The present invention provides a method for producing a membrane and electrode assembly of a fuel cell, the method comprising: forming a composition for forming a catalyst layer by mixing a polymer ionomer, an alcohol solvent, and a polar organic solvent having a boiling point of 30 to 200\xb0 C. Electrical properties of the structure may be altered by applying energy to the structure, and thus information may be stored using the structure. A delay line control circuit is also provided that is responsive to a clock signal having a period from which the percent-of-clock period delay is preferably measured.