Exsolution of nanoparticles on A-site-deficient lanthanum ferrite perovskites: its effect on co-electrolysis of CO<sub>2</sub> and H<sub>2</sub>O

“…The possible reason why H-LSCF has better catalytic activity is that it has more surface oxygen vacancies. It is because oxygen vacancy is an important place for the catalytic oxidation reaction. , The higher the oxygen vacancy concentrations, the more reactive sites that participate in the reaction, resulting in higher catalytic activity …”

Section: Resultsmentioning

confidence: 99%

“…50,51 The higher the oxygen vacancy concentrations, the more reactive sites that participate in the reaction, resulting in higher catalytic activity. 52 Figure 5a exhibit the EIS of the equivalent symmetrical cells under different H 2 partial pressures (P Hd 2 ) at 700 °C and thus provides a better understanding of the HOR process. The R o and R p of the cells are exhibited in Figure 5b,c.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Ping

Liu

Wei

et al. 2022

Ind. Eng. Chem. Res.

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Perovskite La0.5Sr0.5Co0.2Fe0.8O3 (LSCF) usually acts as both cathode and anode in a reversible solid oxide cell (RSOC). It is found that the traditional preparation method can be improved to reduce the particle size, increase the specific surface area, and enhance the oxygen vacancy concentration of LSCF, further improving its bifunctional electrocatalytic activity toward oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR). Compared with that of LSCF prepared by the traditional solid-state reaction method, the oxygen vacancy concentration of LSCF prepared by the hard-template method is increased. Moreover, the LSCF prepared by the hard-template method shows better catalytic activity for HOR and ORR. In addition, the rate-determining steps for HOR and ORR on the surface of LSCF prepared by the hard-template method are the charge transfer reaction and the reduction of oxygen atoms to O–, respectively. Furthermore, a single-component fuel cell and a reversible single-component cell composed of LSCF prepared by the hard-template method exhibit better performance for discharge and water electrolysis.

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“…The citric acid‐ethylenediaminetetraacetic acid (EDTA) complexation method was employed to prepare La 0.7 Sr 0.2 Ni 0.2 Fe 0.8 O 3 (LSNF), as previously reported [41a] . Stoichiometric amounts of metal‐nitrate salts were dissolved in 100 ml of deionized water.…”

Section: Methodsmentioning

confidence: 99%

Electrocatalytic Oxidative Coupling of Methane on NiFe Exsolved Perovskite Anode: Effect of Water

et al. 2023

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Oxidative coupling of methane (OCM) can be performed electrocatalytically by utilizing solid oxide cells, which provide a readily controlled oxygen supply through dense electrolytes. La0.7Sr0.2Ni0.2Fe0.8O3 (LSNF) perovskite is an effective anode for OCM. Its surface characteristics and electrocatalytic activity can be improved by reduction and the resultant exsolution of bimetallic NiFe nanoparticles from its bulk. X‐ray diffraction (XRD) and environmental transmission electron microscopy proved that the evolution of hetero‐phases under reducing environment resulted in bimetallic NiFe nanoparticles being formed on the surface. A 36 % improvement in C2+ hydrocarbon production rate was achieved due to the reduction of LSNF with the exsolved NiFe nanoparticles. Co‐feeding of H2O enhanced selective conversion of CH4 resulting in the production rate of C2+ hydrocarbons being increased by 56 %. Analysis of impedance spectra and in‐situ DRIFTS under a CH4+H2O atmosphere provided an understanding for the enhancement on the electrocatalytic OCM.

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Exsolution of nanoparticles on A-site-deficient lanthanum ferrite perovskites: its effect on co-electrolysis of CO₂ and H₂O

Abstract: La0.7Sr0.2Ni0.2Fe0.8O3 (LSNF), having thermochemical stability, superior ionic and electronic conductivity, and structural flexibility, was investigated as a cathode in SOECs.

Cited by 17 publications

References 75 publications

Bifunctional electrocatalysts Pr_0.5Sr_0.5Cr_0.1Fe_0.9−xNi_xO_3−δ (x = 0.1, 0.2) for the HOR and ORR of a symmetric solid oxide fuel cell

Bifunctional electrocatalysts Pr_0.5Sr_0.5Cr_0.1Fe_0.9−xNi_xO_3−δ (x = 0.1, 0.2) for the HOR and ORR of a symmetric solid oxide fuel cell

Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Electrocatalytic Oxidative Coupling of Methane on NiFe Exsolved Perovskite Anode: Effect of Water

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Exsolution of nanoparticles on A-site-deficient lanthanum ferrite perovskites: its effect on co-electrolysis of CO2 and H2O

Abstract: La0.7Sr0.2Ni0.2Fe0.8O3 (LSNF), having thermochemical stability, superior ionic and electronic conductivity, and structural flexibility, was investigated as a cathode in SOECs.

Cited by 17 publications

References 75 publications

Bifunctional electrocatalysts Pr0.5Sr0.5Cr0.1Fe0.9−xNixO3−δ (x = 0.1, 0.2) for the HOR and ORR of a symmetric solid oxide fuel cell

Bifunctional electrocatalysts Pr0.5Sr0.5Cr0.1Fe0.9−xNixO3−δ (x = 0.1, 0.2) for the HOR and ORR of a symmetric solid oxide fuel cell

Enhancing Bifunctional Electrocatalytic Activities of La0.5Sr0.5Co0.2Fe0.8O3 in Reversible Single-Component Cells

Electrocatalytic Oxidative Coupling of Methane on NiFe Exsolved Perovskite Anode: Effect of Water

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Product

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Exsolution of nanoparticles on A-site-deficient lanthanum ferrite perovskites: its effect on co-electrolysis of CO₂ and H₂O

Bifunctional electrocatalysts Pr_0.5Sr_0.5Cr_0.1Fe_0.9−xNi_xO_3−δ (x = 0.1, 0.2) for the HOR and ORR of a symmetric solid oxide fuel cell

Bifunctional electrocatalysts Pr_0.5Sr_0.5Cr_0.1Fe_0.9−xNi_xO_3−δ (x = 0.1, 0.2) for the HOR and ORR of a symmetric solid oxide fuel cell

Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells