ChemSusChem
·
2025
·
IF 6.6
Bing Yang,Mingxu Sun,Peng Li,Kaichao Yin,Mengjia Wang,Bo Li,Jing Chen,Xuzhuo Sun,Yunfeng Tian,Kaisheng Xia,Bo Chi
Graphical This study optimizes Sm 0.5 Sr 0.5 CoO 3-δ cathodes by tuning B-site cobalt content (x = 1.0–1.3). Sm = Sr 0.5 CoO 3-δ exhibits superior electronic conductivity, oxygen reduction activity, and stability. At 550°C, its polarization resistance is 0.517 Ω cm 2 . A single cell achieves 1.054 W cm -2 peak power density at 700°C (25% higher), confirming B-site stoichiometry modulation as an effective strategy for enhanced performance. High-performance solid oxide fuel cells (SOFCs) operating at intermediate to low temperatures require cathode materials with enhanced activity and stability. This study investigates the effect of excess B-site cations on the electrochemical performance of Sm 0.5 Sr 0.5 CoO 3-δ (SSC) electrodes. A series of Sm 0.5 Sr 0.5 Co 1+x O 3-δ (SSC1 + x, X = 0, 0.05, 0.1, 0.15, and 0.3) perovskite cathodes with varying Co excess are synthesized to investigate their effect on electrical conductivity, oxygen vacancy formation, and overall cathode properties. The Sm 0.5 Sr 0.5 Co 1.1 O 3-δ (SSC1.1) composition demonstrates a polarization resistance of 0.517 Ω cm 2 at 550 °C, outperforming the standard SSC cathode (0.711 Ω cm 2 ). Moreover, single cells with SSC1.1 cathodes achieve a peak power density of 1.054 W cm −2 at 700 °C, marking a 25% improvement over standard SSC cathodes (0.842 W cm −2 ). These results highlight the potential of SSC1.1 as an advanced cathode material for enhancing SOFC performance at reduced temperatures.
研究领域:
能源材料
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电化学
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燃料电池
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材料科学
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固态器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bing Yang,Bo Wang,Peng Li,Jing Chen,Bo Li,Lushan Ma,Futian Zhang,Haitao Guo,Yunfeng Tian,Xuzhuo Sun,Bo Chi
In this study, we developed an innovative strategy to fabricate perovskite oxide powder with 12.356 m 2 /g of specific surface area. Polyacrylamide hydrogel was used as a template to prepare Sm 0.5 Sr 0.5 CoO 3-δ (SSC) powders with lamellar structure. The three-dimensional interconnected structured SSC electrodes with lamellar connections were fabricate using screen printing method. As a result, the oxygen vacancy concentration of the SSC powder obtained by the polyacrylamide template method was 0.625 and 0.642 at 650 °C and 700 °C respectively. At 650°C, the polarization resistance value was 0.11 Ω cm 2 for the novel SSC-PAM-V cathode. Compared with the SSC-SG cathode, the polarization resistance and activation energy of SSC-PAM-V were reduced by 50 % and 6.9 %, respectively. Furthermore, in a single cell with SSC-PAM-V electrodes, we achieved a maximum power density of 935 and 1243 mW cm −2 at 650 °C and 700 °C under wet H 2 conditions, demonstrating good electrochemical output performance. The layered porous electrode was not only suitable for the diffusion of oxygen, but also for increasing the reactive active sites. The proposed powder prepared with polyacrylamide hydrogel as template, was not only suitable for the optimization of perovskite oxide, but also for the application in other types of catalysis, providing the potential for improving the electro-catalytic activity of perovskite electrodes.
