Preparation method of electrode and membrane electrode for fuel cell with fully-ordered catalyst layer structure

Abstract

The invention discloses a preparation method of an electrode and a membrane electrode for a fuel cell with a fully-ordered catalyst layer structure, and relates to the field of fuel cells. In the electrode and the membrane electrode for the fuel cell prepared by the method, the components of the catalyst layer comprise a catalyst activity component, a catalyst carrier and an ion conductor which are of ordered array structures. The fully-ordered catalyst layer structure is of an extremely high three-phase reaction interface, and efficient electron, ion and matter transfer passages can be provided, so that the matter transfer resistance, load transfer resistance and electrochemical polarization resistance inside the electrode are reduced effectively, and the electrochemical reaction efficiency and energy conversion efficiency in the electrode are improved effectively. Through monocell performance test and electrochemical characterization, the electrode and the membrane electrode preparedby the preparation method is obviously improved in the aspects of monomer performance and catalyst layer activity compared with an electrode and a membrane electrode prepared by a traditional method.

Description

technical field

[0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a fuel cell electrode and a membrane electrode with a catalytic layer fully ordered structure. Background technique

[0002] Electrodes and membrane electrodes are the core components of proton exchange membrane fuel cells (PEMFC). They are the final places for multiphase material transport and electrochemical reactions that cause energy conversion, and determine the performance, life and cost of PEMFC. As early as 2013, the U.S. Department of Energy clearly stated in the "Fuel Cell Technical Roadmap" that the performance target of membrane electrodes in 2020 is to reach a power density of 1.0W / cm 2 , the accelerated aging life can reach 5000h, and the cost is less than 14$ / kW. With the process of commercialization of PEMFC, people put forward a higher pursuit of its performance and life.

[0003] However, in the current preparation of PEMFC electrodes...

Examples

Embodiment 1

[0034] combined with figure 2 The process and process shown are used to prepare catalyst layer fully ordered polyelectrolyte membrane fuel cell electrodes and membrane electrodes, and conduct discharge tests. The main steps are as follows:

[0035] (1) In situ growth of VACNT arrays on the gas diffusion layer

[0036] After washing and drying a piece of AAO double-pass porous template with a size of 2.3cm×2.3cm (pore size is 30nm, thickness is 100μm), it is bonded with a piece of carbon paper of the same size as the gas diffusion layer 1, and placed in a tube furnace , pass through acetylene at 600°C for 60 minutes, and vapor-deposit it in the pores of the AAO template, and finally use 1mol / L NaOH solution to remove the AAO template to obtain carbon nanotubes 2 vertically grown on the gas diffusion layer 1 Arrays (VACNTs).

[0037] (2) In situ growth of Pt-NW

[0038] The gas diffusion layer loaded with the VACNT array prepared above was impregnated in 50ml with a concentr...

Embodiment 2

[0044] The catalyst layer fully ordered polyelectrolyte membrane fuel cell electrode and membrane electrode with N-doped VACNT array as the carrier were prepared according to the following steps, and the discharge test was carried out.

[0045] (1) In situ growth of N-doped VACNT arrays on the gas diffusion layer

[0046] After washing and drying a piece of AAO double-pass porous template with a size of 2.3cm×2.3cm (pore size is 30nm, thickness is 100μm), it is bonded with a piece of carbon paper of the same size as the gas diffusion layer 1, and placed in a tube furnace , pass through acetylene at 600°C for 60 min, make it vapor-deposit in the channels of the AAO template, and finally use 1mol / L NaOH solution to remove the AAO template, and obtain the carbon nanotube 2 array vertically grown on the gas diffusion layer 1 (VACNTs). Then, the gas diffusion electrode 1 grown with VACNT was placed in the tube furnace again, and NH was fed at a temperature of 500 °C 3 gas, the fl...

Embodiment 3

[0049] A fully ordered polyelectrolyte membrane fuel cell electrode and a membrane electrode with catalytic layer using S-doped VACNT array as a carrier were prepared according to the following steps, and the discharge test was carried out.

