MOFs derivative Co-Ni-B-P composite material and preparation method and application thereof

Abstract

The invention discloses an MOFs derivative Co-Ni-B-P composite material which is prepared by the following steps of: firstly, preparing Co-Ni-MOF by adopting a solvothermal method to form a flower cluster spherical primary structure; and carrying out boronizing treatment and phosphating treatment by adopting a chemical oxidation-reduction method to respectively form a nanosheet secondary structure and a nanoparticle tertiary structure. The effects of high porosity, material structure protection, material oxygen vacancy increase, specific surface area increase and ion transmission rate increase are achieved, and the effects of rapid Faraday reaction and conductivity improvement and pseudocapacitance providing are further achieved. The preparation method of the Co-Ni-MOF material comprises the following steps of: (1) preparation of a Co-Ni-MOF material; (2) boronizing treatment; and (3) phosphating treatment. The Co-Ni-MOF material is charged and discharged in the range of-0.1 V to 0.45 V when applied as a supercapacitor electrode material. When the discharging current density is 1 A/g, the specific capacitance is 1500 F/g to 1600 F/g. The Co-Ni-MOF material has the excellent material stability performance and the excellent ion transmission capacity.

Description

technical field [0001] The invention relates to the technical field of supercapacitors, in particular to the preparation of a MOFs derivative Co-Ni-B-P composite material and its application in the field of supercapacitors. Background technique [0002] With the rapid development of energy-based electronic devices such as portable electronic devices, backup power systems, electric vehicles, etc., energy storage devices have emerged as important secondary energy sources and are essential in all aspects of our daily lives. Among various energy storage devices, supercapacitors are currently at the forefront of this research. As one of the representative modern energy storage devices, supercapacitors have been widely studied due to their unique properties such as high power density, long cycle life, fast charging capability, and safe operation mode. [0003] It is well known that the performance of supercapacitors largely depends on the electrode materials. To date, different ...

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Problems solved by technology

[0009] Therefore, when introducing bimetallic MOFs as composite electrode materials, the technical problem that must be solved is the low utilization rate of the metal active sites between the bimetallic components and the inability to exert the unique Faraday capacitance characteristics of the metal components.

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