CATALYST AND ELECTRODE CATALYST LAYER, MEMBRANE ELECTRODE ASSEMBLY, AND FUEL CELL USING THE CATALYST
The object of the present invention is to provide a catalyst having an excellent catalyst activity. In the present invention, a catalyst is configured to include a catalyst support and a catalyst metal supported on the catalyst support, wherein a mode radius of pore distribution of pores of the catalyst is 1 nm or more and less than 5 nm, wherein the mode radius is equal to or less than an average particle radius of the catalyst metal, and wherein a pore volume of the pores is 0.4 cc/g support or more.
1 .- 9 . (canceled)
10 . A catalyst comprising:
a catalyst support; and
a catalyst metal supported on the catalyst support,
wherein a mode radius of pore distribution of pores having a radius of 1 nm or more of the catalyst is 1 nm or more and less than 5 nm,
wherein the catalyst metal is supported inside the pores of which mode radius is 1 nm or more and less than 5 nm,
wherein the mode radius is equal to or less than an average particle radius of the catalyst metal, and
wherein a pore volume of the pores of which mode radius is 1 nm or more and less than 5 nm existing in the catalyst is 0.4 cc/g support or more.
11 . The catalyst according to claim 10 , wherein the mode radius is 1 nm or more and 2 nm or less.
12 . The catalyst according to claim 10 , wherein the average particle radius of the catalyst metals is 1.5 nm or more and 2.5 nm or less.
13 . The catalyst according to claim 10 , wherein the catalyst metal is platinum or includes platinum and a metal component other than platinum.
14 . An electrode catalyst layer for fuel cell comprising the catalyst according to claim 10 and an electrolyte.
15 . The electrode catalyst layer for fuel cell according to claim 14 , further comprising a liquid proton conducting material connecting the catalyst metal in the catalyst and the electrolyte in a proton conductible state.
16 . The electrode catalyst layer for fuel cell according to claim 14 , wherein a covering ratio of the electrolyte on the catalyst metal is 0.45 or less.
17 . A membrane electrode assembly for fuel cell comprising the electrode catalyst layer for fuel cell according to claim 14 .
18 . A fuel cell comprising the membrane electrode assembly for fuel cell according to claim 17 .