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

Abstract

The method for preparing nano-graphite sol by passing a pulsed DC bias current through double graphite electrodes disclosed by the present invention is to put two graphite plates side by side in parallel into an electrolytic cell equipped with an aqueous electrolyte solution, and connect the positive and negative pulsed DC bias power supplies respectively. Negative electrode, at room temperature, apply a pulsed DC bias current with a square wave waveform, a pulse frequency of 20-50Hz, a pulse amplitude of 8-12V, a bias voltage of 2-5V, and a bias current density of 0.5-3mA / cm2 , to obtain a graphite sol with a graphite particle size of 10-30 nm. The nano-graphite sol obtained by the invention has good dispersibility and stability, saves energy, has low production cost, and is suitable for large-scale industrial production. The prepared nano-graphite sol has a wide range of applications.

Description

technical field [0001] The invention relates to a method for preparing nanomaterials, in particular to a method for preparing nanographite sol by electrolysis. Background technique [0002] At the nanoscale, carbon exhibits properties that many conventional-sized carbon materials do not possess. Nano-carbon is 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 very easy to agglomerate and is difficult to disperse, which makes the preparation of nanocarbon very difficult. [0003] JP7008790 reports a carbon material electrode as an anode, and the electrode is immersed in a water electrolyte, and electrolyzed with direct current to obtain a preparation method for the deposition o...

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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