Abstract
A Ni–Fe binary alloy ingot, prepared by conventional vacuum smelting, was adopted as substrate in this work to fabricate the anode for water splitting. To improve the surface roughness of anode surface, the electrode was firstly subjected to anodic leaching in a simple KSCN solution. The as-leached electrode was subsequently activated through linear sweep voltammetry in 1 M KOH solution with or without 0.33 M urea addition to finish the final step for electrode preparation. The as-prepared anode delivers the 10 mA cm−2 current density at an overpotential of 284 mV for oxygen evolution reaction (OER) and at 1.361 V (RHE) for urea oxidation reaction (UOR), respectively. No apparent change of OER and UOR performance was observed after chronopotentiometric aging. The more complex UOR behavior was analyzed to elucidate the synergy among all constituents functioning through direct or indirect mechanisms for the half-reaction on this binder-free, self-supporting and substrate-rejuvenating anode.
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