The electronic structure of active sites is critically important for electrochemical reactions. Here, the authors report a facile approach to independently regulate the electronic structure of Fe in Ni 0.75 Fe 0.25 Se 2 by P doping. The resulting electrode exhibits superior catalytic performance for the oxygen evolution reaction (OER) showing a low overpotential (238 mV at 100 mA cm −2 , 185 mV at 10 mA cm −2 ) and an impressive durability in an alkaline medium. Additionally, the mass activity of 328.19 A g −1 and turnover frequency (TOF) of 0.18 s −1 at an overpotential of 500 mV are obtained for P─Ni 0.75 Fe 0.25 Se 2 which is much higher than that of Ni 0.75 Fe 0.25 Se 2 and RuO 2 . This work presents a new strategy for the rational design of efficient electrocatalysts for OER.

Rational design and constructing earth-abundant electrocatalysts for efficient electrocatalytic water splitting is a crucial challenge. Herein, we report a simple and efficient one-step electrochemical synthetic route of the NiFe2O4@FeOOH composite electrocatalyst for the oxygen evolution reaction. The unique morphology of the NiFe2O4 nanoflowers loaded on FeOOH nanosheets allows more active sites to be exposed and promote charge transfer as well as gas release, and the resulting electrode enables a current density of 10 mA cm−2 at a low overpotential of 255 mV with outstanding stability at a current density of 100 mA cm−2 for 300 h.

The development of low‐cost and high‐efficiency electrocatalysts for the oxygen evolution reaction (OER) is essential for a number of applications in the field of energy conversion and storage. Herein, we present an efficient OER electrocatalyst in the form of thin (Fe,Ni)9S8 nanosheets (FNS NSs) anchored on a three‐dimensional (3D) conductive substrate of Fe/Fe3O4 nanoislands/carbon cloth (Fe NIs/CC). The resulting electrode exhibits an impressive OER performance with a low overpotential of 147 mV at 10 mA cm−2 and a Tafel slope of 29.8 mV dec−1 in 1 M KOH alkaline solution. The enhanced performance is ascribed to the thin nanosheet structure with ample active sites, the high conductivity of the substrate, and the 3D structure, which endow the electrode with a large specific surface area and more catalytic active sites. Study of the kinetic process reveals that the incorporation of Fe from the substrate can reduce the kinetic barrier of OER, allowing for a faster reaction rate.