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 article, the most probable mechanism of hydrogen overpotential at nickel cathodes is that of a rate-determining discharge step followed by a recombination of hydrogen atoms.
Abstract: Hydrogen overpotential at nickel cathodes has been measured under very pure conditions in aqueous solutions of hydrogen chloride (0.001N − 1.0N) and in aqueous sodium hydroxide (0.001N − 0.2N). The measurements have been made in the current density range 10−8 − 10−1 amp/apparent cm2, and in the temperature range 0°—50°C. Observations were also made of the buildup and rate of decay of overpotential and of the capacity of the electrode/electrolyte interface. Direct measurements were made of the number of acts of the rate‐determining step associated with one act of the over‐all hydrogen evolution reaction (i.e., the stoichiometric number μ). The application of μ has been extended to hydrogen overpotentials greater than about − 20 millivolts. The experimental data were treated statistically and show that the most probable mechanism of hydrogen overpotential at nickel cathodes is that of a rate‐determining discharge step followed by a recombination of hydrogen atoms. The discharge probably takes place from hyd...
169 citations
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169 citations
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TL;DR: The present review article summarizes the development of iron-, nickel-, and cobalt-catalyzed C-H functionalization reactions until the end of 2016, and discusses the scope and limitations of these transformations.
Abstract: Non-precious-metal-catalyzed reactions are of increasing importance in chemistry due to the outstanding ecological and economic properties of these metals. In the subfield of metal-catalyzed direct C−H functionalization reactions, recent years have shown an increasing number of publications dedicated to this topic. Nickel, cobalt, and last but not least iron, have started to enter a field which was long dominated by precious metals such as palladium, rhodium, ruthenium, and iridium. The present review article summarizes the development of iron-, nickel-, and cobalt-catalyzed C−H functionalization reactions until the end of 2016, and discusses the scope and limitations of these transformations.
169 citations
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169 citations