A comparative study of the oxygen evolution reaction on oxidised nickel, cobalt and iron electrodes in base

Lyons, Michael E. G.; Brandon, Michael

doi:10.1016/j.jelechem.2009.11.024

Cited by 320 publications

(238 citation statements)

References 79 publications

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“…In contrast, Xu et al [52] and Lyons and Brandon [16] observed an increase of C1 with electrode ageing for carbon steel and polycrystalline iron oxide, respectively. In case of polycrystalline iron oxide, the peak C1 was only detected on one particular electrode [16] and C1 is not a common feature in the CVs of polycrystalline iron oxide [14][15][16]18,51,56]. In our study the peak C1 decreases and finally disappears with electrode ageing but in contrast to Xu et al [52] the peak C1 is seen over many cycles (Fig.…”

Section: Voltammetric Responsecontrasting

confidence: 64%

“…Changes in peak heights and peak potentials have commonly been observed in the CVs of polycrystalline iron oxides upon ageing [14,49,55,56]. Thus, the changes observed in the CV of Fe 2 O 3,NW are not surprising since electrode ageing changes the surface redox processes.…”

Section: Voltammetric Responsementioning

confidence: 91%

“…2a), the peak A2 was reported to increase continuously with potential cycling for polycrystalline iron oxides [15][16][17]49,56]. It might be speculated, that the differences seen on Fe 2 O 3,NW with respect to C1 and A2 at polycrystalline iron oxides [15][16][17]49,52,53,56] are linked to the appearance of C2, C3, C5 because those signals have not been reported for polycrystalline iron oxide electrodes.…”

Section: Voltammetric Responsementioning

confidence: 96%

See 2 more Smart Citations

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Bülter

Denuault

Mátéfi‐Tempfli

et al. 2016

Electrochimica Acta

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Section: Voltammetric Responsecontrasting

confidence: 64%

Section: Voltammetric Responsementioning

confidence: 91%

Section: Voltammetric Responsementioning

confidence: 96%

See 1 more Smart Citation

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Bülter

Denuault

Mátéfi‐Tempfli

et al. 2016

Electrochimica Acta

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“…Friebel et al [19] also reported that (Ni, Fe)OOH as an electrocatalyst for water splitting exhibited good activity in the OER. Furthermore, according to the published mechanism [21], hydrous anodic oxides with amphoteric character like cobalt-based and nickel-based catalysts possess higher activity.…”

Section: Introductionmentioning

confidence: 99%

IrNi nanoparticle-decorated flower-shaped NiCo2O4 nanostructures: controllable synthesis and enhanced electrochemical activity for oxygen evolution reaction

et al. 2016

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In this work, we demonstrated the enhanced oxygen evolution reaction (OER) activity of flower-shaped cobalt-nickel oxide (NiCo2O4) decorated with iridium-nickel bimetal as an electrode material. The samples were prepared by carefully depositing pre-synthesized IrNi nanoparticles on the surfaces of the NiCo2O4 nano-flowers. Compared with bare NiCo2O4, IrNi, and IrNi/Co3O4, the IrNi/NiCo2O4 exhibited significantly enhanced electrocatalytic activity in the OER, including a lower overpotential of 210 mV and a higher current density at an overpotential of 540 mV. We found that the IrNi/NiCo2O4 showed more efficient electron transport behavior and reduced polarization because of its bimetal IrNi modification by analyzing its Tafel slope and turnover frequency. Furthermore, the electrocatalytic mechanism of IrNi/NiCo2O4 in the OER was studied, and it was found that the combined active sites of the composite effectively improved the rate determining step. The synergic effect of the bimetal and metal oxide plays an important role in this reaction, enhancing the transmission efficiency of electrons and providing more active sites for the OER. The results reveal that IrNi/NiCo2O4 is an excellent electrocatalyst for OER.

