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

Genomic prediction of complex human traits: relatedness, trait architecture and predictive meta-models

We explore the prediction of individuals' phenotypes for complex traits using genomic data. We compare several widely used prediction models, including Ridge Regression, LASSO and Elastic Nets estimated from cohort data, and polygenic risk scores constructed using published summary statistics from genome-wide association meta-analyses (GWAMA). We evaluate the interplay between relatedness, trait architecture and optimal marker density, by predicting height, body mass index (BMI) and high-density lipoprotein level (HDL) in two data cohorts, originating from Croatia and Scotland. We empirically demonstrate that dense models are better when all genetic effects are small (height and BMI) and target individuals are related to the training samples, while sparse models predict better in unrelated individuals and when some effects have moderate size (HDL). For HDL sparse models achieved good across-cohort prediction, performing similarly to the GWAMA risk score and to models trained within the same cohort, which indicates that, for predicting traits with moderately sized effects, large sample sizes and familial structure become less important, though still potentially useful. Finally, we propose a novel ensemble of whole-genome predictors with GWAMA risk scores and demonstrate that the resulting meta-model achieves higher prediction accuracy than either model on its own. We conclude that although current genomic predictors are not accurate enough for diagnostic purposes, performance can be improved without requiring access to large-scale individual-level data. Our methodologically simple meta-model is a means of performing predictive meta-analysis for optimizing genomic predictions and can be easily extended to incorporate multiple population-level summary statistics or other domain knowledge

26th Annual Computational Neuroscience Meeting (CNS*2017): Part 3 - Meeting Abstracts - Antwerp, Belgium. 15–20 July 2017

This work was produced as part of the activities of FAPESP Research,\ud Disseminations and Innovation Center for Neuromathematics (grant\ud 2013/07699-0, S. Paulo Research Foundation). NLK is supported by a\ud FAPESP postdoctoral fellowship (grant 2016/03855-5). ACR is partially\ud supported by a CNPq fellowship (grant 306251/2014-0)

Hydrothermally synthesized Na2Ti3O7 nanotube-V2O5 heterostructures with improved visible photocatalytic degradation and hydrogen evolution - Its photocorrosion suppression

There is still a need to prepare heterostructure photocatalysts with high activity and recyclability but without using precious metals to reduce the cost of photocatalysts. Thus, a facile and simple method for the synthesis of a Na2Ti3O7 nanotube-V2O5 heterostructure photocatalyst via hydrothermal synthesis is reported herein. The chemical composition, morphology, and structural features of the photocatalyst were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), N-2 adsorption-desorption specific surface area analysis (BET), and diffuse reflectance absorption (DRS) methods. It was observed that the specific surface area of the Na2Ti3O7 nanotube-V2O5 heterostructure photocatalyst increased with the incorporation of V2O5. The Na2Ti3O7 nanotube-V2O5 heterostructure photocatalyst was then used for the removal of rhodamine B (RhB) under simulated solar light irradiation. The Na2Ti3O7 nanotube-V2O5 heterostructure photocatalyst revealed excellent photocatalytic activity and photodegradation kinetics as compared to pristine Na2Ti3O7 nanotubes and V2O5 photocatalysts. Furthermore, both the photoactivity and long-term stability of the Na2Ti3O7 nanotube-V2O5 heterostructure photocatalyst were superior to those of the pristine Na2Ti3O7 nanotubes and V2O5 photocatalysts. The excellent photocatalytic performance of the Na2Ti3O7 nanotube-V2O5 heterostructure photocatalyst can be ascribed to its high specific surface area (283.71 m(2)g(-1)), mesoporous structure, highly dispersed V2O5 nanoparticles, and hindrance of electron-hole pair recombination of Na2Ti3O7 due to the V2O5 incorporation, which is proven by the photoelectrochemical results, including photocurrent and electron impendence spectroscopy results. In addition, during the study of photocatalytic hydrogen evolution, the hydrogen yield of the Na2Ti3O7/V2O5 nanocomposite was 1.83 times that of pristine Na2Ti3O7, which also exhibited excellent photocatalytic activity

Hydrothermally synthesized highly dispersed Na2Ti3O7 nanotubes and their photocatalytic degradation and H-2 evolution activity under UV and simulated solar light irradiation

Photocatalytic water splitting technologies are currently being considered for alternative energy sources. However, the strong demand for a high H-2 production rate will present conflicting requirements of excellent photoactivity and low-cost photocatalysts. The first alternative may be abundant nanostructured titanate-related materials as a photocatalyst. Here, we report highly dispersed Na2Ti3O7 nanotubes synthesized via a facile hydrothermal route for photocatalytic degradation of Rhodamine B (RhB) and the water splitting under UV-visible light irradiation. Compared with commercial TiO2, the nanostructured Na2Ti3O7 demonstrated excellent photodegradation and water splitting performance, thus addressing the need for low-cost photocatalysts. The as-synthesized Na2Ti3O7 nanotubes exhibited desirable photodegradation, and rate of H-2 production was 1,755 mu mol center dot g(-1)center dot h(-1) and 1,130 mu mol center dot g(-1)center dot h(-1) under UV and simulated solar light irradiation, respectively; the resulting as-synthesized Na2Ti3O7 nanotubes are active in UV light than that of visible light response

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

Synthesis, characterization, and optical properties of visible light-driven Bi2S3 nanorod photocatalysts

We report a simple and large-scale one-pot method for the synthesis of Bi2S3 nanorods by using the complexation of Bi(NO3)3??5H2O and Na2S??9H2O precursors. The as-synthesized photocatalyst was characterized by scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, high-resolution X-ray photoelectron spectroscopy, UV-vis spectroscopy, N2 adsorption-desorption isotherms, Fourier transform infrared spectroscopy (FTIR), and thermogravimetric and differential thermal analysis measurements. The photocatalytic performance of the Bi2S3 nanorods was evaluated for the photodegradation of phenol red under visible light irradiation. The orthorhombic Bi2S3 photocatalyst exhibited a 99% photocatalytic efficiency at 100 min under visible light irradiation, which is ascribed to the high specific surface area and crystallinity. The active sites on the Bi2S3 photocatalyst diminished the unwanted recombination of charge carriers within the photocatalyst

ZrO2/MoS2 Heterojunction Photocatalysts for Efficient Photocatalytic Degradation of Methyl Orange

We report a simple solution-chemistry approach for the synthesis of ZrO2/MoS2 hybrid photocatalysts, which contain MoS2 as a cocatalyst. The material is usually obtained by a wet chemical method using ZrO(NO3)(2) or (NH4)(6)Mo7O24 center dot 4H(2)O and C8H6S as precursors. The structural features of obtained materials were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), thermal analysis (TG-DTA), N-2 adsorption-desorption, and photoluminescence (PL). The influence on the photocatalytic activity of the MoS2 cocatalyst concentration with ZrO2 nanoparticles was studied. The MZr-2 hybrid sample had the highest photocatalytic activity for the degradation of methyl orange (MO), which was 8.45 times higher than that of pristine ZrO2 ascribed to high specific surface area and absorbance efficiency. Recycling experiments revealed that the reusability of the MZr-2 hybrid was due to the low photocorrosive effect and good catalytic stability. PL spectra confirmed the electronic interaction between ZrO2 and MoS2. The photoinduced electrons could be easily transferred from CB of ZrO2 to the MoS2 cocatalyst, which facilitate effective charge separation and enhanced the photocatalytic degradation in the UV region. A photocatalytic mechanism is proposed. It is believed that the ZrO2/MoS2 hybrid structure has promise as a photocatalyst with low cost and high efficiency for photoreactions.ope