[0050] (1) In situ growth of S-doped VACNT arrays on the gas diffusion layer

[0051] Using the same method as in Example 1, VACNTs grown in situ on the gas diffusion layer 1 were firstly prepared. Then, the gas diffusion electrode grown with VACNT was placed in the tube furnace again, and H was introduced at 500 °C. 2 S gas, the flow rate is 0.1slpm, and the surface S-doped VACNT array is obtained

[0052] Step (2) in-situ growth of Pt-NW and step (3) membrane electrode assembly method are the same as in Example 1. Under the same conditions as in Example 1, the discharge test was carried out, and at a working voltage of 0.6V, the current density can reach 0.48A / cm 2 , the maximum power density reaches 0.82W / cm 2 .

technical field

[0001] The invention relates to the technical field of fuel cells, in particular to a method for preparing a fuel cell electrode and a membrane electrode with a catalytic layer fully ordered structure. Background technique

[0002] Electrodes and membrane electrodes are the core components of proton exchange membrane fuel cells (PEMFC). They are the final places for multiphase material transport and electrochemical reactions that cause energy conversion, and determine the performance, life and cost of PEMFC. As early as 2013, the U.S. Department of Energy clearly stated in the "Fuel Cell Technical Roadmap" that the performance target of membrane electrodes in 2020 is to reach a power density of 1.0W / cm 2 , the accelerated aging life can reach 5000h, and the cost is less than 14$ / kW. With the process of commercialization of PEMFC, people put forward a higher pursuit of its performance and life.

[0003] However, in the current preparation of PEMFC electrodes...

Examples

Embodiment 1

[0034] combined with figure 2 The process and process shown are used to prepare catalyst layer fully ordered polyelectrolyte membrane fuel cell electrodes and membrane electrodes, and conduct discharge tests. The main steps are as follows:

[0035] (1) In situ growth of VACNT arrays on the gas diffusion layer

[0036] After washing and drying a piece of AAO double-pass porous template with a size of 2.3cm×2.3cm (pore size is 30nm, thickness is 100μm), it is bonded with a piece of carbon paper of the same size as the gas diffusion layer 1, and placed in a tube furnace , pass through acetylene at 600°C for 60 minutes, and vapor-deposit it in the pores of the AAO template, and finally use 1mol / L NaOH solution to remove the AAO template to obtain carbon nanotubes 2 vertically grown on the gas diffusion layer 1 Arrays (VACNTs).

[0037] (2) In situ growth of Pt-NW

[0038] The gas diffusion layer loaded with the VACNT array prepared above was impregnated in 50ml with a concentr...

Embodiment 2

[0044] The catalyst layer fully ordered polyelectrolyte membrane fuel cell electrode and membrane electrode with N-doped VACNT array as the carrier were prepared according to the following steps, and the discharge test was carried out.

[0045] (1) In situ growth of N-doped VACNT arrays on the gas diffusion layer

[0046] After washing and drying a piece of AAO double-pass porous template with a size of 2.3cm×2.3cm (pore size is 30nm, thickness is 100μm), it is bonded with a piece of carbon paper of the same size as the gas diffusion layer 1, and placed in a tube furnace , pass through acetylene at 600°C for 60 min, make it vapor-deposit in the channels of the AAO template, and finally use 1mol / L NaOH solution to remove the AAO template, and obtain the carbon nanotube 2 array vertically grown on the gas diffusion layer 1 (VACNTs). Then, the gas diffusion electrode 1 grown with VACNT was placed in the tube furnace again, and NH was fed at a temperature of 500 °C 3 gas, the fl...

Embodiment 3

[0049] A fully ordered polyelectrolyte membrane fuel cell electrode and a membrane electrode with catalytic layer using S-doped VACNT array as a carrier were prepared according to the following steps, and the discharge test was carried out.

[0050] (1) In situ growth of S-doped VACNT arrays on the gas diffusion layer

[0051] Using the same method as in Example 1, VACNTs grown in situ on the gas diffusion layer 1 were firstly prepared. Then, the gas diffusion electrode grown with VACNT was placed in the tube furnace again, and H was introduced at 500 °C. 2 S gas, the flow rate is 0.1slpm, and the surface S-doped VACNT array is obtained

[0052] Step (2) in-situ growth of Pt-NW and step (3) membrane electrode assembly method are the same as in Example 1. Under the same conditions as in Example 1, the discharge test was carried out, and at a working voltage of 0.6V, the current density can reach 0.48A / cm 2 , the maximum power density reaches 0.82W / cm 2 .

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