Coke formation during high-temperature CO2 electrolysis over AFeO3 (A = La/Sr) cathode: Effect of A-site metal segregation

Deka, Dhruba J.; Kim, Jaesung; Gündüz, Seval; Jain, Dheeraj; Shi, Yingjie; Miller, Jeffrey T.; Co, Anne C.; Ozkan, Umit S.

doi:10.1016/j.apcatb.2020.119642

Cited by 66 publications

(42 citation statements)

References 52 publications

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“…Such hetero-phases other than the metal nanoparticles can have added effect-over the catalytic performance of the materials, and surprisingly, this issue has not been addressed yet in the literature. In our earlier publications, we have reported an A-site deficient La 0.7 Sr 0.2 FeO 3 perovskite with Ni and Co as dopants at the B-site that showed high activity for co-electrolysis of H 2 O and CO 2 to produce synthesis gas (H 2 + CO) with controllable H 2 /CO ratio [36][37][38]. A subsequent publication also showed that the Ni-doped variant La 0.7 Sr 0.2 Ni 0.2 Fe 0.8 O 3 (LSNF) has a much higher activity for hydrogen production from H 2 O electrolysis with lower cell voltage and impedance than the La 0.7 Sr 0.2 FeO 3 cathode [39].…”

Section: Introductionmentioning

confidence: 99%

Investigation of hetero-phases grown via in-situ exsolution on a Ni-doped (La,Sr)FeO3 cathode and the resultant activity enhancement in CO2 reduction

Deka

Kim

Gündüz

et al. 2021

Applied Catalysis B: Environmental

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Section: Introductionmentioning

confidence: 99%

Investigation of hetero-phases grown via in-situ exsolution on a Ni-doped (La,Sr)FeO3 cathode and the resultant activity enhancement in CO2 reduction

Deka

Kim

Gündüz

et al. 2021

Applied Catalysis B: Environmental

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“…28 In addition, the perovskite structure induces Sr enrichment or segregation accompanied by more oxygen vacancies, resulting in the formation of Sr species such as SrO at the perovskite surface. 26,29 The presence of numerous oxygen vacancies promotes surface oxygen adsorption, which improves the surface oxygen exchange rate; consequently, this behavior has been observed and studied in various fields, especially for application in CO oxidation, solid oxide fuel cells, and Li O 2 batteries. [30][31][32][33][34] Therefore, the selection of the appropriate A-site cation and its composition ratio is essential for tuning the catalytic activity of perovskite oxides.…”

Section: Introductionmentioning

confidence: 99%

Kinetic insight into perovskite La_0.8Sr_0.2VO₃ nanofibers as an efficient electrocatalytic cathode for high‐rate LiO₂ batteries

Sung

Lee

Kim

2021

InfoMat

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Efficient electrocatalysis at the cathode is essential for overcoming the limitations of Li O 2 batteries such as poor stability and low rate capability. Herein, we systematically studied the kinetic behavior of a Li O 2 battery comprising perovskite La 0.8 Sr 0.2 VO 3 nanofibers formed by partial Sr-cation doping and V cations with multiple oxidation states. Compared with undoped LaVO 3 and La 0.8 Sr 0.2 VO 4 nanofibers, perovskite La 0.8 Sr 0.2 VO 3 nanofibers exhibited an improved capacity of 2000 mA g À1 , and a 20-times-longer cycle life in Li O 2 batteries. X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and photoluminescence analyses revealed that the performance variations mainly originated from crystal defects, which modulate oxygen reduction/evolution kinetics. Through in situ Raman analysis, we showed that these structural defects are closely related to the oxygen reduction/evolution behavior of La 0.8 Sr 0.2 VO 3 nanofibers and result in fewer parasitic reactions.This study offers insights into the potential rate capability of Li O 2 batteries and related devices.

