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Preparation method of self-support transition metal sulfide foamed electrode for water decomposition

A transition metal, self-supporting technology, applied in the direction of electrodes, electrolysis processes, electrode shapes/types, etc., can solve problems such as hindering electron transfer to current collector electrodes, active material shedding, and limiting overall catalytic efficiency

Active Publication Date: 2017-07-04
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these electrocatalysts are semiconductors or insulators, which greatly hinder the transfer of electrons from the electrocatalyst to the current collector electrode, thereby limiting their overall catalytic efficiency and reducing the potential utilization value.
On the other hand, when the generated gas is desorbed and precipitated on the surface of the active material, the bubbles formed by the aggregation are very buoyant, and the precipitation rate is very fast, which will easily cause the active material to fall off from the surface of the current collector electrode, resulting in poor durability of the electrode.

Method used

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  • Preparation method of self-support transition metal sulfide foamed electrode for water decomposition
  • Preparation method of self-support transition metal sulfide foamed electrode for water decomposition
  • Preparation method of self-support transition metal sulfide foamed electrode for water decomposition

Examples

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Effect test

Embodiment 1

[0012] Example 1 (Ni / Co-S)

[0013] Nickel foam was washed with dilute hydrochloric acid, ethanol, and ultrapure water as cathode, cobalt rod as anode, cobalt chloride and cobalt sulfate as electroplating solution, and the current density was 2mA cm -2 Electrodeposition was performed for 2 hours; the deposited metal foam was placed in a reaction kettle, and a thiourea solution with a concentration of 0.04M was added for 24 hours of hydrothermal reaction to obtain a self-supporting bifunctional nickel-cobalt sulfide foam electrode.

[0014] figure 1 For the X-ray diffraction pattern (XRD) of the nickel-cobalt sulfide foam electrode that embodiment 1 prepares, it can be seen that this electrode contains NiS and CoS two phases, scanning electron microscope (SEM) figure (attachment figure 2 ) It can be seen that rods are closely arranged on the surface of the metal foam. Using the nickel-cobalt sulfide foam electrode as both the cathode and the anode, electrochemical voltammetr...

Embodiment 2

[0015] Example 2 (Ni / Mo-S)

[0016] The nickel foam was washed with dilute hydrochloric acid, ethanol, and ultrapure water as the cathode, the molybdenum rod as the anode, and the sodium molybdate as the electroplating solution with a current density of 2mA cm -2 Electrodeposition was carried out for 2 hours; the deposited metal foam was placed in a reaction kettle, and a thiourea solution with a concentration of 0.04M was added for 24 hours of hydrothermal reaction to obtain a self-supporting bifunctional nickel-molybdenum sulfide foam electrode. attached Figure 5 The scanning electron microscope image of the electrode shows that the network structure is wound on the surface of the foam matrix, which increases the specific surface area of ​​the electrode.

Embodiment 3

[0017] Example 3 (Ni / NiMo-S)

[0018] The nickel foam was washed with dilute hydrochloric acid, ethanol, and ultrapure water as the cathode, the carbon rod was used as the anode, and sodium molybdate, nickel sulfate, and ammonium citrate were used as the electroplating solution, and the current density was 2mA cm -2 Electrodeposition was carried out for 1 hour; the deposited metal foam was placed in a reaction kettle, and a thiourea solution with a concentration of 0.05M was added for 12 hours of hydrothermal reaction to obtain a self-supporting bifunctional nickel-molybdenum sulfide foam electrode.

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Abstract

The invention provides a preparation method of a self-support transition metal sulfide foamed electrode for water decomposition, and belongs to the field of electric catalysis water decomposition. The electrode is obtained by modifying the surface of foamed nickel, a single element, by an electric deposition method to synthesize a binary or multi-element alloy; and then, synthesized foamed transition metal is immersed in a thiourea solution for hydrothermal reaction to obtain the self-support double-function transition metal sulfide foamed electrode. The prepared sulfide electrode is synchronously applied to a cathode and an anode of electrolyzed water, and achieves excellent electro-catalysis hydrogen evolution and oxygen evolution performance.

Description

technical field [0001] The invention relates to a preparation method of a self-supporting transition metal sulfide foam electrode for water splitting, belonging to the field of electrocatalytic water splitting. Background technique [0002] With the growth of the earth's population and the rapid development of the economy, the depletion of fossil fuel resources has been accelerated, and at the same time it has brought about huge environmental pollution problems. Hydrogen (H 2 ) is regarded as the most promising energy carrier because of its wide sources, high energy density, and non-polluting combustion products. As we all know, the electrolysis of water is to produce H 2 The cleanest way, it does not emit the greenhouse gas CO as the natural gas reforming process 2 and other air pollutants. More importantly, the H obtained by electrolysis of water 2 High purity, free of carbon monoxide and other impurities, can be directly used as fuel cell feed to avoid anode catalyst ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B11/06C25B1/04C25D5/48
CPCC25B1/04C25D5/48C25B11/031C25B11/051C25B11/091Y02E60/36
Inventor 王孝广马自在杨周琴
Owner TAIYUAN UNIV OF TECH
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