Synthesis of ZIF-8 derived porous carbon/NiS hexahedral composite and its application in improving the electrochemical hydrogen storage properties of Co–P material

Thermal treatment of zinc-based MOF (ZIF-8) is conducted to prepare ZIF-8 derived porous carbon (ZIF-8-C). ZIF-8-C/NiS hexahedral composites with different C/Ni mole ratios ([email protected], [email protected] and [email protected]) are synthesized by solvothermal method. Co–P hydrogen storage material is prepared via mechanical alloying. Then, composites of Co–P coated with NiS, ZIF-8-C and [email protected] are obtained by ball-milling. Eventually, [email protected] coated Co–P electrode exhibits higher discharge capacity of 624.8 mAh/g than separate NiS or ZIF-8-C modified Co–P and original Co–P electrodes. The HRD, corrosion resistance and kinetics properties of Co–P are also improved after [email protected] loading. The enhanced kinetics performance and electrochemical activities of Co–P + [email protected] may be due to the synergistic effect between flexible porous carbon ZIF-8-C and active NiS nanosheets, which can further accelerate the hydrogen diffusion during the charging/discharging processes.