Electrical and electrochemical properties of the Sr(Fe,Co,Mo)O3−δ system as air electrode for reversible solid oxide cells

Zapata-Ramírez, Víctor; Mather, Glenn C.; Azcondo, M. Teresa; Amador, Ulises; Pérez-Coll, Domingo

doi:10.1016/j.jpowsour.2019.226895

Cited by 30 publications

(25 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The oxygen-ordered SrFeO 3−δ composition 6,34 is stabilized as a cubic perovskite (space group, Pm3m) at the resolution of the diffracting medium on partial substitution of Fe for Mo, as previously reported. 4,35 An XRD powder pattern of the SFM:CGO composite air electrode fired at 800 °C for 12 h is shown in Figure 1b. The only reflections present are those corresponding to SFM and CGO, indicating that the air−electrode components do not react to any significant extent at the sintering temperature.…”

Section: Resultsmentioning

confidence: 99%

“…28 The sites for the electrochemical reaction are thus highly active at lower temperatures because the free surface of the CPO interlayer becomes suitable for oxygen reduction (Figure 8c). For the assembly with the CPO interlayer, the low ionic conductivity of the SFM porous component as temperature decreases 4 is compensated by the high mixed-conducting character of CPO, which promotes the extension of the surface path to the active interlayer, thus markedly improving the electrochemical performance (Figure 7a). Moreover, the effective area for ionic transport is considerably improved, which is reflected in a significant enhancement of the geometrically normalized series conductance (Figures 7b and 8c).…”

Section: Resultsmentioning

confidence: 99%

“…The performance of typical air electrodes is sluggish at this temperature due to poor oxygen exchange at the surface and lower oxide-ion diffusion, both partly attributable to the lower oxygen-vacancy concentration. 4 The good thermal compatibility between the SFM and ceriabased components at lower temperature is a further benefit of the incorporation of the CPO and CGO interlayers.…”

Section: Resultsmentioning

confidence: 99%

“…We recently studied the effects of Mo doping in SrFeO 3−δ perovskite, finding that the electrochemical performance under both cathodic and anodic polarization of SrFe 0.9 Mo 0.1 O 3−δ is promising for use as an air electrode in reversible solid oxide cells and very competitive with the cobalt-containing material, SrFe 0.45 Co 0.45 Mo 0.1 O 3−δ , but with more compatible thermal expansion with other cell components. 4 Similar ferrite-based perovskites are also of interest in symmetrical SOFCs, where switching polarity provides a solution to coke formation and sulfur poisoning of the anode on operation with hydrocarbons, since the pollutant species may be reoxidized. 5,6 Many promising perovskite air electrodes exhibit high activation energies for the oxygen oxidation−reduction reaction, 7,8 resulting in considerable electrode polarization resistance as temperature decreases.…”

Section: Introductionmentioning

confidence: 99%

“…The air electrode performance is especially relevant in the intermediate-temperature range, where the kinetics of the oxygen electrochemical reactions are slower. We recently studied the effects of Mo doping in SrFeO 3−δ perovskite, finding that the electrochemical performance under both cathodic and anodic polarization of SrFe 0.9 Mo 0.1 O 3−δ is promising for use as an air electrode in reversible solid oxide cells and very competitive with the cobalt-containing material, SrFe 0.45 Co 0.45 Mo 0.1 O 3−δ , but with more compatible thermal expansion with other cell components . Similar ferrite-based perovskites are also of interest in symmetrical SOFCs, where switching polarity provides a solution to coke formation and sulfur poisoning of the anode on operation with hydrocarbons, since the pollutant species may be reoxidized. , …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Enhanced Intermediate-Temperature Electrochemical Performance of Air Electrodes for Solid Oxide Cells with Spray-Pyrolyzed Active Layers

Zapata-Ramírez

Santos‐Gómez

Mather

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

The potential of interactive layers of mixed-conducting oxides for improving the performance of air electrodes of solid oxide cells in the intermediate-temperature range is demonstrated. Active layers of Ce0.9Gd0.1O2−δ (CGO), Ce0.8Pr0.2O2−δ (CPO), and SrFe0.9Mo0.1O3−δ (SFM) with thickness in the range 200–400 nm are deposited on CGO-based electrolyte by spray pyrolysis, followed by deposition of a SFM/CGO composite air electrode by painting. The morphologies and phase composition of the active layers are examined by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy microanalysis. The electrochemical performance of the electrolyte–electrode assemblies is determined by impedance spectroscopy in the range 600–800 °C. Significant improvements in the performance of the electrode process and the geometrically normalized ohmic conductance are observed for the assembly with a CPO active layer with mixed-oxide-ionic–electronic conductivity, especially in the low-temperature range, attributable to extension of the surface path of the electrochemical reactions. The CGO intermediate layer also improves performance but to a lesser degree, most likely due to better ionic-current collection in comparison to the assemblies with either SFM as the active layer or no active layer.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhanced Intermediate-Temperature Electrochemical Performance of Air Electrodes for Solid Oxide Cells with Spray-Pyrolyzed Active Layers

Zapata-Ramírez

Santos‐Gómez

Mather

et al. 2020

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

Boosting the Performance of La_0.8Sr_0.2MnO_3‐δ Electrodes by The Incorporation of Nanocomposite Active Layers

