Polypyrrole and La1−xSrxMnO3 (0≤x≤0.4) composite electrodes for electroreduction of oxygen in alkaline medium

Singh, R.N.; Malviya, Manisha; Anindita,; Sinha, Asha; Chartier, P.

doi:10.1016/j.electacta.2006.12.004

Cited by 32 publications

(12 citation statements)

References 40 publications

(56 reference statements)

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“…This shows that at low frequencies there is the establishment of a transition between semi-infinite Warburg (n 2 = 0.5) and finite Warburg (n 3 = 1). Similar semi-infinite-finite Warburg transition regimes are frequently found in the literature for ion intercalation in a polymer matrix [26][27][28]. Thus, the sub circuits (R 2 Q 2 ) and (R 3 Q 3 ) represent a diffusion controlled process; that is, the migration of H + /OH -into the oxide matrix and charging of the double layer particles at potentials prior to the oxygen evolution region.…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 94%

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Electrochemical impedance spectroscopy investigation of spinel type cobalt oxide thin film electrodes in alkaline medium

et al. 2008

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Spinel type Co 3 O 4 thin films, for the oxygen evolution reaction (OER) in 1 M KOH, have been prepared, on stainless steel supports, using the thermal decomposition method at 400°C. The electrochemical behaviour of the oxide film/1 M KOH interface was investigated by cyclic voltammetry and impedance techniques. The impedance measurements were carried out at different positive potentials, from the open circuit potential to a potential in the OER region and the electrical equivalent circuit, L (R 1 Q 1 ) (R 2 Q 2 ) (R 3 Q 3 ) was used to fit the experimental results. At each potential, a good correlation between experimental and simulated data is found, thereby validating the proposed equivalent circuit model. The roughness factor value determined in the potential region where the charge transfer reaction is negligible is similar to that obtained by cyclic voltammetry, with a value of 70 ± 2.

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Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 94%

“…This may be caused by diffusion of the charge species (H + /OH -) into the oxide film through defects and pores [23,24]. The capacitive behaviour of the electrode/electrolyte interface at low frequencies is common in the case of ion intercalation into an inorganic/polymer matrix [25].…”

Section: Electrochemical Impedance Spectroscopy (Eis)mentioning

confidence: 99%

Electrochemical impedance spectroscopy investigation of spinel type cobalt oxide thin film electrodes in alkaline medium

et al. 2008

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“…However, not much literature can be found that investigates the factors affecting the reactivity of LaMnO 3 as a catalyst in an AFC environment [14]. This is also true from a theoretical point of view, and although the electronic structure of the low temperature orthorhombic phase of LaMnO 3 is well understood (by adopting unrestricted Hartree-Fock [15,16] and hybrid-exchange density functional theory [17,18]), there is a lack of knowledge of surface properties.…”

Section: Introductionmentioning

confidence: 96%

Thermodynamic stability of LaMnO3and its competing oxides: A hybrid density functional study of an alkaline fuel cell catalyst

et al. 2011

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The phase stability of LaMnO 3 with respect to its competing oxides is studied using hybridexchange density functional theory (DFT) as implemented in CRYSTAL09. The underpinning DFT total energy calculations are embedded in a thermodynamic framework that takes optimal advantage of error cancellation within DFT. It has been been found that by using the ab initio thermodynamic techniques described here, the standard Gibbs formation energies can be calculated to a significantly greater accuracy than was previously reported (a mean error of 1.6% with a maximum individual error of -3.0%). This is attributed to both the methodology for isolating the chemical potentials of the reference states, as well as the use of the B3LYP functional to thoroughly investigate the ground state energetics of the competing oxides.

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“…The mix metal perovskite La 0.8 Sr 0.2 MnO 3 is a classical catalytic material used as a catalyst for oxygen reduction in fuel cell due to its high catalytic activity and stability [14][15][16]. It shows better performance among other perovskite oxides through intensive studying on rare earth and 3D transition element [17] plus it is cheaper than noble metal catalyst such as Au and Pt.…”

Section: Introductionmentioning

confidence: 99%

Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries

Lin

Huang

et al. 2011

J Solid State Electrochem

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Nano-sized La 0.8 Sr 0.2 MnO 3 prepared by the polyethylene glycol assisting sol-gel method was applied as oxygen reduction catalyst in nonaqueous Li/O 2 batteries. The as-synthesized La 0.8 Sr 0.2 MnO 3 was characterized by X-ray diffraction (XRD), scanning electron microscopy, and Brunauer-Emmet-Teller measurements. The XRD results indicate that the sample possesses a pure perovskite-type crystal structure, even sintered at a temperature as low as 600°C, whereas for solid-state reaction method it can only be synthesized above 1,200°C. The as-prepared nano-sized La 0.8 Sr 0.2 MnO 3 has a specific surface area of 32 m 2 g −1 , which is much larger than the solid-state one (1 m 2 g −1 ), and smaller particle size of about 100 nm. Electrochemical results show that the nano-sized La 0.8 Sr 0.2 MnO 3 has better catalytic activity for oxygen reduction, higher discharge plateau and specific capacity.

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Polypyrrole and La1−xSrxMnO3 (0≤x≤0.4) composite electrodes for electroreduction of oxygen in alkaline medium

Cited by 32 publications

References 40 publications

Electrochemical impedance spectroscopy investigation of spinel type cobalt oxide thin film electrodes in alkaline medium

Electrochemical impedance spectroscopy investigation of spinel type cobalt oxide thin film electrodes in alkaline medium

Thermodynamic stability of LaMnO3and its competing oxides: A hybrid density functional study of an alkaline fuel cell catalyst

Nano-sized La0.8Sr0.2MnO3 as oxygen reduction catalyst in nonaqueous Li/O2 batteries

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