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Research on the Construction of CdS/Mg⁃CdIn 2S 4 Heterostructures and Their Catalytic Performance in CO 2 Photoreduction
Yan ZHANG, Zhengyi SONG, Liu WAN, Cheng DU, Mingjiang XIE, Jian CHEN
Abstract52)   HTML2)    PDF (3538KB)(0)      

CdS exhibits excellent photochemical properties and high quantum efficiency in the visible light region, however, its catalytic stability is significantly compromised by photocorrosion. Constructing CdS/Mg?CdIn2S4 heterojunctions can effectively suppress photocorrosion and enhance the material's overall stability. In this study, CdS nanowires (CdS NWs), CdS nanoparticles (CdS NPs), and Mg?CdIn2S4 nanosheets (NSs) were prepared using the ion exchange method, and heterojunctions of 5% CdS NWs/Mg?CdIn?S? (5% by mass fraction of CdS NWs) and 5% CdS NPs/Mg?CdIn?S? (5% by mass fraction of CdS NPs) were constructed. The photocatalysts were characterized using X?ray diffraction (XRD), UV?vis diffuse reflectance spectroscopy (DRS), Fourier?transform infrared (FT?IR) spectroscopy, N2 adsorption?desorption isothermal analysis, transient photocurrent measurements, and electrochemical impedance spectroscopy. The results confirmed the successful construction of both CdS NWs/Mg?CdIn2S4 and CdS NPs/Mg?CdIn2S4 heterojunctions. The catalytic performance was evaluated in a photoreaction system, both heterojunctions possess significant capabilities for the photocatalytic reduction of CO2. Notably, the CdS NWs/Mg?CdIn2S4 heterojunction exhibited superior photocatalytic performance, achieving CO and H2 production rates of 716.7 μmol/(g·h) and 664.3 μmol/(g·h), respectively. These values represent a 46.2?fold and 56.8?fold enhancement compared to pristine Mg?CdIn?S?.Consequently, this work provides a solid foundation for further research and practical applications in the field of photocatalytic CO2 reduction, underscoring significant academic and practical significance.

2025, 45 (5): 28-36. DOI: 10.12422/j.issn.1672-6952.2025.05.004
Optimal Design and Analysis of Differential Displacement Three⁃Degree⁃of⁃Freedom Flexible Micro⁃Positioning Platform
Houcheng Du, Yue Wang, Zilong Deng
Abstract862)   HTML12)    PDF (2917KB)(614)      

Based on the differential lever principle, a multi?stage compliant magnifying hinge was designed, and a micro?positioning platform with three translational degrees of freedom was assembled in an orthogonal way, and the symmetrical closed?loop structure formed has the characteristics of shock resistance, no cumulative error and better isotropy. The material is 7075 aluminum, and the stacked piezoelectric ceramics were used as the driving device to provide input displacement. Combined with the path search method and the static matrix method, the static balance equation and geometric deformation equation of the mechanism were obtained; the sensitivity analysis of the structural parameters was carried out, and the parameters with higher sensitivity in the mechanism are optimized with the displacement amplification ratio as the goal; a finite element analysis was performed on the assembly. The results shows that the stroke can reach 391.42 μm and the magnification is 13.05, and the platform has a high displacement magnification ratio and good positioning accuracy.

2022, 42 (6): 66-72. DOI: 10.3969/j.issn.1672-6952.2022.06.011