Crystalline/amorphous nickel sulfide interface for high current density in alkaline HER: surface and volume confinement matters!

In this work, we demonstrate an interface on porous nickel foam (NN) between crystalline nickel sulfide and amorphous nickel sulfide (NNS/NNS) adapting simple hydrothermal and facile electrodeposition processes, respectively. The developed electrocatalyst required a low overpotential of 15 mV to deliver a current density of 10 mA cm and the interface intrinsically activates the electrocatalyst with an onset overpotential comparable to that of Pt in an alkaline hydrogen evolution reaction.

Effect of Ni, Pd, and Pt Nanoparticle Dispersion on Thick Films of TiO Nanotubes for Hydrogen Sensing: TEM and XPS Studies.

Crystal structure, morphological features, and hydrogen-sensing properties of thick film sensors of TiO nanotubes (NTs) impregnated with nanoparticles of elements of Group 10, viz., nickel, palladium, and platinum, having average grain size of about 25, 20, and 20 nm, respectively, are presented. The sensitivity is observed to be higher for Pd/TiO NTs than for Pt/TiO NTs.

Crystal structure determination of two pyridine derivatives: 4-[()-2-(4-meth-oxy-phen-yl)ethen-yl]-1-methyl-pyridin-1-ium hexa-fluoro-λ-phosphane and 4-{()-2-[4-(di-methyl-amino)-phen-yl]ethen-yl}-1-phenyl-1λ-pyridin-1-ylium hexa-fluoro-λ-phosphane.

The title mol-ecular salts, CHNO·PF , (I), and CHN ·PF , (II), are pyridine derivatives. In compound (I), the cation comprises a methyl N-substituted pyridine ring and a meth-oxy-substituted benzene ring connected by a C=C double bond. The F atoms of the PF anion are disordered over two sets of sites with refined occupancy factors of 0.

Comparative Studies on the Aqueous Synthesis and Biocompatibility of L-Cysteine and Mercaptopropionic Acid Capped CdSe/CdS/ZnS Core/Shell/Shell Quantum Dots.

Quantum dots have now become the most important candidates and widely exploited as promising architectures for use as diagnostic and imaging agents in biomedicine and as semiconductors in the electronics industry. This article emphasizes on the aqueous synthesis of water soluble CdSe/CdS/ZnS core/shell/shell quantum dots with L-cysteine and mercaptopropionic acid as capping agent and their observed properties have been compared. The biocompatibility of the assynthesized quantum dots have also been analyzed through the cytotoxicity study using MTT assay.

Crystal structures of two stilbazole derivatives: bis-{()-4-[4-(di-ethyl-amino)-styr-yl]-1-methyl-pyridin-1-ium} tetra-iodido-cadmium(II) and ()-4-[4-(di-ethyl-amino)-styr-yl]-1-methyl-pyridin-1-ium 4-meth-oxy-benzene-sulfonate monohydrate.

The title mol-ecular salts, (CHN)[CdI], (I), and CHN ·CHOS·HO, (II), are stilbazole, or 4-styryl-pyridine, derivatives. The cation, ()-4-[4-(di-ethyl-amino)-styr-yl]-1-methyl-pyridin-1-ium, has a methyl group attached to pyridine ring and a diethyl amine group attached to the benzene ring. The asymmetric unit of salt (I), comprises one cationic mol-ecule and half a CdI dianion.

Investigating the photocatalytic degradation property of Pt, Pd and Ni nanoparticles-loaded TiO nanotubes powder prepared via rapid breakdown anodization.

The present study was performed to investigate the photocatalytic efficiency of the titania (TiO) nanotubes (NTs) powder prepared via rapid breakdown anodization sensitized individually with Ni, Pd and Pt metal nanoparticles (NPs). The TiO NTs powder had the length of 5-6 μm, with the outer diameter between 20 and 25 nm and the wall thickness of 3-4 nm as observed in the scanning and transmission electron microscopes. The crystal structure analysis employing X-ray diffraction indicated the presence of Pt, Pd and Ni NPs in face-centered cubic phase over the anatase TiO NTs powder.

Bulk size crystal growth, spectroscopic, dielectric and surface studies of 4-N,N-dimethylamino-4-N'-methylstilbazolium m-nitrobenzenesulfonate (DSMNS): A potential THz crystal of stilbazolium family.

The synthesis and growth of a potentially useful and efficient nonlinear optical organic single crystal of 4-N,N-dimethylamino-4-N'-methylstilbazolium m-nitrobenzenesulfonate (DSMNS) is reported. The growth experiment involved the slope nucleation method coupled with slow cooling as well as slow solvent evaporation techniques. Single crystal X-ray diffraction (XRD), Fourier transform infrared (FT-IR), FT-Raman and nuclear magnetic resonance (NMR) techniques have been employed to ascertain the structure and composition of the crystal.

Crystal structure of bis-(thio-cyanato-κS)bis-(thio-urea-κS)mercury(II).

In the title complex, [Hg(NCS)2(CH4N2S)2], the Hg(II) atom is four-coordinated having an irregular four-coordinate geometry composed of four thione S atoms of two thio-cyanate groups and two thio-urea groups. The S-Hg-S angles are 172.02 (9)° for the trans-thio-cyanate S atoms and 90.

Linear and nonlinear optical, mechanical, electrical and surface studies of a novel nonlinear optical crystal - manganese mercury thiocyanate (MMTC).

The highly efficient nonlinear optical single crystal of manganese mercury thiocyanate has been grown from slow evaporation solvent technique. The second harmonic generation and optical transmittance of the grown crystal are studied by Kurtz and Perry powder technique and spectroscopic absorbance spectrum. Mechanical behaviour is analyzed using Vickers microhardness test.

4-Methyl-anilinium 4-hy-droxy-benzene-sulfonate.

In the crystal of the title molecular salt, C7H10N(+)·C6H5O4S(-), the benzene-sulfonate units are linked through phenol-sulfonate O-H⋯O hydrogen bonds, forming chains along the c-axis direction. These chains are linked via N-H⋯O hydrogen bonds involving two of the three H atoms of the ammonium group of the 4-methyl-anilium cation, giving rise to two-dimensional networks parallel to the bc plane which are further connected through an additional N-H⋯O inter-action in which the third ammonium H atom is involved, generating a three-dimensional network.

Growth and physicochemical properties of L-phenylalaninium maleate: a novel nonlinear optical crystal.

Single crystals of novel organic nonlinear optical material, L-phenylalaninium maleate (LPM) having dimensions up to 10 × 6 × 6 mm(3) were grown by slow evaporation solution growth technique at room temperature. The grown crystals were confirmed by single crystal X-ray diffraction studies and the various functional groups were identified by FT-IR spectroscopic analysis. The optical properties were studied by optical absorption, second harmonic generation (SHG), photoconductivity and photoluminescence (PL) studies and reported for the first time.

Synthesis, growth and characterization of new borate-mixed crystals of type (NH4)1-xKxB5O8.

New borate-mixed crystals of type (NH4)1-x KxB5O8 were grown from aqueous solution by slow solvent evaporation method. The mixed crystals were confirmed by atomic absorption studies (AAS) and characterized by X-ray diffractometry (XRD), Fourier transform infrared (FT-IR), Fourier transform Raman (FT-Raman), optical absorption and solubility studies. The second harmonic generation efficiencies of the parent and mixed crystals were studied and compared with that of KDP.