[en] According to the target chamber structure and shooting mode of SG-Ⅲ laser facility, a static X-ray imaging system (SXI) has been successfully developed based on the principle of pin-hole imaging. This system uses the imitated target for off-line targeting, and can be adjusted on-line, with the regulation accuracy of 81 μm and 40 μm. The pinhole component and filter component can be changed automatically, which realizes fast online aiming and running in vacuum environment. The displacement and stress were calculated using the software ANSYS to ensure the reliability of this system. Laser targeting evaluation of the system equipped with X-ray CCD has been conducted on SG-Ⅲ laser facility. The result shows that the system reaches the requirement of the SG-Ⅲ laser facility. (authors)

[en] One-dimensional Bi₂Mo_xW_1-xO₆ (x = 0, 0.2, 0.5, 0.67, and 1) photocatalysts have been successfully synthesized for the first time by a straightforward electrospinning technique with a calcination process. The as-formed Bi₂Mo_xW_1-xO₆ nanofibers are composed of inter-linked nanosheets of 30–50 nm in size and characterized by thermogravimetric and differential scanning calorimetric, Fourier transform infrared, Raman spectra, X-ray powder diffraction, scanning electron microscope, Brunauer-Emmett-Teller, transmission electron microscope, UV-Vis spectroscopy, photoluminescence, HPLC, and EIS. The photodegradation behaviors towards organic dyes, including rhodamine B (RhB) and methylene blue (MB) are investigated, and the results illustrate that Bi₂Mo_0.25W_0.75O₆ nanofibers exhibit the highest photocatalytic performance under visible light irradiation than Bi₂Mo_xW_1-xO₆ (x = 0, 0.2, 0.5, 0.67, and 1) samples. The possible mechanisms of the enhanced photocatalytic properties are discussed in detail.

[en] The platform which is used to carry diagnostic instruments on Shenguang facility requires high positioning accuracy and working stability, and can aim at the target with reliability. A double optical path automatic adjusting and aiming system is designed, its position accuracy is 20 μm. It employs a double optical image system and a 3-DOF motion components. In this system, visual servo technology is used to realize the automatic aiming. Automatic positioning test indicates that pointing accuracy is 11 μm in x direction, 12 μm in y direction and radical positioning accuracy is 14 μm. Laser shot test with X-ray framing camera shows that the automatic aiming system can satisfy the projects requirement. (authors)

[en] With doping a bit of phosphorus (P) into the lattice of FeVO₄ nanobelts, FeP_xV_1 − xO₄ solid solution nanobelts have been successfully synthesized for the first time via a simple electrospinning process. The as-prepared products were characterized by thermogravimetric and differential scanning calorimetry (TG-DSC), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis absorbance spectroscopy, and electrochemical impedance spectra (EIS). The results demonstrated that the lattice constants of FeVO₄ were changed and transport of charge carriers was improved after doping P element. Furthermore, the FeP_0.005V_0.995O₄ nanobelts presented an admirable one-dimensional morphology and the excellent photocatalytic properties for the degradation of methylene blue (MB) solution under the visible light irradiation. .

[en] Highlights: • An unique core–shell structure of CoTiO₃@NiO was prepared. • A direct Z-scheme photocatalytic mechanism was presented. • The CoTiO₃@NiO composite posseses superior photocatalytic performance. The hierarchical binary 1D@2D CoTiO₃@NiO Z-scheme heterojunctions with well-defined core–shell feature display the enhanced photocatalytic activity for antibiotic tetracycline decomposition under visible light illumination. The obtained CoTiO₃@NiO heterostructured sub-microbelts show a superior photocatalytic efficiency to the pristine CoTiO₃ sub-microbelts, and NiO nanoclusters. The TC removal efficiency of CoTiO₃@NiO sub-microbelts is 1.75 and 2.15 times higher than that of pristine CoTiO₃, and NiO, respectively. The electrospinning CoTiO₃ sub-microbelts are decorated uniformly with in situ nanosheets of NiO longitudinally aligned through a facile two-step precipitation-calcination processure. The Z-scheme heterojunctions consisting of CoTiO₃ and NiO efficiently accelerate photo-generated electron-hole separation efficiency, and afford a high specific surface area, which ultimately improve the efficiency of TC degradation. The profitable carrier transmission mechanism and special core–shell structure in the CoTiO₃@NiO system are in charge of the elevated catalytic activity because of the formed Z-scheme system. These features demonstrate that the hierarchical CoTiO₃@NiO core–shell heterojunctions have the great application potential for tetracycline removal from wastewater.

