Molybdenum disulfide and graphitic carbon nitride (MoS₂-g-C₃N₄) nanocomposites with visible-light induced photocatalytic activity were successfully synthesized by a facile ultrasonic dispersion method. The crystalline structure and morphology of the MoS₂-g-C₃N₄ nanocomposites were characterized by X-ray diffraction (XRD), transmission electron microcopy (TEM), high-resolution TEM (HRTEM) and scanning electron microscopy (SEM). The optical property of the as-prepared nanocomposites was studied by ultraviolet visible diffusion reflection (UV-vis) and photoluminescence(PL) spectrum. It could be observed from the TEM image that the MoS₂ nanosheets and g-C₃N₄ nanoparticles were well combined together. Moreover, the photocatalytic activity of MoS₂-g-C₃N₄ composites was evaluated by the removal of nitric oxide under visible light irradiation (>400nm). The experimental results demonstrated that the nanocomposites with the MoS₂ content of 1.5 wt% exhibited optimal photocatalytic activity and the corresponding removal rate of NO achieved 51.67%, higher than that of pure g-C₃N₄ nanoparticles. A possible photocatalytic mechanism for the MoS₂-g-C₃N₄ nanocomposites with enhanced photocatalytic activity could be ascribed to the hetero-structure of MoS₂ and g-C₃N₄.

The flexible electrochromic supercapacitor electrode exhibits good electrochemical performances (13.6 mF cm⁻², 138.2 F g⁻¹) and high coloration efficiency (80.2 cm² C⁻¹).

Cu₂O is one of the attractive photovoltaic materials for solar cells because of its low cost, nontoxicity, and good mobility. In this paper, an obvious enhancement of power conversion efficiency (PCE) for ZnO/Cu₂O solar cells with perfectly oriented and micrometer grain sized Cu₂O films was experimentally demonstrated. Cu₂O was fabricated using radical oxidation of Cu foils at a low temperature of 500 ^°C. When followed by a rapid quenching and post annealing treatment, the perfectly oriented and micrometer sized Cu₂O crystals (3∼4 μm) could be obtained. The crystal structure and optical properties of Cu₂O were investigated in detail. Compared to conventional solar cells without any treatment, the PCE of the solar cells based on Cu₂O with treatment was 3.18%, corresponding to a significant PCE improvement of 60.6%.

One-step anti-solvent deposition methods are widely applied in inverted perovskite solar cells (PSCs). However, anti-solvent processed films typically exhibit a small grain size and abundant defects. Herein, we propose a facile passivation approach using an ultrathin poly(triarylamine) (PTAA) layer to passivate the interfacial and grain boundary defects. An energy band alignment is realized by introducing an ultrathin PTAA layer sandwiched between the perovskite layer and the poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) layer to suppress interfacial recombination and accelerate hole transfer. By optimum design of the PTAA layer, we fabricate PSCs with a power conversion efficiency (PCE) of 19.04%, a fill factor (FF) of 82.59% and a short-circuit current density (J_sc) of 21.38 mA cm⁻². To the best of our knowledge, the obtained FF value is the maximum among those reported for inverted chlorine-doped methyl perovskite solar cells (PSCs). After storage under ambient conditions for 10 days, the PCE of the PSCs with PTAA modification is still maintained at the 80% level, indicating substantially improved stability. Our work provides an effective method to boost PSCs with enhanced efficiency and stability.