Electrocatalytic activity of electrodeposited cobalt oxide films to produce oxygen gas from water

Nishizawa, Bungo; Nakamura, Kenta; Ikeda, Yuki; Yamaguchi, Takahiro; Takahashi, Kohshin

doi:10.1016/j.jelechem.2014.11.019

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…Postprocessing or additional species can endow Co‐based electrocatalysts prepared in the electrolytes with new property or improved OER activity. Cobalt oxide film prepared on an ITO‐coated substrate by anodic electrodeposition and treated at 450 °C was used as a WOC in the neutral electrolyte containing phosphate ions . It is also found that the cobalt‐oxide related electrocatalysts can be converted from H 2 ‐evolution catalyst to O 2 ‐evolution catalyst, which could be developed as a bifunctional water splitting catalyst .…”

Section: Nonprecious Metals Based Oer Electrocatalystsmentioning

confidence: 99%

Recent Advances in the Development of Water Oxidation Electrocatalysts at Mild pH

Zhao

Chen

et al. 2019

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Developing anodic oxygen evolution reaction (OER) electrocatalysts with high catalytic activities is of great importance for effective water splitting. Compared with the water‐oxidation electrocatalysts that are commonly utilized in alkaline conditions, the ones operating efficiently under neutral or near neutral conditions are more environmentally friendly with less corrosion issues. This review starts with a brief introduction of OER, the importance of OER in mild‐pH media, as well as the fundamentals and performance parameters of OER electrocatalysts. Then, recent progress of the rational design of electrocatalysts for OER in mild‐pH conditions is discussed. The chemical structures or components, synthetic approaches, and catalytic performances of the OER catalysts will be reviewed. Some interesting insights into the catalytic mechanism are also included and discussed. It concludes with a brief outlook on the possible remaining challenges and future trends of neutral or near‐neutral OER electrocatalysts. It hopefully provides the readers with a distinct perspective of the history, present, and future of OER electrocatalysts at mild conditions.

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Section: Nonprecious Metals Based Oer Electrocatalystsmentioning

confidence: 99%

Recent Advances in the Development of Water Oxidation Electrocatalysts at Mild pH

Zhao

Chen

et al. 2019

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241

138

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“…[8][9][10][11] Among all electrocatalysts reported the cobalt-containing oxides have been investigated due to their high performance for the OER. [12][13][14][15][16][17][18][19][20][21][22][23] On the other hand, cobalt oxides have been used in batteries and supercapacitive applications [24][25][26] as well as gas sensors. 27 Different paths have been investigated in order to enhance the electrocatalytic activity of the Co 3 O 4 such as: the development of new morphologies, 19,28 selection of different substrates 18 and the development of composite materials which include the use of graphene.…”

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confidence: 99%

Electrochemical Synthesis of Co₃O_4-xFilms for Their Application as Oxygen Evolution Reaction Electrocatalysts: Role of Oxygen Vacancies

Arciga-Duran

Meas

Pérez-Bueno

et al. 2018

J. Electrochem. Soc.

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Herein we report the synthesis of efficient Co 3 O 4 electrocatalysts toward the oxygen evolution reaction (OER) in alkaline media. Co 3 O 4 films were obtained by thermal treatment of Co electrodeposited from electrolytic solutions containing glycine at different pH values. Co 3 O 4 films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The grain size of the electrocatalysts decreases to 100 nm and the oxygen vacancies content increases, as the pH of the solution was increased during the synthesis. Linear Sweep voltammetry (LSV) and Chronopotentiometry techniques were employed to evaluate the electrocatalytic activity of the films. Co 3 O 4 electrocatalysts obtained at pH values higher than 7 exhibit a better electrocatalytic performance than the obtained at pH values less than 4, such as a potential to reach 1.5 mAcm −2 of 0.6 V and 0.68 mV, respectively. Co 3 O 4 synthesized under alkaline conditions exhibit the best charge transfer resistance with 4.3 during OER electrolysis. The improvement is associated to the presence of oxygen vacancies that promote the activity and stability of the electrocatalysts toward the OER. The electrochemical oxygen evolution reaction in alkaline media (OER:plays a key role in the efficient hydrogen production and solar refinery process. The OER is very important in several electrochemical technologies such as: water electrolyzers, solar water-splitting devices and rechargeable Li-Air Batteries.1-3 The OER involves a four electron transfer process and it is more challenging due to the slow kinetics, the high over-potentials and the low catalytic stability of the electrocatalysts. 4,5 It is well known that the efficient OER electrocatalysts such as Pt, Ir or Ru introduce high cost barriers to larger-scale applications because contain precious metals 6,7 however, electrocatalysts composed of earth-abundant and inexpensive materials are a promising alternative.Recently, the investigation and development of electrocatalysts for OER is based on the use of transition metals or their compounds, such as cobalt, nickel, iron, copper, zinc and manganese. [8][9][10][11] Among all electrocatalysts reported the cobalt-containing oxides have been investigated due to their high performance for the OER.12-23 On the other hand, cobalt oxides have been used in batteries and supercapacitive applications 24-26 as well as gas sensors. 27Different paths have been investigated in order to enhance the electrocatalytic activity of the Co 3 O 4 such as: the development of new morphologies, 19,28 selection of different substrates 18 and the development of composite materials which include the use of graphene. 3,23One of the recent approaches to increase the catalytic activity of single metal oxide catalysts is defect engineering by inducing impurities such as oxygen vacancies in metal oxides. In literature [29][30][31][32] it can be found that oxygen vacancies improve electrical conductivity, optical and reductive properties and ...

