Oxygen Vacancies Enable Excellent Electrochemical Kinetics of Carbon Coated Mesoporous SnO2 Nanoparticles in Lithium Ion Battery

Herein, we report the synthesis, characterization and electrochemical performance of carbon coated mesoporous SnO2 nanoparticles (NPs) prepared by adopting a simple hydrothermal process. BET analysis shows that the SnO2 formed...

ZnO Nano-Flowers Assembled on Carbon Fiber Textile for High-Performance Supercapacitor’s Electrode

Herein, a crystalline nano-flowers structured zinc oxide (ZnO) was directly grown on carbon fiber textile (CFT) substrate via a simple hydrothermal process and fabricated with a binder-free electrode (denoted as ZnO@CFT) for supercapacitor (SC) utilization. The ZnO@CFT electrode revealed a 201 F·g−1 specific capacitance at 1 A·g−1 with admirable stability of >90% maintained after 3000 cycles at 10 A·g−1. These impressive findings are responsible for the exceedingly open channels for well-organized and efficient diffusion of effective electrolytic conduction via ZnO and CFT. Consequently, accurate and consistent structural and morphological manufacturing engineering is well regarded when increasing electrode materials’ effective surface area and intrinsic electrical conduction capability. The crystalline structure of ZnO nano-flowers could pave the way for low-cost supercapacitors.

The Production of Carbon Nanofiber on Rubber Fruit Shell-Derived Activated Carbon by Chemical Activation and Hydrothermal Process with Low Temperature

Recently, the conversion of biomass into carbon nanofibers has been extensively studied. In this study, carbon nanofibers (CNFs) were prepared from rubber fruit shell (RFS) by chemical activation with H3PO4, followed by a simple hydrothermal process at low temperature and without a vacuum and gas catalyst. XRD and Raman studies show that the structure formed is an amorphous graphite formation. From the thermal analysis, it is shown that CNFs have a high thermal stability. Furthermore, an SEM/TEM analysis showed that CNFs’ morphology varied in size and thickness. The obtained results reveal that by converting RFS into an amorphous carbon through chemical activation and hydrothermal processes, RFS is considered a potential biomass source material to produce carbon nanofibers.

Cabbage-Like NiCo2S4/MoS2 Assemblies as Electrode Materials for Asymmetric Hybrid Capacitors

In this work, cabbage-like NiCo2S4/MoS2 assemblies are prepared via a simple hydrothermal process. The as-prepared product as electrode material possesses a specific capacitance of 612 C g−1 at 1 A g−1 and 94% capacitance retention after 10000 cycles at 10 A g−1. Furthermore, the as-assembled asymmetric supercapacitor exhibits an energy density of 73.3 Wh kg−1 at a power density of 453.4 W kg−1. It demonstrates that the cabbage-like structures present promising applications in future energy storage devices.

Effect of Growth Time on the Structural and Morphological Properties of MoS2 Synthesized via Hydrothermal Method

Recently, molybdenum disulfide (MoS2), have been explored as photothermal materials for solar evaporation. However, the optimum phase for photothermal material, 1T-MoS2 or 2H-MoS2, is still debatable. In this work, we observed the morphological and structural properties of MoS2 prepared by a simple hydrothermal process at 200 °C in three different growth times (16, 20, and 24 hours) using Na2MoO4·2H2O (sodium molybdate) as a Mo precursor, and CS(NH2)2 (thiourea) as S precursor. MoS2 nanoflowers were successfully prepared with nanosheets petals and its diameter increased from 0.4 to 2.8 and 4.5 as the growth time increased from 16 to 20 and 24 hours. The increase in growth time also led to improve the Mo:S ratio from 1:8 to 1:5 and facilitate the phase transformation from 1T to 2H as indicated by the shifting of (002) diffraction peak from 9.25° to higher degrees (12.98°, and 14.12°).

Efficient Photocatalytic Degradation of RhB by Constructing Sn3O4 Nanoflakes on Sulfur-Doped NaTaO3 Nanocubes

Band structure engineering and heterojunction photocatalyst construction are efficient approaches to improve the separation of photo-induced electrons and holes, along with enhancing light response ability. By sulfur doping, sodium tantalite (NaTaO3) showed an improved photocatalytic property for the degradation of Rhodamine B (RhB). Sn3O4 nanoflakes were constructed on the surface of NaTaO3 nanocubes, forming a surface heterostructure via a simple hydrothermal process, initially. This heterostructure endows the photocatalyst with an enhanced charge separation rate, resulting in an improved photocatalytic degradation of RhB. Moreover, a possible mechanism over Sn3O4/NaTaO3 and the photodegradation pathway of RhB were proposed as the combined effect of photo-induced electrons and holes. This facile process for band structure engineering and heterostructure construction provides the possibility for the practical application of high-efficiency photocatalysts.

Novel construction of carbon nanofiber/CuCrO2 composite for selective determination of 4-nitrophenol in environmental samples and for supercapacitor application

A simple hydrothermal process has been used to prepare a carbon nanofiber/copper chromium dioxide (CNF/CuCrO2) composite for the selective detection of 4-nitrophenol (4-NP) and supercapacitor applications.

High-rate asymmetrical supercapacitors based on cobalt-doped birnessite nanotubes and Mn-FeOOH nanotubes

Herein, we firstly prepared Co-doped birnessite and Mn-FeOOH nanotubes by a simple hydrothermal process using a sacrificed template method. The doping ratio was adjusted by setting the molar ratios of Co and Mn in the preparing process. Both the Co-doped birnessite and Mn-FeOOH nanotubes exhibit ideal electrochemical properties, especially their excellent rate capability.

Facile Construction of Sandwich-like TiO2-ZnO-ED-HPV Composite for Photodegradation of Ciprofloxacin

The TiO2-ZnO, TiO2-ZnO-ED and TiO2-ZnO-ED-HPV (TZEDHPV) nanocomposite were successfully prepared by simple hydrothermal process The nanocomposite was characterized and conformed by DRS-UV, FT-IR, XRD, SED and EDX analsis. The DRS-UV analysis of TZEDHPV nanocomposite absorption was increased with the band gap decrease of TiO2-ZnO by the addition of heteropoly acid (HPV). The FT-IR spectra of photocatalyst, presents the characteristic bands of metal oxide, ED and HPV. SEM and EDX analysis reveals clustered microsponge-like structure of catalyst with more number of cavities. Photodegradation of ciprofloxacin (CF conc.: 40 µM), exhibited 98.20 % removal efficiency under UV light. According to the scavenger method results, O2•- radical played a main role in the photocatalytic degradation.