A method for preparing in situ oxygen-doped three-dimensional graphene by electrochemical exfoliation

Abstract

The invention discloses a method for preparing in-situ oxygen-doped three-dimensional graphene through electrochemical exfoliation, comprising: after the graphite sheet is pretreated, subjected to liquid nitrogen freezing and physical expansion treatment to obtain an expanded graphite sheet; the expanded graphite sheet is passed through The electrochemical stripping method is transformed into an in-situ oxygen-doped three-dimensional graphene material; the electrolytic solution for electrostripping is an oxidizing acid electrolyte. The preparation process route of the method is short, the required equipment is simple, the raw material price is low, and the preparation cycle is short; the in-situ oxygen-doped three-dimensional graphene provided by the preparation method of the present invention can be directly grown on the surface of the graphene material, which is not a powder material and can be directly It is used as an electrode material without secondary electrode preparation; and in an acidic electrolyte, its anode overpotential is as low as 268mV, which has both high-efficiency catalytic activity and good stability. The preparation of in-situ oxygen-doped three-dimensional graphene materials also has obvious cost advantages and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of electrochemical materials, in particular to a method for preparing in-situ oxygen-doped three-dimensional graphene by electrochemical exfoliation. Background technique [0002] Water splitting to produce hydrogen and oxygen is recognized as the most potential energy conversion technology and an important means to solve the energy crisis and environmental pollution. Compared with other energy conversion technologies such as fossil fuel hydrogen production and wind energy hydrogen production, electrocatalytic water splitting hydrogen production has the characteristics of cleanness, continuity and high efficiency. However, the low energy conversion efficiency limits the development of its application. The root cause is that the anode material has a high overpotential. [0003] At present, the water splitting hydrogen production reaction is more efficient in acidic environment, but the acidic environment is not conduc...

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Problems solved by technology

Other oxygen-doped graphene preparation technologies, including plasma method, high-temperature calcination method and electrolysis method (CN107601488A, CN107311165A), have problems such as low oxygen doping content, complex equipment, high production cost, etc., and it is difficult to realize industrialization

[0005] In addition, most of the oxygen-doped graphene materials reported so far are powder materials, which need to be prepared twice to become electrodes. The process is complicated, and the introduced binder material will reduce the conductivity and inhibit its catalytic performance.

[0006] How to overcome the problems of long preparation cycle, high cost and low oxygen doping amount in the existing oxygen-doped graphene technology has become an urgent problem in the industry

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