Dual role of carbon in the catalytic layers of perovskite/carbon composites for the electrocatalytic oxygen reduction reaction

Schott, Tiphaine; Napolskiy, Filipp S.; Dintzer, Thierry; Kéranguéven, Gwénaëlle; Istomin, S.Ya.; Tsirlina, Galina A.; Antipov, Evgeny V.; Savinova, Elena R.

doi:10.1016/j.cattod.2012.04.046

Cited by 189 publications

(221 citation statements)

References 46 publications

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“…This suggested a synergy between LaCoO 3 and carbon. These synergistic effects are consistent with those reported in the literatures [25,28]. The ORR catalytic activity of LaCoO 3 (LCO-SP) samples which was synthesized by using sol-gel process is also observed by applying RDE measurement following the same recipe as described earlier for LaCoO 3 (LCO-ME)-Super P modified GC electrode to compare the different particle effect on the oxygen reduction activity of LaCoO 3 oxide material.…”

Section: Ag Agclsupporting

confidence: 88%

“…The latter pathway may be followed either by a further 2e --reduction of peroxide, or the chemical disproportionation of peroxide [28]. Koutecky-Levich plots are shown in Fig.…”

Section: Ag Agclmentioning

confidence: 99%

“…It has been demonstrated that perovskites alone show low electro catalytic activity, which may be increased by a few orders of magnitude when carbon is added to the catalytic layer. There is a synergistic chemical coupling between perovskite and carbon [28]. In this study, a thin-film RDE technique was used, whereby a very thin layer of LaCoO 3 electro catalyst, synthesized by the micro emulsion method, was tested in order to reveal the influence of carbon super P on the catalytic activity of the LaCoO 3 electro catalyst.…”

Section: Introductionmentioning

confidence: 99%

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Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity

Islam

Jeong

Ghani

et al. 2015

Journal of Electrochemical Science and Technology

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The micro emulsion method has been successfully used for preparing perovskite LaCoO 3 with uniform, fine-shaped nanoparticles showing high activity as electro catalysts in oxygen reduction reactions (ORRs). They are, therefore, promising candidates for the air-cathode in metal-air rechargeable batteries. Since the activity of a catalyst is highly dependent on its specific surface area, nanoparticles of the perovskite catalyst are desirable for catalyzing both oxygen reduction and evolution reactions. Herein, LaCoO 3 powder was also prepared by sol-gel method for comparison, with a broad particle distribution and high agglomeration. The electro catalytic properties of LaCoO 3 and LaCoO 3 -carbon Super P mixture layers toward the ORR were studied comparatively using the rotating disk electrode technique in 0.1 M KOH electrolyte to elucidate the effect of carbon Super P. Koutecky-Levich theory was applied to acquire the overall electron transfer number (n) during the ORR, calculated to be ~3.74 for the LaCoO 3 -Super P mixture, quite close to the theoretical value (4.0), and 2.7 for carbon-free LaCoO 3 . A synergistic effect toward the ORR is observed when carbon is present in the LaCoO 3 layer. Carbon is assumed to be more than an additive, enhancing the electronic conductivity of the oxide catalyst. It is suggested that ORRs, catalyzed by the LaCoO 3 -Super P mixture, are dominated by a 2+2-electron transfer pathway to form the final, hydroxyl ion product.

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Section: Ag Agclsupporting

confidence: 88%

“…The latter pathway may be followed either by a further 2e --reduction of peroxide, or the chemical disproportionation of peroxide [28]. Koutecky-Levich plots are shown in Fig.…”

Section: Ag Agclmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity

Islam

Jeong

Ghani

et al. 2015

Journal of Electrochemical Science and Technology

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“…The degree of porosity is highly dependent on the sintering times and lamination pressures used during manufacture [126]. The high-activity of the perovskite electrodes is in part due to the promotion of the direct four-electron oxygen reduction as well as catalytically decomposing the peroxide formed at the carbon [125,127]. The resistance associated with peroxide diffusion from the carbon to the catalyst can be minimised by taking advantage of a high surface area carbon (1200 m 2 g À1 ) in the active layer [128].…”

Section: The Air (Gas Diffusion) Electrodementioning

confidence: 99%

Developments in electrode materials and electrolytes for aluminium–air batteries

Egan¹,

León²,

Wood³

et al. 2013

Journal of Power Sources

402

191

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h i g h l i g h t s< Discussion of the rationale to choose a suitable alloy for Aleair battery. < Effect of the properties and preparation route to enhance the oxidation of Al. < Effect of the inhibitors on the anode oxidation in the alkaline electrolyte. This review shows the influence of the materials, including: aluminium alloy, oxygen reduction catalyst and electrolyte type, in the battery performance. Two issues are considered: (a) the parasitic corrosion of aluminium at open-circuit potential and under discharge, due to the reduction of water on the anode and (b) the formation of a passive hydroxide layer on aluminium, which inhibits dissolution and shifts its potential to positive values. To overcome these two issues, super-pure (99.999 wt%) aluminium alloyed with traces of Mg, Sn, In and Ga are used to inhibit corrosion or to break down the passive hydroxide layer. Since high-purity aluminium alloys are expensive, an alternative approach is to add inhibitors or additives directly into the electrolyte. The effectiveness of binary and ternary alloys and the addition of different electrolyte additives are evaluated. Novel methods to overcome the self-corrosion problem include using anionic membranes and gel electrolytes or alternative solvents, such as alcohols or ionic liquids, to replace aqueous solutions. The air cathode is also considered and future opportunities and directions for the development of aluminiumeair cells are highlighted.

