| abstract |
(57) [Abstract] [PROBLEMS] To provide an electrode substrate having excellent electrical conductivity in the thickness direction of the electrode and thermal oxidation resistance, and a method for producing the same. [Structure] An electrode base material made of carbon fiber or graphite fiber-carbon composite material, in which only carbon fiber or graphite fiber in the electrode base material, or both matrix carbon, is converted into boron in an amount of 0.01 to 5. An electrode substrate containing 0 wt% of at least one of boron and a boron compound. |