Multicomponent nickel-molybdenum-tungsten-based nanorods for stable and efficient alkaline seawater splitting.

In this work, we employ a combination of simple hydrothermal and high-temperature nitriding techniques to synthesize self-supporting N -doped carbon-coated Ni 3 N/MoO 2 /WO 2 heterojunction nanorods on a nickel foam catalyst for efficient alkaline seawater electrolysis. [Display omitted] • The NC@Ni 3 N/MoO 2 /WO 2 @NF || NiMoWO X @NF electrolyzer showed high catalytic activity. • The NC@Ni 3 N/MoO 2 /WO 2 @NF has the d -band center closest to the Fermi level. • NC@Ni 3 N/MoO 2 /WO 2 @NF and NiMoWO X @NF have η 100 of only 84 mV and 195 mV in seawater. The electrolysis of seawater for hydrogen production holds promise as a sustainable technology for energy generation. Developing water-splitting catalysts with low overpotential and stable operation in seawater is essential. In this study, we employed a hydrothermal method to synthesize NiMoWO X microrods (NiMoWO X @NF). Subsequently, an annealing process yielded a composite N -doped carbon-coated Ni 3 N/MoO 2 /WO 2 nanorods (NC@Ni 3 N/MoO 2 /WO 2 @NF), preserving the ultrahigh-specific surface area of the original structure. A two-electrode electrolytic cell was assembled using NC@Ni 3 N/MoO 2 /WO 2 @NF as the cathode and NiMoWO X @NF as the anode, demonstrating exceptional performance in seawater splitting. The cell operated at a voltage of 1.51 V with a current density of 100 mA·cm−2 in an alkaline seawater solution. Furthermore, the NC@Ni 3 N/MoO 2 /WO 2 @NF || NiMoWO X @NF electrolytic cell exhibited remarkable stability, running continuously for over 120 h at a current of 1100 mA·cm−2 without any observable delay. These experimental results are corroborated by density functional theory calculations. The NC@Ni 3 N/MoO 2 /WO 2 @NF || NiMoWO X @NF electrolyzer emerges as a promising option for industrial-scale hydrogen production through seawater electrolysis. [ABSTRACT FROM AUTHOR]