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A kind of cobalt borophosphate material and its preparation method and application

A cobalt borophosphate material and technology of cobalt borophosphate, applied in chemical instruments and methods, physical/chemical process catalysts, electrolytic components, etc., can solve the problems of large initial potential, poor stability, high overpotential, etc., and achieve low overpotential , particle size is small, the effect of improving efficiency

Active Publication Date: 2020-11-17
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, problems such as high cost, large initial potential, high overpotential, and poor stability of existing catalysts need to be solved urgently.

Method used

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  • A kind of cobalt borophosphate material and its preparation method and application
  • A kind of cobalt borophosphate material and its preparation method and application
  • A kind of cobalt borophosphate material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0037] The preparation of a novel cobalt borophosphate crystal material comprises the following steps: mixing cobalt nitrate, sodium borate, ammonium phosphate, and polyvinylpyrrolidone (12KDa) with water in a molar ratio of 1.5:0.45:0.4:1.5:7, heating and stirring Evenly, the initial gel mixture is obtained, and the pH of the gel mixture is measured to be 1.0; the resulting initial gel mixture is transferred to a polytetrafluoroethylene hydrothermal reaction kettle, sealed and placed in a box-type resistance furnace, at a temperature of 160 ° C Crystallize for 8 hours, cool to room temperature, filter, and wash five times with a mixed solvent of water and ethanol to obtain H(NH 3 ) 2 Co(H 2 O) 2[BP 2 o 8 ] crystalline material, namely the sample NCoBPi-PVP.

[0038] The above crystalline material was placed in a watch glass and dried in an oven at 50°C for 1 hour, and then calcined at 450°C for 1 hour in a nitrogen atmosphere to obtain the N-doped cobalt borophosphate ca...

Embodiment 2

[0040] The preparation of a novel cobalt borophosphate crystal material comprises the following steps: mixing cobalt chloride, sodium metaborate, diammonium hydrogen phosphate, and polyvinylpyrrolidone (60KDa) with water in a molar ratio of 1.0:0.45:0.4:1.5:6 Mix, heat and stir evenly to obtain an initial gel mixture, and the pH of the gel mixture is measured to be 2.0; the resulting initial gel mixture is transferred to a polytetrafluoroethylene hydrothermal reaction kettle, sealed and put into a box-type resistance furnace, Crystallize at 180°C for 10 hours, cool to room temperature, filter, and wash four times with a mixed solvent of water and ethanol to obtain H(NH 3 ) 2 Co(H 2 O) 2 [BP 2 o 8 ] crystalline material, namely the sample NCoBPi-PVP.

[0041] The above crystal material was placed in a watch glass and dried in an oven at 80°C for 1 hour, and then calcined at 200°C for 2 hours in a nitrogen atmosphere to obtain the N-doped cobalt borophosphate catalyst mater...

Embodiment 3

[0043] The preparation of a novel cobalt borophosphate crystal material comprises the following steps: mixing cobalt acetate, boric acid, ammonium dihydrogen phosphate, and polyvinylpyrrolidone (150KDa) with water in a molar ratio of 2.0:0.5:0.6:1.8:10, heating Stir evenly to obtain an initial gel mixture, and the measured pH of the gel mixture is 4.0; transfer the obtained initial gel mixture to a polytetrafluoroethylene hydrothermal reaction kettle, seal it and put it in a box-type resistance furnace, and heat it at 220°C Crystallize at high temperature for 20 hours, cool to room temperature, filter, and wash three times with a mixed solvent of water and ethanol to obtain H(NH 3 ) 2 Co(H 2 O) 2 [BP 2 o 8 ] crystalline material, namely the sample NCoBPi-PVP.

[0044] The above crystal material was placed in a watch glass and dried in an oven at 80°C for 2 hours, and then calcined at 800°C for 4 hours in a nitrogen atmosphere to obtain the N-doped cobalt borophosphate cat...

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Abstract

The invention discloses a boron cobalt phosphate material and its preparation method and application. The method combines boron source, cobalt source, phosphorus source and surfactant with water according to the ratio of 0.5~2:0.25~0.5:0.2~0.6:1.1~1.8 :5~10 Mix, heat and stir evenly to obtain the initial gel mixture, transfer to a polytetrafluoroethylene hydrothermal reactor, seal and place in a box-type resistance furnace, crystallize, cool to room temperature, filter, use water and ethanol Wash with mixed solvent to obtain H(NH 3 ) 2 Co(H 2 O) 2 [BP 2 O 8 ] Crystal material; dry the prepared crystal material in an oven for 1 hour, and calcine it in a high-temperature inert gas atmosphere for 1 to 4 hours to obtain N-doped boron cobalt phosphate catalyst material. The N-doped cobalt boron phosphate catalytic material is used in metal air batteries, fuel cells, lithium oxygen batteries or lithium batteries as a catalyst in electrocatalytic oxygen evolution reactions.

Description

technical field [0001] The invention belongs to the field of preparation of electrochemical catalysts, in particular to a preparation method of borophosphate materials which can be used to catalyze oxygen evolution reaction (OER). Background technique [0002] As the global energy shortage and the corresponding climate change become increasingly serious, it is imminent to seek alternative green energy. Hydrogen energy is recognized as clean energy, with the characteristics of non-polluting, non-toxic, and high energy density, so it is very important to develop efficient and stable mass production of hydrogen technology. Nowadays, electrocatalytic water splitting has become the most promising technology for hydrogen production. However, as an important half-reaction in the anode of water splitting, the oxygen evolution process (OER) in the splitting process is limited by the kinetically slow four-electron transfer process, and an efficient electrocatalyst is necessary to red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185B01J35/10B01J27/24C25B11/06C25B1/04
CPCB01J27/1853B01J27/24C25B11/04C25B1/04B01J35/33B01J35/61Y02E60/36
Inventor 宋俊玲王彬鲁文秀
Owner JIANGNAN UNIV
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