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(a) LSV curves, (b) overpotentials at current densities of 10 mA cm− 2 and 100 mA cm− 2, and (c) Tafel slopes of (Ni, Fe)S2@MoS2, (Ni, Fe)S2, MoS2 and Pt/C. (d) LSV curves and (e) overpotential at 10 mA cm− 2 and 100 mA cm− 2 of (Ni, Fe)S2@MoS2 (Mo:S—0.25:5, 0.5:5, 1:5 and 3:5). (f) Electrochemical stability test at 10 mA cm− 2 of (Ni, Fe)S2@MoS2. (Reprinted with permission from Ref. [123], Copyright 2019, Applied Catalysis B: Environmental).
