Topic
Nickel
About: Nickel is a research topic. Over the lifetime, 79308 publications have been published within this topic receiving 1210058 citations. The topic is also known as: Ni & element 28.
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TL;DR: In this paper, the results on the electrochemical impedance spectroscopy and corrosion properties of electrodeposited nanostructured Al2O3-Ni composite coatings are presented.
153 citations
153 citations
TL;DR: In this article, nanostructural control of mixed-phase Ni2P/Ni12P5 (represented as NixPy) NPs prepared through the thermolysis of nickel acetylacetonate using trioctylphosphine (TOP) as a ligand and phosphorus precursor.
Abstract: Conversion of unary metal nanoparticles (NPs) upon exposure to oxygen, sulfur, selenium, and phophorus precursors usually produces hollow metal oxide, sulfide, selenide, or phosphide NPs through the Kirkendall effect Here, nanostructural control of mixed-phase Ni2P/Ni12P5 (represented as NixPy) NPs prepared through the thermolysis of nickel acetylacetonate using trioctylphosphine (TOP) as a ligand and phosphorus precursor is reported The P:Ni molar ratio controls the NP size and is the key factor in determining the nanostructure For P:Ni molar ratios of 1−3, nickel NPs form below 240 °C and subsequently convert to crystalline-hollow NixPy NPs at 300 °C For higher P:Ni ratios, a Ni-TOP complex forms that requires higher temperatures for NP growth, thus favoring direct formation of NixPy rather than nickel Consequently, for P:Ni molar ratios of >9, amorphous-solid NixPy NPs form at 240 °C and become crystalline-solid NixPy NPs at 300 °C For intermediate P:Ni molar ratios of ∼6, both growth mechanisms
153 citations
TL;DR: In this paper, a Ni nanoparticle catalyst was used to catalyze the reaction of dry reforming of methane (DRM) at 850°C and achieved a very high methane reforming rate (1840 −L−h−1−g−Ni−1 at 850 −C).
Abstract: A highly stable and extremely active nickel (Ni) nanoparticle catalyst, supported on porous γ-Al2O3 particles, was prepared by atomic layer deposition (ALD). The catalyst was employed to catalyze the reaction of dry reforming of methane (DRM). The catalyst initially gave a low conversion at 850 °C, but the conversion increased with an increase in reaction time, and stabilized at 93% (1730 L h−1 g Ni−1 at 850 °C). After regeneration, the catalyst showed a very high methane reforming rate (1840 L h−1 g Ni−1 at 850 °C). The activated catalyst showed exceptionally high catalytic activity and excellent stability of DRM reaction in over 300 h at temperatures that ranged from 700 °C to 850 °C. The excellent stability of the catalyst resulted from the formation of NiAl2O4 spinel. The high catalytic activity was due to the high dispersion of Ni nanoparticles deposited by ALD and the reduction of NiAl2O4 spinel to Ni during the DRM reaction at 850 °C. It was verified that NiAl2O4 can be reduced to Ni in a reductive gas mixture (i.e., carbon monoxide and hydrogen) during the reaction at 850 °C, but not by H2 alone.
152 citations
TL;DR: An electrical-pulse-heating technique has been used to heat iron and nickel to high temperatures to measure thermophysical properties in the liquid state to measure enthalpy, temperature, density, electrical resistivity, and sound speed.
Abstract: An electrical-pulse-heating technique has been used to heat iron and nickel to high temperatures to measure thermophysical properties in the liquid state. A dynamic technique was used because static techniques, which are capable of greater precision, fail at a relatively low temperature. Measurements have been made, and results are shown for enthalpy, temperature, density, electrical resistivity, and sound speed up to 3950 K in iron and 4250 K in nickel.
152 citations