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A kind of transition metal boride catalyst, preparation method and application thereof

A transition metal and boride technology, applied in the field of inorganic functional materials, can solve the problems of difficulty in single-phase preparation, limited multi-functional properties of transition metal borides, narrow synthesis interval of single-phase, etc., and achieves good catalytic activity, stable performance and reserves Rich, short preparation cycle effect

Active Publication Date: 2021-09-21
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the formation energy of some transition metal borides is close, and the single-phase synthesis interval is narrow, so it is easy to prepare multi-phase mixed borides, but the preparation of single-phase is very difficult
However, the existence of mixed phases limits further research on the potential multifunctional properties of transition metal borides.

Method used

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  • A kind of transition metal boride catalyst, preparation method and application thereof
  • A kind of transition metal boride catalyst, preparation method and application thereof
  • A kind of transition metal boride catalyst, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Preparation of RuB 1.1 : (1) Under the irradiation of infrared lamp, according to M (representing the chloride salt of transition metal): MgB 2 : The molar ratio of Mg is 2:1:2. Weigh the corresponding mass of metal source, magnesium diboride and magnesium powder, namely hydrated potassium pentachlororuthenate 0.112g (0.3mmol), magnesium diboride 0.007g (0.15mmol) ) and 0.0072 g (0.3 mmol) of magnesium powder into a mortar, grind and mix them uniformly.

[0022] (2) Transfer the mixed powder obtained in step (1) into a quartz tube, use a vacuum rack to evacuate, and perform vacuum sealing when the vacuum degree drops below 1Pa.

[0023] (3) Put the quartz tube after the vacuum-sealed sample in step (2) into a muffle furnace, calcined at a temperature of 700 ° C for 7 hours, and the heating rate is 2 ° C min -1 .

[0024] (4) After cooling to room temperature, take out the sample, and after grinding, put in 0.5mol L -1 Soak in the sulfuric acid solution for 3 hours t...

Embodiment 2

[0027] Same as Example 1, M:MgB 2 : The molar ratio of Mg is changed to 2:1:1, the metal source is anhydrous ferrous chloride, the reaction temperature is 850 °C, and the time is 5 hours, and FeB can be prepared.

Embodiment 3

[0029] Same as Example 1, M:MgB 2 The molar ratio of Mg:Mg was changed to 2:1:4, the metal source was anhydrous molybdenum pentachloride, the reaction temperature was 850°C, and the time was 5 hours, and then MoB could be prepared.

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Abstract

A transition metal boride catalyst, a preparation method and its application in electrocatalytic water splitting for hydrogen production belong to the technical field of inorganic functional materials. The present invention relates to a kind of preparation method of transition metal boride catalyst, take transition metal chloride as metal source, MgB 2 As a boron source, Mg powder assists in the quasi-solid phase displacement reaction, the reaction temperature is 700°C-1000°C, and the reaction time is 3-10 hours. Through the method, different metal sources can be selected to obtain a series of pure-phase transition metal boride catalysts, such as VB, NbB, TaB, CrB, MoB, WB, FeB, RuB 1.1 All of the above catalysts have electrocatalytic activity. where RuB 1.1 Optimal, with excellent catalytic activity and stability under acidic conditions, with a current density of 10mA cm ‑2 , the required overpotential is 24mV.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and in particular relates to a transition metal boride catalyst, a preparation method and its application in electrocatalytic water splitting for hydrogen production. Background technique [0002] Serious problems such as the growing world population, environmental degradation and energy shortage have promoted the rapid development of clean, renewable and green energy. Electrocatalytic water splitting for hydrogen production uses renewable resources, which is in line with the sustainable development of modern society and economy. Pt-based materials are currently the most efficient electrocatalytic materials, but their high cost and low reserves limit their applications. Therefore, it is of great significance to develop low-cost and efficient Pt-based alternative electrocatalysts. [0003] Transition metal borides are a class of multifunctional materials with high electrica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/075C25B1/04C01B35/04
CPCY02E60/36
Inventor 邹晓新李秋菊邹旭李国栋
Owner JILIN UNIV