Homologous and heterogeneous interface structure composite material and preparation method thereof

A composite material and heterogeneous interface technology, applied in the field of electrochemical catalysis, can solve the problems of not fully reflecting the essential characteristics of the homologous heterogeneous interface, and the interface structure and internal materials cannot be well exposed, so as to achieve excellent electrocatalytic activity and its stability, significant interfacial effects, rapid heating and cooling effects

Active Publication Date: 2022-03-22
TIANJIN UNIV
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  • Description
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  • Application Information

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Problems solved by technology

After investigation, there are few research reports on homologous heterogeneous interfaces, and most of the homologous heterogeneous interfaces are obtained by incomplete oxidation or sulfidation of transition metals, and their structures are mostly core-shell structures. The shell structure is difficult to fully play a role in the electrocatalytic process because its interface structure and internal materials cannot be well exposed, and it cannot fully reflect the essential characteristics of the homologous heterogeneous interface

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  • Homologous and heterogeneous interface structure composite material and preparation method thereof
  • Homologous and heterogeneous interface structure composite material and preparation method thereof
  • Homologous and heterogeneous interface structure composite material and preparation method thereof

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preparation example Construction

[0055] In a specific embodiment, a method for preparing a homologous heterogeneous interface composite material is also provided, comprising the following steps:

[0056] A. Preparation of metal salt and thiourea precursor loaded on carbon fiber substrate: Soak carbon fiber substrate in a mixed aqueous solution of metal salt and thiourea to obtain metal salt and thiourea loaded carbon fiber;

[0057] B. Preparation of homologous heterogeneous interface composite material: connect the metal salt and thiourea-loaded carbon fiber to an external circuit, and instantaneously energize to obtain the homologous heterogeneous interface composite material.

[0058] In the present invention, the carbon fiber is soaked in the mixed solution of metal salt and thiourea first, and then through instantaneous energization, in this process, the metal / alloy sulfide is first generated on the surface of the carbon fiber, and the sulfide is reduced to metal / alloy due to carbothermal reduction. Allo...

Embodiment 1

[0080] This embodiment provides a homologous heterogeneous interface Co / Co 9 S 8 A method for preparing a carbon nanofiber composite material, comprising the following steps:

[0081] (1) Preparation of electrospinning solution: dissolve polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF), stir to obtain a homogeneous solution, and polyacrylonitrile (PAN) and N,N- The mass ratio of dimethylformamide (DMF) is 1:9;

[0082] (2) Transfer the homogeneous solution into a syringe and perform electrospinning with an electrospinning machine. The working parameters of electrospinning are: working voltage 25kV, distance between needle tip and collector 15cm, solution flow rate 1mL h -1 , to obtain white felt-like electrospun nanofibers;

[0083] (3) Place the electrospun nanofibers in a tube furnace and heat at 1°C min from room temperature -1 Heating to 270°C at a rate of 2h for pre-oxidation, then, in an inert atmosphere at 5°C min -1 The temperature was raised to 1000°C at a ...

Embodiment 2

[0093] This embodiment provides a homologous heterogeneous interface Ni / Ni 3 S 2 A method for preparing a carbon nanofiber composite material, comprising the following steps:

[0094] (1) Preparation of electrospinning solution: dissolve polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF), stir to obtain a homogeneous solution, and polyacrylonitrile (PAN) and N,N- The mass ratio of dimethylformamide (DMF) is 1:9;

[0095] (2) Transfer the homogeneous solution into a syringe and perform electrospinning with an electrospinning machine. The working parameters of electrospinning are: working voltage 25kV, distance between needle tip and collector 15cm, solution flow rate 1mL h -1 , to obtain white felt-like electrospun nanofibers;

[0096] (3) Place the electrospun nanofibers in a tube furnace and heat at 1°C min from room temperature -1 Heating to 270°C at a rate of 2h for pre-oxidation, then, in an inert atmosphere at 5°C min -1 The temperature was raised to 1000°C at a ...

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Abstract

The invention discloses a homologous and heterogeneous interface structure composite material and a preparation method thereof. The composite material is interface structure M / MxSy composite nanoparticles composed of transition metal or alloy and sulfide corresponding to the transition metal or alloy, wherein M is a metal element or an alloy, and MxSy is a sulfide corresponding to the metal element or the alloy; in the M / MxSy composite material, the heterogeneous interface structure of the metal simple substance or alloy and the corresponding sulfide is an AB left-right type interface structure. The M / MxSy heterostructure composite nanoparticles rapidly grow on the surface of the carbon fiber by applying the instantaneous voltage and are highly dispersed, and the generated heterointerface of the metal elementary substance / alloy and the metal sulfide is an AB left-right interface, so that the active sites of the heterointerface can be well exposed, and the electrocatalytic activity of the composite material is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemical catalysis, and in particular relates to a homogeneous heterogeneous interface structure composite material and a preparation method thereof, in particular to a metal / metal sulfide interface or alloy / alloy vulcanization composed of a transition metal or alloy and its sulfide Composites with homologous and heterogeneous interface structures and methods for their preparation. Background technique [0002] With the development of science and technology, it is of great significance to develop and design high-efficiency, low-cost, high-stability and excellent-performance catalytic materials used in the fields of environment and energy. Studies have shown that the size and structure of nanomaterials can strongly affect their physical and electrochemical properties. Single-component catalytic materials can no longer meet the requirements of energy and material technology due to their single physi...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J35/02B01J35/06B01J37/34
CPCB01J27/043B01J37/342B01J35/33B01J35/50B01J35/58
Inventor 郑学荣卢琪吴晗毛晶王杨邓意达
Owner TIANJIN UNIV
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