A novel layered perovskite electrode for symmetrical solid oxide fuel cells: PrBa(Fe0.8Sc0.2)2O5+δ

He, Wei; Wu, Xuelian; Dong, Feifei; Ni, Meng

doi:10.1016/j.jpowsour.2017.07.059

Cited by 51 publications

(32 citation statements)

References 29 publications

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“…For instance, Fe in single perovskite oxides such as La1-xSrxFeO3-δ is liable to be reduced, resulting in the decomposition of the perovskite structure. 58 On the other hand, Fe cannot exsolve from double perovskites such as PrBaMn1.7Fe0.3O5+δ 36 and PrBa(Fe0.8Sc0.2)2O5+δ 59 during reduction. The density functional calculation results also reveal that the co-segregation energy of Fe-…”

Section: Powder Characterizationmentioning

confidence: 99%

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A-Site Ordered Double Perovskite with in Situ Exsolved Core–Shell Nanoparticles as Anode for Solid Oxide Fuel Cells

Hou

Yao

et al. 2019

ACS Appl. Mater. Interfaces

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A highly active anode material for solid oxide fuel cells resistant to carbon deposition is developed. Co-Fe co-doped La0.5Ba0.5MnO3-δ with a cubic-hexagonal heterogeneous stucture is synthesized through the pechini method. An A-site ordered double perovskite with Co0.94Fe0.06 alloyoxide core-shell nanoparticles on its surface is formed after reduction. The phase transition and the exsolution of the nanoparticles are investigated with X-ray diffraction, thermogravimetric analysis and high-resolution transmission electron microscope. The exsolved nanoparticles with the layered double perovskite supporter show a high catalytic activity. A single cell with that anode and a 300 μm-thick La0.8Sr0.2Ga0.8Mg0.2O3-δ electrolyte layer exhibits maximum power densities of 1479 and 503 mW cm -2 at 850 o C with wet hydrogen and wet methane fuels, respectively. Moreover, the single cell fed with wet methane exhibits a stable power output at 850 o C for 200 h, demonstrating a high resistance to carbon deposition of the anode due to the strong anchor of the exsolved nanoparticles on the perovskite parent. The oxide shell also preserves the metal particles from coking.

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Section: Powder Characterizationmentioning

confidence: 99%

“…4c and Table S4). single cells with various high-performance anodes at 850 o C. 25,34,38,59,68,[71][72][73][74] All of the anode layers in (c) were screen-printed on the electrolyte layers. The thicknesses of the anode layers were generally 30-40 μm, which were sintered at 950-1050 o C.…”

Section: Electrical Conductivitymentioning

confidence: 99%

A-Site Ordered Double Perovskite with in Situ Exsolved Core–Shell Nanoparticles as Anode for Solid Oxide Fuel Cells

Hou

Yao

et al. 2019

ACS Appl. Mater. Interfaces

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“…Particularly, a few Fe-based oxide materials have gained growing attention, which are perovskites of SrFeO 3 5 and BaFeO 3 6 and double perovskites of Sr 2 Fe 1.5 Mo 0.5 O 6−δ 7 and LnBaFe 2 O 5+δ (Ln = lanthanides). 8,9 In the LnBaFe 2 O 5+δ series, PrBaFe 2 O 5+δ (PBF) is primarily investigated as the electrocatalyst material for the oxygen reduction reaction. When single-phase PBF is used as the cathode, the area-specific cathode polarization resistance (R p,c ) is 0.18 Ω•cm 2 at 700 °C using Sm 0.2 Ce 0.8 O 1.9 (SDC) as the electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Tungsten-Doped PrBaFe₂O_5+δ Double Perovskite as a High-Performance Electrode Material for Symmetrical Solid Oxide Fuel Cells

Zhang

Wan

Hua

et al. 2021

ACS Appl. Energy Mater.

