Effect of La doping on the electrochemical activity of double perovskite oxide Sr2FeMoO6 in alkaline medium

Azizi, F.; Kahoul, A.; Azizi, A.

doi:10.1016/j.jallcom.2009.04.143

Cited by 22 publications

(11 citation statements)

References 30 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indeed, noble metals and their alloys and oxides, such as Pt, Pt alloys, IrO 2 , and RuO 2 , are the state-of-the-art catalysts for oxygen catalysis. − ,− However, the high price and the element scarcity hinder their scalable applications. Recently, perovskite oxide (ABO 3 ) comes into view in a range of electrochemical devices as a high-performance, low-cost catalyst. − ,,,,− In particular, the double perovskite oxide has shown excellent performance–cost balance and is recognized as an ideal substitute of precious metals in oxygen electrocatalysis. ,− Kahoul reported that the Sr 1.5 La 0.5 FeMoO 6 double perovskite exhibited the best electrocatalytic activity for both ORR and OER among the Sr 2– x La x FeMoO 6 ( x = 0, 0.25, 0.5, and 1) series . The Shao-Horn’s group found that the double perovskite LnBaCo 2 O 5+δ (Ln = Pr, Sm, Gd, and Ho) family was highly active and stable for OER in alkaline conditions .…”

Section: Introductionmentioning

confidence: 99%

“…16,18−21 Kahoul reported that the Sr 1.5 La 0.5 Fe-MoO 6 double perovskite exhibited the best electrocatalytic activity for both ORR and OER among the Sr 2−x La x FeMoO 6 (x = 0, 0.25, 0.5, and 1) series. 21 The Shao-Horn's group found that the double perovskite LnBaCo 2 O 5+δ (Ln = Pr, Sm, Gd, and Ho) family was highly active and stable for OER in alkaline conditions. 18 We also investigated a series of double perovskites, NdBa 0.75 Ca 0.25 Co x Fe 2−x O 5+δ (x = 2, 1.5, 1, 0.5), as promising ORR catalysts.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stabilizing Double Perovskite for Effective Bifunctional Oxygen Electrocatalysis in Alkaline Conditions

et al. 2017

View full text Add to dashboard Cite

Oxygen electrocatalysis is at the heart of the emerging energy conversion and storage devices including reversible fuel cells and metal-air batteries. However, replacing the noble-metal-based oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts with affordable and robust alternatives remains challenging to date. Herein, we report a cation-ordered double perovskite oxide, i.e., PrBa 0.85-Ca 0.15 MnFeO 5+δ , with excellent stability and activity in both OER and ORR. The layered crystal structure provides ordered oxygen vacancy channels and a vast amount of surface oxygen defects, while the moderate amount of iron dopant keeps the B-site cations at high oxidation state with optimal e g fillings. Importantly, the DFT calculations along with the advanced TEM analysis verify that the incorporation of Ca at the A-site stabilizes the perovskite structure under potential bias. Such a bifunctional catalyst shows comparable, if not better, activity relative to the state-of-the-art perovskite oxides (e.g., Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−δ) while demonstrating remarkably enhanced robustness. This work presents a rational approach of designing efficient, robust, and cost-effective perovskite oxide for oxygen electrocatalysis and sheds light on the influences of the crystallographic structure on the catalytic property.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stabilizing Double Perovskite for Effective Bifunctional Oxygen Electrocatalysis in Alkaline Conditions

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Most of the recent studies on perovskite ORR activity in alkaline media utilize carbon as a second electrode component with the aim of eliminating any possible concern about perovskite particle electronic connection. ,,− Different carbons such as high surface area Vulcan XC 72 , or Ketjen black, and lower surface area Acetylene black ,, or Super P carbons have been used in combination with perovskite catalysts, generally in an oxide to carbon weight ratio range between 5:1 and 1:1. However, even carbons with relative low surface area, such as Acetylene black or Super P, possess a significantly higher BET surface area compared to that of perovskite powders and remarkable activity toward ORR in alkaline media .…”

Section: Introductionmentioning

confidence: 99%

“…However, even carbons with relative low surface area, such as Acetylene black or Super P, possess a significantly higher BET surface area compared to that of perovskite powders and remarkable activity toward ORR in alkaline media . If we consider a low surface area carbon such as Acetylene black (about 80–100 m 2 g –1 ) and a perovskite oxide with an average surface area of about 10 m 2 g –1 (among those reported in the literature ,,,− ), a given oxide to carbon weight ratio of 5:1 would mean a surface area ratio of about 1:2. This easy calculation indicates that the addition of only 20 wt % of carbon into the electrodes would result in double the carbon surface area compared to that of the perovskite catalyst.…”

