Partial carbonization and etching of ZIF-9 to construct SO42−-decorated C@NiCoFe LDH ultrathin nanosheets for efficient oxygen evolution reaction

SO 4 2− -decorated C@NiCoFe LDH was synthesized through controlled carbonization and etching of ZIF-9. C@NiCoFe–SO 4 exhibits a low overpotential of 234 mV in 0.1 M KOH for the OER due to the synergistic regulation of Fe 3+ , SO 4 2− and CoNC.