Binary Pd alloys were prepd. by electrodeposition from baths containing PdCl2, RhCl3, or RuCl3 and HCl on Au wire substrate and used for H-2 electrosorption in acidic soln. The Pd-rich alloys (Rh or Ru contents 7.4% at. or 0.7% at., resp.) showed higher H-2 absorption capacities the Pd alone (by 13% and 20%, resp.). This fact was explained by a favorable electronic effect due to alloy formation. The alloys with adsorbed H-2 can be used as electrode materials for electrochem. capacitors with the parameters typical for faradaic supercapacitors.