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Preparation and application of molybdenum-doped cobalt selenide foamed nickel composite electrode for electrolyzing water

A composite electrode, nickel foam technology, applied in the field of electrolysis of water, can solve the problems of high cost, scarcity of scarce resources for large-scale applications, etc.

Inactive Publication Date: 2020-05-05
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, noble metals and noble metal oxide alloys or metal oxides (such as Pt and IrO 2 ) have proven to be state-of-the-art catalysts for electrolysis of water, but their large-scale application is limited by the scarcity and high cost of scarce resources

Method used

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  • Preparation and application of molybdenum-doped cobalt selenide foamed nickel composite electrode for electrolyzing water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a molybdenum-doped cobalt selenide foam nickel composite electrode, comprising the following steps:

[0025] (1) Preparation of foamed nickel: Cut the foamed nickel (NF) into a certain size (2cm×1cm), then ultrasonically clean the foamed nickel in 1M HCl solution, ultrapure water, and acetone for 20 minutes, and dry it for use.

[0026] (2) Preparation of Co(OH) 2 NS@NF: Electrodeposition is carried out on the surface of NF. During the electrodeposition process, 0.1M Co(NO 3 ) 2 As an electrolyte, use a current density of 1.0mA cm at room temperature -2 Electrodeposition of Co(OH) on NF by galvanostatic electrolysis 2 Nanosheets (Co(OH) 2 NS@NF) for 30min, and the product was dried in a drying oven at 60°C for 24 hours.

[0027] (3) Preparation of Mo-CoSe 2 NS@NF

[0028] Na with a molar ratio of 0.6:1 2 MoO 4 2H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in 30ml of ultrapure water, stirred for 30min and then transferred to a 50mL Te...

Embodiment 2

[0030] A preparation method of a molybdenum-doped cobalt selenide foam nickel composite electrode, comprising the following steps:

[0031] (1) Preparation of foamed nickel: Cut the foamed nickel (NF) into a certain size (2cm×1cm), then ultrasonically clean the foamed nickel in 1.5M HCl solution, ultrapure water, and acetone for 30 minutes, and dry it for use.

[0032] (2) Preparation of Co(OH) 2 NS@NF: Electrodeposition is carried out on the surface of NF. During the electrodeposition process, 0.1M Co(NO 3 ) 2 As the electrolyte, the current density used at room temperature is 2.0mA cm -2 Electrodeposition of Co(OH) on NF by galvanostatic electrolysis 2 Nanosheets (Co(OH) 2 NS@NF) for 20min, and the product was dried in a drying oven at 60°C for 24 hours.

[0033] (3) Preparation of Mo-CoSe 2 NS@NF

[0034] Na with a molar ratio of 0.6:1 2 MoO 4 2H 2 O and Co(NO 3 ) 2 ·6H2 O was dissolved in 30ml of ultrapure water, stirred for 30min and then transferred to a 50m...

Embodiment 3

[0036] A preparation method of a molybdenum-doped cobalt selenide foam nickel composite electrode, comprising the following steps:

[0037] (1) Preparation of foamed nickel: Cut the foamed nickel (NF) into a certain size (2cm×1cm), then ultrasonically clean the foamed nickel in 2.5M HCl solution, ultrapure water, and acetone for 30 minutes, and dry it for use.

[0038] (2) Preparation of Co(OH) 2 NS@NF: Electrodeposition is carried out on the surface of NF. During the electrodeposition process, 0.1M Co(NO 3 ) 2 As an electrolyte, use a current density of 2.5mA cm at room temperature -2 Electrodeposition of Co(OH) on NF by galvanostatic electrolysis 2 Nanosheets (Co(OH) 2 NS@NF) for 15 min, and the product was dried in a drying oven at 60°C for 24 hours.

[0039] (3) Preparation of Mo-CoSe 2 NS@NF

[0040] Na with a molar ratio of 0.4:1 2 MoO 4 2H 2 O and Co(NO 3 ) 2 ·6H 2 O was dissolved in 30ml ultrapure water, stirred for 30min and then transferred to a 50ml Te...

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Abstract

The invention discloses preparation and application of a molybdenum-doped cobalt selenide foamed nickel composite electrode for electrolyzing water. The composite electrode is formed by depositing a molybdenum-doped cobalt selenide compound on a foamed nickel electrode, and the composite electrode is marked as Mo-CoSe2NS-NF. The electrode is applied to water electrolysis and has good electro-catalytic performance and stability on hydrogen evolution and oxygen evolution at the same time, the catalytic hydrogen evolution [eta]10 is 89mV, and the Tafel slope is 69mV dec-1; the catalytic oxygen evolution [eta]10 is 234 mV, the Tafel slope is 58 mV dec-1, the Tafel serves as a cathode and an anode to form an electrolytic cell, and the electrolytic voltage is only 1.56 V when the current densityin an alkaline medium reaches 10 mA cm <-2>. The catalytic active substance of the composite electrode is directly deposited on the foamed nickel electrode, the synthesis method is simple, green andenvironment-friendly, and the composite electrode has an efficient bifunctional catalytic effect, so that the designed water electrolysis tank is simple in structure and suitable for industrial large-scale application of water electrolysis.

Description

technical field [0001] The invention relates to an electrocatalytic composite electrode for water electrolysis, in particular to a preparation method and application of a molybdenum-doped cobalt selenide foamed nickel with high-efficiency electrocatalysis for electrolysis of hydrogen and oxygen evolution, and belongs to the field of electrolysis of water. Background technique [0002] With the improvement of human living standards and the improvement of social civilization, the requirements for energy supply and ecological environment quality are constantly increasing. At present, how to solve the economic and technical challenges and problems related to energy and environment in a timely manner has become an important issue facing the whole human society, including the conversion and storage of clean and renewable energy including fuel cells, metal-air batteries and electrochemical water separation devices The system has thus been greatly stimulated and developed. Among th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B11/03C25B1/04
CPCC25B1/04C25B11/031C25B11/051C25B11/057C25B11/091Y02E60/36
Inventor 张小华陈金华王诗乐聂建行
Owner HUNAN UNIV
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