Novel cobalt-free Pr2Ni1-Nb O4 (x = 0, 0.05, 0.10, and 0.15) perovskite as the cathode material for IT-SOFC

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

doi:10.1016/j.ijhydene.2021.01.045

Cited by 35 publications

(16 citation statements)

References 57 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: 81%

“…As displayed in the figure, the maximum power density (PPD) and current density of the single cell enhanced with the temperature. This could be attributed to the increase of oxygen ion transport rate and gas diffusion rate with the temperature [52]. 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.…”

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

confidence: 98%

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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: 81%

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

confidence: 98%

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 prepared GDC sample was polished to ∼300 μm as the electrolyte, and the cathode and the binder (6 wt % ethyl cellulose–terpineol) were mixed uniformly to obtain the cathode slurry; screen printing was used to symmetrically paint the cathode slurry on both sides of the GDC electrolyte; and a symmetrical cell (cathode|GDC|cathode) with an active area of 0.2 cm 2 was obtained by calcination at 800 °C for 2 h. Preparation of the anode support cell: the prepared cathode paste was screen-printed onto a commercial half-cell. The preparation of electrolyte-supported single cells was done following our previous works . The anode side of the SOFC was sealed with conductive glue (DAD-87) to one end of the corundum tube.…”

Section: Methodsmentioning

confidence: 99%

New SOFC Cathode: 3D Core–Shell-Structured La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ@PrO_2−δ Nanofibers Prepared by Coaxial Electrospinning

Bai

Zhou

Zhu

et al. 2022

ACS Appl. Energy Mater.

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3D core–shell La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF)@PrO2−δ nanofibers as a solid-oxide fuel cell (SOFC) cathode with excellent electrochemical properties are directly prepared by coaxial electrospinning. In the LSCF@PrO2−δ nanofibers, the low oxygen reduction reaction (ORR) activity of LSCF can be effectively ameliorated by heterogeneous PrO2−δ. Compared with the LSCF nanostructure, the LSCF@PrO2−δ nanofibers with a 3D core–shell heterostructure effectively suppress the segregation of Sr on the surface and improve the stability of the cathode. Due to the unique microstructure, large specific surface area, and porosity, the LSCF@PrO2−δ nanofibers provide a continuous path for charge transfer and extend the three-phase interface that help to improve the ORR activity of the SOFC cathode. At 700 °C, the area specific resistance of LSCF@PrO2−δ nanofibers reaches 0.076 Ω·cm2, which is reduced by 35 and 60%, compared with 0.117 Ω·cm2 of LSCF nanofibers and 0.192 Ω·cm2 of the LSCF powder. When LSCF@PrO2−δ nanofibers are used as a single-cell cathode, the peak power density reaches 1.17 W·cm–2 at 700 °C, and the voltage decay rate of the single cell is only 0.03% per hour after 100 h of long-term stability test. Therefore, the 3D core–shell LSCF@PrO2−δ nanofibers provide an alternative approach for obtaining the high-performance SOFC cathode.

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“…Electrode microstructure is one of the important factors affecting cell performance, which is closely related to material porosity and the three-phase interface (TPB) area (Han et al, 2021). The microstructure of the cathode material is shown in Figure 3A-E.…”

Section: Microstructure Analysismentioning

confidence: 99%

“…In the high-temperature range, the OCV was further reduced. This was due to the partial reduction of Ce 4+ to Ce 3+ in the high-temperature reduction atmosphere, and the GDC electrolyte had a certain n-type conductivity, resulting in the internal short circuit of the cell and the decrease of OCV value (Bai et al, 2021;Han et al, 2021). At 650-800 °C, the power densities of the three materials all followed the following order: PSFN 113 < PSFN 214 < PSFN 113-214 (5:5), which corresponded to the above-mentioned R P results.…”

Section: Single Cell Performancementioning

confidence: 99%

Heterointerface Effect in Accelerating the Cathodic Oxygen Reduction for Intermediate-Temperature Solid Oxide Fuel Cells

Zhu

Meng

et al. 2022

Front. Chem.

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A solid-state mixing method was adopted to prepare a new Pr0.8Sr0.2Fe0.7Ni0.3O3−δ-Pr1.2Sr0.8Fe0.4Ni0.6O4+δ (PSFN113-214) composite cathode oxide for the solid oxide fuel cells (SOFCs). Herein, heterointerface engineering was investigated for the performance enhancement. It was found that the oxygen vacancy content could be increased by mixing the PSFN214 with PSFN113, which gave rise to the formation of a heterostructure, and resulted in the promotion of oxygen ion transport as well as the specific surface area. The optimum mixing ratio 5:5 resulted in the highest oxygen vacancy content and the largest specific surface area, indicating the strongest interface effect. Polarization resistance of PSFN113-214 (5:5) was 0.029 Ω cm2 at 800°C, which was merely 24% of PSFN113 and 39% of PSFN214. The corresponding maximum power density was 0.699 W cm−2, which was nearly 1.44 times of PSFN113 and 1.24 times of PSFN214. Furthermore, the voltage attenuation rate after 100 h was merely 0.0352% h−1. Therefore, the new PSFN113-214 composite could be a prospective cathode oxide for SOFCs.

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Novel cobalt-free Pr2Ni1-Nb O4 (x = 0, 0.05, 0.10, and 0.15) perovskite as the cathode material for IT-SOFC

Cited by 35 publications

References 57 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

New SOFC Cathode: 3D Core–Shell-Structured La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ@PrO_2−δ Nanofibers Prepared by Coaxial Electrospinning

Heterointerface Effect in Accelerating the Cathodic Oxygen Reduction for Intermediate-Temperature Solid Oxide Fuel Cells

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Novel cobalt-free Pr2Ni1-Nb O4 (x = 0, 0.05, 0.10, and 0.15) perovskite as the cathode material for IT-SOFC

Cited by 35 publications

References 57 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

New SOFC Cathode: 3D Core–Shell-Structured La0.6Sr0.4Co0.2Fe0.8O3−δ@PrO2−δ Nanofibers Prepared by Coaxial Electrospinning

Heterointerface Effect in Accelerating the Cathodic Oxygen Reduction for Intermediate-Temperature Solid Oxide Fuel Cells

Contact Info

Product

Resources

About

New SOFC Cathode: 3D Core–Shell-Structured La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ@PrO_2−δ Nanofibers Prepared by Coaxial Electrospinning