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Fuel cell catalyst with gold nanocluster as core and platinum as shell, preparation method and application thereof

A fuel cell and nano-cluster technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of precious metal shedding, high platinum loading, high cost, etc., to reduce agglomeration and dissolution, reduce loading, and save costs Effect

Active Publication Date: 2021-05-28
NINGXIA RISHNEG HIGH NEW IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the platinum loading of PtRu / C and Pt / C catalysts is high, and the cost is very high, and the current core-shell structure catalyst uses carbon black as a carrier, and the carbon carrier is easily corroded in the operating environment of the fuel cell, resulting in the loss of the load. The detachment and migration of precious metals will bring about the stability and durability of the catalyst

Method used

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  • Fuel cell catalyst with gold nanocluster as core and platinum as shell, preparation method and application thereof
  • Fuel cell catalyst with gold nanocluster as core and platinum as shell, preparation method and application thereof
  • Fuel cell catalyst with gold nanocluster as core and platinum as shell, preparation method and application thereof

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preparation example Construction

[0033] A method for preparing a fuel cell catalyst of the present invention comprises the following steps: (1) loading MPA-Au nanoclusters onto acidified carbon nanotubes to obtain Au-MPA / CNTs; (2) adding Au-

[0034] MPA / CNTs were dispersed in 0.2%-0.3% nafion ethanol solution, dropped onto the electrode, and air-dried; (3) Pulse electrodeposited platinum to obtain Au-MPA / CNTs@Pt fuel cell catalyst.

[0035] Preferably, the pulse electrodeposition of platinum is: 6500-7500 cycles of pulse electrodeposition of platinum. Among them, when depositing platinum on Au-MPA / CNTs, as the number of deposition cycles increases, the deposited platinum will gradually increase. The number of deposition circles is small, the platinum content is also small, and the activity is relatively low. The catalytic activity is the best when the number of circles increases to 6500-7500, but when the number of circles continues to increase, the deposition layer becomes thicker, which weakens the intera...

Embodiment 1

[0046] This embodiment provides a preparation method of Au-MPA / CNTs@Pt, specifically as follows:

[0047] (1) Take 0.25mL of 0.02M HAuCl 4 The solution and 2 mL of 0.005M 3-mercaptopropionic acid (MPA) were added to 2.35 mL of water to form the MPA-Au complex.

[0048] (2) Add 0.1 mL of NaBH to the above MPA-Au complex 4 Mixed solution with NaOH (43mg NaBH 4 The powder was prepared by dissolving in 10mL of 0.2mL NaOH), and stirred at 600-800r / min for 3 hours to collect MPA-Au nanoclusters (MPA-Au NCs).

[0049] (3) Take carbon nanotubes (CNTs) and add them to a mixed solution of concentrated sulfuric acid and concentrated nitric acid with a volume ratio of 1:3, specifically: 1 g of untreated carbon nanotubes is refluxed and stirred in 25 mL of concentrated sulfuric acid and 75 mL of concentrated nitric acid for 60 ℃ reflux for 6 hours, then washed with water, centrifuged and dried to obtain acidified carbon nanotubes.

[0050] Wherein, the surface of the carbon nanotubes i...

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Abstract

The invention provides a fuel cell catalyst with gold nano-clusters as the core and platinum as the shell and its preparation method and application. The nano-gold clusters are prepared by a simple one-step method and loaded on acidified carbon nanotube carriers. Au‑MPA / CNTs were obtained, and with this as the core, the pulse electrodeposited platinum was coated on the nano-gold clusters with a layer of platinum as the shell, and a fuel cell electrode catalyst with a core-shell structure was prepared. Under the premise of ensuring the electrocatalytic performance , the load of the precious metal platinum is reduced, the cost is saved, and the problem that the precious metal is easy to fall off is avoided, so that the prepared fuel cell catalyst has high stability and is more durable.

Description

technical field [0001] The invention relates to the field of fuel cell catalysts, in particular to a fuel cell catalyst with gold nanoclusters as the core and platinum as the shell, and a preparation method and application thereof. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy through an electrochemical reaction. It is mainly composed of positive electrode, negative electrode, electrolyte and auxiliary equipment. A proton exchange membrane fuel cell that directly uses methanol as fuel is commonly referred to as a direct methanol fuel cell (DMFC). Membrane electrode is mainly composed of methanol anode, oxygen cathode and proton exchange membrane (PEM). The anode and cathode are composed of stainless steel plate, plastic film, copper current collecting plate, graphite, gas diffusion layer and catalytic layer with porous structure. Among them, the gas diffusion lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/92
CPCH01M4/8657H01M4/8878H01M4/926Y02E60/50
Inventor 郑育英何佩珊张健方岩雄刘全兵
Owner NINGXIA RISHNEG HIGH NEW IND CO LTD