Method for preparing Nano graphite sol by inputting pulsed dc bias to dual graphite electrodes

Abstract

This invention discloses a method for preparing graphite nanosol by pulse DC bias current with double graphite electrodes. The method comprises: placing two parallel graphite plates into an electrolytic tank filled with electrolyte aqueous solution, connecting to the anode and cathode of a pulse DC bias power source respectively, and applying pulse DC bias current (square wave, pulse frequency 20-50 Hz, pulse amplitude 8-12 V, bias voltage 2-5 V, bias current density 0.5-3 mA / cm2) to obtain graphite nanosol with particle sizes of 10-30 nm. The obtained graphite nanosol has such advantages as high dispersibility, high stability, low energy consumption and is suitable for mass production. The graphite nanosol has wide applications.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for preparing nanometer graphite sol by electrolysis. Background technique [0002] When carbon is in the nanoscale range, it exhibits many properties that conventionally sized carbon materials do not have. Nano-carbon materials are widely used, such as battery electrode materials, magnetic recording materials, electric heating materials, etc. In addition, nano-carbon materials also play an important role in agriculture, aerospace and other fields. Carbon is an element in a semi-metallic state. At the nanoscale, it has strong selective adsorption and is negatively charged. It is easy to agglomerate and difficult to disperse, making the preparation of nano-carbon very difficult. [0003] JP7008790 reports a preparation method of using a carbon material electrode as an anode, immersing the electrode in a water electrolyte, and conducting electrolysis with dire...

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Problems solved by technology

Because the productive rate and energy density of graphite sol are closely related, although the method unit instantaneous energy density of the graphite sol of CN1579932A described method improves to some extent than DC power supply method, thereby makes productive rate improve to some extent than CN1378975A, but because its total average time The energy density is then lower than that of the DC power supply method, so the method described in CN1579932A still has a large room for improvement