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Flexible hygroelectric generators (HEGs) that derive affordable and sustainable electricity power from omnipresent moisture are promising candidates for smart textile electronics. However, the desired compatibility of high output current and continuous operating voltage is still challenging for wearable HEGs to meet the ever-increasing nanotechnological requirements. Herein, we rationally design and finely synthesize conductive carbonized silk fabrics with in situ growth of SnO/SnO 2 nanosheet arrays, which are successfully employed to fabricate high-efficiency wearable HEGs with a maximal power density of 26.66 μW·cm−2 by sandwiching with MXene/cotton fabrics and Al electrodes. Impressively, the vertically interlaced SnO/SnO 2 nanosheet arrays supply abundant nanofluidic channels for rapid water diffusive flow with a high flow potential. Combined with the excellent moisture absorption and retention of MXene/cotton textiles, these prepared HEGs process sustained voltage and current outputs of 0.932 V and 0.434 mA over 20,000 s. These flexible HEGs are capable of application in self-powered sensors and micro power supplies, delivering a fresh strategy for the rational design of high-performance and sustainable textile-based electronics. [Display omitted] • A hygroelectric generator based on nanofluidic channels toward was developed. • The vertically interlaced SnO/SnO 2 nanosheet arrays supply abundant nanofluidic channels for a high flow potential. • The asymmetric fabrics structure incudes a proton concentration gradient for the enables charge separation. • These textile-based HEGs demonstrate an excellent performance with a maximal power density of 26.66 μW·cm−2. [ABSTRACT FROM AUTHOR]

Abstract: The Cd TiO2 nanorods were synthesized by the vapor transport method of water molecules, and urea was used as the carbon and nitrogen source. The samples were characterized by X-ray diffraction and photoelectron spectroscopy analysis. The scanning electron microscope images showed that as-prepared TiO2 powders were nanorods, which were formed by the stacking of nanoparticles with a uniform size around 40nm. The degradation of methylene blue with the prepared nanorods demonstrated the photocatalytic activities of TiO2 under visible light are improved by doping with C and N elements. The main reasons were discussed: doping with C and N elements could enhance the corresponding visible-light absorption of TiO2. On the other hand, doping C and N could create more oxygen vacancies in the TiO2 crystals, which could capture the photogenerated electrons more effectively. Thus, more photogenerated holes could be left to improve the photocatalytic activity of TiO2. [Copyright &y& Elsevier]

• Urchin-liked nanoparticles were prepared by microwave-induced hydrolysis process. • Urchin-liked nanoparticles made up of CuO/Cu(OH) 2 substructure nanowires. • Urchin-liked nanoparticles present the porous structure with BET of 230.67 m2/g. • Maximum adsorption capacity for Cr(Ⅵ) on Cu-based nanoparticles is 357.25 mg/g. • The Cr(VI) adsorption was an endothermic and spontaneous process. The hierarchical CuO/Cu(OH) 2 urchin-like nanoparticles with branching nanowires were rationally constructed under the ultrasonic hydrolysis treatment based on the Cu-based hollow spheres by microwave treatment. Moreover, due to the novel hierarchical nanostructure with a high specific surface area (230.67 m2/g) and a porous structure (the average pore volume was 0.96 cm3/g), hierarchical CuO/Cu(OH) 2 urchin-like nanoparticles demonstrated an outstanding adsorbent properties for Cr(VI). The maximal adsorption proportion was 95.4% at 100 mg/L initial Cr(VI) concentrations, the maximum adsorption capacity at 298 K and pH 4.0 was 425.49 mg/g. [Display omitted] Hierarchical self-assembly nanomaterials with high spatial/angular precision have attracted intensive attention in the urgent research focus in industrial and environmental fields, such as the efficient removal of heavy metal ions from aqueous solution. Herein, we developed an facile microwave-induced ultrasonic hydrolysis approach for the fine synthesis of the hierarchical CuO/Cu(OH) 2 urchin-like nanoparticles, which is comprised by Cu-based substructure nanowires with an average diameter of ~5 nm. Benefiting from the high specific surface area of 230.67 m2/g, the urchin-like CuO/Cu(OH) 2 hierarchical nanoparticles demonstrated a high maximum adsorption capacity of 357.25 mg/g at pH = 6.0 and T = 298 K for Cr(VI). Furthermore, the corresponding removed approximately 95% can be achieved after the adsorption process for 30 min, suggesting the fast adsorption for Cr(VI). Thermodynamic and kinetic investigations revealed that the Cr(VI) adsorption on the urchin-like CuO/Cu(OH) 2 hierarchical nanoparticles was an endothermic and spontaneous process, which could be well fitted by the pseudo-second-order kinetic model. This approach provides new prospects for curbing heavy metal pollution in the environment based on the hierarchical self-assembly nanomaterials. [ABSTRACT FROM AUTHOR]

Abstract: AgI doped SnO2 nano-composites were prepared by the chemical coprecipitation method and were characterized by the X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Results showed that main of the I− ions remained in the AgI lattice which is highly dispersed in the system. The photo-catalytic experiments performed under visible light irradiation using methylene blue as the pollutant revealed that not only the photo-catalytic activity but also the stability of SnO2 based photocatalyst could be improved by introduction of an appropriate amount of AgI, and the result was further supported by the UV–Vis diffuse reflection spectra and the electron spin-resonance spectra. Among all of the samples, AgI–SnO2 nano-composite with 2At% AgI exhibited the best catalytic efficiency and stability. [Copyright &y& Elsevier]