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Double perovskite PrBaFe 2 O 5+δ is a potential electrode material for symmetrical solid oxide fuel cells (Sym-SOFCs). This work aims to improve the Sym-SOFC performance by partially replacing Fe with W, forming a composition of (PrBa) 0.95 (Fe 0.95 W 0.05 ) 2 O 5+δ . Doping W keeps PrBaFe 2 O 5+δ stability after high-temperature treatment in both air and hydrogen atmospheres, decreases the thermal expansion coefficient from 17.11 × 10 −6 to 14.59 × 10 −6 K −1 , increases the content of oxygen species that are essential for the electrocatalytic reactions, and increases the chemical oxygen surface exchange coefficient by 121% at 800 °C. Consequently, doping W greatly improves the electrochemical performance, such as decreasing the areaspecific cathode polarization resistance by 35.5% to 0.031 Ω•cm 2 at 800 °C, reducing the anode polarization resistance by 17.7% to 0.123 Ω• cm 2 , and increasing the peak power density of Sym-SOFCs by 32.5% to 1.02 W cm −2 using humidified hydrogen as the fuel. The performance is much higher than those reported for Sym-SOFCs using PrBaFe 2 O 5+δ doped with the other elements. Finally, the Sym-SOFCs are capable of directly using hydrocarbon fuels, providing peak power densities of 0.610, 0.624, and 0.448 W cm −2 at 800 °C for syngas, ethane, and propane, respectively.

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“…The peak power density of the A-PBSF30 symmetrical cell is 1.23 W cm -2 at 800 o C with humidified H2 (3% H2O) as fuel. This outstanding cell performance is the highest out of open literature based on LSGM electrolytesupported S-SOFCs without any external catalysts at 800 o C under humidified H2 (3% H2O) as fuel to our best knowledge (Figure 4b and Table 1) 28,[39][40][41][42][43][44][45] . In addition, peak power outputs of 0.73 W cm -2 in humidified C3H8 (3% H2O) at 800 o C (Figure 4c and Supplementary Figure 15).…”

Section: Electrochemical Performance Evaluationmentioning

confidence: 70%

Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites

Kim

Lim

Kwon

et al. 2021

Preprint

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The exsolution of transition metals in perovskite oxides has been actively researched for intelligent catalyst design in energy-related applications. To significantly increase the amount of exsolved particles, the complete phase reconstruction from simple perovskite to Ruddlesden-Popper (R-P) perovskite is greatly desirable. However, a comprehensive understanding of key parameters affecting the phase reconstruction to R-P perovskite is still unexplored. Herein, the oxygen vacancy formation energies (Evf-O) from PrO and TO2 in Pr0.5(Ba/Sr)0.5TO3-δ (T = Mn, Fe, Co, and Ni) are proposed as the important factor in determining the type of phase reconstruction in perovskites. Furthermore, using in-situ temperature & environment-controlled X-ray diffraction measurements, we mapped out the phase diagram and found the optimum ‘x’ range required for the complete phase reconstruction to R-P perovskite (x ≥ 0.3) in Pr0.5Ba0.5-xSrxFeO3-δ (PBSF) system. Among PBSF, the (Pr0.5Ba0.2Sr0.3)2FeO4+δ – Fe metal (R-PBSF30) has the smallest size of exsolved Fe metal particles when the phase reconstruction occurs from simple perovskite under reducing condition. The exsolved nano-Fe metal particles exhibited high particle density and are well-distributed on the perovskite surface, showing great catalytic activity in fuel cell mode (1.23 W cm-2 at 800 oC) and high syngas production by co-electrolysis of CO2 and H2O (–1.62 A cm-2 at 1.5 V, 800 oC).

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A novel layered perovskite electrode for symmetrical solid oxide fuel cells: PrBa(Fe0.8Sc0.2)2O5+δ

Cited by 51 publications

References 29 publications

A-Site Ordered Double Perovskite with in Situ Exsolved Core–Shell Nanoparticles as Anode for Solid Oxide Fuel Cells

A-Site Ordered Double Perovskite with in Situ Exsolved Core–Shell Nanoparticles as Anode for Solid Oxide Fuel Cells

Tungsten-Doped PrBaFe₂O_5+δ Double Perovskite as a High-Performance Electrode Material for Symmetrical Solid Oxide Fuel Cells

Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites

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A novel layered perovskite electrode for symmetrical solid oxide fuel cells: PrBa(Fe0.8Sc0.2)2O5+δ

Cited by 51 publications

References 29 publications

A-Site Ordered Double Perovskite with in Situ Exsolved Core–Shell Nanoparticles as Anode for Solid Oxide Fuel Cells

A-Site Ordered Double Perovskite with in Situ Exsolved Core–Shell Nanoparticles as Anode for Solid Oxide Fuel Cells

Tungsten-Doped PrBaFe2O5+δ Double Perovskite as a High-Performance Electrode Material for Symmetrical Solid Oxide Fuel Cells

Unveiling the key factor for the phase reconstruction and exsolved metallic particle distribution in perovskites

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Tungsten-Doped PrBaFe₂O_5+δ Double Perovskite as a High-Performance Electrode Material for Symmetrical Solid Oxide Fuel Cells