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Preparation method and application of high-performance cobalt-based oxygen evolution electrocatalytic nano material

A nanomaterial, electrocatalytic technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve problems such as large specific surface area, achieve high catalytic activity, promote electron transfer, and accelerate electron transfer rate.

Pending Publication Date: 2021-04-16
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It remains a challenge to synthesize nanomaterial catalysts with uniform shape and large specific surface area, thereby exposing a large number of catalytic active sites.

Method used

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  • Preparation method and application of high-performance cobalt-based oxygen evolution electrocatalytic nano material
  • Preparation method and application of high-performance cobalt-based oxygen evolution electrocatalytic nano material
  • Preparation method and application of high-performance cobalt-based oxygen evolution electrocatalytic nano material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1, cobalt-based oxygen evolution electrocatalyst product 1 (Co 2 (OH) 3 Cl) Preparation

[0051] 1.5mmol of CoCl 2 ·6H 2 O and 1.5mmol of cetyltrimethylammonium bromide (CTAB) were added to a mixed solution of 6ml of deionized water and 30ml of methanol, ultrasonicated for 15min to obtain a clear solution, and transferred to a high-pressure reaction of 50ml of polytetrafluoroethylene in the cauldron. Take a 1cm×1cm pretreated nickel foam and immerse it, and react at 180°C for 24h. The foamed nickel material obtained by the reaction was repeatedly rinsed with deionized water, and finally dried in a vacuum oven at 60°C for 2 hours to obtain a lamellar product supported by foamed nickel with a structure of Co 2 (OH) 3 Cl.

Embodiment 2

[0052] Example 2, cobalt-based oxygen evolution electrocatalyst product 2 (CoMOF-NH 2 ) preparation

[0053] Get 0.5mmol o-aminoterephthalic acid (BDC-NH 2 ) into a 15ml polytetrafluoroethylene autoclave, and add 8ml of DMF and 1ml of deionized water in the mixed solvent, ultrasonic 15min to obtain a clear solution, the foam nickel prepared above was loaded with Co 2 (OH) 3 The Cl material was immersed in the above solution, the reaction tube was sealed, and the ligand conversion reaction was carried out at 100°C for 24h. The layered MOF structure material supported on the surface of nickel foam obtained by this solvothermal treatment was washed several times with deionized water, and finally dried in an oven at 60 °C for 6 hours. The product was labeled as CoMOF-NH 2 .

Embodiment 3

[0054] Embodiment 3, cobalt-based oxygen evolution electrocatalyst (Co 3 o 4 / NC) preparation

[0055] CoMOF-NH with layered MOF structure 2 Controlled heat treatment was performed under an argon atmosphere. The specific process is as follows: under an argon atmosphere (argon gas flow rate 80ml / min), first heat from room temperature to 600°C at a rate of 5° / min, keep at 600°C for 6 hours, and finally cool to room temperature at a rate of -5°C / min, get co 3 o 4 / NC.

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Abstract

The preparation method comprises the following steps: taking foamed nickel with high conductivity as a substrate, firstly, growing a precursor material with a layered arrangement structure of Co2 (OH) 3Cl on the foamed nickel through a solvothermal method; then adding o-aminoterephthalic acid and the like as ligands, and carrying out ligand conversion reaction through a solvothermal method to synthesize the metal organic framework (MOF) nanosheet CoMOFNH2 with an ultrathin structure; and finally, carrying out controllable heat treatment in an inert atmosphere at a high temperature to obtain the porous nanosheet Co3O4 / NC with efficient OER catalytic performance. In 1M KOH electrolysis, Co3O4 / NC only needs overpotentials of 235mV and 264mV to reach current densities of 10mA / cm < 2 > and 100mA / cm < 2 >, the Tafel slope is only 80mV / dec, and the performance is still kept stable after long-time use.

Description

technical field [0001] The invention relates to the fields of new material technology and electrocatalysis, and belongs to the field of nanometer materials. Specifically, it relates to a cobalt-based oxygen evolution electrocatalytic nanomaterial and a synthesis method thereof, and its synthesized cobalt-based oxygen evolution electrocatalyst (Co 3 o 4 / NC) has a novel structure and excellent electrochemical performance. Background technique [0002] The increasing energy crisis and associated environmental concerns such as the over-combustion of fossil fuels have led to extensive research on clean and sustainable alternative energy sources. Recently, the electrolysis of water has emerged as one of the most promising approaches to achieve efficient energy conversion and storage in chemical forms. As a half-reaction of water electrolysis, the oxygen evolution reaction (OER) involves multiple electron transfer processes and is associated with various renewable energy system...

Claims

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Application Information

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IPC IPC(8): C25B11/091C25B11/031C25B1/04
CPCY02E60/36
Inventor 阳卫军李欢欢谭明洋
Owner HUNAN UNIV
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