Thermodynamic data of Ba0.6Sr0.4Co0.8Fe0.2O3−δ SOFC cathode material

Botea‐Petcu, Alina; Tănăsescu, Speranţa; Varazashvili, V. S.; Lejava, N.; Machaladze, Tengiz; Khundadze, M.; Maxim, Florentina; Teodorescu, Florina; Martynczuk, Julia; Yáng, Zhèn; Gauckler, Ludwig J.

doi:10.1016/j.materresbull.2014.06.002

Cited by 10 publications

(4 citation statements)

References 35 publications

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“…The presence of Sr 3+ , Co 3+ , and Fe 3+ produces oxygen vacancies to sustain the electrostatic stability when there is a change from Ce 4+ to Ce 3+ , Co 3+ to Co 2+ , Sr 3+ to Sr 2+ , and Fe 3+ to Fe 2+ (Eq. 16–19) [64, 65], where ∼ represents an empty position (anion‐vacant site) originating from the removal of O 2− from the lattice.

…”

Section: Resultsmentioning

confidence: 99%

Ce_0.8Sr_0.2Co_xFe_1‐xO_3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

et al. 2020

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Three perovskite-type nanocomposites, i. e. Ce 0.8 Sr 0.2 Co x Fe 1-x O 3-δ (x = 0.2, CSCF1; 0.5, CSCF2; 0.8, CSCF3), were synthesized employing the sol-gel technique, subsequent to which they were physically and electrochemically evaluated for their electrocatalytic activity towards the oxygen evolution reaction (OER) in alkaline medium (0.1 M KOH) at room temperature (25°C). Electrochemical characterisation revealed Ce 0.8 Sr 0.2 Co 0.8 Fe 0.2 O 3-δ (CSCF3) to be the most active having the lowest overpotential at 10 mA cm À 2 (440 mV), the lowest Tafel slope (40.7 mV dec À 1), the highest mass activity (20.11 mA mg À 1) and highest specific activity (2.22 mA cm À 2).

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…”

Section: Resultsmentioning

confidence: 99%

Ce_0.8Sr_0.2Co_xFe_1‐xO_3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

et al. 2020

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“…Furthermore, the samples calcined at 800 exhibited a weight increase from 250 °C -550 °C followed by a gradual weight loss from 550 °C -700 °C and a minimal weight increase throughout the process. The weight changes of the samples were assumed to be mainly due to the movement of lattice oxygen and vacancies within the samples [7,[37][38][39], which can be represented, using Kröger-Vink notation [7,37], by the following equations:…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Novel Nanophase Ce0.8Sr0.2Fe0.9Ir0.1O3-δ as Cathode Material for Low Temperature SOFC

Njoku

Ndungu

2016

JNanoR

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In this study, Ce0.8Sr0.2Fe0.9Ir0.1O3-δ (CSFI) perovskite type material was prepared by sol-gel technique, characterised, and then tested as a cathode material for solid oxide fuel cells operating between 300 – 500 °C. The materials were studied using X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The morphology was examined using scanning electron microscopy and high resolution transmission electron microscopy. Samples showed changes in the overall structure and defect chemistry with an increase in calcination temperature. When tested as cathode materials, the material calcined at 1000 °C had the greatest performance at a test temperature of 500 °C, with a current density of 774.47 mA/cm2, a power density of 483.07 mW/cm2 and an area specific resistance (ASR) of 0.342 Ω/cm2.

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“…According to a report by Ruetschi et al [19] on transition metals, it was reported that the catalytic activity followed this activity trend, Co ≈ or > Fe > Ni, indicating more favorable kinetics and better OER catalytic activity [21,59]. The trend in the Tafel slope values implies that the rate-determining step involves a chemical step subsequent to the first electron transfer [60]. From the comparison of the samples, it was observed that the different Tafel slopes implicate different ratedetermining steps (RDS), and the changes in Tafel slopes might be as a result of the change under higher overpotential conditions [64,65].…”

