Device and method for preparing electrode of vertical graphene double electric layer capacitor at constant voltage

Abstract

The invention discloses a device and a method which are used for preparing an electrode of a vertical graphene double electric layer capacitor at the constant voltage. The device comprises a quartz tube, a heating furnace, a flow collector, a needle-like electrode, a high voltage negative power supply, an inert gas inlet, a hydrogen inlet, a bubble bottle and a carbon source gas inlet. The flow collector and the needle-like electrode are placed inside the quartz tube, the needle-like electrode is externally connected with the high voltage negative power supply and the needle tip of the needle-like electrode is opposite to the flow collector. The flow collector is grounded. The quartz tube is placed in the heating furnace. One end of the quartz tube is opened while the other end of the quartz tube is provided with the inert gas inlet, the hydrogen inlet, and the carbon source gas inlet, wherein the carbon source gas inlet is connected with the quartz tube through the bubble bottle. With the adoption of constant voltage glow normal discharge plasma-enhanced chemical vapor deposition method, a vertical-oriented graphene nanopiece grows directly on the surface of the flow collector, so that the electrode of the double electric layer supercapacitor, which uses the vertical-oriented graphene as an active material, is directly obtained without a bonder.

Description

technical field

[0001] The invention belongs to the technical field of energy storage materials, and relates to a device and a method for preparing vertically oriented graphene electric double layer supercapacitor electrodes under normal pressure. Background technique

[0002] A supercapacitor is an electrochemical energy storage device between traditional capacitors and secondary batteries, mainly including electric double layer capacitors and Faraday quasi-capacitors (also known as pseudocapacitors). The principle of electric double layer capacitance is the interface electric double layer theory proposed by German physicist Helmholtz in 1853, that is, the electrostatic capacitance is generated through the charge separation process on the interface between the active material and the electrolyte for energy storage. Compared with Faraday quasi-capacitors, electric double-layer capacitors have no chemical reaction on the electrode and electrolyte surface, and have faster char...

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