PtCo/C electric catalyst and preparation method thereof

An electrocatalyst and catalyst technology, applied in circuits, electrical components, battery electrodes, etc., can solve the problems of uniformity and smallness, affecting the uniformity of catalysts, and dispersion of carbon black particles, achieving small particle size, uniform distribution of catalyst particles, and preparation of low temperature effect

Active Publication Date: 2018-11-27
TONGJI UNIV
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  • 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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  • PtCo/C electric catalyst and preparation method thereof
  • PtCo/C electric catalyst and preparation method thereof
  • PtCo/C electric catalyst 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, mass accounts for 30% of the total mass of the catalyst), weigh the treated carbon powder slurry equivalent to 0.35g vulcan XC-72 carbon powder, add 0.7gNaCO 3 Adjust the pH, slowly drop 7ml of chloroplatinic acid solution, 1.5ml of cobalt chloride solution and prepared 1.5g of formaldehyde solution (preparation method: dilute with 14ml of deionized water per 1ml of formaldehyde solution) into the slurry in sequence under magnetic stirring, Stir evenly, and control the reaction temperature to react above 90°C. After filtration, cleaning and heat treatment, 30% Pt 3 Co / C catalyst, XRD test for catalyst, such as figure 1 as shown, figure 2 It is the TEM image of the PtCo / C electrocatalyst. It can be seen that the particle size of the catalyst Pt is uniform, well dispersed, and there is basically no solidification phenomenon. The average particle size of the particles is 5nm. The calculation shows that the cobalt element acco...

Embodiment 2

[0033] Change Pt and Co mol ratio among the embodiment 1, prepare Pt 2 Co / C catalyst (Pt:Co molar ratio 2:1, mass accounts for 30% of the total catalyst mass), weigh the treated carbon powder slurry equivalent to 0.35g Ketjen black carbon powder, add 0.7g NaHCO in sequence according to the above steps 3 Adjust the pH, 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 turn under magnetic stirring, and stir evenly to control the reaction temperature above 90°C. After filtration, cleaning and heat treatment, 30% Pt 2 Co / C catalyst, get catalyst and carry out XRD test ( figure 1 ), image 3 It is the TEM image of the PtCo / C electrocatalyst. It can be seen that the Pt particles of the catalyst are uniform in size, well dispersed, and there is basically no solidification phenomenon. 32.01%, the theoretical ratio is 33.3%.

Embodiment 3

[0035] Change the Pt and Co molar ratio in Example 1 to prepare a PtCo / C catalyst (Pt: Co molar ratio 1:1, 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 successively according to the above steps 3 Adjust the pH, slowly drop 5.5ml of chloroplatinic acid solution, 3ml of cobalt nitrate solution and the prepared 1.5g of ethylene glycol solution into the slurry under magnetic stirring, and stir evenly to control the reaction temperature above 90°C. After filtration, washing and heat treatment, a 30% PtCo / C catalyst was obtained. Get catalyst and carry out XRD test ( figure 1 ), Figure 4 It is the TEM image of the PtCo / C electrocatalyst. It can be seen that the Pt particles of the catalyst are uniform in size, well dispersed, and there is basically no solidification phenomenon. 49.4%, the theoretical proportion is 50%.

[0036] Table 1 shows the mass specific acti...

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Abstract

The invention relates to a PtCo / C electric catalyst and a preparation method thereof. A catalyst vector is a carbon black material, the active component is Pt or soluble Pt, an auxiliary agent is soluble inorganic salt of Co, Pt accounts for 30-50% of the catalyst in total mass, and the molar ratio of Pt and Co is (3-1): 1. The preparation method comprises the following steps: adding the active component precursor and an auxiliary agent precursor into a vector in steps; reducing the active component through a reducer; carrying out filtration, washing, precipitation, drying and grinding; and further reducing the auxiliary agent precursor in the obtained powder with reducing gas in a high temperature condition to obtain a product. By adopting a water phase dispersing and mixing preparation method and a high temperature gas reducing method, metals Pt and Co are reduced from the precursor by means of the reducer and are loaded to the vector carbon black material, so that the catalyst can be prepared industrially on a large scale. The prepared catalyst has the characteristics of being uniform in particle distribution, small in size, high in catalytic activity on oxygen reducing reactionand the like, and is easy to operate and low in preparation temperature.

Description

technical field [0001] The invention relates to the technical fields 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 academic and industrial circles all over the world under the situation of increasingly depleted 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 a non-negligible role in reducing the cost of the fuel cell and improving its durability. The research and development of dispersed alloy catalyst supports and the optimization of chemical synthesis steps to prepare catalysts are the key technologies to improve their performance and durability, make this catalyst pr...

Claims

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Application Information

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Patent Type & Authority Applications(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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