Currently, exploring high‐volumetric‐capacity electrode materials that allow for reversible (de‐)insertion of large‐size K+ ions remains challenging. Tellurium (Te) is a promising alternative electrode for storage of K+ ions due to its high volumetric capacity, confirmed in lithium‐/sodium‐ion batteries, and the intrinsic good electronic conductivity. However, the charge storage capability and mechanism of Te in potassium‐ion batteries (KIBs) have not been unveiled until now. Here, a novel K–Te battery is constructed, and the K+‐ion storage mechanism of Te is revealed to be a two‐electron conversion‐type reaction of 2K + Te ↔ K2Te, resulting in a high theoretical volumetric capacity of 2619 mAh cm−3. Consequently, the rationally fabricated tellurium/porous carbon electrodes deliver an ultrahigh reversible volumetric capacity of 2493.13 mAh cm−3 at 0.5 C (based on Te), a high‐rate capacity of 783.13 mAh cm−3 at 15 C, and superior long‐term cycling stability for 1000 cycles at 5 C. This excellent electrochemical performance proves the feasibility of utilizing Te as a high‐volumetric‐capacity active material for storage of K+ ions and will advance the practical application of KIBs.
title compound are synthesized by a sol-gel method from stoichiometric mixtures of Bi(NO3)3 and Fe(NO3)3 dissolved in 2-methoxyethanol in the presence of citric acid and polyethylene glycol (80°C, 4 d, followed by calcination at 400-700°C for 1-3 h in air). The samples are characterized by XRD, SEM, TEM, UV/VIS spectroscopy, and magnetic measurements. BiFeO3 nanoparticles show efficient photocatalytic activity for methyl orange decomposition under visible light irradiation. In addition, they exhibit weak ferromagnetism at room temperature. -(GAO, F.; CHEN, X.; YIN, K.; DONG, S.; REN, Z.; YUAN, F.; YU, T.; ZOU, Z.; LIU*, J.-M.; Adv.
The rheological behavior of wood fiber/polyethylene composites made of corona treated constituents was investigated. Corona treatment of one or both of the constituents resulted in decreased melt viscosities relative to compounds containing untreated materials. The reduction of melt viscosity may originate from low molecular weight moieties formed on the surfaces of both polyethylene and cellulose during corona treatment. These may act as lubricants at interfaces. Also it was found that the corona treatment of fibers leads to higher packing volumes; this may result from a reduction in fiber length when treated fibers are processed under high shear conditions. As a result these fibers perturb the normal flow pattern in the melt to a lesser degree than the longer fibers of untreated cellulose.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.