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Preparation method of Pt-based multi-component alloy nano electrocatalyst

A technology of alloy nanometers and electrocatalysts, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of affecting the long-term working stability of fuel cells and cumbersome operation steps , metal particle coalescence and other problems, to achieve the effect of being suitable for large-scale production, simple method and reducing energy consumption

Pending Publication Date: 2020-10-09
宁波中科科创新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent CN05355935A Mix carbon carrier, alkaline substance and precious metal salt solution evenly to prepare suspension, condense and reflux for more than 0.5h at 50-200°C, remove the supernatant after standing for precipitation; add reducing agent and stir for more than 0.5h Finally, the product is heat-treated at 100-800°C for 0.5-5 hours in a mixed atmosphere of one or more of ammonia, helium, argon, and hydrogen to obtain a noble metal electrocatalyst, but this type of method still has cumbersome operating steps. , uneven reaction and other shortcomings
[0004] Although some progress has been made in the research of binary platinum-based nanocatalysts, such catalyst particles are prone to surface migration or dissolution / reprecipitation and coalescence of metal particles during the operation of fuel cells, which seriously affects the long-term stability of fuel cells. sex

Method used

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  • Preparation method of Pt-based multi-component alloy nano electrocatalyst
  • Preparation method of Pt-based multi-component alloy nano electrocatalyst
  • Preparation method of Pt-based multi-component alloy nano electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: 20% wt Pt 2 Preparation of RuCo / C (Pt:Ru:Co=2:1:1) Nano Electrocatalyst

[0038] (1) Raw material mixing: Pt:Ru:Co=2:1:1 by molar ratio, weigh and dissolve sodium chloroplatinate, ruthenium chloride and cobalt chloride in deionized water, stir until completely dissolved; Add an appropriate amount of potassium bicarbonate to the solution with metal ions to adjust the pH of the solution to 7;

[0039] (2) Carbon carrier injection: add a certain amount of carbon black to the solution so that the target metal loading is 20%, and continue stirring to disperse it evenly.

[0040] (3)Pt 2 Preparation of RuCo hydroxide: adjust the temperature of the reaction system to 60°C for 2h, filter and wash, then dry at 60°C for 4h.

[0041] (4) Catalyst heat treatment: Heat the dried product at 200°C under hydrogen for 2 hours and then pass it into N 2 After cooling for 30 minutes, take it out to obtain 20%wt Pt2RuCo / C nanometer electrocatalyst.

Embodiment 2

[0042] Example 2: 20% wt Pt 2 Preparation of RuCo / C (Pt:Ru:Co=2:1:1) Nano Electrocatalyst

[0043] (1) Raw material mixing: Pt:Ru:Co=2:1:1 by molar ratio, weigh and dissolve sodium chloroplatinate, ruthenium chloride and cobalt chloride in deionized water, stir until completely dissolved; Add an appropriate amount of potassium bicarbonate to the solution with metal ions to adjust the pH of the solution to 7;

[0044] (2) Carbon carrier injection: add a certain amount of carbon black to the solution so that the target metal loading is 20%, and continue stirring to disperse it evenly.

[0045] (3)Pt 2 Preparation of RuCo hydroxide: adjust the temperature of the reaction system to 60°C for 2h, filter and wash, then dry at 60°C for 4h.

[0046] (4) Catalyst heat treatment: The dried product was subjected to plasma-assisted heat treatment at 100°C under hydrogen for 2 hours, and then N 2 30min, take out after cooling and it will be 20%wt Pt 2 RuCo / C nano electrocatalyst. The...

Embodiment 3

[0049] Example 3: 40% wt PtCo 2 Preparation of Ni / C(Pt:Co:Ni=1:2:1) Nano Electrocatalyst

[0050] (1) Mixing of raw materials: Pt:Pd:Co=1:2:1 ratio is weighed and dissolved in deionized water containing chloroplatinic acid sodium, cobalt chloride and nickel acetate by molar ratio, and stirred until completely dissolved; An appropriate amount of sodium bicarbonate is added to the solution of metal ions to adjust the pH of the solution to 11;

[0051] (2) Injection of carbon carrier: add a certain amount of carbon black to the solution to make the metal loading 40%, and continue to stir to make it uniformly dispersed.

[0052] (3) PtCo 2 Preparation of Ni hydroxide: adjust the temperature of the reaction system to 80°C for 10h, filter and wash, then dry at 60°C for 4h.

[0053] (4) Catalyst heat treatment: After the dried product was subjected to plasma-assisted heat treatment at 200 °C under CO atmosphere for 2 h, N 2 40%wt PtCo after 30min cooling 2 Ni / C nano electrocata...

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Abstract

The invention relates to a preparation method of a Pt-based multi-component alloy nano electrocatalyst, which comprises the following steps: weighing a platinum-containing compound, an X metal salt and a Y metal salt according to the target composition, and dissolving in deionized water to form a solution in which metal ions are dissolved, with X and Y being base metals; adding a proper amount ofweakly alkaline substances into the solution, with the alkalinity of the weakly alkaline substances being smaller than that of ammonia water; adding a carrier or a sacrificial template into the solution, and uniformly dispersing; reacting the solution at a proper temperature for a period of time to form Pt-XY hydroxide, and loading the Pt-XY hydroxide on the carrier or the sacrificial template; and carrying out heat treatment on the Pt-XY hydroxide in a reducing atmosphere to form the Pt-XY alloy catalyst supported on the carrier or the sacrificial template. The dispersity and the performanceof the metal particles are improved.

Description

technical field [0001] The invention relates to the technical field of energy catalysis and nanometer materials, in particular to a method for preparing a Pt-based multi-element alloy nanometer electrocatalyst. Background technique [0002] Pt-based electrocatalysts are widely used in fuel cells, solid electrolyte water electrolysis, petrochemical and other fields, especially in the field of fuel cells. However, due to the scarcity and high price of platinum resources, the cost of fuel cells remains high, which has become one of the main obstacles to the commercialization of fuel cells. In order to reduce the cost of the catalyst and improve the catalytic performance, the use of other metal elements to form alloy catalysts with Pt has become a current research hotspot. Such catalysts can not only change the geometric distribution of Pt, such as reducing the Pt-Pt bond distance, but also change the related electronic structure, such as the d electron vacancies of Pt, thereby...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J23/652B01J23/68B01J23/89B01J35/02B01J35/00
CPCB01J23/8913B01J23/892B01J23/8906B01J23/8926B01J23/6522B01J23/685B01J23/894B01J23/63B01J35/33B01J35/50
Inventor 马玉南邹亮亮许翔刘得友
Owner 宁波中科科创新能源科技有限公司
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