Ultrathin nanosheet array electro-catalytic material with nano-porous structure and oxygen vacancies

A nanosheet array and electrocatalytic material technology, applied in the field of ultra-thin nanosheet array electrocatalytic materials, can solve the problems of poor stability and low catalyst activity, achieve good stability, increase specific surface area, and improve adsorption effects

Inactive Publication Date: 2016-02-17
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these catalysts have problems such as low activity and poor stability, which limit their application.

Method used

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  • Ultrathin nanosheet array electro-catalytic material with nano-porous structure and oxygen vacancies
  • Ultrathin nanosheet array electro-catalytic material with nano-porous structure and oxygen vacancies
  • Ultrathin nanosheet array electro-catalytic material with nano-porous structure and oxygen vacancies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]An electrocatalytic material with a nanoporous structure and an oxygen vacancy ultra-thin nanosheet array, which is a metal-doped tricobalt tetroxide primary nanosheet array grown perpendicular to the substrate on a conductive substrate, and each of the primary nanosheets is obtained with Oxygen vacancies and nanoporous ultrathin 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 tetraoxide ultrathin nanosheet is 1.22nm, the nanosheet has a three-dimensional porous structure, and the nanopore diameter is 3.6nm

[0035] The preparation method of the ultrathin nanosheet array electrocatalytic material having a nanoporous structure and oxygen vacancies comprises the following steps:

[0036] 1) Prepare the first aqueous solution of hydrochloric acid with a concentration of 1 mol / liter, put the conductive substrate into the hydrochloric acid solu...

Embodiment 2

[0058] An electrocatalytic material with a nanoporous structure and an oxygen vacancy ultra-thin nanosheet array, which is a metal-doped tricobalt tetroxide primary nanosheet array grown perpendicular to the substrate on a conductive substrate, and each of the primary nanosheets is obtained with Oxygen vacancies and nanoporous ultrathin nanosheets, the conductive substrate is a titanium sheet, the doped metal is nickel, and the molar ratio of the doped metal to cobalt is 1:1; the thickness of the metal-doped cobalt tetraoxide ultrathin nanosheet is The nanosheet has a three-dimensional porous structure with a nanopore diameter of 3.9nm.

[0059] The preparation method of the electrocatalytic material is basically the same as in Example 1, except that the zinc nitrate in steps 2 and 3 is replaced with nickel nitrate.

Embodiment 3

[0061] An electrocatalytic material with a nanoporous structure and an oxygen vacancy ultra-thin nanosheet array, which is a metal-doped tricobalt tetroxide primary nanosheet array grown perpendicular to the substrate on a conductive substrate, and each of the primary nanosheets is obtained with Oxygen vacancies and nanoporous ultrathin nanosheets, the conductive substrate is nickel foam, the doped metal is zinc, and the molar ratio of doped metal to cobalt is 0.5:1; metal-doped cobalt tetraoxide ultrathin nanosheets The thickness is 1.5nm, and the nanosheet has a three-dimensional porous structure with a nanopore diameter of 5nm.

[0062] 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

The invention relates to an ultrathin nanosheet array electro-catalytic material with a nano-porous structure and oxygen vacancies. The material is a cobaltosic oxide primary nanosheet array which grows vertically on a conductive substrate and is doped with a metal; an ultrathin nanosheet with oxygen vacancies and nanopores is obtained on each primary nanosheet; the conductive substrate is a titanium sheet or a foamed nickel sheet, and the doped metal is zinc, nickel or manganese; and the thickness of each cobaltosic oxide ultrathin nanosheet doped with the metal is 1.22 nm, nanosheets are in a three-dimensional porous structure, and the nano-pore diameter is 3-6 nm. The ultrathin nanosheet array electro-catalytic material with the nano-porous structure and oxygen vacancies has the following advantages: the material can effectively reduce the overpotential and the spike potential of an oxygen evolution reaction, increase the conversion rate of a single cobalt atom and work continuously and stably in an alkali environment; the steps of a preparation method of the material are simple, the operation is convenient, the cost is low, and the material is environmental-friendly; and new ideas and strategies are provided for the function-oriented design and the performance optimization of an oxygen evolution catalyst of a water electrolysis 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 ultra-thin nanosheet arrays having a nanoporous structure and oxygen vacancies. Background technique [0002] Hydrogen production by alkaline electrolysis of water is an effective solution to energy shortage and environmental pollution. In this field, designing and obtaining high-performance electrocatalytic electrode materials for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has always been an important issue. The researchers' goal, however, is limited by the slow four-electron transfer process of water oxidation to oxygen production, making the oxygen evolution reaction the rate-limiting step that constrains 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. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/04
CPCY02E60/36
Inventor 刘熙俊罗俊丁轶
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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