In Situ Exsolved NiFe/(NiFe)O<sub><i>x</i></sub> Core–Shell-Structured Nanocatalysts on Perovskite Anode with Enhanced Coking Resistance

Yang, Hongyu; La, Ming; Wang, Ziming; Tan, Ting; Mingxia, Qin; Hu, Junhua; Yang, Chenghao

doi:10.1021/acssuschemeng.2c01024

Cited by 6 publications

(2 citation statements)

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“…The metallic phase, which can be well identified as an Fe–Ni alloy (JCPDS 65-3244), can form a solid solution with a floating content of Fe and Ni. The metal ions may nucleate at a subnanometer size on the surface or inside the parent perovskite and then migrate to the surface. ,,− The crystal structure of the RP phase Sr 3 FeMoO 7−δ consists of perovskite Sr(Fe 0.5 Mo 0.5 )O 3−δ layers and rock salt (SrO) layers being stacked alternately along the c -axis. ,− This highly organized two-dimensional intercalated structure effectively enhances its thermal stability and facilitates the rapid transmission of oxygen species. Additionally, it is found that thermodynamically stable RP structure of Sr 3 FeMoO 7−δ with nanocatalyst decoration also exhibited improved electrochemical performance .…”

Section: Resultsmentioning

confidence: 99%

Ni-Substituted Sr₂FeMoO_6−δ as an Electrode Material for Symmetrical and Reversible Solid-Oxide Cells

Yang,

Li,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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This work develops a novel perovskite Sr 2 FeNi 0.35 Mo 0.65 O 6−δ (SFN 0.35 M) simultaneously using as a fuel electrode and oxygen electrode in a reversible solid oxide cell (RSOC). SFN 0.35 M shows outstanding electrocatalytic activity for hydrogen oxidation, hydrogen evolution, oxygen reduction, and oxygen evolution. In situ exsolution and dissolution of Fe−Ni alloy nanoparticles in SFN 0.35 M is revealed. In a reducing atmosphere, SFN 0.35 M shows in situ exsolution of Fe−Ni alloy nanoparticles, and then the Fe−Ni alloy is reoxidized into SFN 0.35 M while converting into an oxidizing atmosphere. The polarization resistances of SFN 0.35 M electrode are 0.043 Ω cm 2 in 20% O 2 − N 2 and 0.064 Ω cm 2 in H 2 at 850 °C. Moreover, symmetric fuel cells using the SFN 0.35 M electrode achieves a maximum power density of 0.501 W cm −2 at 850 °C in H 2 fuel, while the symmetric electrolysis cell has an electrolysis current density of 0.794 A cm −2 at 1.29 V in 90% H 2 O−10% H 2 at 850 °C. It is the first time we demonstrate that the cell voltage of symmetrical cell at 0.5 A cm −2 in the fuel cell mode and −0.5 A cm −2 in the electrolysis cell mode can be fully recovered in 10 electrode alternating cycles and therefore demonstrate the possibility that SFN 0.35 M can be used in a fully symmetric RSOC stack with electrode alternating functions.

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Section: Resultsmentioning

confidence: 99%

Ni-Substituted Sr₂FeMoO_6−δ as an Electrode Material for Symmetrical and Reversible Solid-Oxide Cells

Yang,

Li,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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“…79,80 NiFe alloy exsolution materials also have the potential for direct hydrocarbon SOFCs. 81,82 For example, Sun et al 83 reported that NiFe alloy nanoparticles exsolved from A-sitedeficient LaSrCrO 3 perovskite systems had better coking tolerance and fuel oxidation properties than single-metal Ni or Fe exsolution catalysts.…”

Section: Exsolution Catalysts For Energy Applicationsmentioning

confidence: 99%

Emerging Exsolution Materials for Diverse Energy Applications: Design, Mechanism, and Future Prospects

et al. 2023

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Nanostructured catalytic materials are considered to be a favorable design concept for various energy conversion and storage systems. Nanosized metal catalysts supported on oxide scaffolds have been adopted in numerous fields, including fuel cells, gas sensors, and chemical reforming devices. Nevertheless, nanometal catalysts often suffer from durability issues. Although surface-decorated nanometal catalysts can deliver sufficient catalytic activity, some of them still exhibit durability issues in severe operating environments. Recently, nanocatalysts produced by in situ exsolution have been demonstrated to overcome the practical limitations of conventional nanometal catalysts. The exsolution is defined as a process in which a catalytically active dopant in perovskite oxide is exsolved on its surface as highly dispersed nanometal catalysts. In particular, exsolution nanocatalysts embedded on perovskite oxides exhibit higher nanoparticle densities and greater resistance to particle agglomeration than conventional nanometal catalysts. This Perspective presents an overview of recent advances in exsolution materials for energy applications including fundamental mechanisms, design strategies for host oxides, and practical applications. The future prospects of these materials and the scope for further optimization are also discussed.

