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Oxygen evolution/hydrogen evolution two-dimensional cobalt monoxide-coated cobalt diselenide-coated nitrogen-doped carbon nanotube/graphene bifunctional composite catalyst

A composite catalyst, cobalt diselenide technology, applied in physical/chemical process catalysts, catalyst activation/preparation, chemical instruments and methods, etc., to improve catalytic activity and stability, high conductivity, and facilitate the transfer of electrons Effect

Active Publication Date: 2020-04-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the significant difference in the mechanism of OER and HER, there are huge challenges in the preparation process and mechanism of developing such bifunctional catalysts.

Method used

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  • Oxygen evolution/hydrogen evolution two-dimensional cobalt monoxide-coated cobalt diselenide-coated nitrogen-doped carbon nanotube/graphene bifunctional composite catalyst
  • Oxygen evolution/hydrogen evolution two-dimensional cobalt monoxide-coated cobalt diselenide-coated nitrogen-doped carbon nanotube/graphene bifunctional composite catalyst
  • Oxygen evolution/hydrogen evolution two-dimensional cobalt monoxide-coated cobalt diselenide-coated nitrogen-doped carbon nanotube/graphene bifunctional composite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] CoO@CoSe 2 Preparation of @N-CNTs / rGO-500

[0036] GO was prepared by a modified Hummers method. Weigh 1 g flake graphite and 20 g NaCl, mix and grind for 15 min, and use deionized water to wash away NaCl by vacuum filtration. Wet graphite powder was vacuum-dried at 60°C for 30min, then transferred to a 250mL round bottom flask, then added 23mL of concentrated sulfuric acid and magnetically stirred for 24h, then heated to 35°C and added 0.5g NaNO under stirring 3 . After 5 min, the suspension was transferred to an ice bath, and 3 g of KMnO was added very slowly with stirring 4 And control the temperature of the system below 20°C, then heat at 35°C for 120min with stirring, slowly add 46mL of deionized water, heat to 98°C and stir for 30min. When the mixture was cooled to room temperature, stirring was continued for 30 min, and then 140 mL of deionized water and 10 mL of 30 wt% H 2 o 2 . The precipitate was centrifuged, washed five times with 5wt% HCl solution and...

Embodiment 2

[0042] With CoO@CoSe 2 @N-CNTs / rGO-450 is a bifunctional catalyst for OER and HER.

[0043] According to the method of Example 1 in CoO@CoSe 2 The selenization temperature of @N-CNTs / rGO-500 was 450℃ to prepare CoO@CoSe 2 @N-CNTs / rGO-450.

[0044] The evaluation method of catalytic performance is the same as in Example 1.

[0045] CoO@CoSe 2 The onset potential of @N-CNTs / rGO-450 as an OER catalyst is 1.426 V (vs. RHE). At a current density of 10mA / cm 2 , the required overpotential η is 293mV (vs.RHE). The Tafel slope is 69mV / dec.

[0046] CoO@CoSe 2 The onset potential of @N-CNTs / rGO-450 as a HER catalyst is close to 0 (vs. RHE). At a current density of 10mA / cm 2 , the required overpotential η is 253mV (vs.RHE). The Tafel slope is 90mV / dec.

Embodiment 3

[0048] With CoO@CoSe 2 @N-CNTs / rGO-550 is a bifunctional catalyst for OER and HER.

[0049] According to the method of Example 1 in CoO@CoSe 2 The selenization temperature of @N-CNTs / rGO-550 was 550℃ to prepare CoO@CoSe 2 @N-CNTs / rGO-550.

[0050] The evaluation method of catalytic performance is the same as in Example 1.

[0051] CoO@CoSe 2 The onset potential of @N-CNTs / rGO-550 as an OER catalyst is 1.415 V (vs. RHE). At a current density of 10mA / cm 2 , the required overpotential η is 279mV (vs.RHE). The Tafel slope is 70mV / dec.

[0052] CoO@CoSe 2 The onset potential of @N-CNTs / rGO-550 as a HER catalyst is -0.089 V (vs. RHE). At a current density of 10mA / cm 2 , the required overpotential η is 257mV (vs.RHE). The Tafel slope is 54mV / dec.

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Abstract

The invention discloses an oxygen evolution / hydrogen evolution two-dimensional cobalt monoxide-coated cobalt diselenide-coated nitrogen doped carbon nanotube / graphene bifunctional composite catalyst.The catalyst is formed by loading cobalt monoxide nanoparticles, cobalt diselenide nanoparticles and nitrogen-doped carbon nanotubes on a two-dimensional graphene sheet together, the preparation method comprises the following steps: mixing cobalt salt, a nitrogen-containing organic small molecular compound and graphene oxide through a liquid phase, drying, placing in a protective atmosphere, carrying out two-stage roasting treatment, and carrying out partial selenylation treatment on the roasted product and selenium powder in the protective atmosphere at a high temperature, thereby obtaining the product. The preparation process is simple, low in cost and beneficial to industrial production; the obtained composite catalyst is applied to an electrolytic decomposition process of water, has the characteristics of high activity and good stability, and shows a good application prospect.

Description

technical field [0001] The present invention relates to an oxygen evolution (OER) and hydrogen evolution (HER) bifunctional composite catalyst and its preparation and application method, in particular to a high-performance oxygen evolution / hydrogen evolution two-dimensional CoO@CoSe 2 @N-CNTs / rGO bifunctional composite catalyst and its preparation method, also involving CoO@CoSe 2 The application of @N-CNTs / rGO bifunctional composite catalyst in the electrolysis of water belongs to the field of electrocatalysis technology. Background technique [0002] Hydrogen energy is considered to be one of the most promising new clean energy sources because of its high energy density, the oxidation product is only water, and it can be recycled. The electrolysis of water using water as raw material is a zero-emission hydrogen production process without any pollutant release. The process and equipment are simple, easy to operate, and have great potential for large-scale application. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08C25B1/04
CPCB01J27/24B01J37/088B01J37/08C25B1/04B01J35/33B01J35/40Y02E60/36
Inventor 钱东徐德垚苏侃达龙炫达张志良李俊华
Owner CENT SOUTH UNIV
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