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“…16,17 With the development of a more systematic approach to studying the ORR and OER activities of these oxides 8 and the adoption of the thin-film rotating disk electrode (RDE) method 18 conventionally used for noble metal catalysts for studying the ORR, a vast number of recent publications have been produced in the study of these materials. 19,20,21 With that, further advances have been made in identifying highly active perovskite OER catalysts.Suntivich et al 22 proposed a volcano type correlation between the OER activity and the occupancy of the e g orbital of surface perovskite …”

mentioning

confidence: 99%

Electrocatalysis of Perovskites: The Influence of Carbon on the Oxygen Evolution Activity

Mohamed

Cheng

Fabbri

et al. 2015

J. Electrochem. Soc.

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Single and double perovskite oxides have been reported to be amongst the most active electrocatalysts for the oxygen evolution reaction (OER) in alkaline electrolyte. Although a detailed study of the bulk electronic structure-activity relationship towards oxygen evolution on these oxides has been reported, the influence of carbon on the behavior of these oxides as OER catalysts is not yet clearly understood. In the present work we study the influence of functionalized acetylene black (AB f ) carbon in the electrode composition on the OER activity for perovskite oxides using the thin-film rotating disk electrode technique. It was found that the addition of AB f significantly enhances the OER activity of the single perovskite oxides, namely Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ , (BSCF) and La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF). The activity of the double perovskite oxide, (Pr 0.5 Ba 0.5 )CoO 3-δ (PBCO), was relatively unaffected by the addition of AB f in the electrode. Ex situ impedance spectroscopy measurements at room temperature showed that BSCF powder displayed a lower resistivity compared to PBCO with LSCF displaying the highest resistivity of the three materials. These results therefore suggest that the AB f present can more than simply improve the conductive pathway in the perovskite/carbon composite electrodes but can also significantly enhance the electrocatalytic activity of selected perovskites towards the OER. The oxygen evolution reaction (OER), the process of generating molecular oxygen through the electrochemical oxidation of water, is a key reaction in energy storage processes involving hydrogen and central to addressing the impending global energy crisis. This reaction, occurring at the anode of the water splitting reaction, is primarily governed by slow kinetics 1 and has therefore been extensively studied to improve the performance of devices such as water electrolyzers. 2,3,4 Significant overpotential losses remain a hurdle which requires the need for rare and expensive noble-metal based electrocatalysts for efficient operation. The development and application of new materials able to compete with expensive state-of-the-art current electrocatalysts for hydrogen generating devices therefore yields a great challenge.Various electrocatalytic materials have been studied in the past towards improving the OER, where the oxides of Ir and Ru have been conventionally identified as the most active, often in mixtures with other transition metal oxides. 5,6,7 From the numerous metal oxides studied, perovskite oxides emerged as promising electrocatalysts for both the OER and ORR (oxygen reduction reaction) in alkaline media where a number of these oxides have been reported to be sufficiently stable for practical applications. 8,9 The perovskite-type oxide family, has the general formula ABO 3 , where the A-site is occupied by an alkaline earth element, such as Ca, Ba and Sr and rare earth elements (lanthanides) such as La or Pr. The B-site is occupied by a transition metal element in 6-fold coordination to...

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Dual role of carbon in the catalytic layers of perovskite/carbon composites for the electrocatalytic oxygen reduction reaction

Cited by 189 publications

References 46 publications

Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity

Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity

Developments in electrode materials and electrolytes for aluminium–air batteries

Electrocatalysis of Perovskites: The Influence of Carbon on the Oxygen Evolution Activity

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Dual role of carbon in the catalytic layers of perovskite/carbon composites for the electrocatalytic oxygen reduction reaction

Cited by 189 publications

References 46 publications

Micro Emulsion Synthesis of LaCoO3Nanoparticles and their Electrochemical Catalytic Activity

Micro Emulsion Synthesis of LaCoO3Nanoparticles and their Electrochemical Catalytic Activity

Developments in electrode materials and electrolytes for aluminium–air batteries

Electrocatalysis of Perovskites: The Influence of Carbon on the Oxygen Evolution Activity

Contact Info

Product

Resources

About

Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity

Micro Emulsion Synthesis of LaCoO₃Nanoparticles and their Electrochemical Catalytic Activity