Synthesis, characterization of a CoSe2 catalyst for the oxygen reduction reaction

Heterogeneous material consisting of tube type TiO 2 was grown in the presence of CoSe 2 /graphene hybrid as a high-performance photocatalyst material through fast microwave assisted technique. The prepared composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopic analysis, UV-vis absorbance spectra and UV-vis diffuse reflectance spectra (DRS) analysis were obtained. The hydrogen evolution rate for ternary composites was found markedly high as compare to bare TiO 2 and binary CoSe 2 /graphene composites. This extraordinary photocatalytic activity for hydrogen evolution arises from the positive synergetic effect between the CoSe 2 and graphene components in our heterogeneous system. The optical properties were also observed to be effected by the different weight % of graphene in the composites by observing their respective band gaps from DRS spectra.

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“…(6). The difference in the Raman band intensity or shift provides information about the nature of the defects and C-C bonds [25][26]. Fig.…”

Section: Growth and Characterization Of Cose 2 /Graphene-tio 2 Nanocomentioning

confidence: 99%

Microwave synthesis of a CoSe₂/graphene–TiO₂ heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

Ullah

Zhu

et al. 2015

RSC Adv.

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“…The peaks were identified from the XRD patterns with JCPDS data (JCPDS 89–2002) for CoSe 2 . Furthermore, the existence of (210), (211), and (311) diffraction peaks proved that the pyrite CoSe 2 structure exists . In addition, no measurable peaks of other phases or impurities were detected.…”

Section: Resultsmentioning

confidence: 88%

Influence of selenization temperature on synthesis, morphology, and properties of nanostructured CoSe₂ films

Shi

Kao

et al. 2015

Crystal Research and Technology

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Nanostructured cobalt selenide (CoSe 2 ) thin films were deposited on a glass substrate using the selenization of Co films at different selenization temperatures (300°C, 400°C, and 500°C) in a pure Se vapor for two hours. The morphology and structure of the as-deposited films shows that the film morphology and crystallinity are affected by the selenization temperature. Increasing the selenization temperature from 300°C to 400°C and 500°C results in a change in the surface and cross sectional morphology. At 300°C, the Co films have an almost amorphous structure, while at temperatures of 400 and 500°C, the Co films have a crystalline nanostructure with bilayered morphology. Optical analyses of the CoSe 2 films at 500°C show a large absorption (α > 1.0 × 10 5 cm −1 ) and a direct band gap (ß1.0 eV).

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“…41‐1471), which confirms the formation of CoS 2 within the final composites (CoS 2 @NSC/CFP). Raman spectroscopy was used to characterize CoS 2 @NSC/CFP (Figure S6), and the peaks at

\overset{ν}{true}

=290 and 390 cm −1 are in close agreement with previous results for CoS 2 single crystals (Figure S8) . In addition, the XRD patterns of CoS 2 ‐ns/CFP and CoS 2 ‐np/CFP presented in Figure S7 demonstrate that the structures of the two samples can be assigned to CoS 2 and the CFP.…”

Section: Resultsmentioning

confidence: 99%

Controllable Synthesis of CoS₂@N/S‐Codoped Porous Carbon Derived from ZIF‐67 for as a Highly Efficient Catalyst for the Hydrogen Evolution Reaction

Shi

Huo

et al. 2018

ChemCatChem

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A convenient, controllable method to fabricate an electrode is necessary to achieve the practical application of a hydrogen evolution reaction (HER) catalyst. In this work, an electrodeposition–ZIF conversion–sulfuration strategy is developed to produce a CoS2@N/S‐codoped porous carbon (CoS2@NSC/CFP) to drive the HER efficiently. CoS2@NSC/CFP was prepared by the electrodeposition of Co(OH)2 on a carbon fiber paper followed by conversion into ZIF‐67 and subsequent sulfuration with sulfur. The loading of electroactive components can be controlled easily in the range of 0.7–10.0 mg cm−2 by varying electrodeposition time from 5 min to 2 h. The resulting material can be employed directly as a working electrode for the HER and it shows an excellent catalytic activity and stability with an overpotential of 95 mV at 10 mA cm−2 and 158 mV to reach 100 mA cm−2 in an acidic medium. The high efficiency is related intimately to the high dispersion of ultra‐small CoS2 nanoparticles, heteroatom‐codoping, and the 3 D porous network configuration of the carbon fiber paper.

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Synthesis, characterization of a CoSe2 catalyst for the oxygen reduction reaction

Cited by 54 publications

References 21 publications

Microwave synthesis of a CoSe₂/graphene–TiO₂ heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

Microwave synthesis of a CoSe₂/graphene–TiO₂ heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

Influence of selenization temperature on synthesis, morphology, and properties of nanostructured CoSe₂ films

Controllable Synthesis of CoS₂@N/S‐Codoped Porous Carbon Derived from ZIF‐67 for as a Highly Efficient Catalyst for the Hydrogen Evolution Reaction

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Synthesis, characterization of a CoSe2 catalyst for the oxygen reduction reaction

Cited by 54 publications

References 21 publications

Microwave synthesis of a CoSe2/graphene–TiO2 heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

Microwave synthesis of a CoSe2/graphene–TiO2 heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

Influence of selenization temperature on synthesis, morphology, and properties of nanostructured CoSe2 films

Controllable Synthesis of CoS2@N/S‐Codoped Porous Carbon Derived from ZIF‐67 for as a Highly Efficient Catalyst for the Hydrogen Evolution Reaction

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Microwave synthesis of a CoSe₂/graphene–TiO₂ heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

Microwave synthesis of a CoSe₂/graphene–TiO₂ heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

Influence of selenization temperature on synthesis, morphology, and properties of nanostructured CoSe₂ films

Controllable Synthesis of CoS₂@N/S‐Codoped Porous Carbon Derived from ZIF‐67 for as a Highly Efficient Catalyst for the Hydrogen Evolution Reaction