Spent residue slurry-phase hydrocracking catalyst coated with coke have been classified as hazardous solid waste, presenting serious economic and environmental issues to refiners. Herein, the spent catalysts with a nickel sulfide nanoparticle/coke hierarchical structure (NiS /C) from our previous work were used to prepare nickel sulfide/hierarchical porous carbon (NiS /HPC) for the oxygen evolution reaction (OER) through the method of carbonization, activation, and sulfurization. The results indicate that the NiS /C converts into Ni/HPC after carbonization and activation, and then transform into NiS /HPC by sulfurization. The optimized NiS /HPC-8 possesses the crystal phase of NiS , and the high specific surface area of 1134.9 m g with the hierarchical micro-mesoporous structure. Besides, NiS /HPC-8 achieves a low overpotential of 236 mV at 10 mA cm , a low Tafel slope of 64.1 mV dec , and excellent stability. This work provides a viable method for upcycling spent catalysts to re-constructed OER catalysts with high catalytic performance and durability.
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