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Preparation and application of MOF-guided nickel-cobalt bimetallic phosphide

A bimetallic and phosphide technology, applied in chemical/physical processes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as high Tafel slope and large overpotential, and achieve excellent electrocatalytic performance and The effect of stability

Active Publication Date: 2020-05-08
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still two major disadvantages of single metal phosphides during electrochemical operation, one is the large overpotential and the other is the high Tafel slope

Method used

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  • Preparation and application of MOF-guided nickel-cobalt bimetallic phosphide
  • Preparation and application of MOF-guided nickel-cobalt bimetallic phosphide
  • Preparation and application of MOF-guided nickel-cobalt bimetallic phosphide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Dissolve 0.75 mmol BDC in a mixed solution of 32 mL DMF, 2 mL ethanol and 2 mL deionized water at room temperature. After ultrasonication for 1 h and magnetic stirring for 0.5 h, 0.75 mmol NiCl 2 •6H 2 O and 0.75 mmol CoCl 2 •6H 2 O was added to the above mixed solution, then 0.8 mL of ETA was rapidly injected, the solution was magnetically stirred for 5 min to form a uniform suspension, and further sonicated continuously for 8 h under sealed conditions, and finally washed with DMF and ethanol alternately 3 times and collected by centrifugation. Ni1Co1-BDC was obtained by vacuum drying at 60℃;

[0027] (2) Combine 50mg Ni1Co1-BDC and 250mg NaH 2 PO 2 •H 2 O is placed in two positions of the porcelain boat, Ni1Co1-BDC is placed upstream of the porcelain boat, NaH 2 PO 2 •H 2 O was placed downstream of the porcelain boat, and then the porcelain boat was put into a tube furnace, calcined in an Ar atmosphere, and kept at 300 °C for 2 h. After the calcination is ...

Embodiment 2

[0030] (1) Same as Example 1;

[0031] (2) Combine 50mg Ni1Co1-BDC and 250mg NaH 2 PO 2 •H 2 O is placed in two positions of the porcelain boat, Ni1Co1-BDC is placed upstream of the porcelain boat, NaH 2 PO 2 •H 2 O was placed downstream of the porcelain boat, and then the porcelain boat was placed in a tube furnace, calcined in an Ar atmosphere, and kept at 280 °C for 2.5 h. After the calcination is completed, the temperature is cooled to room temperature, washed three times with deionized water, collected by centrifugation, and dried under vacuum at 60 °C to obtain Ni1Co1-P;

[0032] (3) Electrochemical performance test of Ni1Co1-P / NF: at a current density of 40 mA / cm 2 Overpotential is 274mV, Tafel is 80mV dec -1 .

Embodiment 3

[0034] (1) Same as Example 1;

[0035] (2) Combine 50mg Ni1Co1-BDC and 250mg NaH 2 PO 2 •H 2 O is placed in two positions of the porcelain boat, Ni1Co1-BDC is placed upstream of the porcelain boat, NaH 2 PO 2 •H 2 O was placed downstream of the porcelain boat, and then the porcelain boat was placed in a tube furnace, calcined in an Ar atmosphere, and kept at 320 °C for 1.5 h. After the calcination is completed, the temperature is cooled to room temperature, washed three times with deionized water, collected by centrifugation, and dried under vacuum at 60 °C to obtain Ni1Co1-P;

[0036] (3) Electrochemical performance test of Ni1Co1-P / NF: at a current density of 40 mA / cm 2 Overpotential is 284mV, Tafel is 85mV dec -1 .

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Abstract

The invention discloses a preparation method of a MOF-guided nickel-cobalt bimetallic phosphide. The preparation method comprises the steps: fully dissolving 1,4-terephthalic acid in a mixed solutionof ethanol, deionized water and DMF, adding NiCl2.6H2O and CoCl2.6H2O, adding ethanolamine, magnetically stirring, and carrying out ultrasonic dispersion, washing and vacuum drying under sealed conditions to obtain a nickel-cobalt bimetallic material marked as Ni1Co1-BDC; in an Ar atmosphere, calcining Ni1Co1-BDC and NaH2PO2.H2O at the temperature of 280-320 DEG C for 1-2 h, cooling to room temperature, washing, and carrying out vacuum drying to obtain the nickel-cobalt bimetallic phosphide marked as Ni1Co1-P. Ni1Co1-P is used as an electrocatalyst for water electrolysis oxygen evolution reaction, and Ni1Co1-P shows excellent electrocatalytic performance and stability in the oxygen evolution reaction process due to a unique layered porous structure, an ultrathin carbon film and the synergistic effect of high-activity nickel and cobalt.

Description

technical field [0001] The invention belongs to the technical field of synthesis and application of catalysts, and relates to the preparation of a nickel-cobalt double-metal phosphide, in particular to the preparation of a MOF-guided nickel-cobalt double-metal phosphide, which is mainly used as an electrocatalyst for the reaction of electrolysis of water and oxygen evolution middle. Background technique [0002] Clean and renewable hydrogen energy is the most ideal alternative energy due to dwindling fossil fuel resources and increasing global pollution. The electrolysis of water is to generate hydrogen (H 2 ) and oxygen (O 2 ) process is one of the most promising methods for large-scale production of renewable hydrogen energy. However, OER requires the transfer of four protons and four electrons, which is difficult to perform from a thermodynamic point of view, and OER is a difficult point in water electrolysis. Currently, IrO 2 and RuO 2 are effective catalysts for O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J35/10C25B11/06C25B1/04
CPCB01J27/1853C25B11/04C25B1/04B01J35/33B01J35/60Y02E60/36
Inventor 莫尊理刘桂桂帅超高琴琴刘晶晶姜洋洋郭微郭瑞斌刘妮娟
Owner NORTHWEST NORMAL UNIVERSITY
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