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“…By fitting the spectra, there are three peaks corresponding to three different oxygen species. In detail, the first peak at 532.3 eV can be ascribed to surface hydroxides/adsorbed water molecules (labeled as O–H), binding energy at 531.1 eV corresponds to the chemisorbed oxygen (correlated with surface oxygen vacancies labeled as O ads ), and the third peak at 529.1 eV can be classified as the lattice oxygen ions (labeled as O latt ). The percentage of O ads seems to increase with a decrease in Pr content, indicating that the reduction of Pr content is conducive to the generation of more oxygen vacancies .…”

Section: Resultsmentioning

confidence: 99%

The Performance of Ruddlesden–Popper (R-P) Structured Pr_2–xSr_xNi_0.2Mn_0.8O₄ for Reversible Single-Component Cells

Ping

Dong

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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In view of high catalytic activity and oxygen vacancy concentration, Ruddlesden−Popper (R-P) structure oxide has been widely used as the electrode material for solid oxide fuel cells (SOFCs). Herein, three R-P structure oxides, Pr 2−x Sr x Ni 0.2 Mn 0.8 O 4 (x = 1, 1.2, and 1.5), are used as the semiconductor materials of single-component cells. The materials for the oxygen side are hybrid oxides consisting of R-P structure oxide and perovskite oxide. The hydrogen side was exposed to the reduction atmosphere before the test, and the perovskite structure disappeared and the lattice parameters of the R-P structure changed, resulting in the formation of a new R-P structure and MnO 2 or NiMn alloy. In addition, Pr 0.5 Sr 1.5 Ni 0.2 Mn 0.8 O 4 and reduced Pr 0.5 Sr 1.5 Ni 0.2 Mn 0.8 O 4 exhibit the most content of oxygen vacancy. For a single-component fuel cell (SCFC), the cell performance increased with the decrease in Pr content. The SCFC composed of Pr 0.5 Sr 1.5 Ni 0.2 Mn 0.8 O 4 shows the highest maximum power densities (P max ), which reached 206.6 mW cm −2 at 700 °C. It is because the reduced Pr 0.5 Sr 1.5 Ni 0.2 Mn 0.8 O 4 has the highest catalytic activity for hydrogen oxidation reaction (HOR). Furthermore, the P max at 700 °C can reach a value of 198.1 mW cm −2 in SOFC mode, and in the case of SOEC mode, the current density at 700 °C is as high as −390.8 mA cm −2 with an applied electrolysis voltage of 1.3 V for the reversible single-component cell (RSCC) with Pr 0.5 Sr 1.5 Ni 0.2 Mn 0.8 O 4 as the semiconducting electrocatalyst.

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Coke formation during high-temperature CO2 electrolysis over AFeO3 (A = La/Sr) cathode: Effect of A-site metal segregation

Cited by 66 publications

References 52 publications

Investigation of hetero-phases grown via in-situ exsolution on a Ni-doped (La,Sr)FeO3 cathode and the resultant activity enhancement in CO2 reduction

Investigation of hetero-phases grown via in-situ exsolution on a Ni-doped (La,Sr)FeO3 cathode and the resultant activity enhancement in CO2 reduction

Kinetic insight into perovskite La_0.8Sr_0.2VO₃ nanofibers as an efficient electrocatalytic cathode for high‐rate LiO₂ batteries

The Performance of Ruddlesden–Popper (R-P) Structured Pr_2–xSr_xNi_0.2Mn_0.8O₄ for Reversible Single-Component Cells

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Coke formation during high-temperature CO2 electrolysis over AFeO3 (A = La/Sr) cathode: Effect of A-site metal segregation

Cited by 66 publications

References 52 publications

Investigation of hetero-phases grown via in-situ exsolution on a Ni-doped (La,Sr)FeO3 cathode and the resultant activity enhancement in CO2 reduction

Investigation of hetero-phases grown via in-situ exsolution on a Ni-doped (La,Sr)FeO3 cathode and the resultant activity enhancement in CO2 reduction

Kinetic insight into perovskite La0.8Sr0.2VO3 nanofibers as an efficient electrocatalytic cathode for high‐rate LiO2 batteries

The Performance of Ruddlesden–Popper (R-P) Structured Pr2–xSrxNi0.2Mn0.8O4 for Reversible Single-Component Cells

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Resources

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Coke formation during high-temperature CO2 electrolysis over AFeO3 (A = La/Sr) cathode: Effect of A-site metal segregation

Kinetic insight into perovskite La_0.8Sr_0.2VO₃ nanofibers as an efficient electrocatalytic cathode for high‐rate LiO₂ batteries

The Performance of Ruddlesden–Popper (R-P) Structured Pr_2–xSr_xNi_0.2Mn_0.8O₄ for Reversible Single-Component Cells