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Cobalt phosphate nano-material as well as preparation method and application thereof

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

Active Publication Date: 2018-12-07
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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  • Cobalt phosphate nano-material as well as preparation method and application thereof
  • Cobalt phosphate nano-material as well as preparation method and application thereof
  • Cobalt phosphate nano-material as well as preparation method and application thereof

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 1.25 deg / 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 nano-material as well as a preparation method and application thereof. A chemical general formula of phosphate is Co3(OH)2(HPO4)2, an auxiliary preparation size of a surfactant polyvinylpyrrolidone (PVP) is the nano-material of 0.5 micrometer to 1 micrometer. A surfactant auxiliary hydrothermal method is adopted, the preparation method disclosed by the invention has the advantages of being simple, easy to operate, low in cost, and environment-friendly, and a whole reaction process does not need special equipment, industrial production is facilitated,and the quality of the finally obtained product is higher. According to the phosphate nano-material prepared by adopting the method, the advantages of high conductivity of the material, more active sites, high electrocatalytic activity and the like are realized at the same time. The preparation material is a desired oxygen evolution reaction electrocatalytic material which has wide commercializedapplication 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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IPC IPC(8): C01B25/37B01J27/185C25B1/04C25B11/06B82Y30/00
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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