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Pd-based passivation film with high catalytic activity and preparation method thereof

A technology with high catalytic activity and passivation film, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as poor catalytic stability, and achieve the effects of stable structure, high catalytic activity, and high cycle stability

Active Publication Date: 2019-08-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Technical problem: the purpose of the present invention is to provide a Pd-based passivation film with high catalytic activity and its preparation method. The method uses the stability of the passivation film to design and prepare a catalyst with high catalytic activity and high stability to solve the current problem. There are problems with poor catalytic stability of fuel cells

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  • Pd-based passivation film with high catalytic activity and preparation method thereof

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Embodiment 1

[0032] A kind of Pd base passivation film with high catalytic activity, this passivation film comprises following components according to atomic percentage:

[0033] Pd 90%,

[0034] Ni 10%.

[0035] in:

[0036] The passivation film had a surface roughness of 170 and a thickness of 500 nm.

[0037] Its preparation method comprises the following steps:

[0038] 1) Pd 20 Ni 80 The homogeneous solid solution was polished for 5 minutes under the condition of 50kPa to make the surface smooth and inject residual stress to obtain the polished sample;

[0039] 2) Place the polished sample in H 2 SO 4 and NiSiO 4 mixture (wherein H 2 SO 4 The concentration is 0.5M, NiSiO 4 The concentration is 0.0001M) for electrochemical corrosion, the corrosion voltage range is 550mV relative to the reversible hydrogen electrode, after 3000 seconds of corrosion, remove and wash to obtain a passivation film;

[0040] 3) Place the passivation film in oxygen-saturated HClO 4 Carry out cycl...

Embodiment 2

[0043] A kind of Pd base passivation film with high catalytic activity, this passivation film comprises following components according to atomic percentage:

[0044] Pd 80%,

[0045] Ni 20%.

[0046] in:

[0047] The passivation film has a surface roughness of 250 and a thickness of 300 nm.

[0048] Its preparation method comprises the following steps:

[0049] 1) Pd 25 Ni 75 The homogeneous solid solution was polished for 5 minutes under the condition of 20kPa to make the surface smooth and inject residual stress to obtain the polished sample;

[0050] 2) Place the polished sample in H 2 SO 4 and NiSiO 4 mixture (wherein H 2 SO 4 at a concentration of 1M, NiSiO 4 The concentration is 0.0006M) for electrochemical corrosion, the corrosion voltage range is 650mV relative to the reversible hydrogen electrode, after 5000 seconds of corrosion, remove and wash to obtain a passivation film;

[0051] 3) Place the passivation film in oxygen-saturated HClO 4 Carry out cycli...

Embodiment 3

[0054] A kind of Pd base passivation film with high catalytic activity, this passivation film comprises following components according to atomic percentage:

[0055] Pd 90%,

[0056] Ni 9%,

[0057] Mo 1%.

[0058] in:

[0059] The passivation film has a surface roughness of 240 and a thickness of 300 nm.

[0060] Its preparation method comprises the following steps:

[0061] 1) Pd 25 Ni 74.5 Mo 0.5 The homogeneous solid solution was polished for 10 minutes under the condition of 20kPa to make the surface smooth and inject residual stress to obtain the polished sample;

[0062] 2) Place the polished sample in H 2 SO 4 and NiSiO 4 mixture (wherein H 2 SO 4 at a concentration of 1M, NiSiO 4 The concentration is 0.0005M) for electrochemical corrosion, and the corrosion voltage range is 620mV relative to the reversible hydrogen electrode. After 5000 seconds of corrosion, remove and wash to obtain a passivation film;

[0063] 3) Place the passivation film in oxygen-satu...

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Abstract

The invention discloses a Pd-based passivation film with high catalytic activity and a preparation method thereof. A passivation film contains following components 80-90% of Pd and 10-20% of Ni by atomic percentage, the passivation film further includes one of Mo or Nb and contains following components 80-90% of Pd and 8-18% of Ni by atomic percentage, and the balance is Mo or Nb and not more than2%. The method comprises steps, 1), PdNi homogeneous solid solution, PdNiMo homogeneous solid solution or PdNiNb uniform solid solution are polished in a certain pressure range, the surface is made to be smooth, residual stress is injected, and polished sample is obtained; 2), the polished sample is subjected to constant pressure electrochemical etching in etching solution I to obtain a passivation film; and 3), the passivation film is placed in etching solution II and scanned by cyclic voltammetry, after that, the product is picked out and cleaned to obtain the Pd-based passivation film. Themethod is advantaged in that a problem of poor catalysis stability of a fuel cell in the prior art is solved.

Description

technical field [0001] The invention relates to a Pd-based passivation film with high catalytic activity and a preparation method thereof, belonging to the field of nanometer material preparation. Background technique [0002] The oxygen reduction reaction is the cathode reaction of the fuel cell, and its reaction efficiency directly affects the conversion efficiency of the fuel cell. With the assistance of carbon-supported platinum nanoparticles catalysts with high catalytic activity, the oxygen reduction reaction can be carried out at a small overpotential, but carbon-supported platinum nanoparticles are expensive and easy to agglomerate during use, resulting in reduced catalytic effect. Many new Pt and Pd-based nanocatalysts have begun to show their prominence, but these catalysts often have the following problems. First of all, most nanocatalysts show better catalytic effects due to their high specific surface area, such as nanoparticles, nanoporous, etc.; but the struc...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/92H01M4/88
CPCH01M4/9058H01M4/921H01M4/8825Y02E60/50
Inventor 曾宇乔杨志朱奎张旭海季宝荣郑新健吕宙卢倩文方峰周雪峰蒋建清
Owner SOUTHEAST UNIV
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