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Preparation method of noble metal doped bimetallic phosphide catalyst for electrochemical complete water splitting

A bimetal and phosphide technology, applied in the field of electrochemistry, can solve problems such as low activity, and achieve the effects of simple preparation method, good application prospect and low cost

Pending Publication Date: 2022-03-18
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of the prior art, the object of the present invention is to provide a preparation method and application of a noble metal-doped bimetallic phosphide catalyst for electrochemical total water splitting, which is used to solve the problem of electrocatalyst materials in the prior art in electrocatalysis. The problem of low activity in the total water splitting reaction

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  • Preparation method of noble metal doped bimetallic phosphide catalyst for electrochemical complete water splitting
  • Preparation method of noble metal doped bimetallic phosphide catalyst for electrochemical complete water splitting
  • Preparation method of noble metal doped bimetallic phosphide catalyst for electrochemical complete water splitting

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preparation example 1

[0049] This preparation is used to illustrate a preparation method of a noble metal-doped double metal phosphide material for electrocatalytic total water splitting. The method includes:

[0050] Step 101, using ethylene glycol-assisted hydrothermal method to prepare rhodium-doped cobalt-iron double hydroxide;

[0051] Step 102, annealing the rhodium-doped cobalt-iron double hydroxide and sodium hypophosphite in nitrogen to obtain the noble metal-doped double metal phosphide material.

[0052] Specifically, the preparation of rhodium-doped cobalt-iron double hydroxide by ethylene glycol-assisted hydrothermal method in step 101 includes:

[0053] Dissolving soluble cobalt salt, soluble iron salt, soluble rhodium salt and urea in a solvent according to a certain molar ratio to obtain a solution, the solvent being a mixed solvent of ethylene glycol and water at a certain volume ratio;

[0054] After the solution was stirred at room temperature for 30 min, it was poured into a po...

Embodiment 1

[0058] Embodiment 1: the cobalt-iron phosphide doped with rhodium that the ratio of cobalt-iron-rhodium is 2:1:0.1 is prepared

[0059] (1) Dissolve 0.291 g cobalt nitrate hexahydrate, 0.202 g ferric nitrate nonahydrate, 10.46 mg rhodium trichloride and 120 mg urea into 10 ml deionized water and 30 ml ethylene glycol mixed solvent, and stir for 30 minutes;

[0060] (2) Pour the above mixed solution into the polytetrafluoroethylene lining, and place the lining in a stainless steel hydrothermal kettle, and conduct a hydrothermal treatment at 120°C for 12 h;

[0061] (3) After cooling to room temperature, the product is centrifuged, washed with water and freeze-dried to obtain the rhodium-doped cobalt-iron double hydroxide;

[0062] (4) Put 10 mg of rhodium-doped cobalt-iron double hydroxide obtained in (3) into a porcelain boat, put 100 mg of sodium hypophosphite into another porcelain boat upstream of the horizontal tube furnace, and place the material in Annealing at 350° C. ...

Embodiment 2

[0063] Embodiment 2: the cobalt iron phosphide that the ratio of preparation cobalt iron rhodium is 2:1:0.3 doped with rhodium

[0064] (1) Dissolve 0.291 g cobalt nitrate hexahydrate, 0.202 g ferric nitrate nonahydrate, 31.38 mg rhodium trichloride and 120 mg urea into 10 ml deionized water and 30 ml ethylene glycol mixed solvent, and stir for 30 minutes;

[0065] (2) Pour the above mixed solution into the polytetrafluoroethylene lining, and place the lining in a stainless steel hydrothermal kettle, and conduct a hydrothermal treatment at 120°C for 12 h;

[0066] (3) After cooling to room temperature, the product is centrifuged, washed with water and freeze-dried to obtain the rhodium-doped cobalt-iron double hydroxide;

[0067] (4) Put 10 mg of rhodium-doped cobalt-iron double hydroxide obtained in (3) into a porcelain boat, put 100 mg of sodium hypophosphite into another porcelain boat upstream of the horizontal tube furnace, and place the material in Annealing at 350°C fo...

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Abstract

The invention discloses a preparation method of a noble metal doped bimetallic phosphide catalyst for electrochemical complete water splitting. Wherein the precious metal is rhodium, and the bimetallic phosphide is ferrocobalt phosphide. According to the preparation method, cobalt nitrate hexahydrate, iron nitrate nonahydrate, rhodium trichloride and urea are selected as raw materials, an ethylene glycol-assisted hydrothermal method is used for obtaining a rhodium-doped ferrocobalt double hydroxide precursor, then the rhodium-doped ferrocobalt double hydroxide precursor and sodium hypophosphite are annealed in a nitrogen atmosphere, and the petal-shaped rhodium-doped ferrocobalt phosphide nanometer material is obtained. The material can reach the current density of 10mA. Cm <-2 > only by the overpotential of 76mV in HER under an acid reaction condition. In 1 M KOH, when the current density reaches 10 mA. Cm <-2 >, the overpotentials of HER and OER are 48 mV and 303 mV respectively. When the Rh-doped Co2Fe-P composite material is used as a bifunctional electrode for overall water decomposition, the Rh-doped Co2Fe-P composite material can reach the current density of 10mA. Cm <-2 > in 1M KOH by only needing the low battery voltage of 1.54 V, and the current density is kept stable for not less than 30 hours. Meanwhile, the preparation method is simple and easy, the cost is low, the performance can be comparable with that of a commercial noble metal catalyst, and the application prospect is good.

Description

technical field [0001] The invention relates to a preparation method of a noble metal-doped bimetallic phosphide catalyst used for electrochemical total water splitting, belonging to the field of electrochemical technology. Background technique [0002] The excessive consumption of non-renewable energy and the ensuing environmental pollution force us to find and develop renewable clean energy that can replace non-renewable energy. As a clean, efficient, safe and sustainable new energy, hydrogen energy is regarded as one of the most promising clean energy in the 21st century. Hydrogen production by electrolysis of water is an effective way to solve the current dilemma. The electrolysis of water is divided into two half-reactions, namely the hydrogen evolution reaction and the oxygen evolution reaction. The total reaction efficiency of water electrolysis depends on the efficiency of the two half-reactions, and these two reactions are difficult to occur under normal condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/091
CPCC25B1/04C25B11/091Y02E60/36
Inventor 李亮陆永为
Owner EAST CHINA UNIV OF SCI & TECH
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