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High-efficiency doping method of doped NbOx platinum-based catalyst used for fuel cell catalysts

A fuel cell and catalyst technology is applied in the field of preparation of doped NbOx powder, which can solve the problems of poor catalytic activity and low oxide conductivity, and achieve the effects of improving catalytic activity, simple process and low price.

Active Publication Date: 2017-01-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the invention is to solve the existing NbO x The problems of low conductivity and poor catalytic activity of oxides provide a fuel cell catalyst with doped NbO x Efficient doping method for platinum-based catalysts

Method used

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  • High-efficiency doping method of doped NbOx platinum-based catalyst used for fuel cell catalysts
  • High-efficiency doping method of doped NbOx platinum-based catalyst used for fuel cell catalysts
  • High-efficiency doping method of doped NbOx platinum-based catalyst used for fuel cell catalysts

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specific Embodiment approach 1

[0044] Embodiment 1: This embodiment is a doped NbO catalyst for a fuel cell x Efficient doping of platinum-based catalysts is accomplished in the following steps:

[0045] 1. Preparation of precursor:

[0046] ①. Drop the alkaline solution into the niobium salt alcohol solution at a rate of 12 drops / min to 60 drops / min to obtain the precipitated substance A; centrifuge the precipitated substance A at a centrifugal speed of 6500r / min to 9000r / min After 5min to 10min, discard the supernatant to obtain the precipitated substance A after centrifugation; wash the precipitated substance A after centrifugation with distilled water for 3 to 5 times to obtain the precipitated substance A after washing;

[0047] Step one 1. the volume ratio of described alkaline solution and niobium salt alcohol solution is (20~50):1;

[0048] The alkaline solution described in step one ① is a sodium hydroxide solution with a concentration of 0.3mol / L~0.5mol / L, an ammonia solution with a concentratio...

specific Embodiment approach 2

[0078] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the alkaline solution described in step 1. is a sodium hydroxide solution with a concentration of 0.3mol / L, an ammonia solution with a concentration of 0.3mol / L, and a concentration of 0.3mol / L. 0.3mol / L sodium carbonate solution or 0.3mol / L sodium bicarbonate solution. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0079] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the concentration of niobium salt in the niobium salt alcohol solution described in step 1 is 1 mol / L. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a high-efficiency doping method of a doped NbOx platinum-based catalyst used for fuel cell catalysts, and relates to a preparation method of doped NbOx powder. The purpose of the invention is to solve the problems of low conductivity and poor catalysis activity of present NbOx oxides. The method comprises the following steps: 1, preparing a precursor; 2, roasting; 3, doping; and 4, adjusting the pH value of a reaction solution III, carrying out suction filtration, cleaning, and drying to obtain the doped NbOx platinum-based catalyst used for fuel cell catalysts. The half-wave potential of the doped NbOx platinum-based catalyst used for fuel cell catalysts, prepared in the invention, is 0.79-0.86 V, and is more positive than that of a carbon supported platinum catalyst, and the mass activity of the doped NbOx platinum-based catalyst is high, can reach 173.44 mAmgPt<-1> and is 2.96-5.3 times higher than that of the carbon supported platinum catalyst. The doped NbOx platinum-based catalyst used for fuel cell catalysts can be obtained through the high-efficiency doping method.

Description

technical field [0001] The invention relates to a doped NbO x Powder preparation method. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is considered to be one of the fuel cells with the most potential for development due to its characteristics of rapid start-up at low temperature, high energy conversion efficiency, and zero-pollution emission. This is of great significance to alleviating the current energy crisis and solving environmental problems. However, since the main material of the catalyst is Pt, its manufacturing cost is increased, which is also the fundamental reason hindering its commercialization. At this stage, improving the activity of platinum cathode catalysts and their stability under strong acidic high potential is crucial to solve the cost and life of catalysts and batteries. In recent years, the use of metal oxides as catalyst supports has attracted widespread attention, among which NbO x It has the ability to resist chemical...

Claims

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Application Information

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IPC IPC(8): B01J23/648B01J27/24H01M4/92
CPCY02E60/50
Inventor 尹鸽平孙薇杜春雨高云智左朋建杜磊孙佳
Owner HARBIN INST OF TECH
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