Bifunctional electrocatalyst for oxygen/air electrodes

Sasikala, N.; Ramya, K.; Dhathathreyan, K. S.

doi:10.1016/j.enconman.2013.10.010

Cited by 33 publications

(28 citation statements)

References 22 publications

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“…% Pd on carbon (0.5. mg cm O2 flow into the back of the electrodes, compared with data from gas diffusion electrodes in the literature catalysed by Ag nanoparticles (NP) [36] LaMnO3 [35] LaMnO3 (2) [34] LCCO perovskite [33], Pt/C JM (JM = Johnson Matthey) [32] Pt/C (Gaskatel GmbH) [9]. Charge discharge profiles of the Ni/Fe + Pd catalysed gas diffusion air electrodes at a current density of 300 -2000 mA cm -2 current density in 6 mol dm -3 KOH, with 100 ml min -1 O2 flow into the back of the electrodes.…”

Section: Discussionmentioning

confidence: 99%

“…The cyclic voltammetry was compared to voltammograms recorded in other publications in similar conditions for other gas diffusion air electrodes [32,33,34,35,36]. Figure 6 shows the data for two scans of the Ni/Fe + Pd air electrode, from the equilibrium potential (where j = 0) of +0.33 V vs. Hg/HgO, in the negative potential direction (ORR) and the positive direction (OER), compared with data from the literature.…”

Section: Electrochemical Analysis Of the Mixed Catalyst Oxygen Electrodementioning

confidence: 99%

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A high-performance, bifunctional oxygen electrode catalysed with palladium and nickel-iron hexacyanoferrate

McKerracher

Figueredo-Rodríguez

León

et al. 2016

Electrochimica Acta

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The development of air-breathing cathodes, which utilise atmospheric oxygen, enables the construction of lightweight, high energy density metal-air batteries and fuel cells. Air electrodes can be very lightweight and thin because the active material, oxygen, does not need to be stored inside the cell. However, air electrodes are restricted by poor reaction kinetics and low activity of many catalysts towards the oxygen evolution and reduction reactions. In addition, it is a challenge to maintain chemical and mechanical stability of the catalyst and supporting materials at oxidising currents under the strong alkaline conditions commonly used, and gas evolution. This paper reports a novel bifunctional oxygen electrode with remarkable stability, able to perform at current densities up to 1,000 mA cm -2 and withstand 3,000 cycles continuously. The electrode is catalysed by a mixture of Pd/C and mixed nickel-iron hexocyanoferrate, which have high activities towards the ORR and OER reactions, respectively.

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Section: Discussionmentioning

confidence: 99%

Section: Electrochemical Analysis Of the Mixed Catalyst Oxygen Electrodementioning

confidence: 99%

A high-performance, bifunctional oxygen electrode catalysed with palladium and nickel-iron hexacyanoferrate

McKerracher

Figueredo-Rodríguez

León

et al. 2016

Electrochimica Acta

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“…It is apparent in the literature on bifunctional air electrodes in general that although a large number of publications study bifunctional catalysts deposited onto the surface of rotating disk electrodes (RDEs) in oxygen saturated solution (for recent publications see the references [6,[18][19][20][21][22]), there is a much more limited number of publications which look at the properties of such catalysts when they are on the surface of complete gas diffusion electrodes [7][8][9]17,23].…”

Section: Introductionmentioning

confidence: 99%

A nanostructured bifunctional Pd/C gas-diffusion electrode for metal-air batteries

McKerracher

Alegre

Baglio

et al. 2015

Electrochimica Acta

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Keywords:bifunctional air electrode palladium catalyst metal-air battery A B S T R A C T Designing a bifunctional air electrode which catalyses both the oxygen reduction and oxygen evolution reactions is an essential part of progress towards fully rechargeable metal-air batteries, such as the ironair battery which is environmentally friendly, low cost, and does not suffer risk of thermal runaway like lithium-ion batteries. This paper reports the development of a lightweight carbon-based bifunctional air electrode, catalysed by a small (0.5 mg cm À2 ) loading of 30 wt.% palladium on carbon. The Pd-catalysed air electrode showed good bifunctional activity, with 0.53 V potential difference between oxygen reduction and evolution. The Pd/C air electrode showed improved catalytic activity at high current densities (! 50 mA cm À2) and enhanced durability compared with two commercial Pt/C air electrodes produced by Gaskatel GmbH and Johnson Matthey. A stable oxygen evolution potential was maintained over 1,000 charge-discharge cycles.Crown

