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Single-cell-thickness nano porous cobalt oxide nanosheet array electrocatalytic material

A technology of cobalt trioxide nanometer and electrocatalytic materials, which is applied in the direction of nanotechnology, nanotechnology, nanostructure manufacturing, etc. It can solve the problems affecting popularization and application, poor HER performance, etc., and achieve the effects of environmental friendliness, convenient operation and improved conversion rate

Inactive Publication Date: 2016-10-12
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these OER catalysts usually exhibit poor HER performance, which hinders their further application.

Method used

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  • Single-cell-thickness nano porous cobalt oxide nanosheet array electrocatalytic material
  • Single-cell-thickness nano porous cobalt oxide nanosheet array electrocatalytic material
  • Single-cell-thickness nano porous cobalt oxide nanosheet array electrocatalytic material

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Experimental program
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Effect test

Embodiment 1

[0037] A nanoporous cobalt tetraoxide nanosheet array electrocatalytic material with a unit cell thickness, which is a zinc-doped cobalt tetraoxide primary nanosheet array grown on a conductive substrate perpendicular to the substrate, each of the primary nanosheets is obtained with a unit cell thickness Nanoporous cobalt tetroxide nanosheets, the conductive substrate is a titanium sheet, the doped metal is zinc, and the molar ratio of the doped metal to cobalt is 0.5:1; the thickness of the metal-doped cobalt trioxide ultrathin nanosheets is 0.84nm, Has a nanoporous structure.

[0038] The preparation method of the nanoporous cobalt tetraoxide nanosheet array electrocatalytic material with unit cell thickness comprises the following steps:

[0039] 1) Prepare the first aqueous solution of hydrochloric acid with a concentration of 1 mol / liter, put the conductive substrate into the hydrochloric acid solution and ultrasonically clean it for 5 minutes, then put the conductive sub...

Embodiment 2

[0050] A nanoporous cobalt tetraoxide nanosheet array electrocatalytic material with different thicknesses is a zinc-doped cobalt tetraoxide primary nanosheet array grown perpendicular to the substrate on a conductive substrate, and each primary nanosheet is obtained with different thicknesses. In the nanoporous cobalt trioxide nanosheet, the conductive substrate is a titanium sheet, the doped metal is zinc, and the molar ratio of zinc to cobalt is 0.5:1.

[0051] The preparation method of the electrocatalytic material is basically the same as that of Example 1, except that the soaking time in step 3 in the sodium hydroxide alkali solution containing sodium borohydride is changed. The immersion times were 1 h, 1.5 h, 2.5 h, and 3 h, and the obtained materials were named NPCoO-1h-NSs, NPCoO-1.5h-NSs, NPCoO-2.5h-NSs, and CoO-3h-Ps, respectively.

[0052] Figure 7 It is the scanning electron micrograph (SEM), transmission electron micrograph (TEM) and atomic force micrograph (A...

Embodiment 3

[0055] A nanoporous cobalt tetraoxide nanosheet array electrocatalytic material with a unit cell thickness, which is a metal-doped cobalt tetraoxide primary nanosheet array grown on a conductive substrate perpendicular to the substrate, each of the primary nanosheets is obtained with a unit cell thick nanoporous cobalt trioxide nanosheets, the conductive substrate is titanium sheet, the doped metal is zinc, and the molar ratio of zinc to cobalt is 0.2:1.

[0056] The preparation method of the electrocatalytic material is basically the same as in Example 1, except that the concentration of zinc nitrate in step 2 is changed.

[0057] The preparation method of the electrocatalytic material is the same as that of Example 1. The obtained material is similar to the material obtained in Example 1 in appearance and performance.

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Abstract

A single-cell-thickness nano porous cobalt oxide nanosheet array electrocatalytic material is characterized in that a metal-doped cobalt oxide primary nanosheet array is perpendicularly grown on a conductive substrate, a porous nanosheet is obtained from each primary nanosheet, and the nanosheets are of porous structure; the material is used as an electrocatalyst for oxygen evolution reaction; the material also has excellent hydrogen evolution performance and may function as a bifunctional catalyst for an alkaline full-decomposition water system. The invention has the advantages that the material can effectively reduce overpotential and peaking potential of oxygen evolution reaction, increase conversion rate of single cobalt atoms and operate stably and continuously in a strong alkali environment; the material has excellent oxygen evolution reaction performance and can be applied as an anode and cathode of a full-decomposition water system, effectively reducing trough voltage; the material is simple to prepare, convenient to operate, low in cost and environment-friendly, and new idea and strategy are provided for the guide design and performance optimization of the bifunctional catalyst for the full-decomposition water system.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy conversion, and in particular relates to an electrocatalytic material with unit cell thickness nanoporous tricobalt tetroxide nanosheet array. Background technique [0002] Hydrogen production by fully splitting water is an effective solution to energy shortage and environmental pollution. In this field, the design and acquisition of high-performance electrocatalytic electrode materials for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has always been a research topic. Our goal, however, is limited by the slow four-electron transfer process of oxygen production in water oxidation, making the oxygen evolution reaction the rate-limiting step that restricts the efficiency of hydrogen production. Although noble metal catalysts have high surface activity, they cannot meet the actual demand due to their high cost and low reserves. Therefore, the development of OER...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90B82B3/00B82Y30/00B82Y40/00
CPCB82B3/0014B82Y30/00B82Y40/00H01M4/9016Y02E60/50
Inventor 刘熙俊罗俊
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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