Method for preparing silicon nanotube by microplasma-assisted molten-salt electrochemistry

Abstract

The disclosure provides a method for preparing silicon nanotubes by microplasma-assisted molten-salt electrochemistry and belongs to the technical field of nano-material preparation, which specifically includes: heating and melting a mixture of anhydrous chloride salt and pre-electrolyzing to deeply remove oxygen impurities; placing solid silicate in molten chloride electrolyte, suspending a microplasma emission electrode above a surface of the solid silicate, and introducing inert gas to excite a cathode; performing electrolysis under a constant current to reduce the solid silicate using high-energy electrons and active particles generated by microplasma so as to form the silicon nanotubes. This method combines the microplasma cathode and solid molten salt electrochemical reduction technology, and realizes direct preparation of silicon nanotubes with high purity, good crystallinity and uniform diameter from solid-state sources without catalysts in a low-oxygen environment, which provides a new material solution for applications such as negative electrodes of lithium-ion batteries.