“…Although it was inferior to 20 wt% Pt/C, it was comparable to or better than other reported selenide or sulfide electrocatalysts in acidic/alkaline electrolytes (Fig. 5d), such as MoSe 2 -Cu 2 S, 42 MoS 2 /NiS 2 -3, 43 CuSe, 44 CuFe/ NF, 45 Cu@CoFe LDH, 46 Se-doped MoS 2 , 22 Au@MoS 2 , 47 MoSe x S 2−x /Ni, 48 Co 9 S 8 -Ni 3 S 2 -CNTs/NF, 49 and EG/Co 0.85 Se/ NiFeLDH. 50 Electrochemical impedance spectroscopy (EIS) was performed to further examine the HER reaction mechanism.…”