Figure 5. (A) Structure diagram and (B) Gibbs free energy profiles of UOR on NiSe2 and NiSe2-Ni3Se4[65]; Gibbs free energy profiles of UOR on the surface of (C) Ni oxyhydroxide and (D) V-dopant and O-vacancy contained Ni oxyhydroxide[66]. UOR: Urea oxidation reaction.