Nano catalyst of multi-corner-angle gradient structure and preparation method thereof

A nano-catalyst and gradient structure technology, applied in chemical instruments and methods, physical/chemical process catalysts, structural parts, etc., to achieve good electrochemical catalytic oxidation performance, simple preparation method, and improved roughness.

Active Publication Date: 2016-03-16
郑州天兆医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the particle growth process of the coordination-controlled growth method for the preparation of platinum-based nanoparticles, or during the extended potential cycling, the active point crystal plane (111) or high-index crystal planes are often reduced, thus, the synthesis of high surface active Ultra-small Pt-based particles with atomic numbers, high-index crystal planes or (111) crystal planes, and rich angular and sideband structures are still extremely challenging

Method used

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  • Nano catalyst of multi-corner-angle gradient structure and preparation method thereof
  • Nano catalyst of multi-corner-angle gradient structure and preparation method thereof
  • Nano catalyst of multi-corner-angle gradient structure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] Below with (Fe-Pt)(Fe 1-x Pt x )O(OH) as an example to illustrate its preparation process and its electrochemical catalytic oxidation performance and CO poisoning resistance.

[0037] Step 1: configure salt solution, described salt solution is to use 0.28g (1.4mmol) FeCl 2 4H 2 O, 0.36g (0.7mmol) H 2 PtCl 6 ·6H 2 O, a solution formed by dissolving 0.53g (Mw=10000) of PVP in 50mL of N-methylpyrrolidone (NMP);

[0038] Step 2: configuring a reducing agent solution, the reducing agent solution is a colorless and transparent solution obtained by dissolving 0.35g (9.4mmol) NaBH in 50mL NMP;

[0039] Step 3: Use a syringe to extract 40ml of the solution configured in step 1 and step 2 respectively, place it on the syringe pump, adjust the flow rate V to 5-10ml / min, and let the reactants react in the microfluidic reaction device, as shown in the figure ( 3) and (4) are preheating devices to preheat the reducing agent and salt solution, and the preheated reducing agent a...

Embodiment 2

[0044] Step 1: configure salt solution, described salt solution is to use 0.28g (1.4mmol) FeCl 2 4H 2 O, 0.36g (0.7mmol) H 2 PtCl 6 ·6H 2 O, the solution that 0.53g (Mw=10000) PVP is dissolved in 50mLNMP forms;

[0045] Step 2: configure the reducing agent solution, the reducing agent solution is 0.35g (9.4mmol) NaBH 4 A colorless transparent solution obtained by dissolving in 50mL NMP;

[0046] Step 3: Use a syringe to draw 40ml of the solution prepared in Step 1 and Step 2 respectively, and place it on the syringe pump, and adjust the flow rate V to 5-10ml / min. The reducing agent and salt solution are preheated, and the preheated reducing agent and salt solution are mixed in the Y-shaped mixer at (5) to complete the process of nucleation-growth-termination, and in the figure (7) Collect the product. The preheating temperature is set to 120°C, the temperature of the thermostat 2 is set to 30°C, and the receiving temperature is set to 0°C;

[0047] Step 4: centrifuge t...

Embodiment 3

[0051] Step 1: configure salt solution, described salt solution is to use 0.28g (1.4mmol) FeCl 2 4H 2 O, 0.36g (0.7mmol) H 2 PtCl 6 ·6H 2 O, the solution that 0.53g (Mw=10000) PVP is dissolved in 50mLNMP forms;

[0052] Step 2: configure the reducing agent solution, the reducing agent solution is 0.35g (9.4mmol) NaBH 4 A colorless transparent solution obtained by dissolving in 50mL NMP;

[0053] Step 3: Use a syringe to draw 40ml of the solution prepared in Step 1 and Step 2 respectively, and place it on the syringe pump, and adjust the flow rate V to 5-10ml / min. The reducing agent and salt solution are preheated, and the preheated reducing agent and salt solution are mixed in the Y-shaped mixer at (5) to complete the process of nucleation-growth-termination, and in the figure (7) Collect the product, and dissolve the carbon black with 4 times the mass of the metal salt content in 10ml NMP and place it in the receiving device, so that the product obtained above is direct...

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Abstract

The invention discloses a nano catalyst of a multi-corner-angle gradient structure and a preparation method thereof, and belongs to the field of nano composite materials. The nano catalyst of the multi-corner-angle gradient structure is the Pt doped transition metal oxide (M-Pt)@(M1-xPtx)O(OH) with the hydroxylated surface layer or the Pt doped transition metal oxide (M-Pt)@(M1-xPtx)O(OH) / carrier nano composite material, highly dispersed at different carriers, with the hydroxylated surface layer, and the size is 1-3 nm. After the nano catalyst of the multi-corner-angle gradient structure is subjected to heat treatment, M is reduced, and the surface layer effective transition metal relative content is increased, the surface layer roughness is improved, and active points are sufficiently exposed. The catalyst has the more excellent electrochemical catalytic oxidation performance and CO-poisoning resistance.

Description

technical field [0001] The invention belongs to the field of nanocomposite materials, and in particular relates to a preparation method of nanocomposite materials with multi-angular gradient structures and the characteristics of these materials in terms of electrochemical catalytic oxidation. Background technique [0002] Due to the increasing global energy demand, the consumption of fossil fuels and the increasingly serious environmental pollution, the development of efficient and non-polluting energy technologies (such as fuel cells) to replace the original energy technologies based on fossil fuel combustion has become the current research topic. Hotspots, the development of highly efficient, stable and reliable catalysts is a key link in the realization of this type of new energy technology. Pt is one of the most effective electrode catalysts for direct methanol fuel cells. It has high catalytic efficiency and good acid and alkali resistance. However, Pt is a noble metal,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89H01M4/92
CPCY02E60/50
Inventor 宋玉军王俊美
Owner 郑州天兆医疗科技有限公司
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