3/23/2023 0 Comments Core shell nanoparticle synthesis![]() CNTs exhibit a capacity of 2107.5 mAh g −1 after 50 cycles at a current density of 100 mA g −1, with a capacity retention rate of 74.06%. The synergy of Cu and 3D CNTs network also avoids the immediate between the electrolyte and the Si nanoparticles, which is beneficial to maintaining the integrity of the SEI film, thus enhancing the electrochemical performance of the material. Meanwhile, the synergy of the highly conductive metal Cu and 3D CNTs network provides fast migration channels for ions/electrons, which is advantageous for the capacity at high current densities. The coating of Cu and the 3D CNTs network help to slow down the volumetric expansion of Si during the cycle and the exfoliation and pulverization which are caused by volume expansion. In this work, we complement the advantages of Si, metal copper (Cu), and carbon nanotubes (CNTs) to synthesize nanoparticles with core-shell structures encapsulated in a 3D CNTs network ( /CNTs). Among the candidates, silicon (Si) has a high lithium storage capacity as anode material, but its large volume variation and low electron and ion conductivity prevent it from being diffusely used in multiple fields, such as large-scale energy storage systems. NPs can be easily converted to NPs in air at room temperature, which is promising to be used in electronic devices.With the rapid growth of demand for energy storage technology in various industries, it is particularly urgent to develop battery systems with higher energy density. The synthesis approach in this paper is simple and also a promising reference for synthesizing other core-shell NPs. And the shell of Cu2 O is converted to Cu shell. PVP binds onto a different site to proceed with the reduction until all the Cu sources in Cu2 O NPs are completely assumed. FTIR results reveal that Cu+ ions on the surface of Cu2 O nanocrystalline coordinate with N and O atoms in PVP and further are reduced to metallic Cu by excessive ascorbic acid and then form a nucleation site on the surface of Cu2 O nanocrystalline. The extinction peaks could be shifted from 421 nm to 700 nm. Both of these NPs show wide tunable optical properties. The composites, structures, morphologies and extinction properties of and core-shell NPs were systematically characterized by XRD, TEM and extinction spectra. Varying volumes of Ag colloidal solutions were added into the reaction mixtures containing fixed initial concentrations of Cu2+ and PVP, and core-shell NPs with fixed core size but varying outer shell thicknesses could be obtained. It was found that core-shell NPs were easily converted to bimetallic core-shell NPs with the help of surfactant PVP and excessive reducer ascorbic acid in air at room temperature, which is a unique phenomenon. Keyword: core-shell metal-semiconductor nanoparticle conversion core-shell bimetallic nanoparticle PVP tunable optical prop Ībstract: core-shell metal-semiconductor nanoparticles(NPs) were prepared by using solution phase strategy. Journal: Science China Technological Sciences Author(s): YANG AiLing, LI ShunPin, WANG YuJin, WANG LeLe, BAO XiChang, YANG RenQiang, Department of Physics, Ocean University of China, Qingdao Institute of Bioenergy & Bioprocess Technology, Chinese Academy of Sciences ![]()
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