Electrodeposition of the Ni+MoS2 Composite Electrocatalysts

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.228.125 ◽

2015 ◽

Vol 228 ◽

pp. 125-131

Author(s):

B. Łosiewicz ◽

Grzegorz Dercz ◽

Magdalena Popczyk

Keyword(s):

Adsorption Mechanism ◽

Composite Coatings ◽

Chemical Characterization ◽

Deposition Process ◽

Metallic Nickel ◽

Plating Bath ◽

Physical And Chemical Characterization ◽

Physical And Chemical

The object of this work was to obtain the Ni+MoS2composite electrocoatings byin situco-deposition of molybdenum (IV) sulfide particles (< 2 μm) and nickel from a suspension plating bath. Physical and chemical characterization of the coatings was carried out using SEM, EDS, and XRD methods. The chemical composition of these coatings of a diphase structure (Ni, MoS2) was found to be dependent on the current density and temperature of electrodeposition. The optimal electrochemical conditions for embedding of the maximum amount of 26.4 wt.% of MoS2into the crystalline nickel matrix, were experimentally determined. The co-deposition process of MoS2particles and metallic nickel was discussed based on the adsorption mechanism. Such porous Ni+MoS2composite coatings can be proposed as electrode material for hydrogen electroevolution.

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Physical and Chemical Characterization of Ni+MoO2 Composite Electrocoatings

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.228.58 ◽

2015 ◽

Vol 228 ◽

pp. 58-62

Author(s):

B. Łosiewicz ◽

Grzegorz Dercz ◽

Magdalena Popczyk

Keyword(s):

Chemical Characterization ◽

Electrodeposition Technique ◽

Plating Bath ◽

Physical And Chemical Characterization ◽

Magnetic Stirring ◽

Physical And Chemical ◽

Crystalline Component ◽

Deposition Conditions

This work deals with the development of new electrochemical ways to improve the cathode activity towards hydrogen evolution reaction. Anin situcomposite electrodeposition technique has been proposed to obtain the porous Ni+MoO2coatings by simultaneous co-deposition of Ni and MoO2onto a Cu substrate from a nickel plating bath containing 10 g dm-3of MoO2powder suspended by magnetic stirring. Electrodeposition was conducted at 30°C at the deposition current density ofjd= 50-250 mA cm-2. SEM, EDS, and XRD measurements, were applied for physical and chemical characterization of the obtained coatings. It was found that by controlling the deposition conditions it was possible to obtain porous Ni+MoO2coatings containing from 10 to 15 at.% of MoO2. The XRD results confirmed their diphase structure with a polycrystalline Ni matrix into which a crystalline component in the form of MoO2particles was built-in.

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Physical and Chemical Characterization of In-Situ Burn Residue Encountered by a Deep-Water Fishery in the Gulf of Mexico

International Oil Spill Conference Proceedings ◽

10.7901/2169-3358-2017.1.1020 ◽

2017 ◽

Vol 2017 (1) ◽

pp. 1020-1040

Author(s):

Gary Shigenaka ◽

Buffy Meyer ◽

Edward Overton ◽

M. Scott Miles

Keyword(s):

Gulf Of Mexico ◽

Deep Water ◽

Chemical Characterization ◽

Deepwater Horizon ◽

Residual Oil ◽

Shrimp Fishery ◽

Physical And Chemical Characterization ◽

Physical And Chemical

2017-185 ABSTRACT The response technique of in-situ burning was used to great effect during the 2010 Deepwater Horizon oil spill in the Gulf of Mexico. An estimated 220,000-310,000 bbl of surface oil was consumed by operational in-situ burn activities. Post-burn residues were not recovered, as most were denser than seawater and sank after the burns. However, late in 2010, a relatively small deep-water shrimp fishery operating on the shelf north of the Macondo wellhead encountered tarballs on or near the bottom at around 200 m. We physically and chemically characterized samples of these submerged tarballs to confirm them as originating from Deepwater Horizon burns and to understand the features that distinguish them from other residual oil types encountered during the course of the spill response. The chance intersection between a commercial fishery and residues from the in-situ burn operations suggest that the fate of in-situ burn residue should be factored into future spill response tradeoff analyses.

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Electrodeposition Process of Composite Ni-P+Ni(OH)2+PTFE Coatings

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.228.108 ◽

2015 ◽

Vol 228 ◽

pp. 108-115

Author(s):

B. Łosiewicz ◽

Magdalena Popczyk

Keyword(s):

Steel Substrate ◽

Composite Coatings ◽

Low Carbon Steel ◽

Chemical Characterization ◽

Deposition Process ◽

Low Carbon ◽

X Ray Diffraction ◽

Physical And Chemical ◽

Galvanostatic Conditions

Co-deposition process of amorphous nickel and PTFE particles in the presence of Ni (OH)2carrier suspended in the bath by magnetic stirring, was investigated. Composite Ni-P+Ni (OH)2+PTFE coatings and comparative Ni-P deposits, were electrodeposited on low carbon steel substrate under galvanostatic conditions at room temperature. The physical and chemical characterization of the coatings was carried out using X-Ray diffraction analysis and microanalysis, stereometric quantitative microscopy and atomic absorption spectroscopy. The optimum production conditions of the composite coatings based on the Ni-P matrix into which PTFE and Ni (OH)2components can be embedded uniformly, were found.

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