Abstract
Bifunctional electrocatalysts for overall water splitting in acidic media is critical for polymer electrolyte membrane (PEM) electrolysis of water. We report a synthesis of porous carbon-coated noble metal-based catalysts. We adopt simple annealing strategy involving Ir-doped zeolite imidazole skeleton to obtain IrCo alloys encapsulated by the porous carbon layers and carbon nanotubes, which is a new method for synthesizing IrCo alloy. The amount of Ir loaded in IrCo NPs catalyst is extremely low (only 6.7 wt%) and IrCo NPs exhibit excellent catalytic activity for both HER and OER in acidic environment, to achieve 10 mA cm−2 current density during HER and OER, overpotential of only 23.9 and 270 mV is required for our novel IrCo NPs catalyst. More significantly, IrCo NPs reach 10 mA cm−2 during overall water splitting at a cell voltage of only 1.55 V in 0.5 M H2SO4 and demonstrated good durability. Thus, it has excellent prospects to be implemented into PEM for water electrolysis.
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