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Preparation and application of ordered gas diffusion electrode based on nanotube array

A technology of gas diffusion electrodes and nanotube arrays, applied in circuits, fuel cells, electrical components, etc., can solve the problems of disordered accumulation of catalysts, low utilization rate of catalysts, high consumption of precious metals, etc., and achieve adjustable catalyst components and preparation The effect of mild conditions and thin catalytic layer thickness

Active Publication Date: 2019-06-21
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional CCM electrode and GDE electrode have mature preparation technology, but the thickness of the catalytic layer of the electrode is large, and the catalyst is piled up disorderly, which makes the amount of catalyst used high and the utilization rate of catalyst low
In order to solve the problems of high consumption of precious metals and low catalyst utilization in fuel cells, 3M has developed an ordered thin-layer electrode (NSTF electrode, Nanostructured Thin Film electrode), which has the characteristics of microscopic order and low catalyst loading. , which can effectively reduce mass transfer resistance and improve catalyst utilization

Method used

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  • Preparation and application of ordered gas diffusion electrode based on nanotube array
  • Preparation and application of ordered gas diffusion electrode based on nanotube array
  • Preparation and application of ordered gas diffusion electrode based on nanotube array

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Preparation of Co-OH-CO by hydrothermal method using stainless steel as substrate 3 array. The reaction solution was 10 mM ammonium fluoride, 25 mM urea, and 5 mM cobalt nitrate. React in a high-pressure reactor at 120°C for 5 hours to prepare Co-OH-CO on the substrate 3 array. image 3 a) shows the prepared Co-OH-CO 3 SEM image of the nanorod array. It can be seen from the figure that Co-OH-CO 3 Nanorod arrays grow uniformly on the substrate, the growth direction is basically perpendicular to the substrate, the diameter is about 100nm, Co-OH-CO 3 The areal density of nanorods is 3-4e 9 / cm 2 .

[0044] Co-OH-CO was deposited by magnetron sputtering 3 Pd is carried on the array. The magnetron sputtering power is 100W, the sputtering time is 10min, and the operating pressure is 1.0Pa. image 3 b) shows the TEM image of the fabricated nanorod array. It can be seen from the figure that magnetron sputtering in Co-OH-CO 3 A uniform Pd layer is carried on the arr...

Embodiment 2

[0051] Co-OH-CO 3 Nanorod arrays, Pd@Co-OH-CO 3 Refer to Example 1 for the preparation method of the nanorod array. Co-OH-CO loaded with Pd 3 nanorod arrays at 400 °C, H 2 -Ar(5vol.%H 2 ) atmosphere annealed for 60min, during the annealing process Co-OH-CO 3 The nanorod arrays were reduced to Co nanorod arrays. Figure 5 a) shows the prepared Co-OH-CO 3 SEM image of the nanorod array. Figure 5 b) is the Pd nanorod array after annealing treatment, the annealing treatment did not destroy the order of the array, the length of the Co nanorods loaded with Pd is about 3 μm, and the diameter is about 140 nm. The Pd@Co nanorod array was transferred onto the gas diffusion layer with a microporous layer, the transfer pressure was 2 MPa, the transfer temperature was 25 °C, and the transfer time was 1 min.

[0052] Purify the gas diffusion electrode. The treatment process is as follows: put the gas diffusion electrode in 0.5M sulfuric acid solution, soak it at 80°C for 1 hour, pi...

Embodiment 3

[0057] Refer to Example 2 for the preparation method of the ordered gas diffusion electrode.

[0058] The prepared gas diffusion electrode was packaged into a membrane electrode assembly, the packaged pressure was 0.5 MPa, and the temperature was 140°C. The anode of the membrane electrode assembly uses a gas diffusion electrode, and the loading capacity of the anode Pt / C (70wt.%, Johnson Matthey) is 0.15mg cm -2 , The electrolyte membrane is a commercial alkaline anion exchange membrane (AS-4). Battery test condition: H 2 / O 2 Flow: 100 / 200sccm; battery temperature 50°C, saturated humidification, battery back pressure 0.2MPa. Figure 8 Shown is the I-V performance curve of the ordered gas diffusion electrode based on the PdCo nanotube array in the fuel cell, and the maximum output power of the cell is 161.4mWcm -2 , indicating that the prepared cells also have good performance in alkaline anion exchange membrane fuel cells.

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Abstract

The invention discloses preparation and application of an ordered gas diffusion electrode based on a nanotube array. The preparation comprises formation of an ordered microstructure, preparation of the nanotube array and assembly of the ordered gas diffusion electrode. Firstly, a Co-OH-CO3 nanorod array with a regular orientation is grown on a substrate; and then, a catalyst film is deposited on the surface of the Co-OH-CO3 nanorod array, and at the moment, the Co-OH-CO3 nanorod array with the catalyst film can be is directly transferred to a gas diffusion layer or is transferred to the gas diffusion layer after being annealed. The prepared gas diffusion electrode can be directly applied to a fuel cell, and can also be applied to the fuel cell after the surface of the nanotube array is loaded with a catalyst. The prepared gas diffusion electrode has the advantages of being low in catalyst loading capacity, high in catalyst utilization rate and the like.

Description

technical field [0001] The invention relates to a method for preparing an ordered gas diffusion electrode, which belongs to the field of fuel cells. Background technique [0002] A fuel cell is a highly efficient energy conversion device that efficiently converts chemical energy stored in chemical substances into electrical energy. Proton exchange membrane fuel cells have attracted widespread attention due to their advantages such as high power density, fast start-up speed, high conversion efficiency, and environmental friendliness. At present, fuel cells have been applied in many fields such as electric vehicles, distributed power stations, and aviation. [0003] The membrane electrode assembly (MEA) is the core component of the electrochemical reaction of the fuel cell, which consists of a catalytic layer and a gas diffusion layer located on both sides of the proton exchange membrane. Membrane electrodes are mainly divided into Gas Diffusion Electrode (GDE), Catalyst Coa...

Claims

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Application Information

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IPC IPC(8): H01M8/1016H01M8/1069H01M8/1086
CPCY02E60/50
Inventor 邵志刚曾亚超张洪杰俞红梅衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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