Mesoporous Co3O4 as an electrocatalyst for water oxidation

Tüysüz, Harun; Hwang, Yun Jeong; Khan, Sher Bahadar; Asiri, Abdullah M.; Yang, Peidong

doi:10.1007/s12274-012-0280-8

Cited by 267 publications

(111 citation statements)

References 54 publications

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“…5b) demonstrates the superior catalytic activity and efficient electron/mass transfer in CoCN@PZS-450°C. The performance of CoCN@PZS-450°C is better than those reported recently under the same conditions [44,45] and comparable to those performed in 0.1 mol L −1 KOH aqueous solutions [46][47][48][49] (Table 1). Moreover, a very small decay of the current density after continuous CV scanning for 1,000 cycles demonstrates very good electrochemical stability, partially ascribed to the presence of an outer C-rich protecting layer.…”

Section: Resultssupporting

confidence: 80%

Carbon skeleton doped with Co, N, S and P as efficient electrocatalyst for oxygen evolution reaction

et al. 2018

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Section: Resultssupporting

confidence: 80%

Carbon skeleton doped with Co, N, S and P as efficient electrocatalyst for oxygen evolution reaction

et al. 2018

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“…The oxygen evolution reaction (OER) is an important half-reaction of the water-splitting reaction [1][2][3][4]. The other simultaneous half-reaction (HER) produces hydrogen [5][6][7][8], a clean energy that can slightly ease the tension caused by fossil fuels.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of Fe/Ni bimetallic oxide solid-solution nanoparticles with superior electrocatalytic activity for oxygen evolution reaction

et al. 2015

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The sluggish oxygen evolution reaction (OER) is an important half-reaction of the electrochemical water-splitting reaction. Amorphous Fe/Ni composite oxides have high activity. In this work, we modified the aerosol spray-assisted approach and obtained amorphous Fe-Ni-O x solid-solution nanoparticles (Fe-Ni-O x -NPs) approximately 20 nm in size by choosing iron/nickel acetylacetonates as raw materials instead of inorganic salts. The small-sized Fe-Ni-O x -NPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis, energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). Furthermore, an investigation of electrochemical OER performance suggests that the small-sized Fe-Ni-O x -NPs have higher activity than the large-sized Fe-Ni-O x -MPs. A small overpotential of 0.315 V was demanded to obtain a working current density of 50 mA/cm 2 , and the Tafel slope was as low as 38 mV/dec.

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“…4 Tafel plot of overpotential against ln(surface area per gram) based on the nanoparticle's geometric surface area (assuming the nanoparticles to be roughly spherical). The error bars in the y-axis show standard deviation in the mean based on repeat measurements of each point, the error bars in the x-direction show error in the ln(surface area) based on propagation of the standard deviation of the measured particle size distribution previous studies have focussed on practical electrode designs (such as deposition within a conducting foam) [20,21] or innovative porous cobalt materials [24], but it is not clear how much of the cobalt remains accessible for catalysis. In the present case the cobalt nanoparticles have instead been loaded directly on a flat working electrode surface and with a concentration at which most of the surface area of the nanoparticles is accessible (at most a few layers deep allowing diffusion between them).…”

Section: Resultsmentioning

confidence: 99%

Catalysis of the Oxygen Evolution Reaction by 4–10 nm Cobalt Nanoparticles

2018

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Electrolysis of water is key technology, not only for clean energy production, but to ensure a continued supply of hydrogen beyond fossil resources, essential to the manufacture of many chemical goods other than fuels. Cobalt nanomaterials have been widely identified as a promising candidate for the anode (oxygen evolution) reaction in this process, but much work has focused on applied materials or electrode design. Given the importance of oxidation state changes Co(III) → Co(IV) in the accepted reaction mechanism, in this work we look at size effects in small (4-10 nm) cobalt nanoparticles, where the ease of oxidation for lower cobalt oxidation states is known to change with particle size. To discriminate between geometric and chemical effects we have compared the catalysts in this study to others in the literature by turnover frequency (widely used in other areas of catalysis), in addition to the more commonly employed performance metric of the overpotential required to produce a current density of 10 mA cm −2 . Comparisons are drawn to key examples of using well defined nanomaterials (where the surface are of cobalt sites can be estimated). This has enabled an estimated intrinsic turnover rate of ~ 1 O 2 molecule per surface Co atom per second at an overpotential of 500 mV in the oxygen evolution reaction under typical alkaline reaction conditions (pH 14.0) to be identified.

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Mesoporous Co3O4 as an electrocatalyst for water oxidation

Cited by 267 publications

References 54 publications

Carbon skeleton doped with Co, N, S and P as efficient electrocatalyst for oxygen evolution reaction

Carbon skeleton doped with Co, N, S and P as efficient electrocatalyst for oxygen evolution reaction

Facile synthesis of Fe/Ni bimetallic oxide solid-solution nanoparticles with superior electrocatalytic activity for oxygen evolution reaction

Catalysis of the Oxygen Evolution Reaction by 4–10 nm Cobalt Nanoparticles

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