Lauritzenclemensen9178

nt conditions.Li-Se battery is a promising energy storage candidate owing to its high theoretical volumetric capacity and safe operating condition. In this work, for the first time, we report using the whole organic Melamine-based porous polymer networks (MPNs) as a precursor to synthesize a N, O, S co-doped hierarchically porous carbon nanobelts (HPCNBs) for both Li-ion and Li-Se battery. The N, O, S co-doping resulting in the defect-rich HPCNBs provides fast transport channels for electrolyte, electrons and ions, but also effectively relieve volume change. When used for Li-ion battery, it exhibits an advanced lithium storage performance with a capacity of 345 mAh g-1 at 500 mA g-1 after 150 cycles and a superior rate capacity of 281 mAh g-1 even at 2000 mA g-1. Further density function theory calculations reveal that the carbon atoms adjacent to the doping sites are electron-rich and more effective to anchor active species in Li-Se battery. With the hierarchically porous channels and the strong dual physical-chemical confinement for Li2Se, the Se@ HPCNBs composite delivers an ultra-stable cycle performance even at 2 C after 1000 cycles. Our work here suggests that introduce of heteroatoms and defects in graphite-like anodes is an effective way to improve the electrochemical performance.The rapid development of electronic technology generates a great deal of electromagnetic wave (EMW) that is tremendously hazardous to environment and human health. Correspondingly, the high efficient EMW absorption materials with lightweight, high capacity and broad bandwidth are highly required. Herein, a series of three-dimensional (3D) network-like structure formed by silicon coated carbon nanotubes (NW-CNT@SiO2) are massively prepared through an improved sol-gel process. The as-obtained 3D NW-CNT@SiO2 exhibit low densities of about 1.6 ± 0.2 g/cm3. The formation of this special 3D structure can provide high dielectric loss and good impedance matching for EMW absorption. As expected, a minimum reflection loss (RL) of -54.076 dB is obtained when uses the sample prepared by 0.1 g of CNTs and 0.2 mL of tetraethoxysilane as absorbent with a low loading rate of 10 wt% and thin absorber thickness of 1.08 mm. This specific minimum RL value exceeds many other CNT based EMW absorbers reported in previous literature. These findings featured with a green and scalable preparation process provides a facile strategy to design and fabricate high-performance EMW absorption materials, which can be applied to other materials such as carbon fibers and graphene.Spherical carbon materials exhibit great competence as electrode materials for electrochemical energy storage, owing to the high packing density, low surface to volume ratio, and excellent structure stability. How to utilize renewable biomass precursor by green and efficient strategy to fabricate porous carbon microspheres remains a great challenge. Herein, we report a KOH-free and sustainable strategy to fabricate porous carbon microspheres derived from cassava starch with high specific surface area, high yield, and hierarchical structure, in which potassium oxalate monohydrate (K2C2O4·H2O) and calcium chloride (CaCl2) are employed as novel activator. The green CaCl2 activator is crucial to regulate the graphitization degree, specific surface area, and porosity of the carbon microspheres for improving the electrochemical performance. The as-prepared carbon microspheres exhibit high specific surface area (1668 m2 g-1), wide pore size distribution (0.5-60 nm), high carbon content (95%), and exfoliated surface layer. The hierarchical porous carbon microspheres show high specific and areal capacitance (17.1 μF cm-2), superior rate performance, and impressive cycling stability. Moreover, the carbon microspheres based symmetric supercapacitor exhibits high capacitance and excellent cycling performance (100% after 20 000 cycles at a current density of 5 A g-1). This green and novel approach holds great promise to realize low-cost, high-efficient and scalable of renewable cassava starch-derived carbon materials for advanced supercapacitive energy storage applications.

Dispersions of Laponite in water may form gels, the rheological properties of which being possibly tuned by the addition of polymer chains. Laponite-based hydrogels with poly(ethylene oxide) (PEO) were the most widely investigated systems and the PEO chains were then found to reduce the elastic modulus.

Here, hydrogels based on Laponite and poly(2-methyl-2-oxazoline) (POXA) were considered. The adsorption behavior and the local structures within these nanocomposite gels were investigated by small-angle neutron scattering and NMR. The same materials were macroscopically characterized using rheology.

An original evolution of the storage modulus G' with the POXA concentration is evidenced compared to Laponite/PEO hydrogels. At low POXA concentrations, a continuous reduction of G' is observed upon increasing the polymer content, as with PEO, due to the screening of electrostatic interactions between the clay platelets. However, above a critical value of the POXA concentration, G' increases with the polymer counterbalance the effect of electrostatic repulsions and lead to the strengthening of the POXA-based hydrogels.The industrial scale production and application of liquid conductive nanomaterials with well-defined conductive properties, printing adaptability and mechanical properties are crucial for the flexible electronic devices. Although graphene can be used as an attractive liquid nanoink platform for electronic devices, it is still a major challenge to prepare graphene conductive inks with high concentration, conductivity and stability with graphene powders as raw materials and improve the post-treatment process for printed patterns. Here, a novel graphene-based screen printing conductive ink employing liquid-exfoliated graphene powders produced by jet cavitation and carbon black jointly as conductive filler is presented. Tariquidar in vitro The inks with graphene powders containing thicker smaller-area flakes and carbon black fraction of 15% in the total conductive fillers exhibit printability down to lines of 90 μm in width and printed pattern electrical conductivity of 2.15 × 104 S/m at 7 μm thickness along with outstanding mechanical properties.