Section: Introductionmentioning

confidence: 99%

Composite Electrode Boosts the Activity of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ Perovskite and Carbon toward Oxygen Reduction in Alkaline Media

et al. 2014

View full text Add to dashboard Cite

Herein we report the electrochemical activity and selectivity toward the oxygen reduction reaction (ORR) for composite electrodes made of Ba0.5Sr0.5Co0.8Fe0.2O3‑δ (BSCF) perovskite oxide and Acetylene black (AB) carbon in alkaline media. The onset potential and the selectivity, i.e., hydroperoxide formation, toward the ORR exhibit a volcano type behavior as a function of the electrode composition. The HO2 – formation measured by rotating ring disk electrode technique decreases from about 60% and 70% for the BSCF and the AB, respectively, to 28% for the electrode having a BSCF/AB weight ratio of 1.25 (values taken at 0.4 V vs RHE). Accordingly, the value for the overall transferred electrons is significantly larger (around 3.5) for the composite electrode compared to individual materials. Therefore, the overall results point toward a beneficial interaction between BSCF and AB. Different scenarios are considered; first an improved electrical connection of BSCF particle agglomerates upon carbon addition. However, the latter cannot fully explain the significant improvement in ORR activity and selectivity for the composite electrodes. By measuring the BSCF electrochemical activity toward HO2 – reduction, we can exclude the occurrence of a synergistic ORR process where oxygen is first reduced on AB to OH2 –, and then further electroreduced to OH– by the BSCF. Besides the activity toward hydroperoxide electroreduction, the potential of BSCF as catalyst for the hydroperoxide disproportionation reaction is also investigated, and even though a certain catalytic activity exists, the perovskite oxide shows rather low decomposition rate. These results might suggest that ligand (electronic) effects between the two materials also play a role in the enhanced ORR activity of the composite electrodes.

show abstract

“…It has been reported that the half metallic properties of SFM was quite sensitive to the anti-site defect concentration as it altered the Fe-O-Mo bonding network and the electronic hopping pathway [18] . Due to a decrease in the crystal symmetry and the cation order, the double exchange interaction between Fe-O-Mo may be inhibited at x≥0.4, leading to decreased conductivities [19][20][21] . In order to study the effect of different La 3+ contents on the activities of LxSFNM oxides toward oxygen evolution and CO2 reduction reactions, electrochemical impedance measurements were performed on electrolyte-supported symmetrical cells with impregnated LxSFNM electrodes, i.e., LxSFNM@LSGM|LSGM| LxSFNM@LSGM (Fig.…”

Section: Resultsmentioning

confidence: 99%

Symmetrical La³⁺-doped Sr₂Fe_1.5Ni_0.1Mo_0.4O_6-_δ Electrode Solid Oxide Fuel Cells for Pure CO₂ Electrolysis

Wang¹,

Cui²,

Wang³

et al. 2021

Journal of Inorganic Materials

View full text Add to dashboard Cite

Electrochemical reduction of the greenhouse gas CO2 in solid oxide electrolysis cells (SOECs) has attracted much attention due to their high energy conversion efficiency and great potential for carbon cycling. Compared with the asymmetrical configuration, symmetrical SOECs with the same material as both th e anode and the cathode, can greatly simplify the fabrication process and reduce the complication associated with varied interfaces. Perovskite oxides La xSr2-xFe1.5Ni0.1Mo0.4O6-δ (LxSFNM, x=0.1, 0.2, 0.3 and 0.4) are prepared and evaluated as symmetrical electrodes in solid oxide electrolysis cells for electrochemical reduction of pure CO2. The polarization resistances are 0.07 Ω•cm 2 in air and 0.62 Ω•cm 2 in 50% CO-50% CO2 for L0.3SFNM electrode at 800 ℃. An electrolysis current density of 1.17 A•cm -2 under 800 ℃ at 1.5 V is achieved for the symmetrical SOECs in pure CO2. Furthermore, the symmetrical cell demonstrates excellent stability during the preliminary 50-hour CO2 electrolysis measurements.

show abstract

Effect of La doping on the electrochemical activity of double perovskite oxide Sr2FeMoO6 in alkaline medium

Cited by 22 publications

References 30 publications

Stabilizing Double Perovskite for Effective Bifunctional Oxygen Electrocatalysis in Alkaline Conditions

Stabilizing Double Perovskite for Effective Bifunctional Oxygen Electrocatalysis in Alkaline Conditions

Composite Electrode Boosts the Activity of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ Perovskite and Carbon toward Oxygen Reduction in Alkaline Media

Symmetrical La³⁺-doped Sr₂Fe_1.5Ni_0.1Mo_0.4O_6-_δ Electrode Solid Oxide Fuel Cells for Pure CO₂ Electrolysis

Contact Info

Product

Resources

About

Effect of La doping on the electrochemical activity of double perovskite oxide Sr2FeMoO6 in alkaline medium

Cited by 22 publications

References 30 publications

Stabilizing Double Perovskite for Effective Bifunctional Oxygen Electrocatalysis in Alkaline Conditions

Stabilizing Double Perovskite for Effective Bifunctional Oxygen Electrocatalysis in Alkaline Conditions

Composite Electrode Boosts the Activity of Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite and Carbon toward Oxygen Reduction in Alkaline Media

Symmetrical La3+-doped Sr2Fe1.5Ni0.1Mo0.4O6-δ Electrode Solid Oxide Fuel Cells for Pure CO2 Electrolysis

Contact Info

Product

Resources

About

Composite Electrode Boosts the Activity of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ Perovskite and Carbon toward Oxygen Reduction in Alkaline Media

Symmetrical La³⁺-doped Sr₂Fe_1.5Ni_0.1Mo_0.4O_6-_δ Electrode Solid Oxide Fuel Cells for Pure CO₂ Electrolysis