Oxygen reduction reaction catalyst and preparation method thereof

A catalyst and reaction technology, applied in the field of electrochemistry, can solve the problems of complex reduction process and cumbersome synthesis steps, and achieve the effect of enhancing oxygen reduction activity and simple preparation method

Pending Publication Date: 2022-05-10
先进能源产业研究院(广州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, Pt nanorods are mainly synthesized by the hard template method, which requires pre-synthesis of various nanowire templates, such as Ag, Cu, ZnO and Te nanowires, and the synthesis steps are cumbersome.
Although there are also Pt nanorods synthesized by the self-template method in the prior art, the process used is relatively complicated in the preparation of the precursor and its reduction.

Method used

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  • Oxygen reduction reaction catalyst and preparation method thereof
  • Oxygen reduction reaction catalyst and preparation method thereof
  • Oxygen reduction reaction catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 10mL 0.05mol / L ethanol solution of phenanthroline to 5mL 0.05mol / L K 2 PtCl 4 The aqueous solution was mixed evenly, and the resulting mixed solution was heated and stirred in a water bath at 80°C for 1 hour to make the Pt 2+ Fully complex with o-phenanthroline to form o-phenanthroline-Pt(II) complex precipitation, then use a 1:1 ratio of hydrated ethanol mixture for centrifugation and washing 4 times, then pour it into a magnetic boat and dry it in a 60°C oven ; Finally, put the magnetic boat into a tube furnace, calcinate at 200° C. for 2 hours under hydrogen, centrifuge, wash, and dry in vacuum to obtain the product.

[0026] Depend on figure 1 It can be seen that the obtained product is Pt.

[0027] Depend on figure 2 It can be seen that the obtained product is a one-dimensional rod-like structure.

[0028] pass image 3 After observation, it can be seen that the surface of Pt nanorods is rough and has many holes.

[0029] The porous Pt nanorods prepared...

Embodiment 2

[0032] Pour 30mL of 0.05mol / L ethanol solution of phenanthroline into 15mL of 0.05mol / L K 2 PtCl 4 The aqueous solution was mixed evenly, and the resulting mixed solution was heated and stirred in a water bath at 80°C for 1 hour to make the Pt 2+ Fully complex with o-phenanthroline to form o-phenanthroline-Pt(II) complex precipitation, then use a 1:1 ratio of hydrated ethanol mixture for centrifugation and washing 4 times, then pour it into a magnetic boat and dry it in a 60°C oven ; Finally, the magnetic boat was put into a tube furnace, calcined at 200° C. for 2 hours under hydrogen conditions, centrifuged, washed, and vacuum-dried to obtain the product porous Pt nanorods, see Figure 4 .

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Abstract

The invention belongs to the technical field of electrochemistry, and particularly relates to an oxygen reduction reaction catalyst and a preparation method thereof. According to the preparation method, phenanthroline is taken as a complexing agent, potassium chloroplatinite is taken as a platinum source, ethanol and water are taken as solvents, strong complexation of Pt < 2 + > and phenanthroline is utilized, the mixture is mixed at normal temperature to obtain a brown phenanthroline-Pt (II) complex precursor, the precursor has a uniform rod-like structure with a smooth surface, the precursor is taken as a template and is reduced in a hydrogen atmosphere, and the complex is prepared. The porous Pt nanorod is obtained. The porous Pt nanorod, as a catalyst, shows relatively high catalytic activity in the aspect of catalyzing oxygen reduction reaction in an acidic medium.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an oxygen reduction reaction catalyst and a preparation method thereof. Background technique [0002] The oxygen reduction reaction is an extremely critical half-reaction in metal-air batteries and fuel cells, and the oxygen reduction reaction catalyzed by Pt-based nanomaterials is one of the most widely studied electrochemical reactions. However, the practical application of some fuel cells still faces several key issues, such as slow oxygen reduction reaction kinetics at the cathode, carbon monoxide poisoning and alcohol / acid crossover at the anode, and activity reduction due to catalyst dissolution, aggregation, and Ostwald ripening. Therefore, improving the activity, selectivity, and durability of cathode Pt electrocatalysts for ORR is extremely important to promote the commercial application of fuel cells. [0003] The activity of electrocatalysts is hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92B82Y30/00B82Y40/00
CPCH01M4/928B82Y30/00B82Y40/00
Inventor 陈忠伟韦小玲王新
Owner 先进能源产业研究院(广州)有限公司
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