fig12

Figure 12. (A) The polarization curves for HER of N-FePS₃, FePS₃, and Pt/C in 1.0 M KOH; (B) The polarization curves for UOR and the polarization curves for urea electrolysis of N-FePS₃ and FePS₃ in 1.0 M KOH + 0.33 M glucose; (C) The polarization curves for urea electrolysis of N-FePS₃ and FePS₃^[23]; (D) The adsorption energy of urea on CuO (111) and Ni-CuO (111); (E) Reaction free spectrum of UOR catalyzed by CuO and Ni-CuO^[125]. HER: Hydrogen evolution reaction; UOR: Urea oxidation reaction.