Titanium-substituted ferrite perovskite: An excellent sulfur and coking tolerant anode catalyst for SOFCs

Cao, Zhiqun; Fan, Liangdong; Zhang, Guanghong; Shao, Kang; He, Chuanxin; Zhang, Qianling; Lv, Zhe; Zhu, Bin

doi:10.1016/j.cattod.2018.04.023

Cited by 29 publications

(18 citation statements)

References 47 publications

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“…[ 7 ] Furthermore, the metal NPs produced by ex‐solution are strongly bound to the host oxide and thus have excellent thermal and chemical stability. [ 8,9 ] Accordingly, thanks to these advantages, the ex‐solution process is now being applied in high‐temperature chemical and electrochemical applications, such as solid oxide fuel cells, [ 10 ] electrolyzers, [ 11 ] and oxidation catalysts. [ 12 ]…”

Section: Figurementioning

confidence: 99%

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

Jang

Kim

et al. 2020

Advanced Materials

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Supported catalysts, in which metal nanoparticles (NPs) are distributed on oxide supports, are widely used in a variety of industrial processes, including in catalysis, [1] sensing, [2] and renewable energy. [3] To improve the reactivity, costeffectiveness, and durability of catalysts, decreasing their particle size to ensure uniform dispersion on the support and to suppress their aggregation during operation, particularly at high temperatures (>500 °C) is of utmost importance. Thus far, not only conventional impregnation and coprecipitation approaches but also numerous new synthesis and dispersion techniques have been actively studied. [4] Recently, the spontaneous growth of metal NPs on the surface of a host oxide, called "ex-solution," has attracted much attention as a new route to obtain supported catalysts. [5] It is based on the phenomenon that certain cations in a complex oxide lattice selectively precipitate on the surface when the oxide is partially reduced at high temperatures. [6] In particular, when catalytically active and highly reducible transition metals are used as dopants, metal NPs can be uniformly dispersed on the oxide surface with only a single heat treatment. [7] Furthermore, the metal NPs produced by ex-solution are strongly bound to the host oxide and thus have excellent thermal and chemical stability. [8,9] Accordingly, thanks to these advantages, the ex-solution process is now being applied in high-temperature chemical and electrochemical applications, such as solid oxide fuel cells, [10] electrolyzers, [11] and oxidation catalysts. [12] However, the high-temperature heat treatment required to obtain ex-solved particles is a substantial barrier that significantly limits the use of this process in a wider range of applications. To achieve high catalytic reactivity, not only the metal particles but also the oxide support should have a large specific surface area, whereas at high temperatures, sintering between the oxide supports often occurs, deactivating the catalysts. Therefore, it is necessary to develop a strategy for activating the ex-solution process at a temperature low enough that the nanoscale oxide supports do not aggregate. In this regard, Irvine et al. proposed facilitating the extrusion of B-site cations The ex-solution phenomenon, a central platform for growing metal nanoparticles on the surface of host oxides in real time with high durability and a fine distribution, has recently been applied to various scientific and industrial fields, such as catalysis, sensing, and renewable energy. However, the high-temperature processing required for ex-solutions (>700 °C) limits the applicable material compositions and has hindered advances in this technique. Here, an unprecedented approach is reported for lowtemperature particle ex-solution on important nanoscale binary oxides. WO 3 with a nanosheet structure is selected as the parent oxide, and Ir serves as the active metal species that produces the ex-solved metallic particles. Importantly, Ir doping facilitates a phase transition ...

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Section: Figurementioning

confidence: 99%

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

Jang

Kim

et al. 2020

Advanced Materials

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“…To date, the existing data offer a wide range of perovskite anode materials with good performances in hydrocarbon fuels. The titanates (ATiO 3 ) [ 63 , 64 , 65 ], chromites (ACrO 3 ) [ 63 ], manganites (AMnO 3 ) [ 63 , 66 , 67 ], ferrites (AFeO 3 ) [ 63 , 68 , 69 ] and vanadates (AVO 3 ) [ 70 ] of alkaline earth metals (A = Ca, Sr, Ba) are the best studied perovskites. Among double perovskites, strontium molybdates with general formula Sr 2 MMoO 6 (M = Ni, Mg, Fe) have attracted particular interest over the last decade due to their ability to achieve the required combination of functional properties.…”

