Preparation of 3D structure high performance Ba0·5Sr0·5Fe0·8Cu0·2O3-δ nanofiber SOFC cathode material by low-temperature calcination method

Bai, Jinghe; Han, Zhiying; Lv, Bu; Xu, Chen; Zhu, Xiaofei; Zhou, Defeng

doi:10.1016/j.ijhydene.2020.11.263

Cited by 43 publications

(25 citation statements)

References 40 publications

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“…On the contrary, the open-circuit voltage (OCV) value decreased with the temperature, and it was under the theoretical value of 1.04-1.1 V. This was because Ce 4+ in the electrolyte was reduced to Ce 3+ in part under a hightemperature reducing atmosphere, thereby forming a certain n-type conductivity. This phenomenon caused a short circuit inside the single cell [37,47,52]. The maximum power density of Cell-II was higher than Cell-I at 500-700 °C, which was consistent with the above R P value trend.…”

Section: Electrochemical Performance and Long-term Stability Of A Single Cellsupporting

confidence: 82%

“…The single cell performance was significantly enhanced. This result is higher than the previously reported Ba 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3-δ [37], Nd 0.5 Ba 0.5 Fe 0.9 Co 0.1 O 3-δ [41], Ln 0.5 Sr 0.5 Fe 0.8 Cu 0.2 O 3-δ (Ln = Pr, Nd, Sm, and Gd) [45], and Pr 0.6 Sr 0.4 Fe 0.8 Ni 0.2 O 3-δ [53]. Meanwhile, EIS curves were measured on Cell-I and Cell-II under OCV at 700 °C, as shown in Fig.…”

Section: Electrochemical Performance and Long-term Stability Of A Single Cellcontrasting

confidence: 72%

“…4a-b. According to the ) of the catalyst was tightly associated with surface oxygen vacancies and was active to reducing oxygen [36,37]. Therefore, an increase in surface oxygen content could improve ORR activity.…”

Section: X-ray Diffraction Photoelectron Spectroscopy Analysismentioning

confidence: 99%

“…The total resistance (R t ) is obtained from the corresponding low-frequency intercept. And the polarization resistance (R P ) is acquired by subtracting the two, which corresponds to the entire electrode resistance, including diffusion, adsorption, and transfer resistance [37]. To further clearly reflect the change of electrode response, R S was subtracted from EIS.…”

Section: Electrochemical Performance Of Symmetric Cellmentioning

confidence: 99%

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Novel cobalt and strontium-free perovskite Pr0.5Ba0.5Fe1-xNixO3-δ (x=0 and 0.2) as cathode for intermediate-temperature solid oxide fuel cells

Zhang

Chen

et al. 2021

Ionics

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The sol-gel method was adopted to synthesize novel cobalt and strontium-free Pr 0.5 Ba 0.5 Fe 1-x Ni x O 3-δ (x = 0 and 0.2, abbreviated as PBF and PBFN) perovskite oxides. It was aimed to discuss the influence of B-site Ni substitution on structure and electrochemical properties of Pr 0.5 Ba 0.5 FeO 3-δ . The results indicated that PBF-based oxides were both cubic perovskite structure. Ni atoms were successfully doped into the B sites of PBF, resulting in lattice shrinkage. Ni doping could enhance the oxygen reduction activity by increasing the surface oxygen content and the release of lattice oxygen to increase oxygen vacancies. At 700 °C, the cathodic polarization resistance of PBFN (0.0726 Ω•cm 2 ) was lower than PBF (0.122 Ω•cm 2 ), and the maximum power density (PPD) of PBFN (528.79 mW•cm −2 ) was higher than PBF (259.65 mW•cm −2 ). After 80 h polarization, the open-circuit voltage did not change significantly. Therefore, PBFN has the potential to be more suitable cathode material of IT-SOFCs.

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Section: Electrochemical Performance and Long-term Stability Of A Single Cellsupporting

confidence: 82%

Section: Electrochemical Performance and Long-term Stability Of A Single Cellcontrasting

confidence: 72%

Section: X-ray Diffraction Photoelectron Spectroscopy Analysismentioning

confidence: 99%

Section: Electrochemical Performance Of Symmetric Cellmentioning

confidence: 99%

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Novel cobalt and strontium-free perovskite Pr0.5Ba0.5Fe1-xNixO3-δ (x=0 and 0.2) as cathode for intermediate-temperature solid oxide fuel cells

Zhang

Chen

et al. 2021

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“…In recent years, single perovskite oxides with the mixed ionic-electronic conducting (MIECs) have been investigated as potential cathode materials for IT-SOFCs because of their high ionic and electronic conductivity, and outstanding catalytic activity for ORR at typical SOFC operation temperatures. [5][6][7] Among various perovskite oxides, Fe-based perovskite oxides are often referred as alternative cathode materials for SOFCs owning to theirs good electrocatalytic activity and chemical stability. For instance, peak power density values of BaFe 0.95 Sn 0.05 O 3-δ , BaFe 0.95 Pr 0.05 O 3-δ and PrBaFe 1.9 Zr 0.1 O 5 + δ cathodes are 1033, 688, and 1260 mW cm À 2 at 700 °C, respectively.…”

Section: Introductionmentioning

confidence: 99%

Highly Improved Electrochemical Performance of a Fe‐based Cathode by Introducing A‐site Cationic Deficiencies