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Enhanced Water Oxidation Activity of the Cobalt(II,III) Oxide Electrocatalyst on an Earth‐Abundant‐Metal‐Interlayered Hybrid Porous Carbon Support

et al. 2016

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Supports over which electrocatalysts are deposited play a crucial role in the oxygen evolution reaction (OER), because they influence the surface roughness, morphology, electronic structure, and conductivity of electrocatalysts. In this context, we designed a hybrid carbon support having an earth‐abundant metal as an interlayer between a Co3O4 electrocatalyst and a carbon support. The present approach resulted in an electrode that was three dimensional with high porosity, provided low resistance to parallel electron conduction pathways through the metallic interlayer, and modulated the electrocatalytic activity of Co3O4 by affecting its electronic structure. To rationalize the effect of the metal interlayer, a range of non‐noble earth‐abundant metals (e.g. Cu, Mo, Ti, Al) were explored, of which the Cu‐modified carbon support resulted in maximum specific activity (i.e. activity per electrochemical surface area) for the OER. Whereas both the electronegativity and conductivity of the metal interlayer were found to influence the OER activity, the dominant controlling factor in the explored systems was conductivity. The specific activity of the OER of electrodeposited Co3O4 was found to have a near‐linear relationship between the electrical conductivity and the electron‐donor metals (e.g. Ti, Al) and another near‐linear relationship having different intercepts with electron‐acceptor metals (e.g. Cu, Mo, W). The above understanding can be useful in increasing the OER activity of electrocatalysts through support–electrocatalyst interactions.

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Electrocatalytic activity of electrodeposited cobalt oxide films to produce oxygen gas from water

Cited by 7 publications

References 28 publications

Recent Advances in the Development of Water Oxidation Electrocatalysts at Mild pH

Recent Advances in the Development of Water Oxidation Electrocatalysts at Mild pH

Electrochemical Synthesis of Co₃O_4-xFilms for Their Application as Oxygen Evolution Reaction Electrocatalysts: Role of Oxygen Vacancies

Enhanced Water Oxidation Activity of the Cobalt(II,III) Oxide Electrocatalyst on an Earth‐Abundant‐Metal‐Interlayered Hybrid Porous Carbon Support

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Electrocatalytic activity of electrodeposited cobalt oxide films to produce oxygen gas from water

Cited by 7 publications

References 28 publications

Recent Advances in the Development of Water Oxidation Electrocatalysts at Mild pH

Recent Advances in the Development of Water Oxidation Electrocatalysts at Mild pH

Electrochemical Synthesis of Co3O4-xFilms for Their Application as Oxygen Evolution Reaction Electrocatalysts: Role of Oxygen Vacancies

Enhanced Water Oxidation Activity of the Cobalt(II,III) Oxide Electrocatalyst on an Earth‐Abundant‐Metal‐Interlayered Hybrid Porous Carbon Support

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Electrochemical Synthesis of Co₃O_4-xFilms for Their Application as Oxygen Evolution Reaction Electrocatalysts: Role of Oxygen Vacancies