A-site deficient chromite perovskite with in situ exsolution of nano-Fe: a promising bi-functional catalyst bridging the growth of CNTs and SOFCs

Sun, Yanping; Li, Jianhui; Wang, Meng-Ni; Hua, Bin; Li, Jian; Luo, Jing‐Li

doi:10.1039/c5ta03832d

Cited by 54 publications

(38 citation statements)

References 20 publications

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“…This product can be modulated by the placement of vacancies in the cation sublattice though the synthesis of A-site-deficient starting materials or by changing the fraction of exsolvable metal in the precursor. Indeed, many studies have shown that exsolution is more favorable from A-site deficient perovskites [16,[29][30][31]. Therefore, low-cation transport properties and lower oxygen partial pressures (pO 2 ) should favor internal nucleation.…”

Section: Recent Advancements In Exsolution Electrodesmentioning

confidence: 99%

Progress and Opportunities for Exsolution in Electrochemistry

Rosen

2020

Electrochem

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This perspective gives the reader a broad overview of the progress that has been made in understanding the physics of the exsolution process and its exploitation in electrochemical devices in the last five years. On the basis of this progress, the community is encouraged to pursue unreported and under-reported opportunities for the advancement of exsolution in electrochemical applications through new materials discovery.

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Section: Recent Advancements In Exsolution Electrodesmentioning

confidence: 99%

Progress and Opportunities for Exsolution in Electrochemistry

Rosen

2020

Electrochem

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“…Due to its low cost, high electrocatalytic activity, and good stability, more and more attention has been paid on in situ exsolved metallic Fe nanoparticles–structured perovskite oxide electrodes. [ 10 ]…”

Section: Figurementioning

confidence: 99%

Pr and Mo Co‐Doped SrFeO_3–δ as an Efficient Cathode for Pure CO₂ Reduction Reaction in a Solid Oxide Electrolysis Cell

Zhang

Zhao

et al. 2020

Energy Tech

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Carbon dioxide (CO 2) electrolysis via a solid oxide electrolysis cell (SOEC), simplified as CO 2 RR, is a significantly promising energy conversion technology, which can effectively convert greenhouse gas CO 2 to value-added chemical agent carbon monoxide (CO) by using renewable electricity with high efficiency. [1] A SOEC is usually consisted of an ion conducting electrolyte, an anode for O 2 generation, and a cathode for CO 2 electroreduction. [1a,1b] To make the technology available for commercial application, it is necessary to simultaneously enhance the electrocatalytic activity and stability of the cathode during the operation. The state-of-the-art Ni-based cathodes exhibit excellent electrochemical performance, [2] but suffer from performance degradation due to the aggregation and oxidation of Ni particles as well as carbon deposition at the elevated temperature. [3] Therefore, it is highly in need to develop alternative cathode materials with high electrocatalytic activity and good long-term stability for CO 2 RR application. In recent years, mixed ionic-electronic conducting (MIEC) perovskite oxides, such as strontium titanate (SrTiO 3)-based oxides and lanthanum chromate (LaCrO 3)-based oxides, have been explored as the potential cathode materials because these cathode materials have demonstrated excellent stability at the elevated temperature for directly electrolyzing CO 2 to CO without the addition of any safe gas (usually H 2 , CO, or H 2-CO mixture). [4] However, their performance is still insufficient for practical CO 2 RR application. Therefore, further modification still needs to be done to efficiently enhance the cathode performance to enable direct CO 2 electrolysis. It is well known that CO 2 is difficult to be directly reduced to CO because of its extremely high energy barrier for directly breaking C═O bond (%1.9 eV), and sufficient CO 2 adsorption and activation is an important prerequisite for direct CO 2 electroreduction via a SOEC. [5] Previous studies have revealed that the introduction of oxygen vacancies at the cathode surface could not only effectively accelerate the CO 2 chemical adsorption, but also significantly reduce the energy barrier of CO 2 dissociation, possibly facilitating the direct CO 2 RR. [6] Metallic nanoparticles have been commonly introduced into the perovskite oxide cathodes to effectively alter the electrocatalytic properties of the cathodes, and to significantly increase the concentration of oxygen vacancies, resulting in a remarkable improvement of CO 2 adsorption and activation. [4d,5b,7] Therefore, it is highly expected to construct metallic nanoparticles-decorated perovskite oxide cathodes for efficient CO 2 RR. Recently, metallic nanoparticles-structured perovskite oxide cathodes have been effectively generated in one step by the in situ exsolution method. [8] It is demonstrated that these in situ exsolved metallic nanoparticles can strongly facilitate CO 2 adsorption and C═O bond activation, reasonably

