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Preparation method, product and application of low-temperature phosphorus-doped carbon nitride loaded high-dispersion palladium hydrogen evolution catalyst

A technology of phosphorus doping and carbon nitride, which is applied in the field of hydrogen evolution catalyst preparation, can solve the problems of high requirements for substrate materials and experimental equipment, uneven particle dispersion, and restrictions on wide application, so as to improve photocatalytic performance and simple preparation method , Improve the effect of Schottky barrier

Active Publication Date: 2020-10-16
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods either have high reaction temperature, long time consumption, or high requirements on substrate materials and experimental equipment, which limit their wide application.
[0006] At present, there are problems such as particle loss, uneven particle dispersion, and the introduction of surfactants in the preparation process of carbon nitride-supported nano-metals, such as high cost and complicated operation.

Method used

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  • Preparation method, product and application of low-temperature phosphorus-doped carbon nitride loaded high-dispersion palladium hydrogen evolution catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A low-temperature phosphorus-doped carbon nitride-supported hydrogen evolution catalyst with highly dispersed palladium is prepared according to the following steps:

[0032] 1), preparation of phosphorus-doped carbon nitride:

[0033] a) Weigh melamine, hydroxyethylidene diphosphonic acid, ethylene glycol and deionized water, wherein the mass ratio of melamine and hydroxyethylidene diphosphonic acid is 1: 0.4, and the mass ratio of melamine and deionized water is 1 :100; the mass ratio of ethylene glycol to deionized water is 1:10, first add melamine and hydroxyethylidene diphosphonic acid to the mixed solution of deionized water and ethylene glycol, heat to 80°C and stir to evaporate it dry; then,

[0034] b) Put the above white solid into a ceramic crucible, bake in a muffle furnace at 500 °C for 4 h, and then cool naturally to obtain phosphorus-doped carbon nitride powder.

[0035] 2), preparation of phosphorus-doped carbon nitride supported Pd metal particles:

...

Embodiment 2

[0040] A low-temperature phosphorus-doped carbon nitride-loaded hydrogen evolution catalyst with highly dispersed palladium, similar to Example 1, prepared according to the following steps:

[0041] 1), preparation of phosphorus-doped carbon nitride:

[0042] a), weigh melamine, hydroxyethylidene diphosphonic acid, ethylene glycol and deionized water, wherein the mass ratio of melamine and hydroxyethylidene diphosphonic acid is 1:0.1, and the mass ratio of melamine and deionized water is 1 :200, the mass ratio of ethylene glycol to deionized water is 1:5; first add melamine and hydroxyethylidene diphosphonic acid to the mixed solution of deionized water and ethylene glycol, heat to 100 ℃ and stir to evaporate it dry to obtain a white solid; then,

[0043] b) Put the white solid above into a ceramic crucible, bake it in a muffle furnace at 600 °C for 3 h, and then cool it down naturally to obtain phosphorus-doped carbon nitride powder.

[0044] 2), preparation of low-temperat...

Embodiment 3

[0048] A low-temperature phosphorus-doped carbon nitride-loaded hydrogen evolution catalyst with highly dispersed palladium, similar to Example 1, prepared according to the following steps:

[0049] 1), preparation of phosphorus-doped carbon nitride:

[0050] a), take melamine, hydroxyethylidene diphosphonic acid, ethylene glycol and deionized water, wherein, the mass ratio of melamine and hydroxyethylidene diphosphonic acid is 1:0.2, and the mass ratio of melamine and deionized water is 1:500, the mass ratio of ethylene glycol to deionized water is 1:1; first add melamine and hydroxyethylidene diphosphonic acid to the mixed solution of deionized water and ethylene glycol, heat to 90 ℃ and stir to It was evaporated to dryness to give a white solid; then,

[0051] b) put the above white solid into a ceramic crucible, bake it in a muffle furnace at a temperature of 550°C for 5 hours, and then naturally cool to obtain phosphorus-doped carbon nitride powder;

[0052] 2), prepara...

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Abstract

The invention provides a preparation method of a low-temperature phosphorus-doped carbon nitride loaded high-dispersion palladium hydrogen evolution catalyst and a product and application thereof. Thepreparation method of the phosphorus-doped carbon nitride loaded high-dispersion metal Pd particle hydrogen evolution catalyst is relatively simple in synthesis method, low in cost and capable of reacting at a low temperature. According to the invention, phosphorus is doped into a carbon nitride substrate, so that the Schottky barrier of the heterojunction is improved, meanwhile, by means of theaction of lone pair electrons of nitrogen and metal Pd, the dispersity of Pd nano particles is improved to a great extent, and loss of Pd is reduced. By improving the Schottky heterojunction barrier,more free electrons can flow to the Pd nano particles from the phosphorus-doped carbon nitride substrate, so that the electron aggregation of the Pd nano particles is greatly improved. The prepared phosphorus-doped carbon nitride loaded Pd metal nano-catalyst can be used in borane ammonia hydrogen evolution reaction, and the catalyst shows very high catalytic activity under visible light irradiation.

Description

technical field [0001] The invention relates to the technical field of hydrogen evolution catalysts and their preparation, in particular to a method for preparing a low-temperature phosphorus-doped carbon nitride-loaded hydrogen evolution catalyst with highly dispersed palladium, as well as its products and applications. Background technique [0002] The depletion of fossil energy and the increasingly serious problem of environmental pollution are major issues that threaten the survival and development of human beings. Finding and developing green renewable energy that can replace fossil energy has become the focus of research at home and abroad. Solar energy has become a new choice to replace fossil energy due to its clean and pollution-free, wide distribution and abundant reserves. As a means of converting low-density solar energy into high-density chemical energy, photocatalytic technology has attracted more and more attention from many researchers because of its mild rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/16B82Y30/00B82Y40/00C01B3/04
CPCB01J27/24B01J37/082B01J37/16B82Y30/00B82Y40/00C01B3/04B01J35/394B01J35/39Y02E60/36
Inventor 崔大祥王敬锋金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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