AC Impedance Analysis of Bifunctional Air Electrodes for Metal-Air Batteries

Arai, Hajime; Müller, Stefan; Haas, O.

doi:10.1149/1.1393943

Cited by 112 publications

(69 citation statements)

References 44 publications

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“…According to Koutecky-Levich theory [10]: [1] where i dl is the diffusion-limiting current, n is the overall electron transfer number in ORR, F is the Faraday constant (96500 C mol -1 ), A is the geometric area of the disk electrode (0.16 cm 2 ), From Figures 8-10, the Koutecky-Levich (K-L) plots can be plotted for the La x Ca 0.4 MnO 3 /C electrodes in two KOH concentrations, as shown in Figure 11. These theoretical plots were calculated based on the parameters reported in the literature [11] [12] and are listed in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Electrocatalytic Activity of Non-Stoichiometric Perovskites toward Oxygen Reduction Reaction in Alkaline Electrolytes

Yuan¹,

Li²,

Ivey³

et al. 2011

ECS Trans.

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Perovskite La x Ca 0.4 MnO 3 (x = 0.4, 0.5, 0.6) powder was prepared through a sol-gel method and characterized by X-ray diffraction (XRD), a gas adsorption technique (BET) and transmission electron microscopy (TEM). The electrocatalytic properties of La x Ca 0.4 MnO 3 /C composites towards the oxygen reduction reaction (ORR) were studied using rotating ring-disk electrode (RRDE) techniques and Koutecky-Levich theory in both 1 M and 6 M KOH electrolytes. The results show better ORR activities for non-stoichiometric perovskites than that for stoichiometric La 0.6 Ca 0.4 MnO 3 . The overall electron transfer numbers for these La x Ca 0.4 MnO 3 composites are in the range of 3.2-3.7, and with decreasing values of x the electron transfer number increases and accordingly H 2 O 2 production decreases. These results suggest that the existence of a Mn reduction/oxidation pair in Ca-doped nonstoichiometric perovskites could activate the ORR reaction sites, resulting in improved catalytic activity.

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Section: Resultsmentioning

confidence: 99%

Electrocatalytic Activity of Non-Stoichiometric Perovskites toward Oxygen Reduction Reaction in Alkaline Electrolytes

Yuan¹,

Li²,

Ivey³

et al. 2011

ECS Trans.

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“…It has been recognized that ZARBs could be used in several important power-intensive areas, such as portable and back-up power, and automobile applications. However, several major challenges still exist at the current stage of technology, including relatively low performance and insufficient stability in the bi-functional air-cathode [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Magneli phase Ti4O7 electrode for oxygen reduction reaction and its implication for zinc-air rechargeable batteries

Li¹,

Zhu²,

Qu³

et al. 2010

Electrochimica Acta

164

133

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In this paper, Magneli phase Ti 4 O 7 was successfully synthesized using a TiO 2 reduction method, and characterized using X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The electrode coated with this Ti 4 O 7 material showed activities for both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). For the ORR, several parameters, including overall electron transfer number, kinetic constants, electron transfer coefficient, and percentage H 2 O 2 production, were obtained using the rotating ring-disk electrode (RRDE) technique and the Koutecky-Levich theory. The overall electron transfer number was found to be between 2.3 and 2.9 in 1, 4, and 6 M KOH electrolytes, suggesting that the ORR process on the Ti 4 O 7 electrode was a mixed process of 2-and 4-electron transfer pathways. Electrochemical durability tests, carried out in highly concentrated KOH electrolyte, confirmed that this Ti 4 O 7 is a stable electrode material, suggesting that it should be a feasible candidate for the aircathodes of zinc-air batteries. To understand the stability of this material, Raman and XPS spectra were also collected for the Ti 4 O 7 samples before and after the stability tests. The results and analysis revealed that a thin layer of TiO 2 formed on the Ti 4 O 7 surface, which may have prevented further oxidation into the bulk of the Ti 4 O 7 electrode.Crown

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“…In literature (1,(4)(5)(6), Lanthanum-based perovskite-type oxides (LnBO 3 , Ln= La, or partially substituted by Ca or Sr; B= Co, Mn, or Fe) have been extensively studied as the air-electrodes due to their high catalytic activities towards the ORR, high oxide ion mobility, mixed ionic and electronic conductivity, as well as environmental benign features. These kinds of materials also possess catalytic activities towards oxygen evolution reaction (OER), making them a candidate for bi-functional electrode in metalair rechargeable batteries.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Activities of Perovskite toward Oxygen Reduction Reaction in Concentrated Alkaline Electrolytes

Li¹,

Zhang²,

Wang³

2010

ECS Trans.

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Perovskite La 0.6 Ca 0.4 CoO 3 powder was prepared through a sol-gel method and characterized by XRD and BET. The electrocatalytic properties of La 0.6 Ca 0.4 CoO 3 (LCCO) and La 0.6 Ca 0.4 CoO 3 -Carbon composite (LCCO-C) based electrode layers towards oxygen reduction reaction (ORR) were studied using rotating ring-disk electrode technique (RRDE) in 1, 4, and 6 M KOH electrolytes. Koutechy-Levich theory and RRDE measurement were applied to acquire the overall electron transfer number and kinetic parameters, such as the kinetic currents and rate constants. The overall electron transfer number was measured to be almost 4 for both pure LCCO and composite LCCO-C. A synergetic effect toward the ORR was observed in the LCCO electrode layer in the presence of carbon. This synergetic effect might be one of the reasons for the improved ORR performance on the composite LCCO-C electrode.

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AC Impedance Analysis of Bifunctional Air Electrodes for Metal-Air Batteries

Cited by 112 publications

References 44 publications

Electrocatalytic Activity of Non-Stoichiometric Perovskites toward Oxygen Reduction Reaction in Alkaline Electrolytes

Electrocatalytic Activity of Non-Stoichiometric Perovskites toward Oxygen Reduction Reaction in Alkaline Electrolytes

Magneli phase Ti4O7 electrode for oxygen reduction reaction and its implication for zinc-air rechargeable batteries

Electrocatalytic Activities of Perovskite toward Oxygen Reduction Reaction in Concentrated Alkaline Electrolytes

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