Mesoporous carbon and manufacturing method of the same, and polymer electrolyte fuel cell
Mesoporous carbon has a beaded structure in which primary particles with mesopores are linked. In the mesoporous carbon, an average primary particle size is 7 nm or more and 300 nm or less, a pore diameter is 2 nm or more and 10 nm or less, an average thickness of pore walls is 3 nm or more and 15 nm or less, a pore volume is 0.2 mL/g or more and 3.0 mL/g or less, and a tap density is 0.03 g/cm 3 or more and 0.3 g/cm 3 or less. In a polymer electrolyte fuel cell, the mesoporous carbon is used as a catalyst carrier for at least an air electrode catalyst layer. The mesoporous carbon can be obtained by impregnating mesoporous silica satisfying a predetermined condition with a carbon source, performing polymerization and carbonization, and removing a template.
1 . Mesoporous carbon comprising a beaded structure in which primary particles with mesopores are linked, wherein:
an average primary particle size of the mesoporous carbon is 7 nm or more and 250 nm or less;
a pore diameter of the mesopores is 2 nm or more and 10 nm or less;
an average thickness of pore walls of the mesopores is 3 nm or more and 15 nm or less;
a pore volume of the mesoporous carbon is 0.2 mL/g or more and 3.0 mL/g or less; and
a tap density of the mesoporous carbon is 0.03 g/cm 3 or more and 0.3 g/cm 3 or less.
2 . The mesoporous carbon according to claim 1 , wherein the average primary particle size is 10 nm or more and 250 nm or less.
3 . The mesoporous carbon according to claim 1 , wherein the average thickness of the pore walls is 3.5 nm or more and 10 nm or less.
4 . The mesoporous carbon according to claim 1 , wherein the pore volume is 0.5 mL/g or more and 2.5 mL/g or less.
5 . The mesoporous carbon according to claim 1 , wherein the tap density is 0.03 g/cm 3 or more and 0.2 g/cm 3 or less.
6 . The mesoporous carbon according to claim 1 , wherein the mesoporous carbon is obtained by performing a graphitization treatment at a temperature higher than 1500° C.
7 . The mesoporous carbon according to claim 1 , wherein a specific surface area of the mesoporous carbon is 800 m 2 /g or more.
8 . The mesoporous carbon according to claim 1 , wherein the primary particles have an aspect ratio of 1.1 to 3.
9 . The mesoporous carbon according to claim 1 , wherein the tap density is 0.08 g/cm 3 or more and 0.15 g/cm 3 or less.
10 . An air electrode catalyst layer comprising:
the mesoporous carbon according to claim 1 as a catalyst carrier.