We report a procedure to fabricate nanostructured Ni films via programmed electrochemical deposition from a choline-chloride-based ionic liquid at a high temperature of 90 °C. Three electrodeposition modes using constant voltage, pulse voltage, and reverse pulse voltage produce a variety of nanostructured Ni films with micro/nanobinary surface architectures, such as nanosheets, aligned nanostrips, and hierarchical flowers. The nanostructured Ni films possess face-centered cubic crystal structure. Amazingly, it is found that the electrodeposited Ni films deliver the superhydrophobic surfaces without any further modifications by low surface-energy materials, which might be attributed to the vigorous micro/nanobinary architectures and the surface chemical composition. The electrochemical measurements reveal that the superhydrophobic Ni film exhibit an obvious passivation phenomenon, which could provide enhanced corrosion resistance for the substrate in the aqueous solutions.

One-Step Fabrication of Nanostructured Ni Film with Lotus Effect from Deep Eutectic Solvent

https://pure.tue.nl/ws/files/81000019/Particle_Size_and_Crystal_Phase_Effects_in_Fischer_Tropsch_Catalysts.pdf

Particle Size and Crystal Phase Effects in Fischer-Tropsch Catalysts

Exploring the dependence of the structure–activity relationship of catalysts is important for improving the activity and selectivity in heterogeneous catalysis. Among other factors, the influence of the crystal phases, face-centered cubic (FCC) and hexagonal close-packed (HCP), of Ni catalysts on CO dissociation is studied by density functional theory (DFT). Surface energies of numerous FCC and HCP facets are calculated to construct the corresponding morphologies, and the exposed facets (six facets for FCC Ni and five facets for HCP Ni) are used to investigate the CO dissociation. For FCC Ni, (311) is the most active facet with the least barrier of 1.58 eV, followed by (100) and (211) with barriers of 1.63 and 1.75 eV, respectively. For HCP Ni, (1012) is the most active facet with the least barrier of 1.73 eV, followed by (1011) with a barrier of 1.86 eV. On both FCC and HCP Ni, CO dissociation shows a dramatic structural sensitivity irrespective of direct or H-assisted pathway. Compared to the direct d...

CO Dissociation on Face-Centered Cubic and Hexagonal Close-Packed Nickel Catalysts: A First-Principles Study

Cellulose nanocrystals were prepared using ionic liquids (ILs), 1-ethyl-3-methylimidazolium chloride [EMIM][Cl] and 1-propyl-3-methylimidazolium chloride [PMIM][Cl], from microcrystalline cellulose. The resultant samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The XRD results showed that nanocellulose obtained by treatment with both ILs preserved basic cellulose I structure, but crystallinity index of samples (except for Sigmacell treated with [EMIM][Cl]) was lower in comparison to the starting microcrystalline cellulose. The DLS results indicated noticeably smaller particle sizes of prepared cellulose for material treated with [PMIM][Cl] compared to cellulose samples hydrolyzed with [EMIM][Cl], which were prone to agglomeration. The obtained nanocellulose had a rod-like structure that was confirmed by electron microscopy analyses. Moreover, the results described in this paper indicate that cation type of ILs influences particle size and morphology of cellulose after treatment with ionic liquids.

Preparation of Nanocellulose Using Ionic Liquids: 1-Propyl-3-Methylimidazolium Chloride and 1-Ethyl-3-Methylimidazolium Chloride.

Incorporation of iridium into electrodeposited rhenium-nickel alloys

Electrochemical synthesis of hexagonal closed pack nickel: A hydrogen storage material

Spectroscopic studies of the ionic liquid during the electrodeposition of Al–Ti alloy in 1-ethyl-3-methylimidazolium chloride melt

A 3-d planar Solid Oxide Fuel Cell (SOFC) model has been developed to simulate the effect of 'change in constitutive materials of anode' on the overall performance of the fuel cell. The model couples electrochemical kinetics with multi-dimensional gas dynamics and multi-component transport of species. The present model is made in commercially-available computational fluid dynamics (CFD) software, Fluent and able to predict conventional I-V curves (polarization curve) in addition to details of internal processes, such as flow field distribution, species concentrations, potential and current distributions throughout the cell. The simulation sets are performed with and without the interfacial resistance effect in case study_l. Optimized cell without interfacial resistance shows increase in oxygen and hydrogen utilization respectively from 23.28% to 75.8% and 39.69% to 98.83%. On the other hand, the series ran with interfacial resistance shows decrease in the air and fuel utilization with the increase in interfacial resistance. Case study_2 dealt with the effect of the materials on the overall performance of the cell. Modeling in this part is made by taking the ionic part as the limiting condition for the electrical conductivity in the matrix. The MAT (i.e. the novel anode) showed better overall efficiency in the cell than that of Ni-YSZ anode under similar conditions.

Computational Modeling of a Planar 3-D SOFC and the Effect of Materials Properties On the Anode Performance

Development of Anode Materials for Solid Oxide Fuel Cells -A Review

Nickel was electrodeposited from NiCl2-1-ethyl-3-methylimidazolium chloride at various temperatures at a constant potential. It was observed that by varying the electrolysis temperature, face centered cubic (FCC) and hexagonal close packed structured (HCP) nickel could be produced. From spectroscopic studies, it could be said that H+ ions played an important role in the formation of HCP nickel. The hydrogen content in HCP nickel was found to be 1.2 wt%. From the Chronoamperometric studies, the diffusion coefficient of the electroactive species for the electrodeposition of nickel at 150 °C was estimated to be 1.1 × 10−5 cm2 s−1.

Synthesis of face centered cubic and hexagonal closed packed nickel using ionic liquids

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