Self-supported MoS2-Ni3S2-CNTs/NF electrodes with super-hydrophilic multistage micro-nanostructures for efficient bifunctional monolithic water splitting.

Using affordable electrocatalysts to produce hydrogen electrochemically by hydrolysis in an alkaline electrolyte is essential for addressing the energy of world crises and pollution issues. In this study, we have successfully synthesized MoS 2 -Ni 3 S 2 -CNTs/NF electrodes using a simple one-step hydrothermal method. These electrodes feature a multistage layered micro-nanostructure on nickel foam (NF) and exhibit super-hydrophilicity. The multilayered micro-nanostructure enhances the electrode's hydrophilicity, which promotes the exposure of active sites and accelerates electrolyte delivery. Notably, at a current density of 50 mA cm−2, these electrodes demonstrate excellent catalytic performance under alkaline conditions, with overpotentials of just 169 mV (approximately 0.59 times that of MoS 2 -CNTs/NF) for the hydrogen evolution reaction (HER) and 255 mV (approximately 0.57 times that of MoS 2 -CNTs/NF) for the oxygen evolution reaction (OER). Furthermore, the electrodes show remarkable stability, maintaining performance over an 8-h continuous operation at a constant overpotential. This work offers a novel approach to enhance electrocatalytic water splitting efficiency by structural and wettability manipulation, hence creating a new avenue for the generation of clean energy. • MoS 2 -Ni 3 S 2 -CNTs electrodes synthesized via a simple one-step hydrothermal method. • MoS 2 -Ni 3 S 2 -CNTs electrodes feature multistage micro- and nanostructured layered architecture. • MoS 2 -Ni 3 S 2 -CNTs exhibit outstanding bifunctional catalytic activity for water electrolysis. • CNTs incorporation creates a super-hydrophilic surface, enhancing catalytic efficiency. [ABSTRACT FROM AUTHOR]