Enhancing Hydrogen Generation by Anodic Oxidation of Urea over Superb Hydrophilic Hierarchical Ni, S co-Doped Co3(PO4)2 Nanosheets.

Surface wettability are of great significance to electrocatalysts for various electrochemical reaction. In this work, Ni, S co-doped Co₃(PO₄)₂ nanosheets on Ni foam (Ni-S-Co₃(PO₄)₂ NSs) with high hydrophilicity and hierarchical structure are synthesized. The doping of S is the key factor to achieve an ultrahigh hydrophilic surface, identified by the contact angle measurement. As except, the as-prepared Ni-S-Co₃(PO₄)₂ NSs display prominent activity for urea oxidation reaction (UOR), which reach the current density of 10 mA cm^-2 at a low potential of 1.28 V (vs. reversible hydrogen electrode, RHE) with excellent stability. Remarkably, when paired with Ni-Mo electrode to fabricate overall urea electrocatalysis device, a cell potential of mere 1.33 V is required to afford the current density of 10 mA cm^-2, making the Ni-S-Co₃(PO₄)₂ NSs an outstanding UOR electrocatalyst for efficient hydrogen production.