Core-shell Heterostructure Construction Between Thiospinel CuCo2S4 and MoS2 for Improved Hydrogen Evolution Electrocatalytic Performance

The heterostructure construction between thiospinel transition metal sulfide CuCo2S4 and MoS2 was achieved by a simple three-step hydrothermal process. Ni foam(NF)was employed as the substrate and the self-supported MoS2@ CuCo2S4-Ni3S2/NF electrode was obtained. The high resolution transmission electron mi. croscopy(HRTEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron mi. croscopy(SEM)and transmission electron microscopy(TEM)verified that MoS2 nanosheets grown onto the sur. face of CuCo2S4-Ni3S2 nanorods densely and uniformly,which formed a hierarchical core-shell structure. The electrocatalytic performance of MoS2@CuCo2S4-Ni(3)S2/NF for hydrogen evolution reaction(HER) in 1 mol/L KOH verified that the rational hybridization between MoS2 and CuCo2S4 as well as the construction of the specific nanostructure significantly increased the electrochemical surface area and efficiently improved the electron transfer. Therefore,MoS2@CuCo2S4-Ni3S2/NF only needed overpotential of 116,231,282 mV,respectively, to reach the current density of 10,100,300 mA/cm(2). The overpotential corresponded to 100 mA/cm(2) only in. creased 6% after 2000 cycles of CV measurement. Therefore,outstanding HER catalytic activity and stability have been achieved by this MoS2@CuCo2S4-Ni3S2/NF self-supported electrode.