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Abstract Developing high‐efficiency and cost‐effective bifunctional catalysts for water electrolysis is fascinating but still remains challenging. Thus, diverse strategies have been utilized to boost the activity toward oxygen/hydrogen evolution reactions (OER/HER) for water splitting. Among them, composition and structure engineering as an effective strategy has received extensive attention. Here, by means of a self‐sacrificing template strategy and simultaneous regulation of the composition and structure, Fe‐incorporated Ni/MoO 2 heterostructural (NiFe/Fe‐MoO 2 ) hollow nanorod arrays are designed and constructed. Benefiting from abundant catalytic active sites, high intrinsic activity, and fast reaction kinetics, NiFe/Fe‐MoO 2 exhibits superior OER (η 20 = 213 and 219 mV) and Pt‐like HER activity (η 10 = 34 and 38 mV), respectively, in 1 m KOH and alkaline seawater media. This results in attractive prospects in alkaline water and seawater electrolysis with only voltages of 1.48 and 1.51 V, and 1.69 and 1.73 V to achieve current densities of 10 and 100 mA cm −2 , respectively, superior to the Pt/C and RuO 2 pair as a benchmark. Undoubtedly, this work provides a beneficial approach to the design and construction of noble‐metal‐free bifunctional catalysts toward efficient hydrogen production from alkaline water and seawater electrolysis.
Shi et al. (Mon,) studied this question.