LAUSR

A series of NiSFeS/N, S co‐doped carbon (NixFeyS/NSC) for electrochemical oxygen evolution reaction (OER) were synthesized by a co‐precipitation method and followed by pyrolysis in N2 atmosphere. NiSFeS hybrid was uniformly integrated with N, S co‐doped carbon in NixFeyS/NSC. NixFeyS/NSC showed high OER catalytic activity, and the optimized Ni60Fe40S/NSC afforded an OER overpotential of ~239 mV to deliver a current density of 10 mA cm−2 and showed a corresponding Tafel slope of ~30.9 mV dec−1 in 1 M KOH. Such OER catalytic activity was not only higher than that of IrO2, but also comparable with that of the most recently reported NiFe‐based sulfides for OER. Further study indicated that hybridizing NiS with FeS resulted in a synergistic effect for OER. The hybridization increased total amount of sulfides as active species, therefore enhancing the OER catalytic activity. In addition, the hybridization benefited the formation of petal‐like morphologies that contributing much to higher electrochemically active surface area (ECSA), and also boosted the content of graphitic and N, S co‐doped carbon that improving charge transfer efficiency.