Section: Tafel Slopementioning

confidence: 89%

“…Furthermore, the presence of Ce 3+ in the cerianite structure produces oxygen vacancies to sustain electrostatic stability according to Eq. 12 [59,60], where ⊡ represents an empty position (anion-vacant site) originating from the removal of O 2− from the lattice:…”

Section: Xrd Analysismentioning

confidence: 99%

Sol-gel Synthesis of Ce0.8Sr0.2Co1-(x+y)NixFeyO3-δ (x = 0.1, 0.2, and y = 0.2, 0.5, 0.7)—a Nanocomposite-Type Electrocatalyst for the Oxygen Evolution Reaction in Alkaline Media

Njoku

Kriek

2020

Electrocatalysis

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We report on nanocomposite materials that are both active and stable for the oxygen evolution reaction (OER) in alkaline media. Ce 0.8 Sr 0.2 Co 0.6 Ni 0.2 Fe 0.2 O 3-δ (CSCNF1), Ce 0.8 Sr 0.2 Co 0.3 Ni 0.2 Fe 0.5 O 3-δ (CSCNF2), and Ce 0.8 Sr 0.2 Co 0.2 Ni 0.1 Fe 0.7 O 3-δ ( CSCNF3) that contain a lanthanide, in the form of Cerium (Ce) in the A site and varied compositions of Co, Ni, and Fe in the B site, were synthesized by a typical sol-gel route and compared with a benchmark nanocomposite, i.e. Ba 0.5 Sr 0.5 Co 0.8 F 0.2 O 3-δ , synthesized by the same method. The crystal structure was examined employing X-ray diffraction (XRD) and the textural properties were examined using Fourier transform infrared spectroscopy (FTIR). The morphology and microstructure were examined employing scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The CSCNF1 (n = 1, 2, or 3) nanocomposite materials exhibited high intrinsic activities, by displaying overpotentials of 0.290 V, 0.470 V, and 0.350 V for CSCNF1, CSCNF2, and CSCNF3, respectively, at 10 mA cm −2 , and Tafel slopes of 54.1 mV dec −1 , 71.3 mV dec −1 , and 62.8 mV dec −1 , respectively. CSCNFn (n = 1-3) nanocomposites compared with BSCF nanocomposite established its viability as a good electrocatalyst. They exhibited good electrocatalytic performance and stability and deserve further investigation as electrocatalysts for the OER in alkaline solution.

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Thermodynamic data of Ba0.6Sr0.4Co0.8Fe0.2O3−δ SOFC cathode material

Cited by 10 publications

References 35 publications

Ce_0.8Sr_0.2Co_xFe_1‐xO_3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Ce_0.8Sr_0.2Co_xFe_1‐xO_3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Evaluation of Novel Nanophase Ce<sub>0.8</sub>Sr<sub>0.2</sub>Fe<sub>0.9</sub>Ir<sub>0.1</sub>O<sub>3-δ</sub> as Cathode Material for Low Temperature SOFC

Sol-gel Synthesis of Ce0.8Sr0.2Co1-(x+y)NixFeyO3-δ (x = 0.1, 0.2, and y = 0.2, 0.5, 0.7)—a Nanocomposite-Type Electrocatalyst for the Oxygen Evolution Reaction in Alkaline Media

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Thermodynamic data of Ba0.6Sr0.4Co0.8Fe0.2O3−δ SOFC cathode material

Cited by 10 publications

References 35 publications

Ce0.8Sr0.2CoxFe1‐xO3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Ce0.8Sr0.2CoxFe1‐xO3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Evaluation of Novel Nanophase Ce<sub>0.8</sub>Sr<sub>0.2</sub>Fe<sub>0.9</sub>Ir<sub>0.1</sub>O<sub>3-δ</sub> as Cathode Material for Low Temperature SOFC

Sol-gel Synthesis of Ce0.8Sr0.2Co1-(x+y)NixFeyO3-δ (x = 0.1, 0.2, and y = 0.2, 0.5, 0.7)—a Nanocomposite-Type Electrocatalyst for the Oxygen Evolution Reaction in Alkaline Media

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Ce_0.8Sr_0.2Co_xFe_1‐xO_3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

Ce_0.8Sr_0.2Co_xFe_1‐xO_3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media