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Preparation method and application of a high-efficiency hydrogen evolution catalyst ir@nbd-c

A catalyst and hydrogen evolution technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of difficult control of material synthesis conditions and harsh size conditions of metal nanoparticles

Active Publication Date: 2021-07-06
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the control of the size of metal nanoparticles requires harsh conditions, and the material synthesis conditions are not easy to control

Method used

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  • Preparation method and application of a high-efficiency hydrogen evolution catalyst ir@nbd-c
  • Preparation method and application of a high-efficiency hydrogen evolution catalyst ir@nbd-c
  • Preparation method and application of a high-efficiency hydrogen evolution catalyst ir@nbd-c

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Embodiment 1

[0046] A method for preparing a high-efficiency hydrogen evolution catalyst Ir@NBD-C, which specifically includes the following steps:

[0047] 1) Add 200 mg of commercial Ketjen Black to 100 ml of toluene for ultrasonic treatment for 30 min to form No. 1 mixed solution;

[0048] 2) Add 2.4g of potassium hydroxide to 50 ml of absolute ethanol, and stir magnetically for 30 minutes to form the No. 2 mixed solution;

[0049] 3) Mix No. 1 mixed solution and No. 2 mixed solution, and then perform magnetic stirring for 120 min to form No. 3 mixed solution;

[0050] 4) Transfer the mixed liquid No. 3 to a three-necked bottle, heat it in an oil bath at 115 °C for 2.5 h, and at the same time continue to mechanically stir until the organic solvent volatilizes, and collect a brown-yellow powder;

[0051] 5) The obtained powder sample was calcined at 700 °C for 0.5 h in an argon atmosphere to obtain a black block;

[0052] 6) with 0.5 M H 2 SO 4 Fully wash the black block to remove al...

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Abstract

The invention relates to a preparation method of a high-efficiency hydrogen evolution (HER) catalyst Ir@NBD‑C, which comprises mixing a defective carbon substrate with deionized water; Powder sample; placed in an inert atmosphere and calcined at 600±50°C for 1‑2 h to obtain the hydrogen evolution catalyst Ir@NBD‑C‑600. The high-efficiency hydrogen evolution catalyst material in the present invention slows down the growth rate of particles by utilizing the tethering effect of nitrogen and boron on metal single atoms and metal clusters, reduces the diameter of noble metal nanoparticles to below 2 nm, and realizes Evenly distributed. The reduction of particle diameter enables the catalyst to have a higher specific surface area; it also enables the catalyst to expose more active surfaces that are beneficial to catalysis. In turn, the overpotential of the catalyst at a certain current density in the HER process is significantly reduced; and the tethering effect of nitrogen and boron makes the metal nanoparticles maintain good stability during the cycle.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanomaterial chemistry and electrochemical technology, and specifically relates to a high-efficiency carbon composite hydrogen evolution catalyst material Ir@NBD-C, a preparation method and its application in improving the hydrogen evolution performance of the catalyst. Background technique [0002] As a key electrochemical reaction in fuel cells, the hydrogen evolution reaction has attracted more and more attention. In order to improve the energy conversion efficiency, we urgently need an electrochemical catalyst to effectively increase the kinetic reaction rate of HER in fuel cells. Currently, various non-noble metal electrocatalysts such as transition metal sulfides, phosphides, carbides, nitrides, alloys, oxides, carbon-based metal-free materials, etc. have been reported to reduce the cost. However, noble metal catalysts, especially platinum group catalyst materials, still occupy an importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/02B01J35/10C25B11/091C25B1/04B01J35/00
CPCB01J27/24C25B11/04C25B1/04B01J35/394B01J35/50B01J35/33B01J35/40B01J35/61Y02E60/36
Inventor 张佳楠程俊淇李进
Owner ZHENGZHOU UNIV
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