▎ 摘　　要

NOVELTY - A catalyst complex (100) comprises a hydrogen oxidation reaction catalyst (10), and a water electrolysis reaction catalyst (20). The outer surface of the catalyst (10) is coated with an ionomer binder (110) and an outer surface of the catalyst (20) is coated with an ionomer binder (220). The equivalent weight (EW) of the binder (220) differs from an equivalent weight (EW) of the binder (110). USE - Complex used in catalyst ink for electrode for fuel cells (all claimed) polymer electrolyte membrane fuel cell (PEMFC) for vehicles. ADVANTAGE - The complex suppresses excessive voltage increase of electrode when the voltage is reversed due to uniform supply of water to the water electrolysis catalyst. The fuel cell has improved voltage reversal strength by a simple and economical method thereby improving driving stability of vehicle, excellent productivity and marketability, reduced cost, and saves energy and resources. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of an electrode using a catalyst ink. DESCRIPTION OF DRAWING(S) - The drawings show schematic view of existing catalyst complex and the catalyst complex. Hydrogen oxidation reaction catalyst (10) Carbon carrier (11) Water electrolysis reaction catalyst (20) Catalyst complex (100) Ionomer binders (110,220)