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Lithium-insertion selenium compound and preparation method and application thereof

A compound and plug-in technology, applied in the direction of selenium/tellurium compounds, elemental compounds containing selenium/tellurium, chemical instruments and methods, etc., to achieve the effect of large specific surface area, high porosity, and simple preparation method

Active Publication Date: 2019-07-30
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this context, bifunctional electrocatalysts at three pH levels are increasingly required for overall water splitting in a tunable manner for diverse applications, but still remain a great challenge.

Method used

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  • Lithium-insertion selenium compound and preparation method and application thereof
  • Lithium-insertion selenium compound and preparation method and application thereof
  • Lithium-insertion selenium compound and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0033] The invention provides a preparation method of a lithium-inserted selenium compound, comprising: mixing a selenium compound and an organolithium compound in an organic solvent, heating and reacting in a protective atmosphere to obtain a lithium-inserted selenium compound; the selenium The compounds are selenium compounds of the platinum group elements.

[0034] Wherein, the present invention has no special limitation on the sources of all raw materials, which can be commercially available or self-made.

[0035] The selenium compound is a selenium compound of a platinum group element, more preferably iridium diselenide; the particle size of the selenium compound is preferably 400-600nm; the selenium compound is preferably prepared according to the following steps: the selenium powder It is mixed with platinum group metal powder and calcined in vacuum to obtain selenium compounds. The molar ratio of the selenium powder to the platinum group metal powder is preferably 2:1...

Embodiment 1

[0046] Li-IrSe of the present invention 2 The synthesis is divided into two parts, the first step is to synthesize bulk IrSe by solid phase reaction 2 ; The second step lithium ion insertion method to synthesize Li-IrSe 2 .

[0047] 1.1 Synthesis of bulk IrSe by solid state reaction 2 , and its particle size is 400nm ~ 600nm.

[0048] Mix 192.2mg of iridium powder and 157.9mg of selenium powder evenly, add them into the mortar, and grind for 50min. Transfer the ground gray sample to a quartz tube with a length of 20 cm and an inner diameter of 2 cm, and then evacuate the quartz tube to a vacuum degree of 10 -5 torr. Under vacuum, put the quartz tube containing the sample into the muffle furnace, the reaction temperature is 1000°C, the heating rate is 5°C / min, the reaction time is 15h, and then the temperature is naturally cooled to room temperature; take out the quartz tube, shake it manually a few times, and then The reaction temperature is 1000°C, the heating rate is 5...

Embodiment 2

[0059] Example 2 Bulk IrSe 2 and Li-IrSe 2 Catalytic performance test of nanocatalyst

[0060] Adopt the block body IrSe that the embodiment of the present invention 1 makes 2 and Li-IrSe 2 Nanocatalysts were tested for catalytic performance of electrocatalytic hydrogen production, oxygen production and total hydrolysis.

[0061] The block IrSe that 5mg embodiment 1 makes 2 and Li-IrSe 2 Add the nanocatalyst to the mixed solution of 0.5mL of ethanol, 0.47mL of water and 0.03mL of perfluorosulfonic acid, sonicate for 45min, then take 4μL of the sample and drop it on the glassy carbon electrode with a diameter of 3mm. After drying, the glassy carbon electrode on as the working electrode and at 0.5M H 2 SO 4 , 1.0M PBS and 1.0M KOH solution to determine its activity as a catalyst for electrochemical splitting of water to produce hydrogen and oxygen.

[0062] Regarding the electrochemical decomposition of water to produce hydrogen, the scanning speed of linear sweep voltam...

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Abstract

The invention provides a preparation method of a lithium-insertion selenium compound. The preparation method comprises the steps that a selenium compound is mixed with an organic lithium compound in an organic solvent, a heating reaction is carried out in the protective atmosphere, and the lithium-insertion selenium compound is obtained, wherein the selenium compound contains platinum family elements. Compared with the prior art, the lithium-insertion selenium compound is prepared through lithium insertion, the preparation method is simple, and the product obtained by using the method is highin porosity and large in specific surface area and has a lot of selenium vacancies, by using the compounding effect, the lithium-insertion selenium compound is high in activity and stability during water electrolysis.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a lithium intercalated selenium compound, its preparation method and application. Background technique [0002] With the enhancement of environmental awareness and deepening understanding of limited resources, in order to reduce dependence on petrochemical energy and other non-renewable resources, seeking and developing clean, cheap, convenient and effective energy supply methods has become the first task of the energy industry. [0003] Hydrogen, as a green fuel, can be produced simply by electrochemical or photochemical water splitting, providing a solution for building sustainable and environment-friendly energy systems. In recent years, the research and development of various low-pollution battery technologies is in the ascendant, especially new energy technologies such as renewable fuel cells, rechargeable and reusable metal-air batteries, and electrolyzed wate...

Claims

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Application Information

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IPC IPC(8): C01B19/00B01J27/057
CPCC01B19/002B01J27/0573C01P2004/03C01P2004/04C01P2002/72C01P2006/40C01P2004/62B01J35/33Y02E60/36
Inventor 商春彦郑婷婷曹聪周仕明曾杰
Owner UNIV OF SCI & TECH OF CHINA
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