研究领域:
材料科学
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电化学
·
能源材料
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催化化学
·
固体离子学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Pengkai Shan,Hui Ye,Bin Qian,Yifeng Zheng,Guoping Xiao
Ruddlesden–Popper (R-P) oxides (A n+1 B n O 3n+1 ) are potential air electrodes for solid oxide electrolysis cells (SOECs) because of their good electrochemical performance. Among them, SrEu 2 Fe 2 O 7-δ (SEF) with n = 2 has received extensive attention because of its special structure and promising ionic–electronic conductivity. However, the SEF material is prone to degradation at high temperatures (600 °C–800 °C), and its long-term stability is easily affected. In this study, R-P oxide Sr 1-x La x Eu 2 Fe 2 O 7-δ (SLEFx; x = 0, 0.05, 0.1) was successfully synthesized using the sol–gel method. XRD results showed that La-doped SEF displayed good chemical and thermal compatibility with the gadolinia-doped ceria electrolyte. The SLEF0.05 electrode exhibited a polarization resistance of 0.075 Ω cm 2 at 800 °C, which was 88.2 % lower than that of SEF. The half-cell based on the SLEF0.05 air electrode exhibited improved performance under the long-term stability test at a current density of − 0.5 A cm −2 for over 110 h at 800 °C, indicating excellent stability. Moreover, an electrolysis current density as high as 0.712 A cm −2 at 1.5 V was obtained for the full cell with the SLEF0.05 air electrode, which was 45.8 % higher than the SEF electrode when the temperature and feed gas were 800 °C and 50 % CO 2 –50 % CO, respectively. The XPS and cell testing results confirmed that La with high valance and small radius promoted the formation of oxygen vacancies and effectively enhanced the electrochemical performance and structural stability of the SEF material. Therefore, the R-P oxide SLEF0.05 is a promising air electrode material for SOECs.
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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催化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·Vol. 42
·期 34
·22294-22301
·
IF 3.582
Jiang Li,Tianmu Lv,Nianjun Hou,Ping Li,Xueli Yao,Lijun Fan,Tian Gan,Yicheng Zhao,Yongdan Li
The effects of Mo doping into the B-site of La 0.3 Sr 0.7 TiO 3-δ perovskite on its ionic conductivity and catalytic activity as an anode material of solid oxide fuel cells have been investigated. The partial substitution of Ti by Mo reduces the bond energy between metal and oxygen ions in the perovskite. The concentration of Mo 5+ /Mo 6+ redox couples increases with the rise of the content of Mo, while the oxygen ionic conductivity decreases simultaneously. The doping of Mo significantly reduces the anodic polarization resistance and improves the performance of the single cell. The cell with La 0.3 Sr 0.7 Ti 0.97 Mo 0.03 O 3-δ anode and La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ electrolyte exhibits a maximum power density of 135 mW cm −2 at 850 °C with hydrogen as fuel.
研究领域:
材料科学
·
电化学
·
能源材料
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固态离子学
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燃料电池技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Kai Ma,Jietao Wang,Yao Luo,Xu Chang,Tong Liu,Yao Wang,Mingyue Ding
This study demonstrates the successful fabrication of (La 0.6 Sr 0.4 ) 0.95 MnO 3-δ (LSM) nanofibers via the electrospinning technique for intermediate-temperature solid oxide fuel cell application. The as-prepared LSM nanofiber cathode exhibit superior electrochemical performance compared to the conventional LSM cathode due to its unique three-dimensional network structure with enhanced oxygen vacancy concentration, larger specific surface area of 26.664 m 2 g −1 as well as improved oxygen surface exchange kinetics, thereby leading to a 14 % reduction in polarization resistance from 5.24 to 4.53 Ω cm −2 750 °C and a lowered activation energy from 0.81 to 0.70 eV in the symmetrical cell tests. Meanwhile, the single cell also achieves enhanced maximum power densities of 0.400, 0.289, and 0.153 W cm −2 at 800, 750, and 700 °C, respectively, and has the excellent operational stability over 50 h. Our findings in this work can provide valuable insights into the rational design of efficient and robust SOFC cathodes through the nanostructural engineering strategy such as the electrospinning technique.
研究领域:
材料科学
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能源技术
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纳米技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Fangjie Liu,Zhiyang Guo,Zaifu Gong,Haizhao Li,Wuhui Li,Yuliang Liu,Qingjie Wang
In this study, xBaZr 0.1 Ce 0.7 Y 0.2 O 3-δ (BZCY)-PrO 2 (where x represents the ratio of BZCY to PrO 2 , x = 20, 10, 5) composite powders were synthesized via an in-situ exsolution method. These powders were then mixed with La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3-δ (LSCF) to fabricate LSCF-xBZCY-PrO 2 nanocomposite cathodes for protonic ceramic fuel cells (PCFCs). Consequently, the cathode with x = 10 demonstrated the optimal electrochemical performance, achieving a low polarization resistance ( R p) of 0.268 Ω cm 2 and a peak power density (PPD) of 0.52 W cm −2 at 650 °C, outperforming both the LSCF-20BZCY-PrO 2 and LSCF-5BZCY-PrO 2 cathodes. These values represent a significant improvement compared to conventional LSCF-BZCY cathodes ( R p = 0.506 Ω cm 2 , PPD = 0.338 W cm −2 ). Furthermore, the LSCF-10BZCY-PrO 2 cathode demonstrated excellent short-term stability under working conditions and operated continuously for 100 h. XPS, EIS, and DRT analyses revealed that the enhanced performance is primarily attributed to the improved oxygen reduction reaction (ORR) kinetics, facilitated by the incorporation of PrO 2 elements and the formation of a nanostructured morphology. This work presents a simplified and effective strategy for developing high performance nanocomposite multiphase cathodes for PCFCs, offering valuable insights into their practical application.
