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Composite oxide carbon carrier loaded nanometer Pt catalyst and its preparation method and application

A composite oxide, carbon support technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor hydrophilicity, weak metal support, poor catalytic activity and stability , to achieve the effect of good catalytic activity, improved quality activity, improved catalytic activity and stability

Active Publication Date: 2019-06-25
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Pt-based catalyst on the carbon support of the cathode has a relatively high electrode potential under acidic conditions (C+2H 2 O→CO 2 +4H + +4e-, 0.207V vs NHEat 25℃) would appear more severe carbon corrosion, poorer hydrophilic ability and weaker metal-support interaction, resulting in dissolution and aggregation of Pt particles, resulting in relatively poor catalytic activity and stability

Method used

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  • Composite oxide carbon carrier loaded nanometer Pt catalyst and its preparation method and application
  • Composite oxide carbon carrier loaded nanometer Pt catalyst and its preparation method and application
  • Composite oxide carbon carrier loaded nanometer Pt catalyst and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0048] (1)Pt / C-Ti x Ta 1-x o 2 Catalyst (Pt / C-Ti x Ta 1-x o 2 -120℃-H 2 , x=0.7) Preparation:

[0049] In the method of hydrothermal synthesis, 22.95 μL TiCl 4 and 32.235 mg TaCl 5 Add water, and add 100mg of conductive carbon black EC-300 (Shanghai Hesen) as a high specific surface carbon carrier, and stir it ultrasonically for 30 minutes to make it evenly mixed; React in the furnace for 2 hours, then cool to room temperature, centrifuge, wash with ultrapure water for several times, dry, and then calcinate in Ar at 500°C for 3 hours, and finally obtain the composite oxide carbon support C-Ti x Ta 1-x o 2 ; The C-Ti obtained in the previous step x Ta 1-x o 2 Ultrasonic dispersion in 445μL chloroplatinic acid aqueous solution (75mg pt / mL), soaked for 3 hours to obtain H 2 PtCl 6 / C-Ti x Ta 1-x o 2 , after freeze-drying, put H in a tube furnace at 120 °C 2 Reduction for 1h to obtain the catalyst Pt / C-Ti x Ta 1-x o 2 -120℃-H 2 , the resulting catalyst Pt / ...

Embodiment 2

[0056] (1) Pt / C-Ti x Ta 1-x o 2 Catalyst (Pt / C-Ti x Ta 1-x o 2 -120℃-H 2 -700°C-Ar, x=0.7) Preparation:

[0057] In the method of hydrothermal synthesis, 22.95 μL TiCl 4 and 32.235 mg TaCl 5 Add water, and add 100mg of conductive carbon black EC-300 (Shanghai Hesen) as a high specific surface carbon carrier, and stir it ultrasonically for 30 minutes to make it evenly mixed; React in the furnace for 2 hours, then cool to room temperature, centrifuge, wash with ultrapure water for several times, dry, and then calcinate in Ar at 500°C for 3 hours, and finally obtain the composite oxide carbon support C-Ti x Ta 1-x o2 ; The composite oxide carbon carrier C-Ti prepared in the previous step x Ta 1-x o 2 Ultrasonic dispersion in 445μL chloroplatinic acid aqueous solution (75mg pt / mL), soaked for 3 hours to obtain H 2 PtCl 6 / C-Ti x Ta 1-x o 2 , which was lyophilized and passed through H in a tube furnace at 120 °C 2 Reduction 1h, followed by H 2 Replace it with A...

Embodiment 3

[0065] (1)Pt / C-Ti x Ta 1-x o 2 Catalyst (Pt / C-Ti x Ta 1-x o 2 -120℃-H 2 -700℃-H 2 / Ar, x=0.7) preparation:

[0066] In the method of hydrothermal synthesis, 22.95 μL TiCl 4 and 32.235 mg TaCl 5 Add water, and add 100mg of conductive carbon black EC-300 (Shanghai Hesen) as a high specific surface carbon carrier, and stir it ultrasonically for 30 minutes to make it evenly mixed; React in the furnace for 2h, then cool to room temperature, centrifuge, wash with ultrapure water for several times, dry, and then calcinate in Ar at 500°C for 3h, and finally get the composite oxide carbon support C-Ti x Ta 1-x o 2 ; The composite oxide carbon carrier C-Ti prepared in the previous step x Ta 1-x o 2 Ultrasonic dispersion in 445μL chloroplatinic acid aqueous solution (75mg pt / mL), soaked for 3 hours to obtain H 2 PtCl 6 / C-Ti x Ta 1-x o 2 , after freeze-drying, H was introduced into a tube furnace at 120 °C 2 Reduction 1h, followed by H 2 Change to H 2 / Ar (v / v, 5%...

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Abstract

The invention discloses a Pt-based fuel cell cathode catalyst of a transition metal element doped with TiO2 and a carbon compound with high specific surface area as a carrier, and a preparation method of the Pt-based fuel cell cathode catalyst. The method comprises the steps of adding a Ti compound and a transition metal M precursor to water, adding carbon with high specific surface area, carrying out ultrasonic mixing evenly and then obtaining a composite oxide carbon carrier C-Ti<x>M<1-x>O<2> by using a hydrothermal method; and mixing a platinum compound water solution with the C-Ti<x>M<1-x>O<2> and obtaining a composite oxide carbon carrier-loaded nano Pt catalyst, namely a Pt / C-Ti<x>M<1-x>O<2> catalyst by adopting an impregnation method. Compared with commercial Pt / C, the prepared Pt / C-Ti<x>M<1-x>O<2> catalyst has higher catalytic activity and stability due to interaction between a metal and the carrier; the preparation method is simple and convenient, mild in condition and easy to operate; the problems of high surface Pt agglomeration degree and poor stability of the catalyst prepared by adopting a conventional impregnation method are solved; and the composite oxide carbon carrier-loaded nano Pt catalyst is a powder catalyst suitable for a proton exchange membrane fuel cell.

Description

technical field [0001] The invention belongs to the field of fuel cell catalysts, in particular to providing a transition metal doped TiO 2 Composite oxide support Pt / C-Ti x m 1-x o 2 Fuel cell cathode catalyst and preparation method thereof. Background technique [0002] Currently, noble metal Pt is the most common catalytic material for proton exchange membrane fuel cells (PEMFCs), and the activity and stability of oxygen reduction reaction (ORR) catalysts play a crucial role for the commercial application of PEMFCs. In the early reports, the use of nano-sized noble metal catalysts was used as a method to optimize the performance of fuel cells, and carbon materials were also widely used as Pt-based catalyst supports due to their excellent electrical conductivity and high specific surface area. However, the Pt-based catalyst on the carbon support of the cathode has a relatively high electrode potential under acidic conditions (C+2H 2 O→CO 2 +4H + +4e-, 0.207V vs NHEa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/92B82Y30/00
CPCB82Y30/00H01M4/8817H01M4/8825H01M4/926Y02E60/50
Inventor 陈胜利熊晓丽
Owner WUHAN UNIV
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