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: Nickel catalysts derived from bis(1,5-cyclooctadiene)nickel [Ni(cod)(2)] and trialkylphosphines effect hydroarylation of alkynes through functionalization of C-H bonds of arenes including benzo-fused five-membered heteroarenes, pyridine-N-oxides, p Pyridines, 2-pyridones, and perfluoroarenes.
Abstract: Nickel catalysts derived from bis(1,5-cyclooctadiene)nickel [Ni(cod)2] and trialkylphosphines effect hydroarylation of alkynes through functionalization of C–H bonds of arenes including benzo-fused five-membered heteroarenes, pyridine-N-oxides, pyridines, 2-pyridones, and perfluoroarenes The reactions proceed with excellent stereo- and regioselectivity to give disubstituted arylethenes in good yields Use of Lewis acid (LA) co-catalysts is crucial for success in reactions of imidazoles, pyridines, and 2-pyridones; it is possible that coordination of the LA to the nitrogen or oxygen functionalities of such substrates increases the reactivity of their C–H bonds towards nickel(0) species DOI 101002/tcr201100023
202 citations
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TL;DR: Chitosan and Ca-alginate, derivatives of biopolymer, were separately prepared from crab chitin and algin in pellet form for adsorption of copper and nickel from aqueous solutions, along with a comparison made of these biopolymers with other adsorbents.
202 citations
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TL;DR: It is shown that bulk Ni sites in Ni and NiCo oxides are active and evolve oxygen via a NiOO− precursor, and Fe incorporation not only dramatically increases the activity, but also changes the nature of the active sites.
Abstract: Nickel iron oxide is considered a benchmark nonprecious catalyst for the oxygen evolution reaction (OER). However, the nature of the active site in nickel iron oxide is heavily debated. Here we report direct spectroscopic evidence for the different active sites in Fe-free and Fe-containing Ni oxides. Ultrathin layered double hydroxides (LDHs) were used as defined samples of metal oxide catalysts, and 18 O-labeling experiments in combination with in situ Raman spectroscopy were employed to probe the role of lattice oxygen as well as an active oxygen species, NiOO- , in the catalysts. Our data show that lattice oxygen is involved in the OER for Ni and NiCo LDHs, but not for NiFe and NiCoFe LDHs. Moreover, NiOO- is a precursor to oxygen for Ni and NiCo LDHs, but not for NiFe and NiCoFe LDHs. These data indicate that bulk Ni sites in Ni and NiCo oxides are active and evolve oxygen via a NiOO- precursor. Fe incorporation not only dramatically increases the activity, but also changes the nature of the active sites.
201 citations
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TL;DR: In this paper, the authors developed methods for the determination of 18 trace elements in sea water by neutron activation analysis, and sufficient analyses have been completed for gold, selenium, antimony, silver, cobalt and nickel to permit a discussion of their distributions in the world ocean.
201 citations