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, a series of mesoporous Fe-MCM-41, Co-Co MCM41 and Ni-MCMCM41 catalysts with different quantity of the metal incorporated in the framework were synthesized and characterized (as-synthesized samples and those after reaction) by X-ray diffraction pattern (XRD), N2 adsorption-desorption, transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) techniques.
158 citations
TL;DR: In this article, 3D ternary nickel iron sulfide microflowers with a hierarchically porous structure directly grown on Ni foam via a convenient two-step method have been fabricated, and further used as an efficient electrocatalyst for both the HER and the OER.
Abstract: The development of low-cost, highly efficient, and stable electrocatalysts toward overall water splitting (both the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER)) is essential for future energy supply. In this report, 3D ternary nickel iron sulfide microflowers with a hierarchically porous structure directly grown on Ni foam via a convenient two-step method have been fabricated, and further used as an efficient electrocatalyst for both the HER and the OER. Thanks to the unique 3D morphology and strong electron interactions between Fe, Ni and S, the as-synthesized Ni0.7Fe0.3S2 delivers an overpotential of 198 mV at a current density of 10 mA cm−2 toward the OER in alkaline media, which is, to the best of our knowledge, the best among the reported non-noble metal based electrocatalysts. Furthermore, when used as both the anode and cathode, a low cell voltage of 1.625 V is needed to obtain 10 mA cm−2 for the overall water splitting.
158 citations
TL;DR: In this paper, it is suggested that both hydrogen trapping at grain boundaries and short-circuit diffusion through grain boundaries in nickel are present, and the trap binding energy at grain boundary is estimated as 20.5 kJ ⋅ mol-1.
Abstract: Hydrogen thermal analysis experiments have been employed to study the trapping and transport phenomena of hydrogen in nickel. Dislocations in nickel act as trapping sites of hydrogen, and the hydrogen trap activation energy at dislocations appears to be lower than the activation energy for the bulk diffusion of hydrogen. It is suggested that both hydrogen trapping at grain boundaries and short-circuit diffusion through grain boundaries in nickel are present. The trap binding energy at grain boundaries is estimated as 20.5 kJ ⋅ mol-1. Using the hydrogen thermal analysis experiments, the solubility and diffusivity of hydrogen in nickel have been measured. The temperature dependences of those are described by C (H atoms/Ni atom) = 1.57 × 10-3 exp(-11.76 kJ ⋅ mol-1/RT) and D (m2 s-1) = 7.5 × 10-7 exp(-39.1 kJ ⋅ mol-1/RT), respectively.
158 citations
TL;DR: In this article, the Spray Pyrolysis Technique (SPT) has been used for spray deposition of NiO thin film and its characterization methods for various applications such as optoelectronic applications.
Abstract: This study reviews NiO film deposition using the Spray Pyrolysis Technique (SPT). Physical and chemical methods can be used to deposit NiO film. This review looks at different precursors and their characterization methods for spray deposition of NiO thin film. The usefulness of SPT emanates from this method being simple, low cost, and viable for mass production. It gives high product purity for metallic and non-metallic material deposition. Nickel chloride, nickel acetate, nickel nitrate, nickel hydroxide, nickel sulfate, and nickel formate are the major precursors for NiO thin film deposition. Nickel chloride and nickel acetate are the most used and highly available precursors. Unlike nickel acetate, nickel chloride precursors corrode the deposition equipment (spray gun). These precursors are relatively cheap compared to current materials used for solar panels (cells). SPT equipment consumes negligible power during deposition and none after usage. Various authors have investigated the physical, chemical, optical, structural characterization and properties of nanostructured NiO thin film. NiO films are p-type semiconductors and as such possesses direct band gap suitable for various applications. The film has been categorized as an excellent material for optoelectronic applications because of its tune-ability for optimization. The wide band gap is in the range of 3.25–4.0 eV. This review will be useful to researchers exploring solar photovoltaic potentials for solving electricity problems of developing countries.
158 citations
TL;DR: In this article, the catalytic dimerization of propene to hexenes isomers by nickel complexes is described. But they do not specify the solvents used for this process.
Abstract: Organochloroaluminate molten salts based on aluminium trichloride or ethylaluminium dichloride and 1-methyl-3-butylimidazolium chloride, 1-butylpyridinium chloride or tetrabutylphosphonium chloride can be used as solvents for the catalytic dimerization of propene to hexenes isomers by nickel complexes.
158 citations