An electrocatalytic total water splitting cozn-ldhs-zif@c composite structure material and its preparation method and application

A technology of electrocatalytic materials and composite structures, which is applied in the field of inorganic nanocatalytic materials, can solve problems such as low electrocatalytic efficiency, easy to be poisoned, and high price, and achieve improved electrocatalytic activity and stability, improved migration efficiency, and preparation methods simple effect

Inactive Publication Date: 2021-11-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited reserves on the earth, high prices, and easy to be poisoned, these precious metals have hindered the further development and application of fuel cells and electrochemical energy storage to a certain extent.
Moreover, in the prior art, the valence state of metal elements in Layered Double Hydroxides (LDHs) is single, and electron transfer cannot be efficiently performed in the electrocatalytic process, and the electrocatalytic efficiency is low.

Method used

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  • An electrocatalytic total water splitting cozn-ldhs-zif@c composite structure material and its preparation method and application
  • An electrocatalytic total water splitting cozn-ldhs-zif@c composite structure material and its preparation method and application
  • An electrocatalytic total water splitting cozn-ldhs-zif@c composite structure material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: In situ preparation of CoZn-LDHs on nickel foam

[0039] 0.5 mol / L Co(NO 3 ) 2 •6H 2 O aqueous solution was added to 0.5 mol / L Zn(NO 3 ) 2 •6H 2 O aqueous solution, stir rapidly until completely dissolved, then add urea, its molar concentration is 0.04 mol / L, stir while adding, continue to stir for 2 hours after completion, then add 3×3 cm 2 Place nickel foam horizontally at the bottom of the reactor, add the above solution, react at 100-120°C for 24 hours, cool to room temperature, wash with deionized water and absolute ethanol, and dry at 60°C for 12 hours to obtain a pink powder evenly covered in Nickel foam surface;

[0040] Micronano thin film material CoZn-LDHs on foamed nickel in embodiment 1, electron micrograph is as figure 1 -As shown in CoZn-LDHs, CoZn-LDHs has a multi-level spherical structure, the primary structure is a sheet, and the thickness is 10-20nm, and the secondary spherical structure is 10-15μm in size. figure 2 The X-ray diffr...

Embodiment 2

[0041] Embodiment 2: Preparation of CoZn-LDHs-ZIF

[0042] Taking step 1) synthesized CoZn-LDHs on the surface of nickel foam, the size is 1×1 cm 2 , placed in 50ml of methanol solution dissolved with 0.1g of dimethylimidazole, soaked for 48 hours, after the reaction, rinsed with demethanol and absolute ethanol in turn, and dried in vacuum at 60°C for 12h to obtain CoZn-LDHs surface loaded ZIF Precursors of particulate electrocatalytic materials.

[0043] The particle size of the sample ZIF-67,8 obtained in Example 2 is 200-500 nm, and the shape is irregular nano-particles. figure 2 The X-ray diffraction pattern of this sample of CoZn-LDHs. image 3 It is the CoZn-LDHs-ZIF specific surface area test chart, from which the BET area of ​​this sample is calculated to be 1125.1 m 2 / g. Figure 5 It is the HER and OER electrocatalytic performance test chart of the sample. Figure 6 It is the electrocatalytic water splitting test of this sample.

Embodiment 3

[0044] Example 3: Take the ZIF-loaded CoZn-LDHs sample in step 2), and place it in a tube furnace for calcination. The gas source used is high-purity argon, and the flow rate is 50 ml / min. The calcination temperature is 200 degrees centigrade, the heating time is 5 degrees centigrade per minute, the calcination time is 3 hours, and naturally cooled to room temperature.

[0045] The micro-nano powder material CoZn-LDHs-ZIF@C-200 prepared in Example 3, the electron microscope photo is as follows Picture 1-1 As shown, CoZn-LDHs-ZIF@C-200 still maintains a multi-level spherical structure, and a smooth and rough ZIF structure exists. figure 2 The X-ray diffraction pattern of this sample in CoZn-LDHs-ZIF@C-200, image 3 is the CoZn-LDHs-ZIF specific surface area test chart, from which the BET area of ​​this sample is calculated to be 915.8 m 2 / g. Figure 5 It is the HER and OER electrocatalytic performance test chart of the sample. Figure 6 It is the electrocatalytic water s...

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Abstract

The invention belongs to the field of inorganic nano-catalytic materials, and in particular relates to an electrocatalytic total water splitting CoZn-LDHs-ZIF@C composite structure material and its preparation method and application. The CoZn-LDHs-ZIF@C composite structural material prepared by the present invention has a multi-level structure morphology, wherein CoZn-LDHs is a lamellar structure, and the ZIF composite is a granular particle with a relatively uniform size. The specific surface area of ​​the composite material after low-temperature heat treatment 1125.1‑193.0 m 2 / g. Samples prepared by the present invention CoZn-LDHs-ZIF@C-200, CoZn-LDHs-ZIF@C-250, CoZn-LDHs-ZIF@C-300, CoZn-LDHs-ZIF@C-350, CoZn-LDHs-ZIF @C‑400 exhibits excellent electrocatalytic hydrogen evolution and oxygen evolution performance in alkaline electrolyte, as well as full water splitting performance; it has the advantages of simple method, mild reaction conditions, convenient operation and low energy consumption.

Description

technical field [0001] The invention belongs to the field of inorganic nano catalytic materials, and in particular relates to an electrocatalytic total water splitting CoZn-LDHs-ZIF@C composite structural material, a preparation method and an application thereof. Background technique [0002] With the progress of human society, the wide application of fossil energy has greatly promoted it, but also caused serious environmental pollution and other adverse consequences. In order to achieve the sustainable development of modern society, people's demand for renewable green energy is becoming more and more urgent, so it is very necessary to find and develop renewable green energy materials. We know that water is a huge reserve on the earth, and it is a renewable clean resource, which has been widely used in various aspects of life and production. Total water splitting is a promising chemical energy storage method. High-efficiency catalysts can improve the reaction efficiency of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80C25B11/091C25B1/04
CPCB01J23/007B01J23/80B01J35/0033C25B1/04C25B11/04Y02E60/36
Inventor 王刚马谦王俊鹏车全德杨萍
Owner UNIV OF JINAN
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