[en] The Shenguang III facility general diagnostic instrument manipulator provides a diagnostic platform to insert or retract various diagnostic systems into and out of the target chamber. It provides precision radial positioning and pointing capability, and it can carry diagnostic systems to specific position. It can also ensure the installation, debugging and maintaining of diagnostic system without affecting the vacuum in the target chamber. Installed on the Shenguang III prototype facility, it provides the radial positioning accuracy of 36 μm, and the pointing precision of 13 μm in X direction and 8 μm in Y direction. Full path positioning repeatability is 20 μm in radial direction, 30 μm in X direction and 12 μm in Y direction. Laser shot testing with X-ray framing camera indicates that, pointing accuracies in X and Y directions, radial positioning accuracy, vacuum capability,interface all meet the requirements of physical experiments. The manipulator also has the immunity to electromagnetic interference and radiation. (authors)

[en] Electrocatalytic O-2 conversion and water-splitting hold great promise to enable the chemicals-electricity inter-transition in many renewable-energy initiatives. Enhancing the kinetics of the oxygen reduction reaction (ORR) is challenging. Here, we present that Zn₃(VO₄)₂/Ni(OH)₂/rGO (reduced graphene oxide) nanosheet arrays-a Zn-3(VO₄)₂/Ni(OH)₂ composite in the form of nanometer-thick nanosheets on an rGO substrate-serve as an efficient and stable electrocatalyst for the ORR in alkaline electrolytes. The thin-sheet structure and smaller free energy of Zn-3(VO₄)₂/Ni(OH)₂, as well as the excellent conductivity of the rGO substrate, enable a large electrochemically-active surface area and a high electron transport, contributing to the superior electrocatalytic oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). Furthermore, Zn-3(VO₄)₂/Ni(OH)₂/rGO and Zn-3(VO₄)₂/Ni(OH)₂ samples exhibit remarkable long-term water-splitting stability of 48 h. Density functional theory (DFT) calculations reveal the optimized intermediate affinity ability at the Ni(OH)₂ side, due to electrons transferring from Ni(OH)₂ to Zn-3(VO₄)₂. Additionally, the higher hybridization degree of density of states (DOS) boosts electron transfer in the electrocatalytic process. More broadly, this work provides new inspiration for the construction of a novel noble metal-free electrocatalyst that could show great promise in energy electrocatalysis. (authors)

[en] One-dimensional (1D) α-Fe_2O_3/Bi_2MoO_6 heterostructures have been prepared by the electrospinning in combination with the calcination process. The length of α-Fe_2O_3/Bi_2MoO_6 heterostructures calcined at 500 °C for 2 h was up to several millimeters, and the diameter was approximately 100–150 nm. The as-prepared samples were characterized by thermogravimetric and differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV–vis diffuse reflectance spectrum (UV–vis DRS). The photocatalytic degradation tests reveal that the obtained α-Fe_2O_3/Bi_2MoO_6 heterostructures exhibit the higher degradation rate of methylene blue (MB) than the pure Bi_2MoO_6 nanofibers and TiO_2 (Degussa P25) under the simulated sunlight irradiation. The construction of α-Fe_2O_3/Bi_2MoO_6 heterostructures can effectively impede the recombination of photoelectrons and holes and the possible photocatalytic mechanism has also been discussed in details. - Graphical abstract: The gel nanofibers show the well defined 1D nanostructure with the random distribution. And the appearance of the surface of the as-prepared nanofibers is smooth and homogeneous. 1D nanostructures still preserve except for a lot of spherical particles existed in the fibers calcined at 500 °C for 2 h. In addition, the construction of α-Fe_2O_3/Bi_2MoO_6 heterojunctions is be beneficial to hinder the recombination of photo-induced electron/hole, and thus improves the photocatalytic efficiency under the simulated sunlight irradiation. - Highlights: • One-dimensional α-Fe_2O_3/Bi_2MoO_6 heterostructures were prepared by electrospinning process. • The ratio of Bi to Fe ascertained by XPS is basically identical to the original data. • α-Fe_2O_3/Bi_2MoO_6 heterostructures show superior photocatalytic activity. • The possible photocatalytic mechanism has also been discussed in details