Section: Anode Materials For Sofcsmentioning

confidence: 99%

Undoped Sr2MMoO6 Double Perovskite Molybdates (M = Ni, Mg, Fe) as Promising Anode Materials for Solid Oxide Fuel Cells

et al. 2021

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The chemical design of new functional materials for solid oxide fuel cells (SOFCs) is of great interest as a means for overcoming the disadvantages of traditional materials. Redox stability, carbon deposition and sulfur poisoning of the anodes are positioned as the main processes that result in the degradation of SOFC performance. In this regard, double perovskite molybdates are possible alternatives to conventional Ni-based cermets. The present review provides the fundamental properties of four members: Sr2NiMoO6-δ, Sr2MgMoO6-δ, Sr2FeMoO6-δ and Sr2Fe1.5Mo0.5O6-δ. These properties vary greatly depending on the type and concentration of the 3d-element occupying the B-position of A2BB’O6. The main emphasis is devoted to: (i) the synthesis features of undoped double molybdates, (ii) their electrical conductivity and thermal behaviors in both oxidizing and reducing atmospheres, as well as (iii) their chemical compatibility with respect to other functional SOFC materials and components of gas atmospheres. The information provided can serve as the basis for the design of efficient fuel electrodes prepared from complex oxides with layered structures.

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“…[4,5] Ceramic-based materials such as perovskites and Ruddlesden-Popper structures are attractive candidates for replacing such Ni-based materials because of their several advantages such as redox stability and tolerance to carbon deposition and sulfur poisoning. [6][7][8] However, the relatively low catalytic activity and conductivity compared to nickel catalysts are the main limitations in using ceramic catalysts as SOFC anodes. [9,10] The formation of metal nanoparticles on the surface of ceramic materials is one of the effective ways to overcome their low catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Ruddlesden–Popper Oxide (La_0.6Sr_0.4)₂(Co,Fe)O₄ with Exsolved CoFe Nanoparticles for a Solid Oxide Fuel Cell Anode Catalyst

et al. 2021

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Herein, a new ceramic‐based catalyst with exsolved CoFe nanoparticles anchored on the support of a Ruddlesden–Popper structure (La1.2Sr0.8Co0.12Fe0.88O4) is synthesized, and various physicochemical analyses are conducted to investigate its applicability as an anode of solid oxide fuel cells (SOFCs). The catalyst is fabricated by reducing La0.6Sr0.4Co0.2Fe0.8O3 in an atmosphere of a 10% H2/N2 gas mixture at 800 °C, whose condition is much milder than the typical synthesis method of Ruddlesden–Popper materials. The single cell exhibits a good electrochemical performance with a maximum power density value of 729 mW cm−2 at a temperature of 800 °C. The presence of oxygen vacancies and the low synthesis temperature should be responsible for its good catalytic activity. Moreover, exsovled CoFe nanoparticles could provide additional chemisorption and activation sites for the H2 electrooxidation reaction, leading to the improved electrochemical performance. Therefore, this Ruddlesden–Popper material with exsolved CoFe nanoparticles could be a potential anode material for SOFCs.

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Titanium-substituted ferrite perovskite: An excellent sulfur and coking tolerant anode catalyst for SOFCs

Cited by 29 publications

References 47 publications

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

Undoped Sr2MMoO6 Double Perovskite Molybdates (M = Ni, Mg, Fe) as Promising Anode Materials for Solid Oxide Fuel Cells

Ruddlesden–Popper Oxide (La_0.6Sr_0.4)₂(Co,Fe)O₄ with Exsolved CoFe Nanoparticles for a Solid Oxide Fuel Cell Anode Catalyst

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Titanium-substituted ferrite perovskite: An excellent sulfur and coking tolerant anode catalyst for SOFCs

Cited by 29 publications

References 47 publications

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

Dopant‐Driven Positive Reinforcement in Ex‐Solution Process: New Strategy to Develop Highly Capable and Durable Catalytic Materials

Undoped Sr2MMoO6 Double Perovskite Molybdates (M = Ni, Mg, Fe) as Promising Anode Materials for Solid Oxide Fuel Cells

Ruddlesden–Popper Oxide (La0.6Sr0.4)2(Co,Fe)O4 with Exsolved CoFe Nanoparticles for a Solid Oxide Fuel Cell Anode Catalyst

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Ruddlesden–Popper Oxide (La_0.6Sr_0.4)₂(Co,Fe)O₄ with Exsolved CoFe Nanoparticles for a Solid Oxide Fuel Cell Anode Catalyst