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A kind of ptco/c electrocatalyst and preparation method thereof

An electrocatalyst and catalyst technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems affecting the uniformity of catalysts, the dispersion, uniformity and fineness of carbon black particles, and achieve good oxygen reduction reaction catalytic performance and uniform particle size. , the effect of small particle size

Active Publication Date: 2022-07-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional method of dispersing carbon support is to directly dissolve the carbon support powder in a solvent, and perform ultrasonic vibration outside the container to obtain an ink slurry, and then proceed to the next catalyst preparation. In fact, a large amount of solid carbon support will be agglomerated, only Ultrasonic vibration in a solvent is not enough to disperse the carbon black particles to a sufficiently uniform and fine size, which will affect the uniformity of the catalyst itself

Method used

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  • A kind of ptco/c electrocatalyst and preparation method thereof
  • A kind of ptco/c electrocatalyst and preparation method thereof
  • A kind of ptco/c electrocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Pt 3 Co / C catalyst (Pt:Co molar ratio 3:1, the mass accounts for 30% of the total catalyst mass), weigh the treated carbon powder slurry equivalent to 0.35g vulcan XC-72 carbon powder, and sequentially add 0.7g NaCO 3 Adjust pH, slowly drop 7ml of chloroplatinic acid solution, 1.5ml of cobalt chloride solution and prepared 1.5g of formaldehyde solution (preparation method: every 1ml of formaldehyde solution is diluted with 14ml of deionized water) into the slurry sequentially under magnetic stirring, And evenly stirring, control the reaction temperature above 90 ℃ reaction. After filtering, cleaning and heat treatment, 30% Pt was obtained 3 Co / C catalyst, the catalyst is tested by XRD, such as figure 1 shown, figure 2 TEM image of the PtCo / C electrocatalyst. It can be seen that the catalyst Pt particles are uniform in size, well dispersed, and basically have no cohesion phenomenon. The average particle size of the particles is 5 nm. The calculated proportion of cob...

Embodiment 2

[0033] Change the molar ratio of Pt and Co in Example 1 to prepare Pt 2 Co / C catalyst (Pt:Co molar ratio 2:1, the mass accounts for 30% of the total mass of the catalyst), weigh the treated carbon powder slurry equivalent to 0.35g Ketjen black carbon powder, and sequentially add 0.7g NaHCO according to the above steps 3 Adjust pH, under magnetic stirring, slowly drop 6ml of platinum acetylacetonate solution, 1.5ml of cobalt acetylacetonate solution and prepared 0.5g of ethylene glycol solution into the slurry in sequence, and stir evenly, and control the reaction temperature to react above 90°C. After filtering, cleaning and heat treatment, 30% Pt was obtained 2 Co / C catalyst, take the catalyst for XRD test ( figure 1 ), image 3 It is the TEM image of the PtCo / C electrocatalyst. It can be seen that the catalyst Pt particles are uniform in size, well dispersed, and basically have no unity phenomenon. The average particle size of the particles is 4.2 nm, and the alloying rate...

Embodiment 3

[0035] Change the molar ratio of Pt and Co in Example 1 to prepare a PtCo / C catalyst (the molar ratio of Pt:Co is 1:1, and the mass accounts for 30% of the total mass of the catalyst), and weigh the treated carbon equivalent to 0.35g of carbon nanotubes. Powder slurry, add 0.8g NaHCO in turn according to the above steps 3 Adjust pH, under magnetic stirring, slowly drop 5.5 ml of chloroplatinic acid solution, 3 ml of cobalt nitrate solution and prepared 1.5 g of ethylene glycol solution into the slurry in sequence, and stir evenly, and control the reaction temperature to react above 90 °C. After filtering, washing and heat treatment, a 30% PtCo / C catalyst was obtained. Take the catalyst for XRD test ( figure 1 ), Figure 4 It is the TEM image of the PtCo / C electrocatalyst. It can be seen that the catalyst Pt particles are uniform in size, well dispersed, and there is basically no unity phenomenon. The average particle size of the particles is 3.7 nm, and the alloying rate bas...

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Abstract

The invention relates to a PtCo / C electrocatalyst and a preparation method thereof. The catalyst carrier is carbon black material, the active component is Pt or soluble Pt, the auxiliary agent is the soluble inorganic salt of Co, and the Pt accounts for 30-50% of the total mass of the catalyst. , the molar ratio of Pt and Co is 3-1:1, and the preparation method is as follows: adding the active component precursor and auxiliary agent precursor into the carrier step by step, reducing the active component by a reducing agent, filtering, washing, Precipitation, drying, grinding, and then the obtained powder is further reduced by using a reducing gas under high temperature conditions to further reduce the auxiliary precursor to obtain a product. The invention adopts the water-phase dispersion mixing preparation method and the high-temperature gas reduction method, uses a reducing agent to reduce the metal Pt and Co from the precursor, and supports it on the carrier carbon black material, which can be used for industrialized large-scale preparation, and the prepared catalyst particles are evenly distributed. , small size, high catalytic activity of oxygen reduction reaction, simple operation and low preparation temperature.

Description

technical field [0001] The present invention relates to the technical field of fuel cell technology and new energy materials, in particular to a PtCo / C electrocatalyst and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cell (PEMFC), as an environmentally friendly energy source, has attracted the attention of academia and industry all over the world in the current situation of depletion of petroleum resources. Catalyst is the key material of PEMFC. The catalytic efficiency of the catalyst determines the reaction rate of the electrode, which also determines the efficiency of the fuel cell. At the same time, it plays an important role in reducing the cost of the fuel cell and improving its durability. The research and development of alloy catalyst carrier dispersion and optimization of chemical synthesis steps to prepare catalyst are the key technologies to improve its performance and durability, so that this catalyst preparation metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/90H01M4/92H01M4/88
CPCH01M4/8825H01M4/9041H01M4/9083H01M4/926Y02E60/50
Inventor 林瑞闫海旭
Owner TONGJI UNIV
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