CN-115632133-B - Cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell and preparation method thereof

CN115632133BCN 115632133 BCN115632133 BCN 115632133BCN-115632133-B

Abstract

The invention discloses a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell and a preparation method thereof, wherein the method comprises the steps of preparing a cobalt/carbon cloth catalyst by using cobalt salt, a reducing agent and carbon cloth in an alkaline environment; and performing elution treatment on the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after washing the decarburized cloth to obtain the cobalt/cobalt oxide catalyst. The method prepares the cobalt/cobalt oxide catalyst by a two-step method, thereby realizing the technical effect of improving the hydrogen preparation efficiency.

Inventors

CUI PENG
WEN LONG
WU HAIRONG
OU TENGJIAO
CAO GUIJUN

Assignees

深圳深科鹏沃科技有限公司

Dates

Publication Date: 20260512
Application Date: 20221028

Claims (5)

1. A method for preparing a cobalt/cobalt oxide catalyst for a fuel cell hydrogen fuel, the method comprising the steps of: Preparing a cobalt/carbon cloth catalyst by using cobalt salt, a reducing agent and carbon cloth in an alkaline environment; The cobalt/carbon cloth catalyst is locally oxidized into cobalt/cobalt oxide/carbon cloth catalyst at high temperature; Eluting the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after washing the decarburized cloth to obtain the cobalt/cobalt oxide catalyst; the step of preparing the cobalt/carbon cloth catalyst by using cobalt salt, a reducing agent and carbon cloth in an alkaline environment comprises the following steps: placing cobalt salt, sodium hydroxide, a reducing agent and carbon cloth in ultrapure water, and continuously stirring at normal temperature to obtain a cobalt/carbon cloth catalyst; Carrying out ultrasonic oscillation treatment on the cobalt/carbon cloth catalyst to remove sodium hydroxide impurities; Placing the cobalt/carbon cloth catalyst with sodium hydroxide impurities removed in a vacuum furnace, and drying at 50 ℃ for 2 hours; The step of locally oxidizing the cobalt/carbon cloth catalyst to cobalt/cobalt oxide/carbon cloth catalyst at high temperature comprises the following steps: placing the cobalt/carbon cloth catalyst in a tubular furnace, and heating from room temperature at a heating rate of 5 ℃ per minute; Heat preservation is carried out for 4 hours after the temperature rises to 500 ℃ to obtain a cobalt/cobalt oxide/carbon cloth catalyst; The step of eluting the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after washing the decarburized cloth to obtain the cobalt/cobalt oxide catalyst comprises the following steps: placing the cobalt/cobalt oxide/carbon cloth catalyst in an ultrasonic oscillator for continuous oscillation for 2 hours, and filtering out cobalt/cobalt oxide solution; And (3) placing the cobalt/cobalt oxide solution in a vacuum furnace, and drying at 50 ℃ for 3-5 hours to prepare the cobalt/cobalt oxide catalyst.
2. The method for preparing a cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell according to claim 1, wherein the cobalt salt is cobalt chloride or cobalt acetate.
3. The method for preparing a cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell according to claim 1, wherein the reducing agent is sodium borohydride or lithium dimethylaminoborohydride.
4. The method for preparing a cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell according to claim 1, wherein the carbon cloth has a size of 2cm x 2cm.
5. The method for preparing a cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell according to any one of claims 1 to 4, wherein the ratio of the amounts of the cobalt salt and the reducing agent is 1:1 to 1.5:1.

