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This paper describes two different processes to synthesize vertically aligned hematite nanorod and nanotube arrays, respectively, on a conductive substrate by the electrochemical deposition method with the help of an anodized aluminum oxide nanotemplate. The two types of nanostructured hematite were used as the photoanode for photoelectrochemical cells. The hematite nanotubes exhibited much higher photoelectrochemical activity than the hematite nanorods, including an improved photocurrent density, more negative onset potential, better photon harvesting, and better charge carrier transfer ability. The observed behavior may offer new information to enhance the photocatalytic ability of hematite, which is considered to be one of the best photoanode materials in the research field of photoelectrochemical cells.

The determination of solubility of acetamiprid dissolved in thirteen pure solvents such as isobutanol, methanol, ethanol, n-butanol, isopropanol, acetone, ethylene glycol, 1-methyl-2-pyrrolidinone, ethyl acetate, dimethyl sulfoxide (DMSO), 1,4-dioxane, N,N-dimethylformamide, and water and binary liquid mixtures (ethanol + water) was carried out using the shake-flask method at the temperatures from 278.15 to 318.15 K under local atmospheric pressure of 101.2 kPa. The observed values of mole fraction solubility were the highest in DMSO and the lowest in water. A linear solvation energy relationship analysis was carried out to reveal how much and what type of intermolecular solvent−solvent and solute−solvent interactions were responsible for the solubility variation in these thirteen pure solvents. The results exhibited that the solubility of acetamiprid in these thirteen monosolvents depends significantly upon the Hildebrand parameter and nonspecific dipolarity/polarizability interactions of the solvents. The experimental solubility data in pure solvents were correlated through the Apelblat equation, while those in liquid mixtures through the Apelblat−Jouyban−Acree model, the van't Hoff−Jouyban−Acree model, and the Jouyban−Acree model. For the selected pure solvents, the largest values of relative average deviation and root-mean-square deviation were, respectively, 1.77% and 36.21 × 10 −4 and for the mixtures were 5.15% and 4.81 × 10 −4 , respectively. In the ethanol + water mixtures, the log x 12 values positively deviated from the average ones of log x 12 , which showed that the acetamiprid was preferentially solvated by ethanol.

Highly ordered and vertically grown Pt-doped α-Fe(2)O(3) nanorod arrays on a gold substrate were successfully prepared by the electrochemical co-deposition method using an anodized aluminum oxide template. The effect of the Pt doping in α-Fe(2)O(3) nanorod arrays on their water splitting ability was investigated for the first time. The elemental maps obtained by energy dispersive spectroscopy showed that the Pt was uniformly dispersed in the α-Fe(2)O(3) nanorod arrays. The photoelectrochemical properties of the α-Fe(2)O(3)/Pt composite nanorod arrays as a function of the Pt content were studied by measuring their photocurrent-potential behavior in 1 M NaOH electrolyte under AM 1.5 100 mW cm(-2) illumination. The Pt-doped α-Fe(2)O(3) nanorod arrays show an improvement in solar-to-hydrogen conversion efficiency (∼5%) for photoelectrochemical water splitting compared to undoped samples. To the best of our knowledge, it is the highest value yet obtained from α-Fe(2)O(3).

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