Electrode electrolyte for polymer-type fuel cell, and use thereof

An electrode electrolyte, for a polymer-type fuel cell, comprising a polyarylene-based copolymer including a sulfonic acid group, wherein the copolymer contains a repeating constitutional unit represented by the following Formula (I):

• (in Formula (I), Y denotes at least one kind of structure selected from the group consisting of —CO—, —SO2—, —SO—, —CONH—, —COO—, —(CF2)I— (I is an integer of 1 to 10), and —C(CF3)2—;
• W denotes at least one kind of structure selected from the group consisting of a direct bond, —CO—, —SO2—, —SO—, —CONH—, —COO—, —(CF2)I— (I is an integer of 1 to 10), —C(CF3)2—, —O—, and —S—;
• Z denotes a direct bond or at least one kind of structure selected from the group consisting of —(CH2)I— (I is an integer of 1 to 10), —C(CH3)2—, —O—, —S—, —CO—, and —SO2—;
• R30 denotes a nitrogen-containing aromatic ring having at least one substituent represented by —SO3H, —O(CH2)hSO3H, or —O(CF2)hSO3H (h is an integer of 1 to 12);
• and
• p denotes an integer of 0 to 10;
• q denotes an integer of 0 to 10;
• r denotes an integer of 1 to 5;
• and k denotes an integer of 0 to 4, and in single lines at the ends of each constitutional unit, a single line not showing a substituent on one side thereof means coupling with the adjacent constitutional unit).