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However, since the catalyst used in the fuel cell is a noble metal such as platinum, there is a problem that the manufacturing cost of the fuel cell increases due to the increase in the amount of the catalyst loaded.
[0005] In addition, in the reaction electrode in which the catalyst is supported on carbon particles, electrons are lost between the carbon particles and between the carbon particles and the separator as a collector.
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[0124] Hereinafter, specific aspects of the present invention will be described in more detail by way of examples, but the present invention is not limited by these examples unless the gist thereof is exceeded.
[0125] 1. Preparation of Catalyst-supported CNTs
manufacture example 1
[0127] First, on a substrate made of silicon, an iron catalyst was sputtered as a catalyst metal to form a film. The substrate on which the catalytic metal film was formed was placed in a CVD furnace.
[0128] Next, a 25% hydrogen gas (carrier: nitrogen) was supplied into the CVD furnace, and the temperature in the furnace was raised from room temperature (15 to 25° C.) to 800° C. over 5 minutes to activate the catalyst metal.
[0129] Then, in addition to the gas of 25% hydrogen (carrier: nitrogen), 8% acetylene gas (carrier: nitrogen) was supplied as a carbon source in the CVD furnace, and the temperature in the furnace was kept at 800°C to grow CNTs for 10 minutes. .
[0130] Finally, a 100% nitrogen gas was supplied into the CVD furnace, and the temperature in the furnace was cooled from 800°C to room temperature (15-25°C) in 5 minutes to stop the growth of CNTs and produce approximately vertically aligned CNTs. The obtained substantially vertically oriented CNTs were ap...
Embodiment 1
[0133] The catalyst-supported CNT of Production Example 1, and an ionomer solution diluted at 8% solid content (hereinafter referred to as 8% solid content ionomer solution) were prepared.
[0134] The catalyst-supported CNTs were impregnated in an ionomer solution with a solid content of 8%. After 5 minutes, the ionomer-coated catalyst-supported CNTs were taken out, and left to stand at room temperature (15 to 25° C.) with the surface direction of the substrate tilted to a vertical direction. The ionomer-coated catalyst-supported CNTs were then impregnated in 100% ethanol. One minute later, the ionomer-coated catalyst-supported CNTs were taken out, and left to stand at room temperature (15 to 25° C.) with the plane direction of the substrate tilted to a vertical direction.
[0135] The above steps were regarded as one treatment, and the ionomer impregnation amount (hereinafter referred to as I / C amount) was measured for each treatment by the following method.
[0136] First...
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Abstract
Provided is a method of manufacturing a catalyst-supporting carbon nanotube which is uniformly coated with an ionomer from the base to the end part of the carbon nanotube. A method of manufacturing a catalyst-supporting carbon nanotube which is coated with an ionomer comprises: a step of preparing, on at least one face of a substrate, a catalyst-supporting carbon nanotube which is oriented approximately perpendicular to the direction of the plane of the substrate; a step of preparing a first ionomer solution; an ionomer coating step of bringing the catalyst-supporting carbon nanotube into contact with the first ionomer solution and coating the catalyst-supporting carbon nanotube with the ionomer; and a drying step of drying the catalyst-supporting carbon nanotube which is coated with the ionomer. At least one iteration of a sequential process including the steps from the ionomer coating step to the drying step is carried out. The method further comprises an ionomer removal step of, after the ionomer coating step and before the drying step, preferentially removing the portion of the ionomer which has adhered unevenly in a thickness direction of a layer formed from the ionomer-coated catalyst-supporting carbon nanotube that has adhered on the end part of the carbon nanotube to a relatively greater degree than on other sites of the carbon nanotube.
Description
technical field [0001] The present invention relates to a method for producing catalyst-supported carbon nanotubes uniformly coated with an ionomer from the root to the end of the carbon nanotubes. Background technique [0002] A fuel cell directly converts chemical energy into electrical energy by supplying fuel and an oxidant to two electrically connected electrodes to cause oxidation of the fuel electrochemically. Unlike thermal power generation, fuel cells are not subject to the Carnot cycle and thus exhibit high energy conversion efficiency. A fuel cell is generally constituted by stacking a plurality of unit cells whose basic structure is a membrane-electrode assembly sandwiching an electrolyte membrane between a pair of electrodes. [0003] In the electrochemical reaction on the anode and cathode of the fuel cell, gases such as fuel gas and oxidant gas are introduced to the surface that is in contact with the catalyst particles carried by the carrier as a conductor a...
Claims
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