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Bifunctional graphene oxide loaded cobalt nano particle composite material with core-shell structure

A composite material and shell structure technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as poor chemical and thermal stability, and achieve good morphology , high catalytic performance and stability, uniform dispersion effect

Active Publication Date: 2020-07-03
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite extensive research on cobalt oxides or sulfides, cobalt nanoparticle (Co NP)-based bifunctional electrocatalysts for HER and OER have been less reported, possibly due to the ease of agglomeration of Co NPs and their chemical and poor thermal stability

Method used

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  • Bifunctional graphene oxide loaded cobalt nano particle composite material with core-shell structure
  • Bifunctional graphene oxide loaded cobalt nano particle composite material with core-shell structure
  • Bifunctional graphene oxide loaded cobalt nano particle composite material with core-shell structure

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preparation example Construction

[0031] The preparation method of the core-shell structure Co-Co / GO of the present invention comprises: cobalt nitrate and surfactant are dispersed in the mixed solution of water and isopropanol, add graphene oxide (GO) and glycerol and stir evenly , carry out hydrothermal reaction in the reactor, cool to room temperature after the reaction, wash with ethanol, centrifuge, and dry to obtain CoG@surfactant / GO precursor (cobalt glycerol (CoG@surfactant) nanosheet length with flower-like structure On graphene oxide); the CoG@surfactant / GO precursor is calcined in a hydrogen-argon gas mixture or an argon atmosphere to obtain core-shell Co-Co / GO.

[0032] With the aid of surfactants, cobalt glycerol forms a two-dimensional sheet structure, and is further loaded on the surface of graphene oxide to self-assemble into a flower-like structure. Cobalt glycerol nanosheets grow and assemble along the edges and centers of graphene oxide. After calcination, cobalt glycerol is transformed into...

Embodiment 1

[0033] Example 1: Preparation of core-shell Co-Co / GO

[0034] Weigh 100mg of cobalt nitrate and 5mg of CTAB and dissolve them in a mixed solvent of 10ml of water and 30ml of isopropanol. After stirring evenly, add 30mg of graphene oxide and 8ml of glycerol, ultrasonicate for 20 minutes, and place it in a hydrothermal reaction kettle , reacted at 180°C for 6 hours, cooled to room temperature after the reaction, washed with ethanol and dried to obtain CoG@CTAB / GO with a flower-like structure. CoG@CTAB / GO was first calcined at 200°C for 2h under hydrogen gas, and then calcined at 800°C for 2h at a heating rate of 2°C / min to obtain core-shell structure Co-Co / GO.

Embodiment 2

[0035] Example 2: Preparation of core-shell Co-Co / GO

[0036] Weigh 110mg of cobalt nitrate and 5mg of F127 and dissolve them in a mixed solvent of 10ml of water and 30ml of isopropanol. After stirring evenly, add 20mg of graphene oxide and 8ml of glycerin, ultrasonicate for 20 minutes, and place it in a hydrothermal reaction kettle , reacted at 200 °C for 1 hour, cooled to room temperature after the reaction, centrifuged with ethanol and dried to obtain CoG@F127 / GO with a flower-like structure. CoG@F127 / GO was calcined at 350°C for 2h under hydrogen gas, and then calcined at 750°C for 2h at a heating rate of 2°C / min to obtain core-shell Co-Co / GO.

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Abstract

The invention discloses a bifunctional graphene oxide loaded cobalt nano particle composite material with a core-shell structure. The composite material is formed by uniformly distributing elemental cobalt nano particles with a core-shell structure on graphene oxide, graphene oxide is taken as a growth substrate, two-dimensional nano flaky cobalt glyceroxide carries out self-assembly under the assistance of a surfactant to form a flower-like structure, which is attached on graphene oxide, and the obtained precursor is reduced at a high temperature to form the composite material. A hydrothermalmethod and high-temperature calcination are adopted, the method is simple, nano particles with uniform morphology can be obtained, the stability of the composite material is effectively improved through the anchoring effect of cobalt nano particles on the graphene surface, and the composite material is difficult to corrode by an alkaline solution. Through the synergistic effect between cobalt nano particles and a carbon-based material, the mono-disperse nano particles with a core-shell structure expose more active sites, the catalytic performance is effectively improved, and catalytic hydrolysis of the composite material in an alkaline solution is facilitated.

Description

technical field [0001] The invention belongs to the technical field of bifunctional electrocatalysts for alkaline electrolysis of water, and in particular relates to bifunctional graphene oxide loaded core-shell structure cobalt nanoparticles and its preparation method and application. Background technique [0002] Hydrogen (H 2 ) are considered to be the most promising clean energy carriers in the near future due to their renewable and environmentally friendly properties. Electrochemical water splitting into hydrogen and oxygen has been widely used as an attractive means of sustainable energy conversion and storage. However, the overall water splitting efficiency of most electrocatalysts is usually affected by the unavoidable dynamic overpotential in the hydrogen evolution (HER) and oxygen evolution (OER) reactions. Among them, the lowest thermodynamic potentials of HER and OER are about 1.23 V. The anodic reaction OER is related to the transfer of four electrons and the...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/00B01J37/08C25B1/04C25B11/06
CPCB01J23/75B01J37/084C25B1/04C25B11/091B01J35/393B01J35/23B01J35/33B01J35/397Y02E60/36
Inventor 陈铭韩悦贺薇许诺
Owner YANGZHOU UNIV