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

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

Active Publication Date: 2022-06-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Effect test

Embodiment 1

[0032] A Pd-based passivation film with high catalytic activity, the passivation film comprises the following components according to atomic percentage:

[0033] Pd 90%,

[0034] Ni 10%.

[0035] in:

[0036] The surface roughness of the passivation film was 170 and the thickness was 500 nm.

[0037] Its preparation method comprises the following steps:

[0038] 1) Put the Pd 20 Ni 80 The uniform solid solution was polished under the condition of 50kPa for 5 minutes 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 (where H 2 SO 4 The concentration is 0.5M, NiSiO 4 Electrochemical corrosion was carried out in the concentration of 0.0001M), the corrosion voltage range was 550mV relative to the reversible hydrogen electrode, and after corrosion for 3000 seconds, the passive film was obtained by removing and cleaning;

[0040] 3) Place the passivation film in oxyge...

Embodiment 2

[0043] A Pd-based passivation film with high catalytic activity, the passivation film comprises the following components according to atomic percentage:

[0044] Pd 80%,

[0045] Ni 20%.

[0046] in:

[0047] The surface roughness of the passivation film was 250 and the thickness was 300 nm.

[0048] Its preparation method comprises the following steps:

[0049] 1) Put the Pd 25 Ni 75 The uniform solid solution was polished under the condition of 20kPa for 5min 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 (where H 2 SO 4 The concentration is 1M, NiSiO 4 Electrochemical corrosion was carried out in the concentration of 0.0006M), the corrosion voltage range was 650mV relative to the reversible hydrogen electrode, and after corrosion for 5000 seconds, the passive film was obtained by removing and cleaning;

[0051] 3) Place the passivation film in oxygen-satur...

Embodiment 3

[0054] A Pd-based passivation film with high catalytic activity, the passivation film comprises the following components according to atomic percentage:

[0055] Pd 90%,

[0056] Ni 9%,

[0057] Mo 1%.

[0058] in:

[0059] The surface roughness of the passivation film was 240 and the thickness was 300 nm.

[0060] Its preparation method comprises the following steps:

[0061] 1) Put the Pd 25 Ni 74.5 Mo 0.5 The uniform solid solution is polished under the condition of 20kPa for 10min 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 (where H 2 SO 4 The concentration is 1M, NiSiO 4 Electrochemical corrosion was carried out in the concentration of 0.0005M), and the corrosion voltage range was 620mV relative to the reversible hydrogen electrode, and after corrosion for 5000 seconds, it was removed and cleaned to obtain a passivation film;

[0063] 3) Place the pas...

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Abstract

The invention discloses a Pd-based passivation film with high catalytic activity and a preparation method thereof. The passivation film contains the following components by atomic percentage: 80-90% of Pd, 10-20% of Ni; the passivation film also contains It includes one of Mo or Nb, and contains the following components by atomic percentage: 80-90% of Pd, 8-18% of Ni, and the rest is Mo or Nb, and not more than 2%. The preparation steps are as follows: 1) Polish PdNi homogeneous solid solution, PdNiMo homogeneous solid solution or PdNiNb homogeneous solid solution within a certain pressure range to make the surface smooth and inject residual stress to obtain a polished sample; 2) Polish the polished sample in Perform constant-voltage electrochemical corrosion in corrosion solution I to obtain a passivation film; 3) place the passivation film in corrosion solution II and scan it by cyclic voltammetry, then remove and wash it. The invention solves the problems of poor catalytic stability of existing fuel cells and the like.

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 nanomaterial 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 aid of carbon-supported platinum nanoparticle catalysts with high catalytic activity, the oxygen reduction reaction can be carried out with a small overpotential, but carbon-supported platinum nanoparticles are expensive and easy to agglomerate during use, resulting in a reduced catalytic effect. Many new Pt and Pd-based nanocatalysts have begun to emerge, but these catalysts often have the following problems. First of all, most of the nanocatalysts show better catalytic effect due to their high specific surface area, such as nanoparticles, nanoporous, etc. However, the structure with high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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