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A nickel-based hierarchical structure integrated electrode for electrolyzing water and its preparation method

A hierarchical structure, electrolysis of water technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problems of low activity, low output, high consumption, etc., achieve the effect of multiple active sites, shorten the transmission length, and improve the utilization rate

Active Publication Date: 2022-03-11
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of high consumption, low output and low activity of traditional support electrode materials (nickel mesh) used for electrolysis of water

Method used

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  • A nickel-based hierarchical structure integrated electrode for electrolyzing water and its preparation method
  • A nickel-based hierarchical structure integrated electrode for electrolyzing water and its preparation method
  • A nickel-based hierarchical structure integrated electrode for electrolyzing water and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of rough surface nickel mesh (E-NM)

[0027] Will measure 1.5 x 1cm 2 The commercial nickel mesh (NM) was put into 3M HCl electrolyte solution, and a two-electrode system was adopted, with NM as the positive electrode and graphite rod as the negative electrode, and the chronoamperometry it was used for electrochemical etching, and the set voltage was 1V. Properties of the obtained E-NM electrodes under etching time. Specifically, the electrochemical etching time is 30-600s, and the performance is optimal when the electrochemical etching time is 100s.

[0028] figure 2 a and 2b are SEM images of NM before and after electrochemical etching. It can be seen from the figure that the surface of the nickel mesh fiber changes from smooth to rough after electrochemical etching, which is easy to nucleate during the subsequent growth of nickel nanowires.

[0029] 2. Preparation of nickel nanowire arrays (Ni NWs / E-NM)

[0030] (1), configure solution A and solut...

Embodiment 2

[0037] 1. Preparation of rough surface nickel mesh (E-NM)

[0038] Specifically, the steps are the same as those in Example 1

[0039] 2. Preparation of nickel nanowire arrays (Ni NWs / E-NM)

[0040] Specifically, the steps are the same as those in Example 1

[0041] 3. Preparation of electrode materials (NiCo / Ni NWs / E-NM)

[0042] Using the prepared Ni NWs / E-NM as the precursor, a three-electrode electrochemical cell was used, with Ni NWs / E-NM as the working electrode, platinum sheet as the counter electrode, and Ag / AgCl as the reference electrode, containing 0.25M NiSO 4 ·6H 2 O, 0.25M CoSO 4 ·6H 2 O, 0.2MNa 2 SO 4 and 0.5M H 3 BO 3 The solution is an electrolyte, and under the condition of a constant voltage of -1V, the electrodeposition time is adjusted to prepare the best sample NiCo / Ni NWs / E-NM.

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Abstract

The invention discloses a nickel-based hierarchical structure integrated electrode for electrolyzing water and a preparation method thereof. Firstly, a commercial nickel mesh is placed in an HCl solution, and electrochemically etched to obtain an E-NM electrode with uneven surface; Then the obtained electrode material E-NM is placed in the water tank, the electromagnet is placed on the bottom of the water tank, an electromagnetic field perpendicular to the E-NM is applied, and a certain concentration of nickel-based metal inorganic salt solution and hydrazine hydrate solution are mixed in the water tank, Reaction at a certain temperature, after washing and drying, the Ni NWs / E-NM electrode is obtained; finally, the obtained electrode NiNWs / E-NM is placed in a certain concentration of nickel-based metal inorganic salt electrolyte solution for electrochemical deposition. Ni NWs / E‑NM electrodes are electrochemically deposited on the surface of nickel metal nanoparticles, and after washing and drying, Ni / Ni NWs / E‑NM electrodes with high active area are obtained. Depositing Ni nanoparticles on ultra-long nanowire arrays forms a well-defined hierarchical structure "long nanoparticles on nanowires", endowing the electrode with high electrocatalytic performance.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production and energy storage by electrolysis of water, and in particular relates to a nickel-based hierarchical structure integrated electrode for electrolysis of water and a preparation method thereof. Background technique [0002] The increasing energy demand and the inevitable depletion of fossil fuels have prompted people to seek environmentally friendly, renewable and clean alternative energy sources and seek new ways to extract energy efficiently. Hydrogen has a high energy density (143MJ kg -1 ) and the only combustion product H 2 O, is a promising fuel for sustainable energy development. Water electrolysis is a commercially-established technology for producing clean energy with zero carbon emissions. While an electrolyzer coupled to a photovoltaic module for direct solar hydrogen production should be an excellent energy conversion system, large-scale production of high-purity hydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B11/075C25B11/031B82Y40/00C25F3/02C25D3/12C23C18/34
CPCC25B1/04B82Y40/00C25F3/02C25D3/12C23C18/34Y02E60/36
Inventor 王荣方高登何王辉王许云
Owner QINGDAO UNIV OF SCI & TECH
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