Description

Cobalt/cobalt oxide catalyst for hydrogen fuel of fuel cell and preparation method thereof Technical Field The invention relates to the technical field of catalysts, in particular to a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell and a preparation method thereof. Background Proton exchange membrane fuel cells (PEMFCs, proton Exchange Membrane Fuel Cell) are a new type of device capable of directly converting chemical energy into electrical energy. The proton exchange membrane battery has no internal energy consumption of rotating parts, does not undergo combustion, and has high energy conversion efficiency because the energy conversion efficiency is not limited by the Carnot cycle. And the proton exchange membrane battery adopts clean energy, such as hydrogen fuel, has no harm to the environment and has high environmental protection. The proton exchange membrane battery also has the characteristics of mild working condition, small volume, light weight, safety and durability, and is widely used as a mobile power supply, which is also an ideal power supply. At present, the preparation of hydrogen fuel for proton exchange membrane fuel cells is increasingly receiving attention from various countries. The hydrogen fuel has rich sources, and can prepare hydrogen by utilizing the water electrolysis hydrogen production technology. The hydrogen production process is mainly realized by two steps of adsorption and desorption, but most catalysts are biased to one side at present, so that the efficient adsorption and desorption hydrogen production is difficult to realize. Disclosure of Invention The invention mainly aims to provide a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell and a preparation method thereof, and aims to solve the problem of low adsorption and desorption efficiency in the hydrogen production process. To achieve the above object, the present invention provides a method for preparing a cobalt/cobalt oxide catalyst for hydrogen fuel of a fuel cell, the method comprising: Preparing a cobalt/carbon cloth catalyst by using cobalt salt, a reducing agent and carbon cloth in an alkaline environment; The cobalt/carbon cloth catalyst is locally oxidized into cobalt/cobalt oxide/carbon cloth catalyst at high temperature; And (3) performing elution treatment on the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after washing the decarburized cloth to obtain the cobalt/cobalt oxide catalyst. Optionally, the step of preparing the cobalt/carbon cloth catalyst using cobalt salt, a reducing agent and carbon cloth in an alkaline environment includes: placing cobalt salt, sodium hydroxide, a reducing agent and carbon cloth in ultrapure water, and continuously stirring at normal temperature to obtain a cobalt/carbon cloth catalyst; Carrying out ultrasonic oscillation treatment on the cobalt/carbon cloth catalyst to remove sodium hydroxide impurities; And (3) placing the cobalt/carbon cloth catalyst with the sodium hydroxide impurities removed in a vacuum furnace for drying treatment for 2 hours at 50 ℃. Optionally, the step of locally oxidizing the cobalt/carbon cloth catalyst to cobalt/cobalt oxide/carbon cloth catalyst at a high temperature includes: placing the cobalt/carbon cloth catalyst in a tubular furnace, and heating from room temperature at a heating rate of 5 ℃ per minute; And (3) after the temperature rises to 500 ℃, preserving the heat for 4 hours to obtain the cobalt/cobalt oxide/carbon cloth catalyst. Optionally, the step of eluting the cobalt/cobalt oxide/carbon cloth catalyst, and drying the solution after washing the decarbonized cloth to obtain the cobalt/cobalt oxide catalyst comprises the following steps: placing the cobalt/cobalt oxide/carbon cloth catalyst in an ultrasonic oscillator for continuous oscillation for 2 hours, and filtering out cobalt/cobalt oxide solution; And (3) placing the cobalt/cobalt oxide solution in a vacuum furnace, and drying at 50 ℃ for 3-5 hours to prepare the cobalt/cobalt oxide catalyst. Optionally, the cobalt salt is cobalt chloride or cobalt acetate. Optionally, the reducing agent is sodium borohydride or lithium dimethylaminoborohydride. Alternatively, the carbon cloth has dimensions of 2cm×2cm. Optionally, the ratio of cobalt salt to reducing agent is 1:1 to 1.5:1. In addition, in order to achieve the above object, the present invention also provides a cobalt/cobalt oxide catalyst for a hydrogen fuel of a fuel cell, which is prepared using the method for preparing a cobalt/cobalt oxide catalyst for a hydrogen fuel of a fuel cell as described above. Optionally, the cobalt/cobalt oxide catalyst has a cobalt to cobalt oxide ratio of 1:1. According to the cobalt/cobalt oxide catalyst for the hydrogen fuel of the fuel cell and the preparation method thereof, the two-step method is used for preparing the cobalt/cobalt oxide catalyst, the reducing agent is used for reducing cobalt salt to prepare the cobalt catalyst, and