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Preparation method and application of nickel hydroxide/nickel electrode

A nickel hydroxide and nickel electrode technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve problems such as unsatisfactory catalytic activity, and achieve the effects of excellent catalytic performance, short preparation time and cheap raw materials

Inactive Publication Date: 2021-06-22
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there have been some reports on the preparation of nickel hydroxide / nickel oxide self-supporting electrodes for OER by electrodeposition, most of them are thick nanosheets or large nanoparticles, and the catalytic activity is not ideal.

Method used

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  • Preparation method and application of nickel hydroxide/nickel electrode
  • Preparation method and application of nickel hydroxide/nickel electrode
  • Preparation method and application of nickel hydroxide/nickel electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: α-Ni(OH) 2 Preparation of / NF self-supporting electrodes

[0033] Nickel foam (NF, thickness: 1.7mm) was ultrasonically cleaned in ethanol, 3.0M hydrochloric acid solution and ultrapure water for 10 minutes; then, the prepared 0.2M Ni(NO 3 ) 2 . 6H 2Pour the O aqueous solution into the electrolytic cell; then, insert the cleaned NF working electrode (immersion area of ​​1cm×3cm), Pt counter electrode and Ag / AgCl reference electrode into the above electrolyte; finally, connect the electrochemical workstation, α-Ni(OH) can be prepared by deposition for 300s at the cathodic deposition potential of -2.0V vs Ag / AgCl 2 / NF self-supporting electrodes. The X-ray diffraction pattern of the product is shown in figure 1 ; Scanning Electron Microscopy, see Figure 12 ; Atomic force microscope image see image 3 ; transmission electron microscope image see Figure 4 .

Embodiment 2

[0034] Embodiment 2: the α-Ni(OH) that embodiment 1 gains 2 / NF electrocatalytic OER performance test

[0035] The α-Ni(OH) of embodiment 1 gained 2 The electrocatalytic OER performance test of / NF was carried out on a CHI760E electrochemical workstation. The electrolyte is 1.0M KOH aqueous solution. Using α-Ni(OH) 2 / NF, Ag / AgCl, and Pt plates were used as working, reference, and counter electrodes, respectively. Figure 5 The linear sweep voltammetry curve shown is obtained at a sweep rate of 1.0mV / s, and it can be seen in the figure that α-Ni(OH) 2 / NF driven 100 and 250mA cm -2 The required overpotentials for the current densities are 240 and 290 mV, respectively. Figure 6 The Tafel plot shown is from Figure 5 Calculated, it can be seen that α-Ni(OH) 2 The Tafel slope of / NF is 108mV·dec -1 . Figure 7 The potential diagram required for the test under different high current densities shown is the α-Ni(OH) 2 / NF drive 500-1000mA cm -2 The current density is fi...

Embodiment 3

[0036] Embodiment 3: the α-Ni(OH) that embodiment 1 gains 2 / NF electrochemical specific surface area test

[0037] To determine the electrochemical surface area (ECSA), cyclic voltammetry (CV) measurements were used to explore the electrochemical double layer capacitance (C dl ). CV in non-Faraday range (0.93-1.03V vs RHE) with sweep rates of 60, 80, 100, 120, 140 and 160mV s -1 . A linearity plot was obtained by plotting current density versus scan rate at 0.98V vs RHE. C dl is half the slope of the linear graph and is used to represent ECSA. The electrochemical specific surface area diagram is shown in Figure 9 .

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Abstract

The invention discloses a preparation method and application of a nickel hydroxide / nickel electrode. An ultrathin nickel hydroxide (alpha-Ni(OH)2) nanosheet with the thickness of 3.0 nm is directly grown on foamed nickel (NF) through electro-deposition, and an alpha-Ni(OH)2 / NF self-supporting electrode is constructed. The electrode shows excellent OER catalytic performance, the current density of 10 mA*cm<-2> and the current density of 100 mA*cm<-2> can be driven only by low overpotentials of 192 mV and 240 mV in 1.0 M KOH electrolyte solution, and the catalytic performance exceeds that of nickel hydroxide / oxide and reference RuO2 in the prior art. In addition, the alpha-Ni(OH)2 / NF self-supporting electrode can drive a large current density of 500-1000 mA*cm<-2> only with a low overpotential, and has a potential industrial application value.

Description

technical field [0001] The invention relates to the field of electrochemical synthesis and the field of energy catalysis, in particular to a preparation method of nickel hydroxide / nickel electrode and its application in electrocatalytic oxygen evolution reaction. Background technique [0002] The depletion of fossil fuels and growing environmental problems force people to seek sustainable and clean energy. Hydrogen (H 2 ) has the advantages of high combustion value and no pollution, and is an ideal renewable clean energy. Hydrogen production by electrolysis of water is not only simple and convenient, but also can obtain high-purity hydrogen, which is a promising technology for converting renewable energy into hydrogen energy. Water electrolysis consists of two key half-reactions: oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Among them, OER involves complex multi-proton coupled electron transfer process, resulting in slow oxygen (O 2 ) release ki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04C25D3/12C25D9/04C25D7/00
CPCC25B1/04C25D3/12C25D7/00C25D9/04Y02E60/36
Inventor 曹黎明何纯挺朱轩逸孙榕智曹清财
Owner JIANGXI NORMAL UNIV
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