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Preparation method of platinum-base nano-sheet electrocatalyst

A technology of electrocatalysts and nanosheets, which is applied in circuits, electrical components, battery electrodes, etc., can solve the problems that have not been reported on two-dimensional platinum-based catalysts, and achieve aerobic reduction reaction catalytic activity, high battery performance, and preparation technology simple effect

Inactive Publication Date: 2018-08-07
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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Problems solved by technology

However, there are no related reports on two-dimensional platinum-based catalysts

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  • Preparation method of platinum-base nano-sheet electrocatalyst
  • Preparation method of platinum-base nano-sheet electrocatalyst
  • Preparation method of platinum-base nano-sheet electrocatalyst

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preparation example Construction

[0054] The invention provides a method for preparing a platinum-based nanosheet electrocatalyst, such as Figure 13 As shown, the method mainly uses nickel nanobelt as a template to prepare platinum nanosheets by electrochemical displacement method, including the following steps:

[0055] First, step S1 is performed to prepare nickel nanobelts, and disperse the nickel nanobelts in deionized water to obtain a dispersion solution.

[0056] As an example, the steps for preparing nickel nanobelts mainly include the preparation of nickel precursor solution and the hydrothermal synthesis of nickel nanobelts. Specifically include the following steps:

[0057] 1-1) Preparation of nickel precursor solution: Weigh the nickel water-soluble salt according to the concentration ratio, dissolve the nickel water-soluble salt in deionized water, then add complexing agent, alkaline substance, surfactant and reducing agent, and then obtain a nickel precursor solution through ultrasonication an...

Embodiment 1

[0080] Example 1: Preparation of Ni NBs

[0081] (1) Preparation of nickel precursor solution. Weigh 2.971g NiCl 2 2H 2 O was dissolved in 250ml deionized water and placed in a 500mL beaker. Then successively weigh 43.14g Na 2 C 4 h 4 o 6 , 50g NaOH, 1.307g SDBS and 10.599g NaH 2 PO 2 ·H 2 O, was added to the beaker, and a uniformly mixed nickel precursor solution was obtained by ultrasonication and stirring.

[0082] (2) Preparation of Ni NBs. The nickel precursor solution prepared in (1) was transferred to a polytetrafluoroethylene-lined stainless steel reaction kettle with a volume of 300 mL, sealed and placed in a muffle furnace at 110 °C for 24 hours to react. After the reaction was finished, it was cooled to room temperature to obtain nickel nanobelts as a brown solid product. Then, it was washed with deionized water and absolute ethanol in sequence, and then dried in a vacuum oven at 60°C for 3 hours.

[0083] (3) The obtained product is characterized by XR...

Embodiment 2

[0084] Embodiment 2: Preparation of Pt NSs

[0085] (1) Weigh 30 mg of Ni NBs prepared in Example 1, put it into a 100 mL glass bottle with a cover, and add 80 mL of deionized water. Subsequent ultrasonic dispersion for 30 minutes resulted in a homogeneously dispersed suspension.

[0086] (2) Place the glass bottle containing the Ni NBs dispersion in (1) in a 70°C water bath. Weigh 62.3mg K 2 PtCl 4 Dissolved in 10mL of deionized water, then added dropwise into a glass bottle, an electrochemical displacement reaction between nickel and platinum occurred.

[0087] (3) Immediately after step (2), 1 mL of concentrated hydrochloric acid was added to 9 mL of deionized water, and then the resulting solution was added to a glass bottle.

[0088] (4) Keep the glass bottle at 70°C for 3 hours. After the reaction was completed, the obtained product was washed with deionized water, and then dried in a vacuum oven at 60° C. for 3 hours to obtain Pt NSs.

[0089] (5) The obtained produ...

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Abstract

The invention provides a preparation method of a platinum-base nano-sheet electrocatalyst. The preparation method comprises the following steps: firstly preparing a nickel nano-belt, and dispersing the nickel nano-belt into deionized water; preparing a platinum precursor solution and an acid solution, and adding the platinum precursor solution and the acid solution into the deionized water to generate electrochemistry replacement reaction by virtue of nickel and platinum at a set temperature, so as to obtain a platinum nano-sheet; or preparing the platinum precursor solution, adding the platinum precursor solution into the deionized water to generate electrochemistry replacement reaction by virtue of nickel and platinum at a set temperature so as to generate an intermediate, carrying out thermal treatment on the intermediate under the protection of inert gas, and cleaning by virtue of the acid solution, so as to obtain a porous platinum-nickel nano-sheet. The preparation process of thepreparation method is simple, the prepared platinum nano-sheet or porous platinum-nickel nano-sheet has excellent catalytic activity to oxygen reduction reaction, can be applied to direct alcohol batteries and proton exchange membrane fuel cells and has relatively high battery performance.

Description

technical field [0001] The invention relates to the field of a proton exchange membrane fuel cell and a direct alcohol fuel cell, in particular to a preparation method of a platinum-based nanosheet electrocatalyst. Background technique [0002] Because of its high-efficiency, continuous and clean energy, fuel cells have become an urgently needed power supply technology for portable electronic devices and electric vehicle energy supply systems. A fuel cell converts the chemical energy of a fuel into electrical energy through an electrochemical process. Among them, the catalyst plays a key role in the electrochemical process, is the core of fuel cell technology, and also determines the electrical output performance of the battery to a large extent. So far, platinum-based nanomaterials are recognized as the most efficient electrocatalysts for oxygen reduction reaction (ORR) in fuel cell cathodes. Platinum nanoparticles supported on carbon (Pt / C) is currently the most widely u...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/88
CPCH01M4/88H01M4/92Y02E60/50
Inventor 杨辉王国樑邹志青邹亮亮蒋晶晶周毅
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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