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Carbon-supported iridium-molybdenum-tungsten intermetallic compound and preparation method and application thereof

A technology of intermetallic compounds, molybdenum and tungsten, applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of lower reaction rate than acidic environment, slow kinetics, limited reserves, etc., and achieve good electrocatalytic activity and stability, The effect of improving utilization rate and simple preparation method

Active Publication Date: 2022-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the development of high-performance catalysts for OER and HER still faces many problems, as follows: 1) The OER reaction at the anode, whether it is in an acidic water electrolysis system or an alkaline electrolysis water system, due to the multi-electron-proton coupling process involved , the kinetics are very sluggish, even if the noble metal iridium and iridium oxides are used as catalysts, a high overpotential is still required to catalyze OER, and due to the strong corrosion (high potential and strong acid) of the acidic system, fresh There are materials that can stably maintain high OER activity; 2) The HER reaction in acidic systems has higher reaction kinetics than in alkaline systems, and the acidic HER catalysts with the best activity are mainly noble metal platinum catalysts, and the reserves of platinum are limited , and the price is expensive, there is no non-precious metal-based acidic system HER catalyst that can meet the practical application; 3) HER reaction in the alkaline system involves a multi-step water dissociation process, and the reaction rate is far lower than that in the acidic environment, even the noble metal catalyst , and its efficiency is relatively low, although most non-precious metal-based catalysts can be stable in alkaline environments, but their activity is much lower than that of noble metal-based catalysts

Method used

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  • Carbon-supported iridium-molybdenum-tungsten intermetallic compound and preparation method and application thereof
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  • Carbon-supported iridium-molybdenum-tungsten intermetallic compound and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0046] A carbon-supported iridium-molybdenum-tungsten intermetallic compound, the preparation method of which comprises the following steps:

[0047] 1) Add 4g of commercial carbon nanotubes to 400g of 10% nitric acid aqueous solution by mass fraction, then stir for 12h at 160°C and 300r / min, filter, wash the filtered solid 3 times, and then transfer to vacuum drying Dry in an oven at 100°C for 6 hours to obtain hydrophilic modified carbon nanotubes;

[0048] 2) the trihydrate iridium chloride solution of concentration 0.055mol / L, the tetrahydrate ammonium molybdate solution of concentration 0.055mol / L and the carbon nanotube of 80mg hydrophilic modification are mixed, make the total mass of iridium element and molybdenum element and The mass ratio of hydrophilic modified carbon nanotubes is 1:4, the molar ratio of iridium element and molybdenum element is 1:1, ultrasonication is performed for 3.5 hours, and the mixture obtained by ultrasonication is added to a freeze-drying d...

Embodiment 2

[0050] A carbon-supported iridium-molybdenum-tungsten intermetallic compound, the preparation method of which comprises the following steps:

[0051] 1) Add 4 g of commercial carbon nanotubes to 220 g of aqueous nitric acid solution with a mass fraction of 40%, then stir for 7 h at 110° C. and a rotation speed of 750 r / min, filter, wash the filtered solid with water for 3 times, and then transfer to vacuum drying Dry in an oven at 100°C for 6 hours to obtain hydrophilic modified carbon nanotubes;

[0052] 2) Mix the iridium chloride trihydrate solution with a concentration of 0.005mol / L, the ammonium tungstate tetrahydrate solution with a concentration of 0.005mol / L and 80mg of hydrophilic modified carbon nanotubes, so that the total mass of iridium and tungsten elements is equal to The mass ratio of hydrophilic modified carbon nanotubes is 1:9, the molar ratio of iridium element and tungsten element is 1:1, sonication for 0.5h, the mixture obtained by sonication is added to a...

Embodiment 3

[0054] A carbon-supported iridium-molybdenum-tungsten intermetallic compound, the preparation method of which comprises the following steps:

[0055] 1) Add 4g of commercial carbon nanotubes to 40g of aqueous nitric acid solution with a mass fraction of 70%, then stir for 2 hours at 60°C and a rotation speed of 1200r / min, filter, wash the filtered solid with water for 3 times, and then transfer to vacuum drying Dry in an oven at 100°C for 6 hours to obtain hydrophilic modified carbon nanotubes;

[0056] 2) The iridium chloride trihydrate solution with a concentration of 0.0225mol / L, the ammonium molybdate tetrahydrate solution with a concentration of 0.01125mol / L, the ammonium tungstate tetrahydrate solution with a concentration of 0.01125mol / L and 80mg of hydrophilic modified carbon nano The tubes are mixed so that the mass ratio of the total mass of iridium, molybdenum and tungsten to the hydrophilic modified carbon nanotube is 3:7, and the molar ratio of iridium, molybdenum...

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Abstract

The invention discloses a carbon-supported iridium-molybdenum-tungsten intermetallic compound and a preparation method and application thereof. The carbon-loaded iridium-molybdenum-tungsten intermetallic compound comprises a carbon carrier and a loaded iridium-molybdenum-tungsten intermetallic compound, the chemical formula of the iridium-molybdenum-tungsten intermetallic compound is IrMo (1-x) Wx, and x is more than or equal to 0 and less than or equal to 1. The preparation method of the carbon-loaded iridium-molybdenum-tungsten intermetallic compound comprises the following steps: uniformly mixing an iridium source, a molybdenum source or / and a tungsten source and a carbon carrier in a solvent system, removing a solvent, and carrying out heat treatment in a reducing atmosphere to obtain the carbon-loaded iridium-molybdenum-tungsten intermetallic compound. The carbon-supported iridium molybdenum tungsten intermetallic compound has excellent electrocatalytic hydrogen evolution and oxygen evolution activity in both acidic electrolyte and alkaline electrolyte, is simple in preparation method, and is suitable for being used as a cathode / anode catalyst in an acidic / alkaline water electrolysis device.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by electrolysis of water, in particular to a carbon-supported iridium-molybdenum-tungsten intermetallic compound and a preparation method and application thereof. Background technique [0002] Hydrogen energy is a high-energy-density, zero-emission renewable energy, known as the most promising energy carrier in the future. At present, the acquisition of hydrogen energy mainly includes reforming hydrogen production and electrolysis of water to produce hydrogen, and using the electric energy generated by intermittent energy power generation to electrolyze water is an important way to realize the sustainable development of hydrogen energy. [0003] Oxygen evolution reaction (OER) at the anode and hydrogen evolution reaction (HER) at the cathode during hydrogen production from water electrolysis are key processes that affect the overall efficiency of hydrogen production from water electrol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/089C25B11/065C25B11/054C25B1/04C22C5/04
CPCC25B11/089C25B11/065C25B11/054C25B1/04C22C5/04Y02E60/36Y02P20/133
Inventor 崔志明张嘉熙张龙海涂院华钟子颖
Owner SOUTH CHINA UNIV OF TECH
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