The effect of ammonia evaporation temperature was investigated in the range of 60 to 100 C [73]. Morphologies of CuPS (sphere-like or slit-like structure) depends heav- ily on the temperature used in AE. An optimal crystallinity was achieved at 90 C (see Figure 5). A maximal fraction mole of Cu+ (Cu+–(Cu0 + Cu+) = 0.55) and the highest DMO hydrogenation activity was evidenced on the CuPS-cat made by using 90 C as the evaporation temperature.