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Bifunctional oxidation electrocatalyst and preparation method thereof

An electro-oxidation and dual-function technology, applied in the field of electrochemistry, can solve problems such as inability to fully exert the metal activity, and achieve the effect of ensuring stability

Active Publication Date: 2020-06-19
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem with the stability of the catalyst, and the structure of the catalyst is granular, which cannot give full play to the full activity of the metal.

Method used

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  • Bifunctional oxidation electrocatalyst and preparation method thereof
  • Bifunctional oxidation electrocatalyst and preparation method thereof
  • Bifunctional oxidation electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 CoNiO x Synthesis of @C / G-NSs

[0033] (1) Take a clean beaker, pour 75mL of methanol; wash and dry the medicine spoon with deionized water and ethanol, take 7.96g of cobalt nitrate hexahydrate 0.027 with an electronic balance, add it into the beaker, stir to dissolve, and weigh with an electronic balance 3.88g nickel nitrate hexahydrate was added into a beaker for dissolution to obtain solution I. Take another clean beaker and pour 75mL of methanol into it; wash and dry the spatula with deionized water and ethanol, take 6.16g of dimethylimidazole with an electronic balance, add it into the beaker and stir to dissolve to obtain solution II. Then, solution II was slowly added to solution I under stirring to obtain gray-purple mixed solution III;

[0034] (2) Put solution III in an oven and dry it at 80°C for 48 hours to obtain gray-purple precursor crystals;

[0035] (3) Take three 2g precursor crystals, put them into a porcelain boat, and then put them into...

Embodiment 2

[0036] Example 2 CoNiO x Composition and structure of @C / G-NSs

[0037] figure 1 a-b are CoNiO photographed by scanning electron microscope x Microscopic topography of @C / G-NSs, showing CoNiO x @C / G-NSs graphene-like three-dimensional fluffy and hierarchical porous nanostructure provides a high-speed channel for mass and electron transport in the process of oxygen reduction reaction and oxygen evolution reaction, with higher conductivity and better material transport ability. figure 1 c-d are CoNiO taken by transmission electron microscope x @C / G - NSs diagram, from figure 1 b-c It can be clearly seen that a large number of cobalt nickel oxide nanoparticles with a diameter of 30-50nm are distributed on the graphene-like nanoflakes, and smaller and more uniform nanoparticles are beneficial to improve the catalytic activity. figure 1 d-e show that the thickness of cobalt-nickel oxide nanoparticles coated with carbon shells is about 4 nm, and in CoNiO x In @C / G-NSs, nanopa...

Embodiment 3

[0039] Example 3 CoNiO at different pyrolysis temperatures x Oxygen evolution reaction and oxygen reduction reaction catalytic performance of @C / G-NSs

[0040] The test method is as follows: all electrochemical data are tested using CHI760E electrochemical workstation; at room temperature, three electrodes are tested in 0.1 M KOH solution; the working electrode is a rotating ring disk electrode, and the reference electrode is saturated Hg(l) | Hg 2 Cl 2 (saturated KCl solution) electrode; the counter electrode is a platinum wire.

[0041] Dissolve 5 mg of the catalyst in 1 mL of absolute ethanol, and drop 10 uL of the catalyst solution on the surface of the working electrode for electrochemical testing.

[0042] All potentials involved in this experiment are referenced to the reversible hydrogen electrode (RHE), calculated as E(RHE) = E(Hg(l)|Hg 2 Cl 2 , saturated KCl solution) + pH*0.059V + 0.241V. Hg(l) | Hg compared to RHE 2 Cl 2 (saturated KCl solution) The referen...

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Abstract

The invention provides a preparation method of a bifunctional oxidation electrocatalyst. A graphene-like carbon nanosheet bifunctional catalyst in which cobalt-nickel bimetal oxide nanoparticles are coated with a carbon shell is controllably synthesized through a simple one-step pyrolysis method. The graphene-like sheet nano-layer and the graphitized carbon shell provide an electron transmission channel for the cobalt-nickel oxide nano-particles, so that the electron transmission resistance in the reaction process is reduced. Mesopores (about 3nm) distributed in the three-dimensional graphene-like nanosheet layer and the carbon shell provide a channel for substance exchange between the electrolyte solution and the nanoparticles, and the substance transmission capacity of the cobalt-nickeloxide is enhanced. The graphite carbon shell reduces the Ostwald ripening effect, so that the cobalt-nickel oxide is more stable in bifunctional catalysis. The synergistic effect of the cobalt-nickeloxide nanoparticles with the diameter of 30-50 nm and the nitrogen-doped graphitized carbon shell, which are uniformly distributed on the surface of the sheet layer, brings more excellent oxygen reduction activity (the half-slope potential is 0.78 V), oxygen evolution reaction activity (the initial potential is 1.26 V) and methanol tolerance than 20% Pt / C.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a graphene-like carbon nanosheet catalyst with carbon shell-coated cobalt-nickel double metal oxide nanoparticles. Background technique [0002] With the exhaustion of non-renewable energy sources, the development of new energy sources has become an important step for human beings to climb the peak of civilization, and the development of dual-functional electrochemical catalysts is an important part of it. As an important catalyst for catalyzing new energy reactions, bifunctional catalysts have become a necessity for the production, conversion, and storage of new energy, such as electrode surface catalysts for fuel cells, catalysts for electrolyzing water to generate oxygen, and electrode surface catalysts for metal-air batteries. [0003] The oxygen reduction reaction describes the reaction process in which oxygen molecules receive electrons to form new subs...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M8/1011B82Y30/00
CPCB82Y30/00H01M4/9016H01M4/9083H01M8/1011Y02E60/50
Inventor 赵振路沙骑骑马孔硕逯一中
Owner UNIV OF JINAN
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