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We report on the synthesis of pristine and Cu-doped SnO 2 spheres using a facile hydrothermal method and investigate their microstructures and gas-sensing response. We focus on how Cu doping can have an impact on gas-sensing behavior of SnO 2 -based sensors toward H 2 S. We find that Cu doping can enhance significantly the gas response of SnO 2 toward H 2 S, the origin of which can be clarified with a proposed adsorption model. First-principles calculations reveal that adsorption energy of H 2 S on Cu-doped surface is lower than that on undoped one and the interaction between adsorbed H 2 S and Cu-doped surface is stronger than that between adsorbed H 2 S and pure surface, which consequently improves gas-sensing performances of SnO 2 toward H 2 S. Such a combined experimental and calculational study offers an explanation on how Cu doping affects gas-sensing performances of SnO 2 . [ABSTRACT FROM AUTHOR]

The selection of electrode materials and the optimization of electrode configurations are two effective approaches to achieve high-performance energy storage. As a representative ternary metal oxide, CoMoO 4 has been directly grown on the carbon cloth via a facile hydrothermal method and subsequent calcination, forming a binder-free electrode. Further measurements reveal that this electrode is composed of CoMoO 4 nanosheets assembled 3D-framworks (NAFs) and thereby shows a superb electrochemical property in KOH solution. It is worth mentioning that the specific capacitance reaches as high as 1234 F/g at the current density of 1 A/g, which exceeds most of CoMoO 4 and CoMoO 4 -based composites reported so far. Meanwhile, when the current density increases to 10 A/g, a considerable specific capacitance of 446 F/g is still obtained and can maintain nearly unchanged after 5000 cycles. [ABSTRACT FROM AUTHOR]

In this paper, we present the synthesis of novel three-dimensional SnO 2 /MoS 2 nanocomposites via electrospinning combined with a hydrothermal method and their application to CH 4 gas detection. Morphological characterization proved that the flower-like MoS 2 structures were successfully connected to the surface of porous SnO 2 nanofibers. The CH 4 gas-sensing test results indicated that the gas-sensing properties of SnO 2 /MoS 2 nanocomposites were better than those of pure MoS 2 ; the SnO 2 /MoS 2 nanocomposites exhibited lower optimal operation temperature and higher gas response. Such excellent performance is mainly attributable to the special hierarchical structure and the existence of n–n junctions between SnO 2 and MoS 2. [ABSTRACT FROM AUTHOR]

Ternary metal oxides have great potential for chemical storage devices because of their outstanding synergistic effects as well as rich redox reactions. However, there are limited reports of 3D structure BiCoO 3 materials and relevant electrochemical properties. Meanwhile, the study of BiCoO 3 is reasonably important for underlying metal oxides researches. In this work, we have successfully developed a 3D urchin-like BiCoO 3 material without using any template and surfactant. For the supercapacitor application, the BiCoO 3 material showed a specific capacitance of 152 F g −1 at the current density of 1 A g −1 , and this value exhibited a rate capability of 82.3% at a high current density of 10 A g −1 . Furthermore, the sample showed the ideal cycling stability (92.7% retention after 5000 times cycles at the current density of 1 A g −1 and nearly invariable specific capacitance during different current density cycles). These results suggest that the obtained urchin-like BiCoO 3 sample has superb electrochemical performances which suggest its promising applications as renewable and clean energy storage devices electrode materials in the future. [ABSTRACT FROM AUTHOR]