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Surface gold-modified high-loading-capacity carbon-loaded platinum-cobalt catalyst as well as preparation method and application thereof

A technology of cobalt catalyst and carbon-supported platinum, which is applied in nanotechnology for materials and surface science, electrochemical generators, fuel cells, etc., can solve the problems of stable MA attenuation and cumbersome process, and achieve improved stability, The effect of simple process and close contact with each other

Active Publication Date: 2020-06-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared by this preparation method has relatively high initial activity, but the stability of 4000 cycles shows obvious MA decay
And due to the limitation of the metal loading in a single preparation of the vapor phase impregnation reduction method, if a catalyst with a higher loading is to be prepared, the process will become more cumbersome

Method used

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  • Surface gold-modified high-loading-capacity carbon-loaded platinum-cobalt catalyst as well as preparation method and application thereof
  • Surface gold-modified high-loading-capacity carbon-loaded platinum-cobalt catalyst as well as preparation method and application thereof
  • Surface gold-modified high-loading-capacity carbon-loaded platinum-cobalt catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The surface gold-modified high-capacity carbon-supported platinum-cobalt catalyst of this embodiment includes a carbon support and gold-platinum-cobalt particles on it. The particle size of the particles is 2 to 5 nm. The particles have a Pt-rich surface, Co is distributed inside the particles, and Au Distributed on the particle surface, and the Pt loading in the catalyst is 50.2wt.%.

[0049] The preparation method of the catalyst in this example is as follows: take a three-necked round-bottomed flask with a capacity of 500 mL, wash and dry it for later use. Measure 175mL of ethylene glycol with a graduated cylinder and pour it into the flask, then add 14.48mL of chloroplatinic acid solution (38.6mM) prepared in advance. Weigh 123mg of cobalt chloride hexahydrate with an electronic balance, dissolve it in 10mL of ethylene glycol, and transfer the cobalt chloride solution to the flask after ultrasonic dissolution, then weigh 80mg of conductive carbon black (EC300) with ...

Embodiment 2

[0071] The surface gold-modified high-capacity carbon-supported platinum-cobalt catalyst of this embodiment includes a carbon support and gold-platinum-cobalt particles on it. The particle size of the particles is 2 to 5 nm. The particles have a Pt-rich surface, Co is distributed inside the particles, and Au Distributed on the particle surface, and the Pt loading in the catalyst is 60wt.%.

[0072] The preparation method of the catalyst in this example is as follows: take a three-necked round-bottomed flask with a capacity of 500 mL, wash and dry it for later use. Measure 175mL of ethylene glycol with a graduated cylinder and pour it into the flask, then add 15mL of chloroplatinic acid solution (38.6mM) prepared in advance. Weigh 128mg of cobalt chloride hexahydrate with an electronic balance, dissolve it in 10mL of ethylene glycol, transfer the cobalt chloride solution to the flask after ultrasonic dissolution, then weigh 60mg of conductive carbon black (EC300) with an electr...

Embodiment 3

[0075] The surface gold-modified high-capacity carbon-supported platinum-cobalt catalyst of this embodiment includes a carbon support and gold-platinum-cobalt particles on it. The particle size of the particles is 2 to 5 nm. The particles have a Pt-rich surface, Co is distributed inside the particles, and Au Distributed on the particle surface, and the Pt loading in the catalyst is 55.6wt.%.

[0076] The preparation method of the catalyst in this example is as follows: take a three-necked round-bottomed flask with a capacity of 500 mL, wash and dry it for later use. Use a graduated cylinder to measure 175mL of ethylene glycol and pour it into the flask, then add 12.4mL of a pre-prepared chloroplatinic acid solution (38.6mM). Weigh 105mg of cobalt chloride hexahydrate with an electronic balance, dissolve it in 10mL of ethylene glycol, and transfer the cobalt chloride solution to the flask after ultrasonic dissolution, then weigh 55mg of conductive carbon black (EC300) with an e...

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Abstract

The invention discloses a surface gold-modified high-loading-capacity carbon-loaded platinum-cobalt catalyst as well as a preparation method and application thereof. The catalyst comprises a carbon carrier and an active substance, the active substance is gold-platinum-cobalt nanoparticles, the particle size of the particles is 2-5 nm, Au is distributed on the surfaces of the particles, Co is distributed in the particles, and the Pt loading capacity in the catalyst is 50-60 wt.%. The catalyst is prepared by adopting a method of ethylene glycol reduction and one-step addition of a dilute nitricacid solution containing potassium chloroaurate. The catalyst prepared in the invention has the advantages of uniform particle distribution, reasonable structure, and high initial activity and stability.

Description

technical field [0001] The invention relates to a catalyst and its preparation method and application, in particular to a surface gold-modified high-capacity carbon-supported platinum-cobalt catalyst as well as its preparation method and application. Background technique [0002] The PtCo system is considered to be one of the most promising cathode catalysts for proton exchange membrane fuel cells. However, the stability of PtCo system catalysts is still poor, and most of the PtCo system catalysts prepared in the reported work have low Pt loading. [0003] In order to solve the problem of poor stability faced by the PtCo system, many studies have been devoted to reducing the dissolution of Co and limiting the rearrangement and particle aggregation of Pt in the electrochemical process; the corresponding solution in the prior art is mainly to use high-temperature heat treatment (above 600 ° C) To form an ordered alloy structure, forming intermetallic compounds. [0004] On t...

Claims

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Application Information

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IPC IPC(8): H01M4/92B82Y30/00H01M8/10
CPCH01M4/921H01M4/926B82Y30/00H01M2008/1095Y02E60/50
Inventor 刘建国王烽李佳
Owner NANJING UNIV
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