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“…Typical alternative metallic catalysts are included with several metals such as silver (Ag), 11,12 gold, 13,14 palladium, 15,16 nickel, 17,18 cobalt, 19,20 porphyrin, 21,22 and manganese 23,24 have been studied.…”

mentioning

confidence: 99%

“…Typical alternative metallic catalysts are included with several metals such as silver (Ag), 11,12 Among these options, Ag, being relatively inexpensive and abundant, is a promising candidate as a cathode electrode catalyst for FCs. It has been reported that the 20% Ag/C catalyst shifts toward negative potentials by about 50 mV in comparison with the onset potential of the 20% Pt/C catalyst and better tolerance toward methanol.…”

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confidence: 99%

Various Carbon Chain Containing Linkages Grafted Graphene with Silver Nanoparticles Electrocatalysts for Oxygen Reduction Reaction

Lee

Ahmed

Jeon

2014

J. Electrochem. Soc.

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In this study, we have synthesized an efficient catalyst by various carbon chain containing linkers grafted graphene with silver nanoparticles (AgNPs)-decorated GO-S-(CH 2 ) x -SH (where x = 2, 3, 4 and denoted as GO-C x -Ag) for oxygen reduction reaction (ORR). The structural and morphological properties have investigated via several instrumental methods. Among those catalysts, the GO-C 2 -Ag has showed an excellent electrocatalytic performance by cyclic voltammetry (CV) and hydrodynamic techniques for ORR in alkaline media. Hydrodynamic voltammetry reveals that the GO-C 2 -Ag modified electrode has catalyzed effectively at higher potential. The overall electrocatalytic results showed that the GO-C 2 -Ag has better activity toward ORR and demonstrated nearly four electron transfer pathway into H 2 O due to much grafting of linker molecule and smaller size of AgNPs. The value of transferred electron number (n) and other kinetic parameters have demonstrated that the GO-C 2 -Ag is highly facilitated than that of GO-Ag and other GO-C x -Ag to electrocatalytic oxygen reduction. Graphene, which is discovered by Geim's group in UK in 2004, is composed of a single sheet of conjugated sp 2 carbon atoms packed into a honeycomb crystal structure.1 It is an attractive material due to its unique physical and chemical properties such as its outstanding thickness, tensile strength (130 Gpa), thermal conductivity (5,300 W/mK), allowable current density (108 A/cm 2 ), and mobility (200,000 cm 2 /Vs). 2-5 However, the oxidized graphene (GO) surface is highly functionalized with oxygenated groups, such as ketones, epoxides, hydroxyls and carboxylates, 6 which make them targets for covalent modification. Graphene has been recognized and used as an important material in various technologies in chemistry such as, displays, rechargeable batteries, solar cells, automobiles, fuel cells (FCs). 7 In recent years, due to global warming, energy issues are in the spotlight. Thus, many studies have been conducted on carbon nanomaterials supported metal nanoparticles (NPs) for both anodic and cathodic reactions in FCs including oxygen reduction reaction (ORR).ORR is important for energy conversion systems in FCs 7,8 and metal air batteries. 9 It is well-known that a platinum (Pt)-based catalyst in an acidic solution has the highest chemical stability among electrochemically active catalysts. However, Pt-based catalysts are too expensive to make FCs commercially viable. Under acidic conditions, due to the high dissociation energy (494 kJ/mol) of oxygen molecules, electrochemical oxygen reduction requires a high overpotential, and the reaction rate is slow.10 Moreover, Pt has suffered several problems such as, poor drivability and toxic effects of methanol crossover/carbon monoxide in direct methanol fuel cells (DMFCs).In the last few years, because of these shortcomings of Pt-based electrocatalysts, studies have been conducted to develop alternative non Pt catalysts. Typical alternative metallic catalysts are included with several metals such ...

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Bifunctional electrocatalyst for oxygen/air electrodes

Cited by 33 publications

References 22 publications

A high-performance, bifunctional oxygen electrode catalysed with palladium and nickel-iron hexacyanoferrate

A high-performance, bifunctional oxygen electrode catalysed with palladium and nickel-iron hexacyanoferrate

A nanostructured bifunctional Pd/C gas-diffusion electrode for metal-air batteries

Various Carbon Chain Containing Linkages Grafted Graphene with Silver Nanoparticles Electrocatalysts for Oxygen Reduction Reaction

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