NOVELTY - Use of an electrocatalyst comprising palladium and iridium is claimed for catalyzing an electrolysis process.    USE - The electrocatalyst is useful for catalyzing electrolysis process; for electrolyzing water; for electrolyzing aqueous sodium chloride solution; for producing hydrogen (via electrolysis process) and/or oxygen (via electrolysis of water); for producing hydrogen and/or chlorine and/or sodium hydroxide; and for preparing electrolysis system (all claimed).    ADVANTAGE - The catalyst system increases efficiency in the electrolysis chemistry and/or reduces the overall costs of the processing.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) an electrolysis system comprising an electrocatalyst, where the electrocatalyst comprises palladium and iridium; or an electrolysis system comprising a cathode, an anode, and an electrolyte or electrolytes, where the cathode, the anode or both the cathode and the anode comprise an electrocatalyst comprising palladium and iridium;    (2) a method for electrolyzing water involving providing a water electrolyzer comprising an anode, a cathode, and an electrolyte or electrolytes, where at least one of the anode and the cathode comprises an electrocatalyst comprising palladium and iridium; contacting the water electrolyzer with water; and generating hydrogen and/ or oxygen;    (3) a method for electrolyzing an aqueous sodium chloride solution involving: (i) providing an electrolysis system comprising an anode, a cathode, and an electrolyte or electrolytes, where at least one of the anode and the cathode comprises an electrocatalyst comprising palladium and iridium; (ii) contacting the cathode and the anode of the electrolysis system with the electrolyte or electrolytes where one of the electrolytes is an aqueous sodium chloride solution; and (iii) generating hydrogen and/or chlorine and/or sodium hydroxide;    (4) a method for producing hydrogen and/or oxygen involving: (i) providing a water electrolyzer comprising an anode, a cathode, and an electrolyte or electrolytes, where at least one of the anode and the cathode comprises an electrocatalyst comprising palladium and iridium; (ii) contacting the water electrolyzer with water; and (iii) electrolyzing the water to produce hydrogen and/ or oxygen;    (5) a method for producing hydrogen and/or chlorine and/or sodium hydroxide involving: (i) providing an electrolysis system comprising an anode, a cathode, and an electrolyte or electrolytes, where at least one of the anode and the cathode comprises an electrocatalyst comprising palladium and iridium;(ii) contacting the electrolysis system with the electrolyte or electrolytes where one of the electrolytes is an aqueous sodium chloride solution; and (iii) electrolyzing the aqueous sodium chloride solution to produce hydrogen and/ or chlorine and/ or sodium hydroxide;    (6) a process for preparing an electrolysis system involving assembling a cathode, an anode and an electrolyte or electrolytes, where the cathode, the anode or both the cathode and the anode comprise an electrocatalyst comprising palladium and iridium;    (7) an electrolyzer electrocatalyst comprising palladium and iridium;    (8) an electrolyzer cathode electrocatalyst comprising palladium and iridium; and    (9) an electrolyzer anode electrocatalyst comprising palladium and iridium.