Insight the effect of surface Co cations on the electrocatalytic oxygen evolution properties of cobaltite spinels

Tan, Yuan; Wu, Congcong; Lin, Hong; Li, Jianbao; Chi, Bo; Pu, Jian; Li, Jian

doi:10.1016/j.electacta.2013.12.128

Cited by 52 publications

(32 citation statements)

References 25 publications

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“…The structural modification of the surface occurring upon cycling is furthermore accompanied by a decrease of the activity of the catalyst towards the OER as shown in Figure 5b. 52 This assertion is furthermore in good agreement with results obtained with pure NiO phase ( Figure S3). Such enrichment would be responsible for an increase of the surface wettability, which in some extent might increase the catalytic activity of the material towards OER upon cycling.…”

Section: Resultssupporting

confidence: 90%

Electrochemically induced surface modifications of mesoporous spinels (Co₃O_4−δ, MnCo₂O_4−δ, NiCo₂O_4−δ) as the origin of the OER activity and stability in alkaline medium

et al. 2015

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Electronic Supplementary Information (ESI) available: [N2-sorption measurements performed with SBA-15 used as hard template for the synthesis of mesoporous oxides. Pdf data obtained from the characterization of MnCo2O4-δ, NiCo2O4-δ, Co3O4-δ, NiO materials. Voltammogram recorded in supporting electrolyte (KOH 0.1 M) under N2 atmosphere at a scan rate of 50 mV s -1 with mesoporous NiO catalyst at room temperature. Overlay of EIS bode plots for Co3O4-δ and NiCo2O4-δ at 1.800 V vs. RHE]. SeeAbstract: Co3O4-δ, MnCo2O4-δ, NiCo2O4-δ materials were synthesized using a nanocasting process consisting in replicating a SBA-15 hard template. Catalysts powders obtained were characterized using different physico-chemical techniques (X-ray scattering, transmission electron microscopy, N2 physisorption and X-ray photoelectron spectroscopy) in order to deeply characterize their morphostructural properties. Electrochemical measurements performed with cyclic voltammetry and electrochemical impedance spectroscopy techniques have shown that these catalysts were liable to surface modifications induced by the applied electrode potential. These surface structural modifications as well as their effect on the electroactivity of the catalyst towards the OER in alkaline medium are discussed. The activated NiCo2O4-δ material showed particularly excellent catalytic ability towards the OER in 0.1 M KOH electrolyte In this material Co (IV) is found to be the active species in the catalyst composition for the OER. It exhibits an overpotential as low as 390 mV at a current density of 10 mA cm -2 . This catalytic activity is especially high since the oxide laoding is only of 0.074 mg cm -2 . Furthermore, this anode catalyst showed high stability during an accelerated durability test of 1500 voltammetric cycles.Please do not adjust margins Please do not adjust margins region at three potential values (0.7; 0.8 and 1 V vs. RHE) for each catalyst.

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Section: Resultssupporting

confidence: 90%

Electrochemically induced surface modifications of mesoporous spinels (Co₃O_4−δ, MnCo₂O_4−δ, NiCo₂O_4−δ) as the origin of the OER activity and stability in alkaline medium

et al. 2015

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“…Attractive magnetic properties (large coercivity, magneto-crystalline anisotropy and magnetostriction [9]) make cobalt-iron spinel oxides, especially in thin films form, potential candidates for magnetic devices. In addition, spinel cobaltites are also of interest for various applications due for example to their thermoelectric [10,11], multiferroic [12,13] or catalytic [14,15] properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation of iron cobaltite thin films by RF magnetron sputtering

et al. 2015

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International audienceIron cobaltite thin films with spinel structure have been elaborated by radio-frequency (RF) magnetronsputtering from a Co1.75Fe1.25O4 target. Influence of argon pressure on structure, microstructure and physicalproperties of films has been examined. Iron–cobalt oxide thin films essentially consist of one spinel phasewhen deposited at low pressure (0.5 and 1.0 Pa). At high pressure (2.0 Pa), the global stoichiometry of the filmis changed which results in the precipitation of a mixed monoxide of cobalt and iron beside the spinel phase.This in-situ reduction due to an oxygen loss occurring mainly at high deposition pressure has been revealed byX-ray diffraction and Raman spectroscopy. Microstructural evolution of thin film with argon pressure has beenshown by microscopic observations (AFM and SEM). The evolution of magnetic and electrical properties, versusargon pressure, has been also studied by SQUID and 4 point probe measurements

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“…It should be ascribed to high loadings of the active substance Co into the 3D CNF networks (for details of the Co, C and O content in CNF@Co see Table S3). However, a close inspection on the LSV curves of CNF@Co-0.2 M and CNF@Co-0.15 M indicates that only a slightly enhanced current at the high overpotential was observed for CNF@Co-0.2 M. This should be explained by the fact that most of the charge is mainly transferred at the surface or in the bulk near the surface of the electrode material [40,41]. Meanwhile, it has been documented that Co element in high oxidation states are particularly important in achieving high OER activity.…”

Section: Resultsmentioning

confidence: 69%

Three-dimensional porous carbon nanofiber networks decorated with cobalt-based nanoparticles: A robust electrocatalyst for efficient water oxidation

Cao

Yan

Liu

et al. 2015

Carbon

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Insight the effect of surface Co cations on the electrocatalytic oxygen evolution properties of cobaltite spinels

Cited by 52 publications

References 25 publications

Electrochemically induced surface modifications of mesoporous spinels (Co₃O_4−δ, MnCo₂O_4−δ, NiCo₂O_4−δ) as the origin of the OER activity and stability in alkaline medium

Electrochemically induced surface modifications of mesoporous spinels (Co₃O_4−δ, MnCo₂O_4−δ, NiCo₂O_4−δ) as the origin of the OER activity and stability in alkaline medium

Preparation of iron cobaltite thin films by RF magnetron sputtering

Three-dimensional porous carbon nanofiber networks decorated with cobalt-based nanoparticles: A robust electrocatalyst for efficient water oxidation

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Insight the effect of surface Co cations on the electrocatalytic oxygen evolution properties of cobaltite spinels

Cited by 52 publications

References 25 publications

Electrochemically induced surface modifications of mesoporous spinels (Co3O4−δ, MnCo2O4−δ, NiCo2O4−δ) as the origin of the OER activity and stability in alkaline medium

Electrochemically induced surface modifications of mesoporous spinels (Co3O4−δ, MnCo2O4−δ, NiCo2O4−δ) as the origin of the OER activity and stability in alkaline medium

Preparation of iron cobaltite thin films by RF magnetron sputtering

Three-dimensional porous carbon nanofiber networks decorated with cobalt-based nanoparticles: A robust electrocatalyst for efficient water oxidation

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Product

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Electrochemically induced surface modifications of mesoporous spinels (Co₃O_4−δ, MnCo₂O_4−δ, NiCo₂O_4−δ) as the origin of the OER activity and stability in alkaline medium

Electrochemically induced surface modifications of mesoporous spinels (Co₃O_4−δ, MnCo₂O_4−δ, NiCo₂O_4−δ) as the origin of the OER activity and stability in alkaline medium