 1.6 O 4 (CMO) spinel oxide is prepared and evaluated as a novel cobalt-free cathode for intermediate temperature solid oxide fuel cells (IT-SOFCs). Single phase CMO powder with cubic structure is identified using XRD . XPS results confirm that mixed Cu + /Cu 2+ and Mn 3+ /Mn 4+ couples exist in the CMO sample, and a maximum conductivity of 78 S cm −1 is achieved at 800 °C. Meanwhile, CMO oxide shows good thermal and chemical compatibility with a 10 mol% Sc 2 O 3 stabilized ZrO 2 (ScSZ) electrolyte material. Impedance spectroscopy measurements reveals that CMO exhibits a low polarization resistance of 0.143 Ω cm 2 at 800 °C. Furthermore, a Ni-ScSZ/ScSZ/CMO single cell demonstrates a maximum power density of 1076 mW cm −2 at 800 °C under H 2 (3% H 2 O) as the fuel and ambient air as the oxidant. These results indicate that Cu 1.4 Mn 1.6 O 4 is a superior and promising cathode material for IT-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
ACS Applied Energy Materials
·
2022
·
IF 6.959
Chengzhi Sun,Yu Kong,Yongchao Niu,Xiaoju Yin,Naiqing Zhang
The mixed ionic and electronic conductor (MIEC), as a classical family of high-performance cathode materials, is essential for ensuring the low-temperature operation performance and high efficiency of solid oxide fuel cells. The Fe-based double perovskites get the advantages of low cost, good thermal compatibility with the electrolyte, and good high-temperature stability, showing good application promise. However, due to the unsatisfactory electrochemical properties, Fe-based double perovskite MIECs are generally not sufficiently active for the oxygen reduction reaction. Herein, the consequences indicate that Zr-substitution of the Fe sites in the NdBaFe2O6-δ(NBF) lattice can obtain a higher oxygen vacancy concentration and a more high-lying position of the O p-band center simultaneously. Then, the Zr-doped NBF cathode obtains a higher oxygen-ion diffusion and oxygen surface exchange coefficients. The lower polarization resistance for NdBaFe1.9Zr0.1O6-δmeasured at 700 °C is 0.066 Ω·cm2 compared to 0.104 Ω·cm2 for NBF.
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
ENERGY & FUELS
·
2023
·
IF 5.3
Yixue Yang,Qiang Hu,Guimin Zhang,Xun Xie,Yuxin Liu,Liming Zhou,Kejing Wu,Houfang Lu,Bin Liang
Supported Ni on yttria stabilized zirconia (YSZ) is the most widely used anode for a solid oxide fuel cell (SOFC), where Ni particles are easy to agglomerate at a high temperature of 1400 °C and reductive hydrothermal environments. In this study, Ni particles are successfully dispersed on YSZ through strong interaction between Ni and SiO2. The thin and amorphous SiO2 films, grown by low-temperature chemical vapor deposition (CVD), become spherical particles of nickel silicates uniformly dispersed on the YSZ skeleton after sintering at 1400 °C. Also, the SiO2-anchored Ni particles supported on YSZ (Ni/YSZ-SiO2) are obtained via direct reduction. The electrochemical performance of the Ni/YSZ-SiO2 anode shows a higher power density of approximately 18% than an unmodified Ni/YSZ anode, which resulted from the longer effective TPB area assigned to the highly dispersed Ni particles. The microstructure containing SiO2-anchored Ni particles exhibits high stability under testing and reductive hydrothermal conditions. Accordingly, the method of growing a SiO2 layer via low-temperature CVD is considered as a probable route for the preparation of the Ni/YSZ electrode material with a well-defined microstructure.
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
危险品化学品经营许可证（带存储）