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“…By using the A‐site deficient La 0.4 Sr 0.4 TiO 3 , it is found that the extremely stable Ti cations can also exsolve as TiO 2 NPs on the surface of the perovskite scaffold . Consequently, A‐site deficiency has been the suggested choice to establish the metallic NPs decorated perovskite in the past decade …”

Section: Tailoring In Situ Exsolution To Enhance Perovskite Electrocamentioning

confidence: 99%

“…Our group investigated a series of (LaSr) 1− α (NiFe) x Cr 1− x O 3± δ perovskites as high‐performance SOFC anodes . First, we demonstrated that the in situ exsolution of Ni NPs could be promoted on (LaSr) 1− α Ni x Cr 1− x O 3± δ anodes in the presence of the A‐site deficiency .…”

Section: Tailoring In Situ Exsolution To Enhance Perovskite Electrocamentioning

confidence: 99%

Enhancing Perovskite Electrocatalysis of Solid Oxide Cells Through Controlled Exsolution of Nanoparticles

et al. 2017

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Perovskite oxides have received a great deal of attention as promising electrodes in both solid oxide fuel cells (SOFCs) and solid oxide electrolyzer cells (SOECs) because of their reasonable reactivity, impurity tolerance, and tunable properties. In particular, exploration is still required for improving perovskite electrodes, which normally suffer from slow kinetics in electrocatalysis. Experimental studies have led to the development of new classes of perovskites with advanced characteristics and electrode kinetics at technical levels. In parallel with those developments, achievements in theoretical and computational studies have led to substantial understanding, at the atomic level, of their physicochemical properties and electrocatalytic behaviors. Their chemical and structural flexibilities enable perovskites to accommodate most metallic elements without destroying their complex matrix structures, thereby delivering a pathway to engineer their catalytic properties. In this Minireview, recent advances in perovskite electrodes are introduced, and perovskites with exsolved nanoparticles are discussed as enhanced electrocatalytic materials.

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A-site deficient chromite perovskite with in situ exsolution of nano-Fe: a promising bi-functional catalyst bridging the growth of CNTs and SOFCs

Cited by 54 publications

References 20 publications

Progress and Opportunities for Exsolution in Electrochemistry

Progress and Opportunities for Exsolution in Electrochemistry

Pr and Mo Co‐Doped SrFeO_3–δ as an Efficient Cathode for Pure CO₂ Reduction Reaction in a Solid Oxide Electrolysis Cell

Enhancing Perovskite Electrocatalysis of Solid Oxide Cells Through Controlled Exsolution of Nanoparticles

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A-site deficient chromite perovskite with in situ exsolution of nano-Fe: a promising bi-functional catalyst bridging the growth of CNTs and SOFCs

Cited by 54 publications

References 20 publications

Progress and Opportunities for Exsolution in Electrochemistry

Progress and Opportunities for Exsolution in Electrochemistry

Pr and Mo Co‐Doped SrFeO3–δ as an Efficient Cathode for Pure CO2 Reduction Reaction in a Solid Oxide Electrolysis Cell

Enhancing Perovskite Electrocatalysis of Solid Oxide Cells Through Controlled Exsolution of Nanoparticles

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Product

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Pr and Mo Co‐Doped SrFeO_3–δ as an Efficient Cathode for Pure CO₂ Reduction Reaction in a Solid Oxide Electrolysis Cell