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Method for preparing self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in eutectic ionic liquid

A technology of ionic liquid and hydrogen evolution electrode, which is applied in electrolytic inorganic material coatings, electrodes, electrolytic components, etc., can solve the problems of poor catalytic stability, loose structure of deposited film products, easy to fall off, etc., and achieve controllable conditions and excellent catalytic hydrogen evolution activity , the effect of a simple formula

Active Publication Date: 2022-05-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of cobalt-based phosphides by electrodeposition in traditional aqueous solution systems is disturbed by the side reaction of hydrogen evolution, and the deposited film products are often loose in structure, easy to fall off, and poor in catalytic stability.

Method used

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  • Method for preparing self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in eutectic ionic liquid
  • Method for preparing self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in eutectic ionic liquid
  • Method for preparing self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in eutectic ionic liquid

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Effect test

Embodiment 1

[0027] The method for preparing a self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in a deep eutectic ionic liquid, the specific steps are as follows:

[0028] Step 1. Configuration of the electrolytic system: select 50mL of eutectic ionic liquid (Reline system of choline chloride-urea combination with a molar ratio of 1:2) as the solvent, and add 0.1mol cobalt salt to the eutectic ionic liquid The precursor (cobalt chloride hexahydrate), doped metal salt precursor (nickel chloride hexahydrate) and phosphorus precursor (sodium hypophosphite) are mixed evenly, wherein the cobalt salt precursor, doped metal salt precursor and phosphorus precursor The volume molar ratio is 1:0.5:0.3, and the ionic liquid-cobalt-based double metal salt-phosphorus salt composite electrolytic system is obtained;

[0029] Step 2. Substrate pretreatment: The substrate is copper (1.5cm×1.5cm×0.1cm), and the substrate is soaked i...

Embodiment 2

[0034] The method for preparing a self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in a deep eutectic ionic liquid, the specific steps are as follows:

[0035]Step 1. Configuration of the electrolytic system: select 50mL of eutectic ionic liquid (Ethaline system with a molar ratio of 1:2 choline chloride-ethylene glycol combination) as the solvent, and add 0.1mol cobalt to the eutectic ionic liquid Salt precursor (cobalt chloride hexahydrate), doped metal salt precursor (ferric chloride heptahydrate) and phosphorus precursor (sodium hypophosphite) are mixed evenly, wherein cobalt salt precursor, doped metal salt precursor and phosphorus The molar ratio of the precursor is 1:0.5:0.2, and the ionic liquid-cobalt-based double metal salt-phosphorus salt composite electrolytic system is obtained;

[0036] Step 2. Substrate pretreatment: The substrate is nickel foam (1.5cm×1.5cm×0.1cm), and the substrate is s...

Embodiment 3

[0040] The method for preparing a self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in a deep eutectic ionic liquid, the specific steps are as follows:

[0041] Step 1. Configuration of the electrolytic system: select 50mL deep eutectic ionic liquid (Glyceline system with a molar ratio of 1:2 choline chloride-glycerol combination) as the solvent, and add 0.05mol cobalt to the deep eutectic ionic liquid Salt precursor (cobalt chloride hexahydrate), doped metal salt precursor (zinc chloride) and phosphorus precursor (sodium hydrogen hypophosphite) are mixed evenly, wherein cobalt salt precursor, doped metal salt precursor and phosphorus precursor The volume molar ratio is 0.5:0.3:0.1, and the composite electrolytic system of ionic liquid-cobalt-based double metal salt-phosphorus salt is obtained;

[0042] Step 2. Substrate pretreatment: The substrate is a conductive glass sheet (1.5cm×1.5cm×0.1cm), and the...

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Abstract

The invention relates to a method for preparing a self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in a deep eutectic ionic liquid, and belongs to the technical field of material preparation. First, the cobalt salt precursor, the metal-doped salt precursor and the phosphorus salt precursor are added to the eutectic ionic liquid to prepare an electrolytic system, and the matrix including copper, nickel, titanium, iron or conductive glass is used as the cathode. Electrochemical controllable deposition is carried out at a temperature below 353K to prepare nano-cobalt-based bimetallic phosphide thin film catalytic hydrogen evolution electrode materials. The present invention is based on eutectic ionic liquid as electrolyte, and prepares self-supporting cobalt-based bimetallic phosphide catalytic electrode material by electrochemical deposition method. The cobalt-based bimetallic phosphide electrode material has excellent catalytic hydrogen evolution activity and is suitable for Widely acidic and alkaline solutions with a pH of 0-14 and seawater media; the preparation method has the advantages of controllability, mild reaction conditions, and low cost.

Description

technical field [0001] The invention relates to a method for preparing a self-supporting nano-cobalt-based bimetallic phosphide catalytic hydrogen evolution electrode material by electrodeposition in a deep eutectic ionic liquid, and belongs to the technical field of material preparation. Background technique [0002] Cobalt and cobalt-based materials are widely used as cheap catalysts in photocatalytic hydrogen reactions, such as elemental cobalt, cobalt oxide, cobalt sulfide, cobalt hydroxide, etc., but the hydrogen production efficiency of these catalytic materials is still much higher than that of noble metal Pt. gap. The study found that cobalt phosphides have good metal conductivity and "enrichment effect", showing great application potential in electrocatalytic water splitting for hydrogen production. Among them, the negatively charged "p" as a proton acceptor can weaken the binding force of cobalt-hydrogen bond, thereby promoting the desorption of hydrogen and reduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/66C25D9/08C25B1/04C25B11/052C25B11/075
CPCC25B1/04C25D3/665C25D9/08C25B11/075Y02E60/36
Inventor 张启波杨闯华一新徐存英李艳
Owner KUNMING UNIV OF SCI & TECH
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