A kinetic study of oxygen reduction reaction on La2NiO4 cathodes by means of impedance spectroscopy

Escudero, M.J.; Aguadero, Ainara; Alonso, J. A.; Daza, L.

doi:10.1016/j.jelechem.2007.08.006

Cited by 336 publications

(184 citation statements)

References 14 publications

(16 reference statements)

Supporting

Mentioning

161

Contrasting

Order By: Relevance

“…54,55 The dissociated oxygen atoms are stabilised compared to the transition state energy by 0.25 eV, which is the main difference from the dissociation mechanism on the SrTiO3 surface where such stabilisation was not observed. The lowest energy is estimated for the chemisorbed oxygen molecule on the LaO surface and while 14 the LaO terminated La2NiO4 surface can dissociate oxygen, the lower activation barrier for the reverse reaction shows that the surface would tend to favour oxygen evolution.…”

mentioning

confidence: 88%

The interaction of molecular oxygen on LaO terminated surfaces of La₂NiO₄

et al. 2016

View full text Add to dashboard Cite

Rare-earth metal oxides with perovskite-type crystal structures are under consideration for use as air electrode materials for intermediate to high temperature electrochemical device applications.The surface chemistry of these materials plays a critical role in determining the kinetics of oxygen reduction and exchange reactions. Among various perovskite-structured oxides, certain members of the Ruddlesden-Popper series, e.g. La2NiO4, have been identified as significantly active for surface oxygen interaction. However, the challenge remains to be the identification of the structure and composition of active surfaces, as well as the influence of these factors on the mechanisms of surface exchange reactions. In this contribution, the changes in electronic structure and the energetics of oxygen interaction on surfaces of La2NiO4 are analysed using first principle calculations in the Density Functional Theory (DFT) formalism. As for the surface chemistry, the LaO termination rather than the NiO2 is presumed due to recent experimental evidence for the surfaces of various perovskite structured oxides after heat treatment in oxidizing environments being transition metal free. Our findings substantiate that the LaO terminated surface can indeed participate in the formation of the surface superoxo species. Detailed charge transfer analyses revealed that it is possible for such a surface to be catalytically active owing to the enhanced electronic configurations on neighbouring La sites to surface species. In addition, positively charged oxygen vacancies, relative to the crystal lattice, can act as active sites and catalyse the O-O bond cleavage.

show abstract

mentioning

confidence: 88%

The interaction of molecular oxygen on LaO terminated surfaces of La₂NiO₄

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The insensitivity of R H to P O2 (m = 0.01-0.08) suggests that the high-frequency process is likely associated with O 2− transfer across the electrode/electrolyte interface, which is a P O2 -independent process. 43,44 On the other hand, the strong sensitivity of R L to P O2 and closeness of m = 0.40-0.62 to 0.50 implies that the dissociation of O 2 into 2O ads is responsible for the low-frequency semicircle. 43,45 A further Arrhenius plot of R H and R L in Fig.…”

Section: Conductivity Vs Time-mentioning

confidence: 99%

“…43,44 On the other hand, the strong sensitivity of R L to P O2 and closeness of m = 0.40-0.62 to 0.50 implies that the dissociation of O 2 into 2O ads is responsible for the low-frequency semicircle. 43,45 A further Arrhenius plot of R H and R L in Fig. 8 reveals a lower E a for R H than R L , i.e.…”

Section: Conductivity Vs Time-mentioning

confidence: 99%

A Broad Stability Investigation of Nb-Doped SrCoO_2.5+δas a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells

Wang

Jiang

Xiong

et al. 2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

The present work reports a systematic study on the structural, thermal, electrical and electrochemical stability of SrCo1−xNbxO2.5+δ series as a potential reversible oxygen-electrode for intermediate-temperature solid oxide fuel cells. The identified best composition is x = 0.10, which exhibits a stable pseudo primitive cubic structure at <700°C and a reversible oxygen redox reaction at 350°C. The conductivity of this material is p-type and also exhibits a peak at 350°C, implying that the electron hole conduction is closely associated with the oxygen nonstoichiometry. Electrochemical impedance spectroscopy analysis indicates a low polarization resistance rate-limited by a slower surface O2 dissociation step. Overall, the material is thermally stable and oxygen redox reversible below 700°C, above which a catalytically less active brownmillerite SrCoO2.5 is formed.

show abstract

“…The lower value of the capacitance C HF (~10 -4 F.cm -2 ) indicates that this process is related to oxygen ion transfer and electronic processes, and the larger value of the capacitance C LF (~10 -2 F.cm -2 ) can be related to molecular oxygen dissociation and diffusion process [27].…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

et al. 2017

View full text Add to dashboard Cite

Abstract:The perovskite La 0.15 Sm 0.35 Sr 0.08 Ba 0.42 FeO 3-δ has been prepared by the glycine nitrate (GNC) route, varying the fuel/oxidizer ratio (glycine/nitrate, G/N= 1 and 2) and cooling rate (slow cooling and air-quenched), in order to study the influence of sample preparation on the materials' properties, in the context of their application as a cathode material for SOFCs. For this, the performance of the prepared mixed ion and electron conducting perovskite oxides is dictated by their structure, oxygen stoichiometry (3-δ), chemical composition and thermal expansion properties. High-resolution Synchrotron X-ray powder diffraction patterns were collected at room temperature and at 700 and 800ºC. It was found that the materials had a cubic crystal structure at these temperatures. As expected, 3-δ decreased as temperature increased, and was slightly smaller for the quenched sample. Higher electrical conductivity values were obtained for the sample with G/N = 1 (air-quenched) in the cooling rate. At 700 and 800°C the cathode synthesized with G/N = 1 and air-quenched showed the smallest polarization resistance values in impedance spectroscopy studies. Therefore, the physicochemical and electrochemical characterization clearly demonstrated the influence of the synthetic conditions on the cathode performance.

show abstract

A kinetic study of oxygen reduction reaction on La2NiO4 cathodes by means of impedance spectroscopy

Cited by 336 publications

References 14 publications

The interaction of molecular oxygen on LaO terminated surfaces of La₂NiO₄

The interaction of molecular oxygen on LaO terminated surfaces of La₂NiO₄

A Broad Stability Investigation of Nb-Doped SrCoO_2.5+δas a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells

Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

Contact Info

Product

Resources

About

A kinetic study of oxygen reduction reaction on La2NiO4 cathodes by means of impedance spectroscopy

Cited by 336 publications

References 14 publications

The interaction of molecular oxygen on LaO terminated surfaces of La2NiO4

The interaction of molecular oxygen on LaO terminated surfaces of La2NiO4

A Broad Stability Investigation of Nb-Doped SrCoO2.5+δas a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells

Effect of the synthesis conditions on the properties of La0.15Sm0.35Sr0.08Ba0.42FeO3−δ cathode material for SOFCs

Contact Info

Product

Resources

About

The interaction of molecular oxygen on LaO terminated surfaces of La₂NiO₄

The interaction of molecular oxygen on LaO terminated surfaces of La₂NiO₄

A Broad Stability Investigation of Nb-Doped SrCoO_2.5+δas a Reversible Oxygen Electrode for Intermediate-Temperature Solid Oxide Fuel Cells