A kind of mos2 nanosphere bifunctional oxygen catalyst with hierarchical structure and its preparation method and application

A hierarchical structure, oxygen catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of superior OER and ORR bifunctional catalytic activity, low cost, and easily available and cheap raw materials

Active Publication Date: 2019-05-21
江苏乐士源新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, there is no information about MoS 2 Report as a bifunctional catalyst for OER and ORR

Method used

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  • A kind of mos2 nanosphere bifunctional oxygen catalyst with hierarchical structure and its preparation method and application
  • A kind of mos2 nanosphere bifunctional oxygen catalyst with hierarchical structure and its preparation method and application
  • A kind of mos2 nanosphere bifunctional oxygen catalyst with hierarchical structure and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 5 mmol Na 2 MoO 4 ·2H 2 O is dissolved in 60ml of water, after fully stirring and mixing, add 15mmol KSCN to the above solution, after stirring and fully dissolving, add 8ml concentrated HCl to it, stir well, transfer into a 100ml hydrothermal reaction kettle, and seal the cover. It was hydrothermally reacted at 140 °C for 32 h, cooled to room temperature, centrifuged, washed with deionized water and anhydrous ethanol in turn, and vacuum dried at 50 °C overnight to obtain MoS with a hierarchical structure. 2 Nanosphere bifunctional oxygen catalyst with a specific surface area of ​​197.26m 2 / g.

Embodiment 2

[0028] 5 mmol Na 2 MoO 4 ·2H 2O is dissolved in 60ml of water, after fully stirring and mixing, add 15mmol KSCN to the above solution, after stirring and fully dissolving, add 8ml concentrated HCl to it, stir well, transfer into a 100ml hydrothermal reaction kettle, and seal the cover. It was hydrothermally reacted at 160 °C for 18 h, cooled to room temperature, centrifuged, washed with deionized water and anhydrous ethanol in turn, and vacuum dried at 50 °C overnight to obtain MoS with a hierarchical structure. 2 Nanosphere bifunctional oxygen catalyst with a specific surface area of ​​202.38m 2 / g.

Embodiment 3

[0030] 5 mmol Na 2 MoO 4 ·2H 2 O is dissolved in 60ml of water, after fully stirring and mixing, add 15mmol KSCN to the above solution, after stirring and fully dissolving, add 8ml concentrated HCl to it, stir well, transfer into a 100ml hydrothermal reaction kettle, and seal the cover. It was hydrothermally reacted at 180 °C for 20 h, cooled to room temperature, centrifuged, washed with deionized water and anhydrous ethanol in turn, and vacuum dried at 50 °C overnight to obtain MoS with a hierarchical structure. 2 Nanosphere bifunctional oxygen catalyst with a specific surface area of ​​186.46m 2 / g.

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Abstract

The invention relates to a MoS2 nanosphere difuncitonal oxygen catalyst of a hierarchy structure a preparation method thereof and application thereof in electrocatalyzing oxygen in an alkaline medium. The MoS2 nanosphere difuncitonal oxygen catalyst is MoS2 nanospheres which are synthesized by taking Na2MoO4 and KSCN as raw materials and adopting a hydrothermal method and have the hierarchy structure, and the MoS2 nanospheres are formed by a plurality of MoS2 nanosheets, so that the MoS2 nanospheres have a large specific surface area, and edge sits of the MoS2 nanosheets are fully exposed. Due to multiporous flower-shaped nanospheres formed by ultra-thin MoS2 nanosheet units, the effective electrochemical catalysis area and the catalytic sites are increased, and the electron conduction rate is quickened, so that overpotential of an oxygen evolution reaction and an oxygen reduction reaction can be effectively reduced; a rotating disk electrode and a rotating ring disk electrode show that the oxygen reduction process is based on a four-electron catalytic mechanism and is a relatively ideal oxygen reduction reaction process.

Description

Technical field: [0001] The invention belongs to the field of new energy material technology and electrochemical catalysis, and particularly relates to MoS with a hierarchical structure 2 The invention relates to a nanosphere bifunctional oxygen catalyst; it also relates to a preparation method of the catalyst and its electrocatalytic application in the oxygen evolution reaction at the anode of alkaline electrolysis water and the oxygen reduction reaction at the cathode of the fuel cell. Background technique: [0002] With the ever-increasing demand for clean and sustainable energy, scientists have devoted a lot of energy to the research and development of efficient, low-cost and environmentally friendly energy conversion and storage systems. Among them, oxygen reduction reaction (ORR) is a ubiquitous cathode reaction in fuel cells and metal-air batteries, and oxygen evolution reaction (OER) plays an important role in solar fuel synthesis and water splitting energy storage s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/051H01M4/90C25B1/04
CPCB01J27/051B01J37/10C25B1/04H01M4/90Y02E60/36Y02E60/50
Inventor 詹天荣田夏罗凯林郭心洁
Owner 江苏乐士源新能源科技有限公司
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