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“…Considering the model developed by McDonald and Conway, 36 in which only a fraction of the total surface potential as being responsible for lowering the potential barrier for electron transfer, and the rest appears across an electronically conducting oxide layer, it is possible to envision the iron complexes formed on the surface as the responsible for the first fraction of the potential across the electrode/electrolyte interface, lowering the electron transfer barrier, and the cobalt oxides representing the conducting oxide barrier; then, we would have a case of a dual barrier condition with mixed transition metal ions. A detailed discussion by Lyons and Brandon, 37 concludes that under dual barrier conditions a reaction order of unity with a Tafel slope of ∼50 mV/decade could be accounted for by the observed parameters. This hypothesis is consistent with the discussion by Matsumoto and Sato about the factors contributing to the electrocatalysis of the OER in which the band structure affects the electron transfer, and the bond strength of M-OH and the number of d-electrons affect the steps related to the adsorbed species.…”

Section: Mechanism Imentioning

confidence: 99%

The Influence of Fe Substitution in Lanthanum Calcium Cobalt Oxide on the Oxygen Evolution Reaction in Alkaline Media

Abreu-Sepúlveda

Dhital

Huq

et al. 2016

J. Electrochem. Soc.

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The effect due to systematic substitution of cobalt by iron in La 0.6 Ca 0.4 CoO 3 perovskites on the oxygen evolution reaction (OER) in alkaline media has been investigated. These compounds were synthesized by a facile glycine-nitrate synthesis and the phase formation was confirmed by X-ray and neutron powder diffraction analysis. The apparent OER activity was evaluated by quasisteady state current measurements in alkaline media using a traditional three-electrode system. X-ray photoelectron spectroscopy shows an increase in Fe substitution causes an increase in the surface concentration of various Co oxidation states. A Tafel slope in the vicinity of 60 mV/decade and electrochemical reaction order for OH − near unity were found for the unsubstituted compounds. A decrease in the Tafel slope to 49 mV/decade was observed when iron is incorporated in high amounts in the perovskite structure. The area specific current density showed dependence on the Fe fraction; however, the dependence of specific current density with Fe fraction is not linear. We believe that the iron incorporation in the La 0.6 Ca 0.4 CoO 3 perovskites decreases the electron transfer barrier and facilitates the formation of cobalt-hydroxides. Among the goals of modern renewable energy systems is to convert the available resources into clean forms of stored energy to alleviate the crisis of fossil fuel exhaustion and oil dependence for energy production. New battery technologies could be the key to the development of a cost-efficient renewable energy sources. Batteries are important because they allow us a method to store electric power for redistribution during the time when it is not readily available. Recently, there has been a great demand for high energy density storage devices such as metal-air batteries for stationary and electric vehicle applications.1,2 In order to develop high energy density rechargeable metal-air batteries, there is a critical need to design bifunctional oxygen electrodes capable of meeting the following essential requirements i) reduce oxygen from the atmosphere during discharging, ii) effectively dissociate the discharged oxygen products, e.g., the OER, during charging, iii) utilize low overpotential for both processes. The OER is the primary anodic process in water electrolyzers and metal-air batteries and is the main cause for energy losses and low efficiencies in these technologies due to the high overpotential required to achieve a suitable performance for functional applications.3,4 The best performing materials are associated with oxides containing noble transition metal ions such as osmium, 5 ruthenium, 6-9 iridium, and platinum-gold mixtures. 10 The increased cost of these electrocatalysts due to their scarcity in the Earth's crust makes them impractical for commercial applications. 11Therefore, efforts are dedicated toward the development of inexpensive catalytic materials for the OER as well as to understand their structural relationship with respect to the OER mechanism.Several ternary transition metal per...

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A comparative study of the oxygen evolution reaction on oxidised nickel, cobalt and iron electrodes in base

Cited by 320 publications

References 79 publications

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

Electrochemical analysis of nanostructured iron oxides using cyclic voltammetry and scanning electrochemical microscopy

IrNi nanoparticle-decorated flower-shaped NiCo2O4 nanostructures: controllable synthesis and enhanced electrochemical activity for oxygen evolution reaction

The Influence of Fe Substitution in Lanthanum Calcium Cobalt Oxide on the Oxygen Evolution Reaction in Alkaline Media

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