Quality Factor Improvement of a Thin-Film Piezoelectric-on-Silicon Resonator Using a Radial Alternating Material Phononic Crystal.

This paper studies the radial alternating material phononic crystal (RAM-PnC). By simulating the band gap structure of the phononic crystal, a complete acoustic band gap was verified at the resonant frequency of 175.14 MHz, which can prevent the propagation of elastic waves in a specific direction.

The high photocatalytic efficiency and stability of LaNiO/g-CN heterojunction nanocomposites for photocatalytic water splitting to hydrogen.

A binary direct Z-scheme LaNiO/g-CN nanocomposite photocatalyst consisted with LaNiO nanoparticles and g-CN nanosheets was successfully synthesized by means of mechanical mixing and solvothermal methods in order to improve the photocatalytic water splitting activity. The as-prepared materials were characterized by powder X-ray diffraction (XRD), Scanning Electron microscope (SEM), Transmission Electron microscope (TEM), X-ray photoelectron spectroscope (XPS), Fourier Transform Infrared Spectroscopy (FT-IR) and N adsorption-desorption experiments, respectively, demonstrating the formation of interfacial interaction and heterogeneous structure in LaNiO/g-CN nanocomposites. Under UV-light irradiation, the LaNiO/g-CN samples which without the addition of any noble metal as co-catalyst behaved enhanced photocatalytic water splitting activity compared with pure LaNiO and g-CN, owing to the Z-scheme charge carrier transfer pathway.

Z-Scheme LaCoO/g-CN for Efficient Full-Spectrum Light-Simulated Solar Photocatalytic Hydrogen Generation.

Photocatalytic decomposition of water is the most attractive method for the sustainable production of hydrogen, but the development of a highly active and low-cost catalyst remains a major challenge. Here, we report the preparation of LaCoO/g-CN nanosheets and the utilization of LaCoO instead of noble metals to improve the photocatalytic activity for the production of hydrogen. First, LaCoO was successfully prepared by the sol-gel method, and then a series of highly efficient Z-scheme LaCoO/g-CN heterojunction photocatalysts were synthesized by the solvothermal method.