Tiny MoO3 nanocrystals self-assembled on folded molybdenum disulfide nanosheets via a hydrothermal method for supercapacitor

Coupling of two active semiconductors can easily lead to a deterioration of their intrinsic properties. In this work, tiny MoO3 nanocrystals were deposited on 3D MoS2 frameworks via a hydrothermal reaction, with heterostructures forming by oxygen-bonding interactions at their interface. When tested as a supercapacitor electrode, the MoS2/MoO3 heterostructure exhibited a high specific capacitance of 287.7 F g(-1) at a current density of 1 A g(-1), and a remarkable cycling stability after 1000 cycles at 1 A g(-1) in an aqueous solution compared to pristine MoS2. The results thus reveal the superior properties of the MoS2/MoO3 heterostructure for supercapacitor electrode

Rare earth metal Gd influenced defect sites in N doped TiO2: Defect mediated improved charge transfer for enhanced photocatalytic hydrogen production

In this experimental studies, we report the synthesis of TiO2 co-doped by both cationic and anionic sites by simple sol-gel based method. All the prepared samples exhibit the anatase crystalline morphology however, showed lattice distortion caused by the displacement of Ti4+ sites by Gd3+. The improved visible absorption is witnessed by the Gd and N co-doping with an assured redshift in the absorption edge. The N and Gd displacement inside TiO2 lattice accompanied by the creation of O-Ti-N and Gd-O-Ti bonds are characterized by the X-ray photoelectron spectra. The strong resonance signal by Gd4f electrons in the electron paramagnetic resonance spectroscopy further substantiate the displacement of lattice cites of TiO2 by Gd3+ ions. The longevity of the photo produced charges observed in fluorescence spectra of Gd and N co-doped TiO2 is because of the effective transfer of charges to the defect sites. The aforementioned catalysts are tested for their capacity for the H-2 production from water splitting. The 2 wt% gadolinium and nitrogen co-doped TiO2 has shown 10764 mu mol g(-1) H-2 production which is 26 times higher than the commercial Degussa P-25 catalyst. The enhanced activity for hydrogen production can be attributed to factors such as increased absorptivity under visible light and effective charge carrier separation

Single-step hydrothermal synthesis of wrinkled graphene wrapped TiO2 nanotubes for photocatalytic hydrogen production and supercapacitor applications

Herein, we discuss the synthesis of reduced graphene oxide and TiO2 (rGO-TiO2) nanocomposites with varying ratios of rGO to TiO2 by hydrothermal method. Photocatalytic ability of the nanocomposites was assessed for H2 production under natural sunlight. At 5 wt% GO loading, the rGO-TiO2 exhibited 24,880 ??mol/g/h H2, 12.9 times to commercial P25-TiO2 (1920 ??mol/g/h). The symmetric supercapacitor device fabricated using rGO-TiO2 demonstrated 160 F/g specific capacitance with 99% retention. The efficient charge carrier separation and transportation between TiO2 nanotubes and rGO resulted high photocatalytic activity. The synergistic double layer pseudo capacitor behavior of rGO-TiO2 is the reason for improved specific capacitance

Synthesis of 2-Methylpyrazine Using Crude Glycerol over Zn-Cr-O Catalyst: A Value Addition Process for the Utilization of Biodiesel By-Product

Mixed oxides of ZnO and Cr2O3 with varied mole ratios were synthesized, characterized, and evaluated for the dehydrocyclization of crude glycerol for the production of 2-methylpyrazine (2-MP). The Zn-Cr-O composition was optimized using the bulk and surface properties of the catalysts rationalized by BET-SA, XRD, XPS, H2-TPR, O2 pulse chemisorption, and Raman spectroscopic techniques to achieve a high rate of 2-MP

Bismuth oxide cocatalyst and copper oxide sensitizer in Cu2O/TiO2/Bi2O3 ternary photocatalyst for efficient hydrogen production under solar light irradiation

A novel Cu2O/TiO2/Bi2O3 ternary nanocomposite was prepared, in which copper oxide improves the visible light absorption of Ti0(2) and bismuth oxide improves electron-hole separation. The ternary composite exhibited extended absorption in the visible region, as determined by UV-Vis diffuse reflectance spectroscopy. Highresolution transmission electron microscopy images showed close contact among the individual semiconductor oxides in the ternary Cu2O/TiO2/Bi2O3 nanocomposite. Improved charge carrier separation and transport were observed in the Cu2O/TiO2/Bi2O3 ternary composite using electrochemical impedance spectroscopy and photocurrent analysis. TiO2 modified with bismuth and copper oxides showed exceptional photocatalytic activity for hydrogen production under natural solar light. With optimum bismuth and copper oxide loadings, the Cu2O/ TiO2/Bi2O3 ternary nanocomposite exhibited an H-2 production (3678 mu mol/h) 35 times higher than that of bare TiO2 (105 mu mol/h). The synergistic effect of improved visible absorption and minimal recombination was responsible for the enhanced performance of the as-synthesized ternary nanocomposite

Tiny MoO₃ nanocrystals self-assembled on folded molybdenum disulfide nanosheets via a hydrothermal method for supercapacitor

<p>Coupling of two active semiconductors can easily lead to a deterioration of their intrinsic properties. In this work, tiny MoO₃ nanocrystals were deposited on 3D MoS₂ frameworks via a hydrothermal reaction, with heterostructures forming by oxygen-bonding interactions at their interface. When tested as a supercapacitor electrode, the MoS₂/MoO₃ heterostructure exhibited a high specific capacitance of 287.7 F g⁻¹ at a current density of 1 A g⁻¹, and a remarkable cycling stability after 1000 cycles at 1 A g⁻¹ in an aqueous solution compared to pristine MoS₂. The results thus reveal the superior properties of the MoS₂/MoO₃ heterostructure for supercapacitor electrode.</p> <p>We successfully synthesized tiny MoO₃ nanocrystals deposited on 3D MoS₂ frameworks via a self-assembly. The MoS₂/MoO₃ heterostructure exhibited a high specific capacitance and cycling stability compared to pristine MoS₂.</p