Zhao

Zheng

2022

ChemistrySelect

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New Sr 0.5 Bi 0.5 FeO 3-δ (SBF) and Sr 0.5 Bi 0.45 FeO 3-δ (SB0.45F) oxides are systematically investigated as oxygen reduction cathodes for intermediate temperature solid oxide fuel cells. The SBF and SB0.45F samples have been discovered that form single-phase solid solutions while maintaining outstanding chemical stability with gadolinium-doped ceria (Gd 0.1 Ce 0.9 O 1.95 , GDC) even sintering at 1000 °C in air. The average thermal expansion coefficients (TECs) for SBF and SB0.45F are very similar to the electrolyte of GDC. XPS and iodometric titration results reveal that A-site deficient SB0.45F cathode possesses a high oxygen vacancy concentration, which can greatly enhance the electro-chemical performance of porous cathode. A low polarization resistance (R p ) is shown for the SB0.45F cathode based on a symmetrical cell test, obtained by electrochemical impedance spectroscopy (EIS). Additionally, the deconvolution results of the EIS test display that the ORR rate of the SB0.45F cathode should be jointly limited by the charge transfer processes and oxygen adsorption processes. The peak power output of a single solid oxide fuel cell (SOFC) equipped with the SB0.45F cathode reaches 0.77 W cm À 2 at 700 °C, about 1.75 times of SBF. These findings suggest that the Bi-deficient SB0.45F perovskite oxide is an outstanding catalyst for IT-SOFC.

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Electrochemical Impedance Spectroscopy of Core‐Shell Nanofiber Cathodes, with Ce_0.9Gd_0.1O_1.95 (Core) and Cu‐Doped La_0.6Sr_0.4MnO₃ (Shell), for Application in Solid Oxide Fuel Cells

2023

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Several core‐shell nanofiber electrodes are prepared through electrospinning and tested for application as intermediate‐temperature solid oxide fuel cell (IT‐SOFC) cathodes. The materials investigated are La0.6Sr0.4MnO3 (LSM), La0.6Sr0.4Cu0.1Mn0.9O3‐δ (LSCuM_1), and La0.6Sr0.4Cu0.2Mn0.8O3‐δ (LSCuM_2) perovskites, used at the shell side of the nanofibers. Ce0.9Gd0.1O1.95 (GDC10) fluorite is used as the core material. The electrochemical characterization of the core‐shell nanofiber electrodes is performed through electrochemical impedance spectroscopy (EIS). The EIS results are reported and discussed based on equivalent circuit modeling. The polarization resistance of the GDC10/LSM core‐shell nanofibers electrodes is RP∼4.5 Ω cm2 at 650 °C. Improvement is accomplished with GDC10/LSCuM_1 and GDC10/LSCuM_2 core‐shell nanofibers, with RP∼1.8 Ω cm2 and 1.7 Ω cm2 respectively at 650 °C. Post‐test SEM characterization is carried out, to ascertain possible degradation and identify the most promising shell perovskite.

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Preparation of 3D structure high performance Ba0·5Sr0·5Fe0·8Cu0·2O3-δ nanofiber SOFC cathode material by low-temperature calcination method

Cited by 43 publications

References 40 publications

Novel cobalt and strontium-free perovskite Pr0.5Ba0.5Fe1-xNixO3-δ (x=0 and 0.2) as cathode for intermediate-temperature solid oxide fuel cells

Novel cobalt and strontium-free perovskite Pr0.5Ba0.5Fe1-xNixO3-δ (x=0 and 0.2) as cathode for intermediate-temperature solid oxide fuel cells

Highly Improved Electrochemical Performance of a Fe‐based Cathode by Introducing A‐site Cationic Deficiencies

Electrochemical Impedance Spectroscopy of Core‐Shell Nanofiber Cathodes, with Ce_0.9Gd_0.1O_1.95 (Core) and Cu‐Doped La_0.6Sr_0.4MnO₃ (Shell), for Application in Solid Oxide Fuel Cells

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Preparation of 3D structure high performance Ba0·5Sr0·5Fe0·8Cu0·2O3-δ nanofiber SOFC cathode material by low-temperature calcination method

Cited by 43 publications

References 40 publications

Novel cobalt and strontium-free perovskite Pr0.5Ba0.5Fe1-xNixO3-δ (x=0 and 0.2) as cathode for intermediate-temperature solid oxide fuel cells

Novel cobalt and strontium-free perovskite Pr0.5Ba0.5Fe1-xNixO3-δ (x=0 and 0.2) as cathode for intermediate-temperature solid oxide fuel cells

Highly Improved Electrochemical Performance of a Fe‐based Cathode by Introducing A‐site Cationic Deficiencies

Electrochemical Impedance Spectroscopy of Core‐Shell Nanofiber Cathodes, with Ce0.9Gd0.1O1.95 (Core) and Cu‐Doped La0.6Sr0.4MnO3 (Shell), for Application in Solid Oxide Fuel Cells

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About

Electrochemical Impedance Spectroscopy of Core‐Shell Nanofiber Cathodes, with Ce_0.9Gd_0.1O_1.95 (Core) and Cu‐Doped La_0.6Sr_0.4MnO₃ (Shell), for Application in Solid Oxide Fuel Cells