Catalyst for electrode, composition for forming gas diffusion electrode, gas diffusion electrode, membrane electrode assembly, and fuel cell stack
A technology of gas diffusion electrodes and catalysts, which can be used in solid electrolyte fuel cells, fuel cells, electrical components, etc., and can solve the problems of high cost ratio
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no. 1 approach
[0103] Below, refer to figure 1 The main structure of the first embodiment of the electrode catalyst (core-shell catalyst) of the present invention will be described.
[0104] Such as figure 1 As shown, the electrode catalyst 10A of the first embodiment includes a carrier 2 and catalyst particles 3 a having a so-called “core-shell structure” formed on the carrier 2 .
[0105] Furthermore, the catalyst particle 3 has a so-called core portion 4 formed on the carrier 2, a first shell portion 5a formed on the core portion 4, and a second shell portion 6a formed on a part of the surface of the first shell portion 5a. "Core-shell structure".
[0106] In addition, the constituent elements (chemical composition) of the core portion 4 are different from the constituent elements (chemical composition) of the first shell portion 5 a and the second shell portion 6 a. exist figure 1 In the case of the illustrated electrode catalyst 10A, the first shell portion 5 a covers substantially ...
no. 2 approach
[0109] Below, refer to figure 2 The main structure of the second embodiment of the electrode catalyst of the present invention will be described.
[0110] and figure 1 The electrode shown is compared with Catalyst 10A, figure 2 In the electrode catalyst 10B according to the second embodiment shown, in the catalyst particle 3b, part of the surface of the core portion 4 is covered by the first shell portions 5b and 5c, and the surface of the core portion 4 is partially exposed (for example, figure 2 A state in which a part 4s of the surface of the core portion 4 is exposed). in other words, figure 2 In the illustrated electrode catalyst 10B, first shell portions 5 b and 5 c are partially formed on a part of the surface of the core portion 4 in the catalyst particle 3 b.
[0111] Thus, in the electrode catalyst of the present invention, the first shell portions 5 b and 5 c may be formed on at least a part of the surface of the core portion 4 within the range in which the ...
no. 1 approach and no. 2
[0112] (Features common to the first embodiment and the second embodiment)
[0113] below, yes figure 1 Shown electrode catalyst 10A, figure 2 The electrodes shown are illustrated with common features of Catalyst 10B.
[0114] From the viewpoint of easily obtaining good catalytic activity (hydrogen oxidation activity or oxygen reduction activity), the first shell portions 5a, 5b are preferably composed of only Pt. From the viewpoint of easily obtaining good catalytic activity (hydrogen oxidation activity or oxygen reduction activity) in the first shell portions 5a, 5b, the second shell portions 6a, 6b, 6c are preferably made of only TiO with high chemical stability. 2 constitute. From the viewpoint of easily obtaining good catalytic activity (hydrogen oxidation activity or oxygen reduction activity) in the first shell portions 5a, 5b, the core portion 4 is preferably composed of only Pd.
[0115] In addition, as described above, the electrode catalysts 10A and 10B satisfy...
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Abstract
Description
Claims
Application Information
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