Affiliation:
1. College of Chemistry and Chemical Engineering Institute for Sustainable Energy and Resources Qingdao University Qingdao 266071 Shandong P. R. China
2. Key Laboratory of Clean Fuel Petrochemical Research Institute CNPC Beijing 102209 P. R. China
3. State Key Laboratory of Heavy Oil Processing and the Key Laboratory of Catalysis of CNPC China University of Petroleum Beijing 102249 P. R. China
Abstract
AbstractSpent 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 (NiSX/C) from our previous work were used to prepare nickel sulfide/hierarchical porous carbon (NiSX/HPC) for the oxygen evolution reaction (OER) through the method of carbonization, activation, and sulfurization. The results indicate that the NiSX/C converts into Ni/HPC after carbonization and activation, and then transform into NiSX/HPC by sulfurization. The optimized NiSX/HPC‐8 possesses the crystal phase of NiS2, and the high specific surface area of 1134.9 m2 g−1 with the hierarchical micro‐mesoporous structure. Besides, NiSX/HPC‐8 achieves a low overpotential of 236 mV at 10 mA cm−2, a low Tafel slope of 64.1 mV dec−1, and excellent stability. This work provides a viable method for upcycling spent catalysts to re‐constructed OER catalysts with high catalytic performance and durability.
Funder
National Natural Science Foundation of China