Preparation method of nano-palladium or palladium-nickel alloy catalyst having three-dimensional porous structure

An alloy catalyst and three-dimensional porous technology, applied in the field of electrochemistry, can solve the problems of complex template removal process and unfavorable reactant transport, and achieve the effect of easy preparation, low cost and low cost

Inactive Publication Date: 2013-02-13
FUDAN UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Among the many morphologies, porous catalysts have attracted widespread attention. Its synthesis methods mainly include dealloying and hard template method. Although the former can obtain catalysts with a larger specific surface, its uniform nanoscale pore structure It is not conducive to the transmission of reactants. Although the latter can better control parameters such as pore size, the process of removing templates is more complicated.

Method used

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  • Preparation method of nano-palladium or palladium-nickel alloy catalyst having three-dimensional porous structure
  • Preparation method of nano-palladium or palladium-nickel alloy catalyst having three-dimensional porous structure
  • Preparation method of nano-palladium or palladium-nickel alloy catalyst having three-dimensional porous structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Carry out pretreatment on the glassy carbon electrode, including polishing, ultrasonic, electrochemical cleaning, etc. The specific method is the same as step 1 of the comparative example.

[0035] 2. Prepare the solution required for electrodeposition, including 20 mM PdCl 2 , 0.5 M H 2 SO 4 , 0.1 M NH 4 Cl.

[0036] 3. Three-dimensional porous Pd was obtained by electrodeposition on an electrochemical workstation using a three-electrode system, and the specific conditions were deposition at a potential of -4 V for 60 s.

[0037] 4. The prepared catalyst was tested for the electrocatalytic oxidation of methanol.

[0038] 5. Result description:

[0039] (a) As can be seen from the schematic diagrams in Figure 1a1-Figure 1a3, through this simple method, we have obtained a Pd catalyst with a porous structure. Figure 1a1 shows that the catalyst has regular micron-scale pores, which are conducive to The transport of reactants reduces the diffusion effect; Figure 1a...

Embodiment 2

[0043] 1. Carry out pretreatment on the glassy carbon electrode, including polishing, ultrasonic, electrochemical cleaning, etc. The specific method is the same as step 1 of the comparative example.

[0044] 2. Prepare the solution required for electrodeposition, including 20 mM PdCl 2 , 0.1 M NiCl 2 , 0.5 M H 2 SO 4 , 0.1 M NH 4 Cl.

[0045] 3. Three-dimensional porous PdNi was obtained by electrodeposition on an electrochemical workstation with a three-electrode system, and the specific conditions were deposition at a potential of -4 V for 60 s.

[0046] 4. The prepared catalyst was tested for the electrocatalytic oxidation of methanol.

[0047] 5. Result description:

[0048] (a) It can be seen from the schematic diagrams in Figure 1b1-Figure 1b3 that through this simple method, we have obtained a PdNi catalyst with a porous structure. Compared with the catalyst, the pore wall is relatively rough; Figure 1b2 shows that the pore wall is composed of porous dendrite...

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Abstract

The invention belongs to the technical field of direct methanol fuel cells and discloses a preparation method of a nano-palladium or palladium-nickel alloy catalyst having a three-dimensional porous structure. The preparation method comprises carrying out cathode electrodeposition in a metal salt solution to obtain the nano-palladium or palladium-nickel alloy catalyst having a three-dimensional porous structure, wherein in the cathode electrodeposition, produced hydrogen bubbles are used as dynamic templates. The nano-palladium or palladium-nickel alloy catalyst obtained by the preparation method is a three-dimensional porous Pd or Pd-Ni alloy, has aperture walls composed of nanoscale dendritic crystals, has a large chemically active specific surface area, and has good catalytic activity and stability in electrocatalytic oxidation of methanol. The preparation method has simple processes, obvious effects and a wide application prospect in the field of anode catalysts of direct methanol fuel cells.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and specifically relates to a three The invention discloses a preparation method of nano-palladium or palladium-nickel alloy catalyst with three-dimensional porous structure. Background technique [0002] Direct methanol fuel cell is considered to be a promising portable power source due to its high energy density, simple structure, convenient operation, and environmental friendliness. However, to realize its practical application, it is necessary to design a low-cost and efficient anode catalyst. Among many catalysts, platinum-based catalysts have been the most widely studied due to their good performance in the electrooxidation of methanol, but platinum is expensive due to its limited reserves, and it is easily poisoned during the electrocatalysis process, so many People are researching to find non-platinum catalysts. Among them, the palladium-based catalyst is considered to be a go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/20C25C1/24C25D7/00B01J23/44B01J23/89
Inventor 余爱水李若诗黄桃
Owner FUDAN UNIV
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