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Platinum monatomic hydrogen oxidation reaction electrocatalyst based on reactant enrichment and preparation method thereof

An electrocatalyst, oxidation reaction technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve problems such as reducing the utilization rate of Pt

Active Publication Date: 2021-09-10
中国人民解放军空军勤务学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The article titled "Highly Selective Pt / TiOx Catalysts for the Hydrogen Oxidation Reaction" reported a porous coated Pt / TiOx / C catalyst in which the Pt active sites were covered by porous TiOx Layer coating, the TiOx layer can effectively inhibit the oxidation and agglomeration of Pt, and improve the HOR intrinsic activity and stability of the Pt catalyst, but the TiOx layer occupies part of the Pt active sites, reducing the utilization of Pt

Method used

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  • Platinum monatomic hydrogen oxidation reaction electrocatalyst based on reactant enrichment and preparation method thereof
  • Platinum monatomic hydrogen oxidation reaction electrocatalyst based on reactant enrichment and preparation method thereof
  • Platinum monatomic hydrogen oxidation reaction electrocatalyst based on reactant enrichment and preparation method thereof

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Effect test

Embodiment 1

[0044] Example 1 A preparation method of electrocatalyst for platinum single-atom hydrogen oxidation reaction based on reactant enrichment

[0045] The preparation method of embodiment 1 comprises the following steps carried out in sequence:

[0046] Preparation of spherical nano-silica carrier by chemical precipitation method:

[0047] Take 20L ethanol and 40L deionized water, mix well, add 0.6L tetramethyl silicate and 0.2kg cetyltrimethylammonium chloride (CTAC) surfactant, stir at room temperature for 1 hour, then add 0.8 L of ammonia solution with a mass fraction of 25%, was stirred at room temperature for 4 hours, and the filtered product was washed with deionized water and ethanol successively, dried at 60°C, and then heated at 600°C in air for 6 hours to obtain spherical nanometer Silica carrier, spare.

[0048] Among them, the spherical nano-silica carrier can also be obtained through commercial channels.

[0049] S1: Preparation of Pt x+ / SiO 2 Intermediates:

...

Embodiment 2-8

[0061] Example 2-8 Preparation method of platinum single-atom hydrogen oxidation reaction electrocatalyst based on reactant enrichment

[0062] Examples 2-8 are respectively a preparation method of electrocatalysts for platinum single-atom hydrogen oxidation based on the enrichment of reactants. These preparation methods are basically the same as in Example 1, the difference lies in the selection of raw materials and the adjustment of other process parameters. See Table 1 for raw material marking codes, and Table 2 for process parameter adjustments.

[0063] Table 1 Raw material marking code

[0064]

[0065] Table 2 embodiment 2-8 technological parameter

[0066]

[0067]

[0068]

[0069] The prepared platinum single-atom hydrogen oxidation reaction electrocatalyst based on reactant enrichment is Pt 1 @PNC Catalyst, J2-J8 are all hollow core-shell electrocatalysts composed of catalytic active centers and porous nitrogen-doped hollow carbon shells (PNC), in whic...

Embodiment 9

[0070] Example 9 Performance detection of platinum single-atom hydrogen oxidation reaction electrocatalyst based on reactant enrichment

[0071] 1) Pt 1 H of @PNC catalyst J1 and Pt / C 2 -Stripping curve

[0072] Experimental method: 5 mg of Pt 1 Mix @PNC with 970 μL of isopropanol and 30 μL of Nafion membrane solution (5% by mass, DuPont), and disperse evenly by ultrasonic oscillation for 40 minutes, draw 5 μL and evenly coat it on the glassy carbon rotating ring disk electrode, and dry it in the air for 10 minutes to obtain the catalyst Working electrode JJ1;

[0073] Place the catalyst working electrode in hydrogen-saturated 0.1M HClO 4 After 20 minutes in the electrolyte, switch the hydrogen gas to nitrogen to dissolve the hydrogen gas dissolved in the electrolyte, and record the linear scanning polarization curve on the electrochemical workstation (CHI650E, Shanghai Chenhua Instrument Co., Ltd.), and the scanning range is 0.075-1.0V (relative to the standard Hydrogen ...

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Abstract

The invention belongs to the technical field of electrocatalysts, and discloses a platinum monatomic hydrogen oxidation reaction electrocatalyst based on reactant enrichment and a preparation method thereof. The platinum monatomic hydrogen oxidation reaction electrocatalyst is a hollow core-shell structure electrocatalyst which is composed of monatomic distribution noble metal as a catalytic activity center and a porous nitrogen-doped hollow carbon shell, and has the noble metal loading capacity of 1-12%. The Pt1@PNC catalyst is finally prepared by preparing a Ptx < + > / SiO2 intermediate and a Pt1 / SiO2@PNC intermediate. The preparation method disclosed by the invention is simple and convenient to operate and low in cost. The metal platinum in the prepared Pt1@ PNC catalyst is in a monatomic state and is uniformly distributed on the inner surface of the PNC, so that the adsorption and oxidation rate of hydrogen on the surface of a Pt1 active center is improved, and the Pt1@PNC catalyst shows excellent hydrogen oxidation reaction activity and stability under a relatively low potential. The catalyst is suitable for being applied to electro-catalytic hydrogen oxidation reaction and hydrogen evolution reaction as a catalyst.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysts, and relates to electrocatalysts for hydrogen oxidation reactions, in particular to electrocatalysts for platinum single-atom hydrogen oxidation reactions based on enrichment of reactants and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is a kind of highly efficient energy conversion that uses high-energy hydrogen as fuel, and converts the chemical energy stored in hydrogen fuel and oxidant into electrical energy at a temperature below 100 °C through the action of an electrocatalyst. device. When PEMFC is running, the fuel does not go through the combustion process and is not limited by the Carnot cycle. The energy conversion efficiency is as high as 40%-60%. It is a clean, quiet and environmentally friendly power generation device. Based on these advantages, PEMFC has broad application prospects in the fields of UAV power supply ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04C25B1/01
CPCC25B11/091C25B1/04C25B1/01Y02E60/36
Inventor 陈腾胡建强郭力杨士钊谢凤季峰高华帅徐新
Owner 中国人民解放军空军勤务学院
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