INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Yuan Li,Xu Zhang,Yanting Tian,Xueying Wu,Lei Wang,Jiping Zhu
The electrochemical performance of Ca 3 Co 4 O 9+δ (CCO) oxygen electrode with La 0.6 Sr 0.4 FeO 3-δ (LSF) interlayer in YSZ-based reversible solid oxide cells (RSOCs) was investigated in present work. Results proved that CCO oxygen electrode with LSF interlayer had a superior stability under alternating anodic and cathodic polarization . Both the polarization resistance and overpotential of the CCO electrode with LSF interlayer were significantly reduced compared to that with Ce 0.9 Gd 0.1 O 1.95 (GDC) interlayer, which confirmed the improvement of the redox reactivity of the oxygen electrode. The maximum power density of Ni-YSZ/YSZ/LSF/CCO fuel cell was 1276 mW cm −2 at 800 °C. An electrolysis current density of 1695 mA cm −2 was achieved at 1.5 V and 50% H 2 O. The hydrogen production rate of the electrolysis cell improved by 2 times than that with the GDC interlayer. Results made clear reliability of LSF as an interlayer in YSZ-based RSOCs.
研究领域:
材料科学
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能源工程
·
电化学
✓ 已验证
DOI
高影响因子
iScience
·
2024
·
IF 4.6
Rui Yang,Wanbin Lin,Yunjuan He,Manish Singh,Liangdong Fan
Solid oxide electrolysis cells hold unique Faraday efficiency and favored thermodynamic/kinetics for CO 2 reduction to CO. Perovskite oxide–based composite materials are promising alternatives to Ni-based cermet electrodes in SOECs. However, contrary results of the electrocatalytic activity over single-phase perovskite oxide exist and the rationale of the negative effect is not well revealed. In this work, two-phase perovskite materials with various complementary properties and unique interfaces are self-assembled, which was realized by “subtractive” defect-driven phase separation. The obtained heterostructure electrodes showed reduced performance over that of single-phase materials although the cyclic stability was improved. The main reasons for the performance degradation are the decrease of electrical conductivity, oxygen vacancy concentration while increasing the average valence state of B-site Fe cations, and electrode surface Sr aggregation. This work highlights the self-assembly method and insight into the rational design and synthesis of active electrodes/catalysts for CO 2 conversion in solid oxide cells.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
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
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电化学
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能源技术
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固体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 6
·3202-3210
·
IF 9.3
Wanbin Lin,Yihang Li,Manish Singh,Huibin Zhao,Rui Yang,Pei-Chen Su,Liangdong Fan
Reversible solid oxide cells (RSOCs) hold enormous potential for efficient direct CO2 reduction or CO oxidation in terms of exceptional faradic efficiency and high reaction kinetics. The identification of an active fuel electrode is highly desirable for enhancing the performance of RSOCs. This study explores the use of a alkaline metal dopant (Na) to modify the perovskite oxide of Na2x(La0.6−xSr0.4−x)FeO3−δ (2x = 0, 0.10, 0.20) materials with powerful CO2 chemical adsorption capacity, high oxygen ion conductivity, and low average valence of Fe sites for CO2/CO redox reactions. The experimental results indicate that the cells with the NaLSF0.10 fuel electrode achieve a current density of 1.707 A cm−2 at 1.5 V/800 °C and excellent stability over 120 hours at 750 °C for pure CO2 electrolysis, approximately 33.4% improvement over the pristine sample. When operated under a mixed CO–CO2 atmosphere under RSOC mode, the cell outputs the performance of 1.589 A cm−2 at 1.5 V and 329 mW cm−2 at 800 °C, and demonstrates relatively durable operation over 25 cycles. The addition of low valence sodium ions with high basicity and low electronegativity reduces the oxygen vacancy formation energy, increases the concentration of oxygen vacancies and modifies the electronic structure of LSF, thus enhancing CO2 adsorption, dissociation processes and charge transfer steps as corroborated by the detailed experimental analysis. Combined with the acceptable anti-carbon deposition capability, we prove here a feasible strategy and provide new insights into designing novel electrodes for SOEC/RSOCs to effectively convert CO2 with potential for renewable energy storage.
研究领域:
材料科学
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电化学
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能源存储
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固体氧化物燃料电池
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhi Yang,Jian Zhang,Bingxue Wu,Xin Zhao,Xuanlin Lu,Yicheng Zhao,Yongdan Li
The oxygen reduction reaction at the cathode is an essential process for protonic ceramic fuel cells . Composite cathode materials are commonly used towards the multiple requirements including high surface oxygen activity as well as sufficient electronic and ionic conductivities . In this study, a cobalt-free composite cathode composed of a perovskite La 0.6 Sr 0.4 FeO 3-δ phase and a Ruddlesden-Popper La 1.2 Sr 0.8 NiO 4+δ phase is synthesized with a self-assembly technology. The cathode process is mainly controlled by (I) the reduction of adsorbed oxygen atom to O − on the surface and (II) the migration of O − from the surface into the lattice. The former benefits from the high electrical conductivity of La 0.6 Sr 0.4 FeO 3-δ , and the latter is accelerated by La 1.2 Sr 0.8 NiO 4+δ attributed to its superior oxygen activity. The one-pot synthesized composite cathode shows an enhanced synergistic effect due to the uniform distribution of the two phases at the nanoscale. The cathode shows the lowest polarization resistances of 0.055 and 0.095 Ω cm 2 at 700 °C in oxygen and air, respectively. The results show that self-assembled La 0.6 Sr 0.4 FeO 3-δ -La 1.2 Sr 0.8 NiO 4+δ nanocomposite is a promising cathode material for protonic ceramic fuel cells.
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
Materials
·
2020
·Vol. 13
·期 10
·2267
·
IF 3.057
Xiaodong Zuo,Zhiyi Chen,Chengzhi Guan,Kongfa Chen,Sanzhao Song,Guoping Xiao,Yuepeng Pang,Jian-Qiang Wang
Nanoscale perovskite oxides with enhanced electrocatalytic activities have been widely used as oxygen electrodes of reversible solid oxide cells (RSOC). Here, La0.6Sr0.4FeO3−δ(LSF) nanoscale powder is synthesized via a novel molten salt method using chlorides as the reaction medium and fired at 850 °C for 5 h after removing the additives. A direct assembly method is employed to fabricate the LSF electrode without a pre-sintering process at high temperature. The microstructure characterization ensures that the direct assembly process will not damage the porosity of LSF. When operating as a solid oxide fuel cell (SOFC), the LSF cell exhibits a peak power density of 1.36, 1.07 and 0.7 W/cm2at 800, 750 and 700 °C, respectively, while in solid oxide electrolysis cell (SOEC) mode, the electrolysis current density reaches 1.52, 0.98 and 0.53 A/cm2under an electrolysis voltage of 1.3 V, respectively. Thus, it indicates that the molten salt routine is a promising method for the synthesis of highly active perovskite LSF powders for directly assembled oxygen electrodes of RSOC.Keywords:reversible solid oxide fuel cell;molten salt synthesis;interface;LSF oxygen electrode;direct assembly
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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