Zamudio‐García

Caizán‐Juanarena

Porras

et al. 2022

Adv Materials Inter

View full text Add to dashboard Cite

emissions for the environment. Technologies such as fuel cells efficiently convert the chemical energy into electricity, thus becoming suitable candidates to achieve such transition. [1,2] In particular, solid oxide fuel cells (SOFCs) are of great interest for energy conversion due to their robustness, entirely solid structure and flexibility to use a wide variety of fuels, such as hydrogen, natural gas, and other gasified renewable biofuels. [3,4] In addition, they can also operate in reverse mode as solid oxide electrolysis cells (SOECs) to convert electricity back into chemical energy when needed. [5] Nowadays, the main applications of SOFCs are related to medium and large stationary power generation plants, while their presence in portable devices and transportation is still limited. [6,7] One of the main reasons for that is their high operating temperatures (>800 °C) which, despite allowing high fuel conversion efficiencies, lead to accelerated material degradation and thereby shortening the cell lifetime. For that reason, an increasing research interest has grown around intermediate temperature SOFCs (IT-SOFCs), operating between 600 and 800 °C. [8] In this temperature range, the cell performance is mainly limited by the air electrode due its low kinetics toward the oxygen reduction reaction (ORR). [9] This is the case for the conventional air electrode material La 0.8 Sr 0.2 MnO 3-δ (LSM), which exhibits poor electrocatalytic activity for ORR below 800 °C. [10] Since the ionic conductivity of LSM is extremely low (4 × 10 -8 S cm -1 at 900 °C), [11] the electrochemical reaction sites for ORR are limited to the triple phase boundary (TPB) region close to the electrode/electrolyte interface.In this context, mixed ionic-electronic conductors (MIECs) with better electrochemical properties have been developed as air electrodes in the last few years, e.g. La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3-δ (LSCF), Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF), or PrBaCo 2 O 5+δ . [12] However, they suffer from several drawbacks, such as high thermal expansion coefficients, phase instability or phase segregation on the electrode surface. [13] For this reason, LSM is still considered an appropriate cathode for SOFC construction, despite its poorer performance at intermediate temperatures.Numerous strategies have been proposed to improve the performance of LSM by increasing the TPB region for ORR: i) the use of composite electrodes by combining LSM with different oxide ion conductors, such as Zr 0.84 Y 0.16 O 1.92 (YSZ) andThe use of active layers is a promising strategy to improve the properties of air electrodes for solid oxide fuel cells (SOFCs). In this work, La 0.8 Sr 0.2 MnO 3-δ is combined with different oxide ion conductors Ce 0.9 Gd 0.1 O 1.95 , Bi 1.5 Y 0.5 O 3 and Pr 6 O 11 to form highly efficient nanocomposite active layers in a single step by spray-pyrolysis deposition. One of the main advantages of these nanocomposite layers is that the nanoscale microstructure is retained at relatively high sintering temperatures. As a con...

show abstract

Boosted electrochemical performance of ca‐cobaltite‐based composite electrodes for reversible solid oxide cells

Araújo

Loureiro

Holz

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary In this article, the electrode performance of the misfit‐layered calcium cobaltite (C349), as cathode for solid oxide fuel and anode for solid oxide electrolysis cell (SOEC), is analysed by electrochemical impedance spectroscopy using a 3‐probe cell configuration. The addition of Ce0.8Gd0.2O2−δ (CGO20) as a composite electrode phase significantly boosts the electrochemical processes, decreasing the polarisation resistance (Rp) by approximately half an order of magnitude over the studied temperature range (550°C‐700°C). Electrical measurements under cathodic and anodic polarisation indicate that the C349/CGO20 composite is a promising oxygen electrode for reversible solid oxide cells with enhanced performance when operated as a SOEC anode. Short‐term stability testing of 50 h, under anodic polarisation at 700°C, demonstrates a stable current density with no observable microstructure delamination after measurements, being promising to avoid common degradation issues during SOEC operation.

show abstract

Electrical and electrochemical properties of the Sr(Fe,Co,Mo)O3−δ system as air electrode for reversible solid oxide cells

Cited by 30 publications

References 39 publications

Enhanced Intermediate-Temperature Electrochemical Performance of Air Electrodes for Solid Oxide Cells with Spray-Pyrolyzed Active Layers

Enhanced Intermediate-Temperature Electrochemical Performance of Air Electrodes for Solid Oxide Cells with Spray-Pyrolyzed Active Layers

Boosting the Performance of La_0.8Sr_0.2MnO_3‐δ Electrodes by The Incorporation of Nanocomposite Active Layers

Boosted electrochemical performance of ca‐cobaltite‐based composite electrodes for reversible solid oxide cells

Contact Info

Product

Resources

About

Electrical and electrochemical properties of the Sr(Fe,Co,Mo)O3−δ system as air electrode for reversible solid oxide cells

Cited by 30 publications

References 39 publications

Enhanced Intermediate-Temperature Electrochemical Performance of Air Electrodes for Solid Oxide Cells with Spray-Pyrolyzed Active Layers

Enhanced Intermediate-Temperature Electrochemical Performance of Air Electrodes for Solid Oxide Cells with Spray-Pyrolyzed Active Layers

Boosting the Performance of La0.8Sr0.2MnO3‐δ Electrodes by The Incorporation of Nanocomposite Active Layers

Boosted electrochemical performance of ca‐cobaltite‐based composite electrodes for reversible solid oxide cells

Contact Info

Product

Resources

About

Boosting the Performance of La_0.8Sr_0.2MnO_3‐δ Electrodes by The Incorporation of Nanocomposite Active Layers