研究领域:
电化学
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材料科学
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能源材料
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固体氧化物电化学
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燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
Energy Material Advances
·
2023
·
IF 12.9
Guangdong Li,Yunjie Gou,Rongzheng Ren,Chunming Xu,Jinshuo Qiao,Wang Sun,Zhenhua Wang,Kening Sun
Solid oxide electrolysis cells (SOECs) have emerged as one of the most potent techniques for hydrogen production. As the restricted step for SOEC, as well as the most predominant obstacle to the scaled application, oxygen evolution reaction (OER) should be urgently accelerated by developing potent electrocatalysts. Despite inferior electrochemical activity to cobalt-based materials, perovskite ferrites exhibit great potential in the future with regard to good intrinsic stability and durability, abundant reserves, and good compatibility with other SOEC components. In this work, fluorination is introduced to the typical perovskite ferrite to further intensify the OER process. Ab initio calculations combined with physical–chemical characterizations are performed to reveal the mechanism. The doped F− leads to debilitating the strength of the metal–oxygen bond and then reduces the energy for oxygen vacancy formation and ion migration, which renders improvements to sub-processes of OER on the anode. The well-verified material, PrBaFe2O5+δF0.1 (PBFOF), exhibited a low polarization resistance of 0.058 Ω cm−2. Single cells based on PBFOF showed a high current density of 2.28 A cm−2 at 750 °C under 1.3 V. This work provides a clear insight into the mechanism of fluorination on perovskites and high-activity anode material for SOEC.
研究领域:
材料科学
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电化学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Shihang Guo,Lin Wang,Chenyang Xue,Sumei Lin,Tingxuan Yi,Yuwen Zhu,Donglin Han
Protonic ceramic cells (PCCs) can convert the energy between electricity and fuels efficiently, and are attracting increasing attention. However, the development of PCCs is restricted by the lack of proper positrode materials. In this work, we report a Co-free system with a nominal composition of BaCe 0.2 Fe 0.8 O 3-δ , which is composed of a Fe-rich matrix phase decorated with Ce-rich nanoparticles. The performance of such a dual-phase positrode system is further improved by doping Zn and/or Ni to increase bulk and surficial concentration of oxygen vacancies. The hydration reaction and surficial adsorption of oxygen species are thereby promoted, benefitting the oxygen reduction reaction. The Ni and Zn co-doped composition Ba(Ce 0.2 Fe 0.8 ) 0.85 (Ni 0.5 Zn 0.5 ) 0.15 O 3-δ exhibits lower polarization resistance than the pristine and singly doped systems, enabling the fuel cells to show high peak power densities of 400, 721, and 828 mW cm −2 at 550, 600, and 650 °C, respectively.
研究领域:
材料科学
·
电化学
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2025
·
IF 2.9
Yuanyuan Ma,Songbo Li,Zhen Yan,Shengli An,Hongli Qiao,Yanpeng Liu,Jing Zhang,Xu Zhang,Guangrui Zhang,Jing Zhao
This study systematically investigates the effect of Ni doping on the electrochemical performance of La0.6Sr0.4Fe1−xNixO3−δ (LSFNx) cathode materials for intermediate-temperature solid oxide fuel cells (IT−SOFCs). By tuning the Ni content at the Fe site (x = 0−0.2), the composition with x = 0.15 exhibits the optimal overall performance. Ni doping enhances the material's properties through a dual mechanism: on one hand, it regulates the Fe3+/Fe4+ redox couple, optimizing the balance between charge carrier concentration and mobility, resulting in a conductivity of 479.68 S·cm−1 at 800 ℃—approximately double that of undoped LSF (224.41 S·cm−1); on the other hand, it promotes the formation of oxygen vacancies, thereby improving oxygen ion transport. Combined analysis using distribution of relaxation times (DRT) and electrochemical impedance spectroscopy (EIS) confirms that Ni incorporation reduces the activation energy of the oxygen reduction reaction (ORR). As a result, LSFN0.15 achieves a polarization resistance of only 0.071 Ω·cm2 at 800 ℃, a 70.54% reduction compared to LSF (0.241 Ω·cm2). Single-cell tests further demonstrate a peak power density (PPD) of 852.65 mW·cm−2 for LSFN0.15 at 800 ℃, nearly twice that of the undoped counterpart (434.36 mW·cm−2). This study reveals the synergistic enhancement mechanisms of Ni doping in LSF-based cathode materials, highlighting the excellent potential of LSFN0.15 as a high-performance IT−SOFC cathode.
