Electrochemical topotactic oxidation of nonstoichiometric perovskites at ambient temperature

Nemudry, A. P.; Goldberg, E.L.; Aguirre, Myriam H.; Alario-Franco, M.Á.

doi:10.1016/s1293-2558(02)01313-4

Cited by 60 publications

(41 citation statements)

References 42 publications

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“…Following the above description, the charge upon O 2− insertion can be compensated either by a cationic redox reaction (electrons removed from MO* states) or by the oxidation of oxygen ions (electrons removed from pure O p states). Different charge compensation mechanisms can then be envisaged in the bulk of perovskites upon oxygen insertion, and we refer the readers to more detailed works on these phenomena [57,58]. When removing electron from pure O p states in the bulk, unstable oxyl species would be formed prior to stabilization by charge reorganization.…”

Section: Reactivity Of the Oxygen Species Formed Upon Oxidationmentioning

confidence: 99%

Factors Controlling the Redox Activity of Oxygen in Perovskites: From Theory to Application for Catalytic Reactions

Yang

Grimaud

2017

Catalysts

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Abstract:Triggering the redox reaction of oxygens has become essential for the development of (electro) catalytic properties of transition metal oxides, especially for perovskite materials that have been envisaged for a variety of applications such as the oxygen evolution or reduction reactions (OER and ORR, respectively), CO or hydrocarbons oxidation, NO reduction and others. While the formation of ligand hole for perovskites is well-known for solid state physicists and/or chemists and has been widely studied for the understanding of important electronic properties such as superconductivity, insulator-metal transitions, magnetoresistance, ferroelectrics, redox properties etc., oxygen electrocatalysis in aqueous media at low temperature barely scratches the surface of the concept of oxygen ions oxidation. In this review, we briefly explain the electronic structure of perovskite materials and go through a few important parameters such as the ionization potential, Madelung potential, and charge transfer energy that govern the oxidation of oxygen ions. We then describe the surface reactivity that can be induced by the redox activity of the oxygen network and the formation of highly reactive surface oxygen species before describing their participation in catalytic reactions and providing mechanistic insights and strategies for designing new (electro) catalysts. Finally, we give a brief overview of the different techniques that can be employed to detect the formation of such transient oxygen species.

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Section: Reactivity Of the Oxygen Species Formed Upon Oxidationmentioning

confidence: 99%

Factors Controlling the Redox Activity of Oxygen in Perovskites: From Theory to Application for Catalytic Reactions

Yang

Grimaud

2017

Catalysts

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“…The OH group in the bridging position is then discharged, thus recovering the catalyst. This mechanism also has special requirements, namely affinity for oxygen vacancies and structural stability in their presence, which restricts its applicability to a few materials classes among which are many perovskite (-like) oxides [195,196].…”

Section: The Mechanisms Of Oxygen Reduction On Perovskite Oxidesmentioning

confidence: 99%

Perovskite Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media

Risch

2017

Catalysts

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Abstract:Oxygen reduction is considered a key reaction for electrochemical energy conversion but slow kinetics hamper application in fuel cells and metal-air batteries. In this review, the prospect of perovskite oxides for the oxygen reduction reaction (ORR) in alkaline media is reviewed with respect to fundamental insight into activity and possible mechanisms. For gaining these insights, special emphasis is placed on highly crystalline perovskite films that have only recently become available for electrochemical interrogation. The prospects for applications are evaluated based on recent progress in the synthesis of perovskite nanoparticles. The review concludes with the current understanding of oxygen reduction on perovskite oxides and a perspective on opportunities for future fundamental and applied research.

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“…Overall reduction/oxidation processes can thus be accelerated as a result of long-range fast oxygen transport along microdomain walls, followed by slow diffusion over short distances within the domains. 19 Significant differences in the weight change characteristic occurred when STF40 ceramic specimens were heated up in atmospheres with or without the addition of low amounts of propane. Typical results of some measurements on the specimen discussed above -illustrated as changes in the oxygen deficiency (3 − δ) -are shown in Fig.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Propane gas sensing with high-density SrTi0.6Fe0.4O(3−δ) ceramics evaluated by thermogravimetric analysis

Meuffels

2007

Journal of the European Ceramic Society

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Electrochemical topotactic oxidation of nonstoichiometric perovskites at ambient temperature

Cited by 60 publications

References 42 publications

Factors Controlling the Redox Activity of Oxygen in Perovskites: From Theory to Application for Catalytic Reactions

Factors Controlling the Redox Activity of Oxygen in Perovskites: From Theory to Application for Catalytic Reactions

Perovskite Electrocatalysts for the Oxygen Reduction Reaction in Alkaline Media

Propane gas sensing with high-density SrTi0.6Fe0.4O(3−δ) ceramics evaluated by thermogravimetric analysis

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