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Cobalt-based sulfide nano-rod array preparation method

A nanorod array and sulfide technology, which is applied in the field of oxygen evolution catalysts, can solve the problems of limited catalyst catalytic performance, long precursor synthesis time, tail gas treatment problems, etc., and achieve good oxygen evolution stability, good self-supporting ability, method simple effect

Inactive Publication Date: 2020-02-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nickel-cobalt-based sulfide oxygen evolution catalysts reported in the literature use high-temperature sulfidation methods, which may cause tail gas treatment problems during the preparation process (J.Mater.Chem.A, 2018, 6(26), 12506 –12514)
In the cobalt-based sulfide method prepared by the same two-step method, the synthesis time of some precursors is longer, which is not conducive to the needs of actual production (Electrochimica Acta, 2018, 278, 219-225)
In addition, the cobalt-based sulfide catalyst prepared by the hydrothermal method is in the form of powder, and nafion reagent is needed to bond it to the electrode during the electrocatalysis process, which limits the catalytic performance of the catalyst.

Method used

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Experimental program
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Embodiment 1

[0022] Step 1, prepare a mixed solution of cobalt nitrate, urea and ammonium fluoride, wherein the concentrations of cobalt nitrate, urea and ammonium fluoride are 0.0475mol / L, 0.25mol / L and 0.1mol / L respectively, and transfer the mixed solution to the reaction in the kettle

[0023] Step 2, immersing the washed nickel foam into the above-mentioned mixed solution, and reacting with water at 120° C. for 12 hours;

[0024] In step 3, the nickel foam grown with the cobalt-based precursor was rinsed with water, and then transferred to a concentration of 0.007mol / L Na 2 In the S aqueous solution, react at 100° C. for 12 hours. After the reaction, wash with water and dry in vacuum to obtain a cobalt-based sulfide nanorod array.

[0025] figure 1 (a) a cobalt-based precursor with a rod-like array structure prepared by a hydrothermal method, figure 1 (b) SEM image of cobalt-based sulfide nanorod arrays obtained after hydrothermal sulfidation. It can be seen from the figure that af...

Embodiment 2

[0027] This embodiment is basically the same as Embodiment 1, except that the concentration of cobalt nitrate is 0.07 mol / L, the concentration of ammonium fluoride is 0.12 mol / L, and other conditions remain the same.

Embodiment 3

[0029] This embodiment is basically the same as Embodiment 1, except that the concentration of cobalt nitrate is 0.02 mol / L, the concentration of urea is 0.28 mol / L, and other conditions remain the same.

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Abstract

The invention discloses a cobalt-based sulfide nano-rod array preparation method, which comprises: self-growing a cobalt-based precursor having a nano-rod array structure on foamed nickel through a simple hydrothermal method, adding the precursor into a sodium sulfide solution, and preparing the cobalt-based sulfide nano-rod array through ion exchange. According to the invention, the method is simple, the raw material cost is low, the method is suitable for industrial production, and the cobalt-based sulfide nano-rod array is effectively controlled and synthesized under mild conditions, and has good self-supporting capacity, good oxygen evolution reaction activity and good oxygen evolution stability.

Description

technical field [0001] The invention belongs to the technical field of oxygen evolution catalysts, and relates to a method for preparing a cobalt-based sulfide nanorod array. Background technique [0002] As a green and non-toxic clean energy, hydrogen energy has attracted widespread attention due to its advantages of wide sources, environmental friendliness and high calorific value. Hydrogen production by electrolysis of water is regarded as a hydrogen production technology with great potential due to the advantages of high hydrogen production purity, simple preparation process, and wide source of raw materials. However, as a half-reaction of water electrolysis, the oxygen evolution process at the anode involves the transfer of 4 electrons, and its poor oxygen evolution kinetics and high oxygen evolution overpotential lead to increased energy consumption and reduced water splitting efficiency. Therefore, when other conditions remain unchanged, the key to improving hydrogen...

Claims

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Application Information

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IPC IPC(8): B01J27/043C25B1/04C25B11/06
CPCB01J27/043C25B1/04C25B11/04Y02E60/36
Inventor 姜炜郭小雪吴方王宁郝嘎子胡玉冰谈玲华
Owner NANJING UNIV OF SCI & TECH