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A kind of cobalt phosphate nanomaterial and its preparation method and application

A cobalt phosphate nano and nano material technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of low current density, high overpotential, poor stability, etc., and achieve stable catalytic performance, small size, and reaction. mild conditions

Active Publication Date: 2021-10-22
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to synthesize high-yield, high-quality cobalt phosphate nanomaterials to solve the problems of low current density, high overpotential, and poor stability in existing catalysts.

Method used

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  • A kind of cobalt phosphate nanomaterial and its preparation method and application
  • A kind of cobalt phosphate nanomaterial and its preparation method and application
  • A kind of cobalt phosphate nanomaterial and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 sample preparation

[0029] Mix the cobalt source, surfactant and water, stir for at least 1 hour, add phosphorus source aqueous solution after mixing, and stir for at least 2 hours to form an initial gel mixture, seal the initial gel mixture in 30 mL of Teflon-lined water Put it into a box-type resistance furnace in a thermal reaction kettle, crystallize at the crystallization temperature for a period of time, filter, wash, and dry to obtain purple flake Co 3 (OH) 2 (HPO 4 ) 2 nanomaterials. Table 1 shows the relationship between the types and ratios of raw materials in the initial gel mixture, crystallization temperature, crystallization time, and sample numbers.

[0030] Table 1 Relationship between sample synthesis conditions and sample numbers

[0031]

[0032]

Embodiment 2

[0033] The structural analysis of embodiment 2 sample

[0034] The powder X-ray diffraction method was used to analyze the structure of samples 1# to 10#.

[0035] Powder X-ray diffraction was carried out on the Miniflex II X-ray powder diffractometer of Japan RIGAKU Company. The test conditions were fixed target monochromatic light source Cu-Kα, wavelength The voltage and current are 30kV / 15A, the slits DivSlit / RecSlit / SctSlit are 1.25deg / 0.3mm / 1.25deg respectively, the scanning range is 5-50°, and the scanning step is 0.02°.

[0036] The results show that samples 1#~10# have the same chemical structural formula and crystal structure, and the chemical formula is Co 3 (OH) 2 (HPO 4 ) 2 . Take sample 1# as a typical representative, such as figure 1 shown with figure 2 In the spectrum obtained by X-ray diffraction test after the middle sample 1# is ground into powder, the peak position and peak intensity are consistent. It shows that the obtained samples are of high ...

Embodiment 3

[0037] Morphological characterization of embodiment 3 sample

[0038] The morphology of sample 1# was characterized by scanning electron microscope and transmission electron microscope.

[0039] Scanning electron microscopy and transmission electron microscopy were carried out on a Hitachi S4800 scanning electron microscope and a JEOL JEM-2100F transmission electron microscope, respectively.

[0040] The result shows, as figure 2 SEM images and image 3 As shown in the transmission electron microscope, sample 1# has a good nanosheet shape, and the material has a uniform shape, good dispersion, and a size of 0.5-1 μm.

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Abstract

The invention discloses a cobalt phosphate nanometer material and a preparation method and application thereof. The chemical formula of this phosphate is Co 3 (OH) 2 (HPO 4 ) 2 , with the aid of the surfactant polyvinylpyrrolidone (PVP) to prepare nanomaterials with a size of 0.5-1 μm. The invention adopts the surfactant-assisted hydrothermal method, and the preparation method is simple, easy to operate, low in cost, and environmentally friendly. The whole reaction process does not need special equipment, which is beneficial to industrial production, and the final product quality is high. The phosphate nanomaterial prepared by the method can simultaneously achieve the advantages of high electrical conductivity, many active sites, and high electrocatalytic activity. The material prepared by the invention is an ideal electrocatalytic material for oxygen evolution reaction with wide commercial application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of electrochemical catalysts, and relates to a cobalt phosphate nanometer material and its preparation method and application. Background technique [0002] Electrochemical water splitting to generate hydrogen and oxygen has attracted much attention due to the growing global demand for sustainable energy. The water splitting reaction consists of two half-reactions: the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). However, due to the complex four-electron transfer process of the oxygen evolution half reaction, the kinetic process is slower, which has been the main factor limiting the efficiency of the water splitting process. [0003] So far, compounds containing platinum, ruthenium and iridium noble metal elements have a good catalytic effect of oxygen evolution reaction. However, due to the small reserves of these precious metals on the earth, the price is relatively exp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185
CPCC25B1/04C25B11/04B82Y30/00C01B25/37B01J27/1853C01P2004/61C01P2004/04C01P2004/03C01P2002/72B01J35/33Y02E60/36
Inventor 宋俊玲鲁文秀
Owner JIANGNAN UNIV
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