研究领域:
材料科学
·
电化学
·
能源技术
·
固体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Ziye Zhang,Deti Xie,Jiupai Ni,Chengsheng Ni
Ba 2 YCu 3 O 6+δ (BYC) is a prototypical superconducting oxide showing a superior mixed electronic and ionic conductivity at a temperature lower than 650 °C, but there is limited work on its possible application for low-temperature solid oxide fuel cells. Ba 2 MCu 3 O 6+δ (M = Y, Gd, Ho and Eu) oxides are studied as cathode materials for a proton-conducting solid oxide fuel cell (H–SOFC) and the polarization resistance ( R p ) reached around 0.29 Ω cm 2 at 650 °C in the ambient air, and the activation energy of R p was found to decrease with the electronegativity of the rare-earth element. Fe doping on Cu site of BYC has a negative effect on the electric conductivity of the oxide in the air but it enhances the electrochemical performance especially the power output of the full cell and structural stability under a slightly reducing atmosphere, e.g. pure Ar. The H–SOFC with BYC cathode showed a peak power of 175 mW cm −2 at 650 °C, which can be increased to 375 mW cm −2 by Fe doping on the Cu site as in Ba 2 YCu 2.6 Fe 0.4 O 6+δ .
研究领域:
材料科学
·
电化学
·
能源材料
·
固体化学
✓ 已验证
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2021
·
IF 4.724
Ping Li,Yimin Xuan,Biao Jiang,Shaowei Zhang,Changrong Xia
Symmetrical solid oxide electrolysis cells (Sym-SOECs) have emerged as one of the most attractive cells for direct CO 2 electrolysis owing to their structural advantages, low cost, and reversible operability. However, their practical applications are limited due to the non-availability of fuel electrode electrocatalysts with excellent performance. In this study, hollow La 0.6 Sr 0.4 Ni 0.2 Fe 0.75 Mo 0.05 O 3-δ (LSNFM) electrodes were prepared via a mild molten-salt-assisted approach. Subsequently, quasi-Sym-SOECs were constructed using LSNFM electrodes, where the cathode exsolved FeNi 3 nanoparticles to enhance CO 2 reduction performance. Compared with Sym-SOECs, the proposed quasi-Sym-SOECs show improved current density of electrolysis and reduced interfacial polarization resistance, which demonstrate the advantages of quasi-Sym-SOECs for CO 2 electrolysis.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jin Li,Xin Zhou,Congcong Wu,Li Zhao,Binghai Dong,Shimin Wang,Bo Chi
Challenged by the surface strontium (Sr) enrichment, long-term stability of the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) cathode remains to be the most intractable problem hindering its further development and application in solid oxide fuel cells (SOFCs). To enhance the durability and performance of LSCF-based electrodes, we propose a novel approach by introducing a highly active A-site deficient La 0.95 CoO 3-δ (LC95) thin film onto the surface of the porous LSCF scaffold, simultaneously working as the accepter for Sr diffusion and conformal collector for electrons conduction. Besides the inhibiting effect from the dense coating, the A-site deficiencies reserved in coating lattice enable promising stabilization for Sr diffusion and segregation. At 700 °C, the La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ @La 0.95 CoO 3-δ (LSCF@LC95) hybrid cathode shows a polarization resistance of 0.28 Ωcm 2 , much lower than that for pristine LSCF cathode (0.36 Ωcm 2 ). In addition to the higher electrochemical activity, single cell with LSCF@LC95 cathode exhibits remarkable long-term stability without detectable degradation over 120 h.
研究领域:
材料科学
·
电化学
·
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）