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Boosting the Performance and Stability of Perovskites by Construction of NiFe Alloy and PrO_x Heterogeneously Structured Composites for High‐Performance Solid Oxide Fuel Cell Anode

Yi,

Xi,

Huang

et al. 2024

Adv Funct Materials

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Sr2Fe1.5Mo0.5O6‐δ (SFM) perovskite oxide is one of the most promising materials for solid oxide fuel cells (SOFCs) anode. However, the low catalytic activity is a major roadblock that obstructs its practical applications. Although in situ exsolution of B‐site metals is demonstrated as a promising approach to enhancing its performance, it can easily induce the co‐segregation of A‐site Sr, which seriously deteriorates the performance stability. In this work, the A‐site Sr element in SFM is partially replaced by Pr, while B‐site Mo is partially replaced by Ni. The in situ co‐exsolution of both FeNi alloy and PrOx nanoparticles on the reduced Pr0.8Sr1.2Fe1.5Mo0.3Ni0.2O6‐δ (R‐PSFMN) perovskite is successfully achieved. It is found that the peak power densities (Pmax) of the single cell using R‐PSFMN as the anode reaches as high as 2.29, 1.60, 1.07, and 0.67 W cm−2 in H2 atmosphere at the operating temperatures of 850, 800, 750 and 700 °C, respectively. Furthermore, it also exhibits excellent performance stability and anticoke properties when using ethane as fuel. The impregnation experiment further corroborates that the improved performance and stability are partly attributable to the contribution of PrOx nanoparticles, presenting a promising approach to enhance the electrochemical performance of SOFC perovskite anodes.

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In Situ Exsolved NiFe/(NiFe)O_x Core–Shell-Structured Nanocatalysts on Perovskite Anode with Enhanced Coking Resistance

Cited by 6 publications

References 50 publications

Ni-Substituted Sr₂FeMoO_6−δ as an Electrode Material for Symmetrical and Reversible Solid-Oxide Cells

Ni-Substituted Sr₂FeMoO_6−δ as an Electrode Material for Symmetrical and Reversible Solid-Oxide Cells

Emerging Exsolution Materials for Diverse Energy Applications: Design, Mechanism, and Future Prospects

Boosting the Performance and Stability of Perovskites by Construction of NiFe Alloy and PrO_x Heterogeneously Structured Composites for High‐Performance Solid Oxide Fuel Cell Anode

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In Situ Exsolved NiFe/(NiFe)Ox Core–Shell-Structured Nanocatalysts on Perovskite Anode with Enhanced Coking Resistance

Cited by 6 publications

References 50 publications

Ni-Substituted Sr2FeMoO6−δ as an Electrode Material for Symmetrical and Reversible Solid-Oxide Cells

Ni-Substituted Sr2FeMoO6−δ as an Electrode Material for Symmetrical and Reversible Solid-Oxide Cells

Emerging Exsolution Materials for Diverse Energy Applications: Design, Mechanism, and Future Prospects

Boosting the Performance and Stability of Perovskites by Construction of NiFe Alloy and PrOx Heterogeneously Structured Composites for High‐Performance Solid Oxide Fuel Cell Anode

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Product

Resources

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In Situ Exsolved NiFe/(NiFe)O_x Core–Shell-Structured Nanocatalysts on Perovskite Anode with Enhanced Coking Resistance

Ni-Substituted Sr₂FeMoO_6−δ as an Electrode Material for Symmetrical and Reversible Solid-Oxide Cells

Ni-Substituted Sr₂FeMoO_6−δ as an Electrode Material for Symmetrical and Reversible Solid-Oxide Cells

Boosting the Performance and Stability of Perovskites by Construction of NiFe Alloy and PrO_x Heterogeneously Structured Composites for High‐Performance Solid Oxide Fuel Cell Anode