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Abstract: Two pyrazolate-bridged dinuclear Pd(II) diimine complexes {[(phen)Pd]2L2}(NO3)2 (1) and {[(bpy)Pd]2L2}(NO3)2 (2) have been synthesized through metal–metal interaction and spontaneous deprotonation from 1H-3,5-diphenylpyrazole (HL) in aqueous solution. These complexes show Pd(II)⋯Pd(II) interactions and anion binding have been characterized by elemental analyses, 1H and 13C NMR, ESI-MS, UV–Vis and luminescent spectroscopy, and single crystal X-ray diffraction methods. [Copyright &y& Elsevier]

[Display omitted] • ZnO/TiO 2 heterojunction was constructed, effectively separating photo-generated carriers. • ZnO should be electrodeposited by CV on high crystallinity TiO 2 nanorods that have been calcined. • Depositing ZnO facilitates rapid electron transfer. • Introducing oxygen-rich vacancy ZnO effectively enhances the photocatalytic performance of TiO 2 photoanode. This study presents a novel approach utilizing a simple, stable, reproducible CV (Cyclic Voltammetry) electrodeposition method to deposit varying amounts of ZnO onto ordered TiO 2 (Rutile) nanorod arrays. Comprehensive investigations were conducted on the morphology, semiconductor band-gap structure of different ZnO/Rutile composites, and their performance in photocatalytic (PC) and photoelectrochemical (PEC) hydrogen production. Results demonstrate that the ZnO/TiO 2 photoanodes fabricated in this manner exhibit outstanding PC/PEC hydrogen production capabilities. Particularly noteworthy is the Z/R-15 photoanode, showcasing superior PEC performance with a photocurrent density 3.5 times higher than that of the pristine TiO 2 photoanode under equivalent conditions. Furthermore, it was observed that depositing ZnO onto highly crystalline, annealed TiO 2 nanorods yields optimal photoelectrical properties. Incorporating oxygen-rich vacancies in ZnO significantly enhances the photoelectrocatalytic performance of TiO 2 photoanodes. The CV electrodeposition method offers valuable insights for developing efficient photocatalytic hydrogen production catalysts. [ABSTRACT FROM AUTHOR]

Abstract: A novel graphene oxide sheets/polyaniline/CdSe quantum dots (GO/PANi/CdSe) nanocomposites were successfully synthesized and used for the sensitive electrochemiluminescence (ECL) biosensing. The GO/PANi/CdSe nanocomposites were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), ultraviolet–visible (UV–vis) absorption spectroscopy, photoluminescence (PL) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. Finally, the nanocomposites were employed to construct the biosensor via layer-by-layer assembly for the ECL detection of Cytochrome C (Cyt C). The whole process was characterized by cyclic voltammogram (CV) and electrochemical impedance spectroscopy (EIS). Experimental parameters such as the ratio of GO/PANi, the K2S4O8 concentration and the pH value of electrolyte solution were studied to investigate the effect on the ECL intensity. Under the optimized conditions, the ECL intensity decreased linearly with the Cyt C concentrations in the range from 5.0×10−8 to 1.0×10−4 M with detection limit of 2.0×10−8 M. Besides, the as-proposed biosensor exhibits high specificity, good reproducibility, and stability, and may be applied in more bioanalytical systems. [Copyright &y& Elsevier]