Abstract
In this work, sheet-like Co9S8 was directly grown on Ni3S2 spheres (donate as Co9S8@Ni3S2) via a one-step hydrothermal synthetic approach. The structural characterization of Co9S8@Ni3S2 revealed that the Co9S8 nanosheets were perpendicularly arrayed on Ni3S2 spheres. This heterostructure thus fixes the two-dimensional Co9S8 in position on Ni3S2 spheres to obtain a stable heterostructural material. Due to the strengthened morphological structure, high surface area, metallic feature of Co9S8 and Ni3S2, and the synergetic effect, the Co9S8@Ni3S2 showed excellent performance in sodium ion battery (SIB) anode and HER cathode. The electrochemical tests showed that Co9S8@Ni3S2 can demonstrate excellent HER catalytic activity with only −0.16 V and −0.23 V overpotential needed to achieve 10 mA cm−2 and 100 mA cm−2 current density in acidic condition. Besides, Co9S8@Ni3S2 heterostructure as an anode in SIB also delivered high discharge capacity of 699 mAh g−1 at 0.5 A g−1 current density in the first cycle, with 92% Columbic efficiency.
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