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Preparation method and application of a porous carbon-coated PdFe/C alloy nano-frame

A technology of alloying nanometer and porous carbon, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as hindering active sites, reducing catalytic performance, reducing mass transfer rate, etc. Aggregation and dissolution, enhanced electrocatalytic activity, and favorable effects on graphitization degree

Inactive Publication Date: 2020-01-24
SOUTHEAST UNIV
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Problems solved by technology

However, the existence of the protective layer will also hinder the active sites to a certain extent, reduce the mass transfer rate, and thus reduce the catalytic performance.
Therefore, the coated protective shell needs to be thin enough to not hinder the active site, which is a very delicate and difficult to control process

Method used

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  • Preparation method and application of a porous carbon-coated PdFe/C alloy nano-frame
  • Preparation method and application of a porous carbon-coated PdFe/C alloy nano-frame
  • Preparation method and application of a porous carbon-coated PdFe/C alloy nano-frame

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preparation example Construction

[0033] More specifically, the preparation method of the porous carbon-coated PdFe / C alloy nanoframe of the present invention specifically includes the following steps:

[0034] 1) Synthesis of yellow sheet-like Pd(II)-naphthylamine complex: take a certain amount of naphthylamine (C 10 h 9 N), dissolved in ethanol, added PdCl 2 Aqueous solution, fully ultrasonically mixed, after standing still, a yellow flaky Pd(II)-naphthylamine complex precipitate can be obtained, and the supernatant is removed by centrifugation;

[0035] 2) Synthesis of yellow-green flaky Pd(II) / Fe(III)-naphthylamine complex: place the obtained yellow precipitate in FeCl 3 In the mixed solution of water and ethanol, after sufficient ultrasonic dispersion, stir overnight, so that the 1-naphthylamine molecule on the surface of the sheet-like Pd(II)-naphthylamine complex fully adsorbs Fe(III), and centrifugal drying;

[0036] 3) Preparation of porous carbon-coated PdFe / C alloy nanoframes: heat the yellow-gre...

Embodiment 1

[0046] The preparation method of porous carbon coated PdFe / C alloy nano-frame, comprises the following steps:

[0047] 1) Preparation of yellow flaky Pd(II)-naphthylamine complex: take 286mg naphthylamine (C 10 h 9 N) Dissolved in 4mL of ethanol, fully ultrasonicated to dissolve; add 4mL 0.05mol L -1 PdCl 2 Aqueous solution, after standing still, yellow flake Pd(II)-naphthylamine complex can be obtained, which is centrifuged and dried;

[0048] 2) Synthesis of yellow-green flaky Pd(II) / Fe(III)-naphthylamine complex: place the resulting yellow precipitate in 4mL0.05mol L -1 FeCl 3 In a mixed solution with a water-ethanol volume ratio of 1:1, after fully ultrasonically dispersed, stir for 24 hours, so that the 1-naphthylamine molecules on the surface of the flaky Pd(II)-naphthylamine complex can fully absorb Fe(III) , centrifugal drying;

[0049] 3) Preparation of porous carbon-coated PdFe / C alloy nanoframes: the yellow-green powder obtained in step 2) was prepared in a ni...

Embodiment 2

[0051] The preparation method of porous carbon coated PdFe / C alloy nano-frame, comprises the following steps:

[0052] 1) Preparation of yellow flaky Pd(II)-naphthylamine complex: Weigh 0.286mg naphthylamine (C 10 h 9 N) Dissolved in 4mL of ethanol, fully ultrasonicated to dissolve; add 4mL 0.05mol L -1 PdCl 2 Aqueous solution, after standing still, yellow flake Pd(II)-naphthylamine complex can be obtained, which is centrifuged and dried;

[0053] 2) Synthesis of yellow-green flaky Pd(II) / Fe(III)-naphthylamine complex: place the resulting yellow precipitate in 4mL0.05mol L -1 FeCl 3 In a mixed solution with a water-ethanol volume ratio of 1:1, after fully ultrasonically dispersed, stir for 24 hours, so that the 1-naphthylamine molecules on the surface of the flaky Pd(II)-naphthylamine complex can fully absorb Fe(III) , centrifugal drying;

[0054] 3) Preparation of porous carbon-coated PdFe / C alloy nanoframes: the yellow-green powder obtained in step 2) was prepared in a...

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Abstract

The invention relates to a preparation method and application of a porous carbon coated PdFe / C alloy nano-frame. According to the preparation method, 1-naphthylamine (C10H9N), adopted as a coordination agent, forms a Pd(II)-(C10H7-NH2) flaky yellow precipitate complex with PdCl2; the Pd(II)-(C10H7-NH2) flaky yellow precipitate complex is arranged in an aqueous solution of FeCl3 so as to be subjected to ultrasonic mixing; an obtained mixture is stirred for a long time, so that Fe<3+> can be fully adsorbed on the surface of the flaky precipitate, and an obtained Pd(II) / Fe(III)-(C10H7-NH2) flakyyellow-green precipitate is arranged in an inert atmosphere so as to be subjected to high-temperature heat treatment, so that the porous carbon coated PdFe / C alloy nano-frame can be obtained. The porous carbon coated PdFe / C alloy nano-frame prepared by the method has the advantages of ultrafine particle size of PdFe alloy, adjustable compositions, high electrochemical activity, high stability, simple preparation process, convenience in batch production, environmental friendliness and the like. The porous carbon coated PdFe / C alloy nano-frame shows higher electrocatalytic activity and stabilitywhen being used as a cathode oxygen reduction catalyst under an acidic condition.

Description

technical field [0001] The invention relates to a preparation method of a porous carbon-coated PdFe / C alloy nanoframe with high electrochemical activity and stability, and the catalyst is suitable for efficient electrocatalysis of cathode oxygen reduction in acidic electrolytes. Background technique [0002] Energy shortage and environmental pollution have attracted great attention in today's society, and the development of renewable clean energy power generation and electric vehicle industry has important strategic significance. Low-temperature polymer electrolyte membrane fuel cells and metal-air batteries are expected to form efficient and clean energy storage and conversion systems due to their high energy conversion efficiency, low pollution, safety, and low cost. Oxygen reduction reaction (ORR) is an important cathode reaction in fuel cells and metal-air batteries. Currently, the commonly used ORR catalysts are noble metal Pt-based catalysts, which account for about 5...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9041H01M4/9083H01M4/926H01M2004/8689Y02E60/50
Inventor 周建成江娴李乃旭葛阳付更涛唐亚文
Owner SOUTHEAST UNIV
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