Electrocatalysts for bifunctional oxygen/air electrodes

Nikolova, V.; Iliev, P.; Petrov, Κ.; Vitanov, T.; Zhecheva, E.; Stoyanova, Р.; Valov, Ilia; Stoychev, D.

doi:10.1016/j.jpowsour.2008.08.031

Cited by 88 publications

(58 citation statements)

References 36 publications

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“…This challenging concept envisages the generation of hydrogen and oxygen during charge (or the storage of energy) and the recombination back to water during discharge (or the release of stored energy) in a single cell. Despite an extensive literature on catalysts [17,166], at present, the energy efficiency is very poor, certainly <40%. Significant improvements are only probable when high performance alkaline water electrolysers have been achieved.…”

Section: Conclusion and The Futurementioning

confidence: 99%

Prospects for alkaline zero gap water electrolysers for hydrogen production

Pletcher

2011

International Journal of Hydrogen Energy

305

193

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Section: Conclusion and The Futurementioning

confidence: 99%

Prospects for alkaline zero gap water electrolysers for hydrogen production

Pletcher

2011

International Journal of Hydrogen Energy

305

193

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“…Spinels have been widely proposed as bifunctional oxygen electrocatalysts in alkaline media [1][2][3][4][5][6], but their performance at practical current densities is seldom reported. One reason is that to operate as a bifunctional electrode at high current densities, the electrocatalyst must be placed into a GDE structure that allows both a high flux of O2 to the catalyst sites during battery discharge and effective removal of O2 away from these sites during battery charge.…”

Section: Introductionmentioning

confidence: 99%

“…The comparison is based on experiments with RDE and the paper also contains performance data for GDE based on the preferred catalyst. 4 …”

Section: Introductionmentioning

confidence: 99%

Comparison of the Spinels Co 3 O 4 and NiCo 2 O 4 as Bifunctional Oxygen Catalysts in Alkaline Media

Pletcher

Price

et al. 2016

Electrochimica Acta

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Data from experiments with both rotating disc electrodes (RDEs) and gas diffusion electrodes (GDEs) are used to investigate the properties of the spinels, Co3O4 and NiCo2O4, as bifunctional oxygen electrocatalysts. Emphasis is placed on catalyst compositions and electrode structures free of carbon. Oxygen evolution and reduction occur at surfaces where the transition metals are in different oxidation states but the surface can be repeatedly cycled between these two states without significant change. It is shown that carbon-free, NiCo2O4 catalysed GDEs can be fabricated using structures based on stainless steel cloth or nickel foam. Those based on nickel foam can be cycled extensively and allow both O2 evolution and reduction at current densities up to 100 mA cm -2 .

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“…21 The choice of GDE as the model microreactor for studying the catalytic activity of the systems of interest was based on some of its advantages as compared to standard catalytic reactors. 12 For instance, GDEs allow expansion of the catalyst-electrolyte-gas contact surface, which in turn guarantees optimum utilization of the working catalyst surface, 22 as well as elimination of any side-processes (including corrosion processes). This is because the catalytic layer is isolated from the electrolyte.…”

Section: Introductionmentioning

confidence: 99%

“…This is because the catalytic layer is isolated from the electrolyte. 22 Characterization of Electrochemically Deposited Ce 1-x In view of the above considerations, the aim of this study was to establish the feasibility of a fast and simple method that does not require expensive equipment to evaluate the reactions of NO x reduction and CO oxidation, using GDE with incorporated electrochemically produced electrocatalytic active system Со x О y /Ce 1−x Zr x O 2 /SS.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Electrochemically Deposited Ce1-xZrxO2 Layers Modified with Cobalt Oxide for Electrocatalytic Conversion of NOx and CO

Tsanev¹

2014

Chem.Biochem.Eng.Q.

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A method for electrochemical deposition of a two-component Ce 1−x Zr x O 2 system on stainless steel substrate that is attractive from catalytic point of view is proposed. As reported in the literature, it is a promising carrier layer for the production of catalytic converters for purification of exhaust gases containing NO x and CO. This system is modified by electrodeposition of a thin film of cobalt oxide over it. A series of samples of the Ce 1−x Zr x O 2 /Со x О y system was produced with various concentrations and proportions of the components. These samples are characterized by XRD, SEM, EDS, XPS and РCС (partial electrocatalytic curves) of CO oxidation and of NО x reduction. Based on the obtained results, it has been concluded that the electrodeposited two-component Ce 1−x Zr x O 2 system is a solid solution with composition, structure, and physicochemical properties that make it suitable for use as active phase carrier for catalytic oxidation of CO and reduction of NO x .

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Electrocatalysts for bifunctional oxygen/air electrodes

Cited by 88 publications

References 36 publications

Prospects for alkaline zero gap water electrolysers for hydrogen production

Prospects for alkaline zero gap water electrolysers for hydrogen production

Comparison of the Spinels Co 3 O 4 and NiCo 2 O 4 as Bifunctional Oxygen Catalysts in Alkaline Media

Characterization of Electrochemically Deposited Ce1-xZrxO2 Layers Modified with Cobalt Oxide for Electrocatalytic Conversion of NOx and CO

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