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Noble-metal/composite metal oxide/ carbon nanometer tubular electro-catalyst and preparation method and application

A carbon nanotube and composite metal technology is applied in the field of noble metal/composite metal oxide/carbon nanotube type electrocatalyst and its preparation, and achieves the effects of uniform particle size, good crystallinity, and overcoming the inability to uniformly disperse

Inactive Publication Date: 2010-08-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The active components of the catalyst used in CCVD are mainly transition metals Ni, Fe, Co (Wei-Wei Pang, Seongyop Lim, Yu-ZhenZhang, Seong-Ho Yoon, and Isao Mochida, J.Phys.Chem.C, 2008, 112 (27), 10050-10060); and there are also literature reports on the catalytic activity of noble metals for growing carbon nanotubes, using noble metal Pt as a catalyst to grow a series of carbon nanotubes, but relatively speaking, the uniformity and Dispersion needs to be improved (Sakae Takenaka, Toshiyuki Iguchia, Eishi Tanabe, Hideki Matsune, Masahiro Kishida, Ccarbon, 47(2009) 1251-1257)

Method used

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  • Noble-metal/composite metal oxide/ carbon nanometer tubular electro-catalyst and preparation method and application
  • Noble-metal/composite metal oxide/ carbon nanometer tubular electro-catalyst and preparation method and application
  • Noble-metal/composite metal oxide/ carbon nanometer tubular electro-catalyst and preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Will K 2 PtCl 4 2H 2 O, NiSO 4 ·6H 2 O, MgCl 2 ·6H 2 O and Al(NO 3 ) 3 ·7H 2 O was dissolved in 80ml deionized water to prepare a salt solution, in which Pt 2+ The molar concentration is 0.08mol / L, Ni 2+ The molar concentration is 0.3mol / L, Mg 2+ The molar concentration of Al is 0.6mol / L, Al 3+ The molar concentration is 0.3mol / L;

[0030] Add urea to the salt solution to make a mixed solution, so that the molar concentration ratio of urea and all metal cations is 5:1.

[0031] Put this mixed solution into a 100ml polytetrafluoroethylene resin liner, place it in a reactor to seal it, put it into an oven at 150° C. to crystallize for 36 hours, and finally take out the liner. After the reaction was completed, it was suction filtered, washed twice with deionized water, and dried at 60° C. for 10 hours.

[0032] Put 150 mg of the layered double metal hydroxide prepared above into a porcelain boat, put it into a tubular heating furnace, pass in nitrogen gas (70...

Embodiment 2

[0035] Will K 2 PtCl 4 2H 2 O, Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 ·7H 2 O was dissolved in 80ml deionized water to prepare a salt solution, in which Pt 2+ The molar concentration is 0.04mol / L, Mg 2+ The molar concentration is 0.3mol / L, Al 3+ The molar concentration is 0.1mol / L;

[0036] Add appropriate urea to the salt solution to make a mixed solution, the molar concentration ratio of urea and all metal cations is 3.

[0037] Put this mixed solution into a 100ml polytetrafluoroethylene resin liner, place it in a reactor to seal it, put it into an oven at 180° C. for crystallization for 36 hours, and finally take out the liner. After the reaction was completed, it was filtered with suction, washed twice with deionized water, and dried at 75° C. for 15 hours.

[0038] Put 150 mg of the layered double metal hydroxide prepared above into a porcelain boat, put it into a tubular heating furnace, pass in nitrogen gas (70ml / min), raise the temperature to 600°C at a rate ...

Embodiment 3

[0041] Na 2 PdCl 4 2H 2 O, Co(NO 3 ) 3 ·6H 2 O and Fe(NO 3 ) 3 ·7H 2 O was dissolved in 80ml deionized water to prepare a salt solution, in which Pd 2+ The molar concentration is 0.04mol / L, Co 2+ The molar concentration of Fe is 0.4mol / L, Fe 3+ The molar concentration is 0.1mol / L;

[0042] Add appropriate urea to the salt solution to make a mixed solution, the molar concentration ratio of urea and all metal cations is 4.

[0043] Put this mixed solution into a 100ml polytetrafluoroethylene resin liner, place it in a reactor to seal it, put it into an oven at 150° C. to crystallize for 36 hours, and finally take out the liner. After the reaction was completed, it was suction filtered, washed twice with deionized water, and dried at 70° C. for 10 hours.

[0044] Put 100 mg of the layered double metal hydroxide prepared above into a porcelain boat and put it into a tubular heating furnace, feed nitrogen gas (60ml / min), raise the temperature to 700°C at a rate of 10°C / ...

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Abstract

The invention provides a noble-metal / composite metal oxide / carbon nanometer tubular electro-catalyst and a preparation method and an application thereof, which belong to the technical field of the nanometer composite material, and are characterized in that: by utilizing the controllability of the hydrotalcite slab composition and the designability of the structure, Pt2+, Pd2+ and Ni2+, Co2+, Mg2+, Al3+ and Fe3+ ions are introduced into the slab so as to synthesize a layered dual-metal hydroxide precursor containing the noble metal elements. The Pt2+ and Pd2+ can be highly scattered and uniformly distributed on the molecule level, and the Pt2+ and Pd2+ can be used as a catalyst after being reduced to catalyze the growth of the carbon nanometer tube loading the noble metal particles and the composite electro-catalyst which is highly doped with the composite metal oxide. The method not only can effectively disperse the noble metal catalyst and controls the growth of the noble metal catalyst on the carbon nanometer tube and the composite metal oxide, but also strengthens the electro-catalyzing property of the noble metal which is loaded in the carbon nanometer tube and the composite metal oxide network matrix. The electro-catalyst is used as an electrode in the alcohol fuel battery, the specific activity of the electro-catalyst on the maximum peak value of the alcohol oxidation can reach 120 to 200 mA.mg-1. The preparation method realizes the integration, has simple operation, is free from the environmental pollution, and is applicable to the industrialization process.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocomposite materials, and in particular relates to a noble metal / composite metal oxide / carbon nanotube electrocatalyst and a preparation method thereof. Background technique [0002] In recent years, the research and development of nanocomposites (Nanocomposites) is relatively rapid. Due to the nanoscale effect, large specific surface area, strong interfacial interaction and unique physical-chemical properties of the dispersed phase of nanocomposites, it has greater advantages compared with conventional composites. Nanocomposite materials combine the properties of two or more substances to produce many specific properties, showing broad application prospects in electronics, optics, mechanics, biology and other fields. Among them, carbon nanotubes are excellent candidates for reinforcing materials in composite materials, and become carbon nanotube-based nanocomposites. This kind of comp...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90B01J23/89B01J23/42B01J23/44
CPCY02E60/50
Inventor 李峰张璐
Owner BEIJING UNIV OF CHEM TECH
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