2D nanosheets of Mo${}_2$C/CoMoS${}_4$ as active electrocatalyst for water splitting

2D composited nanosheets of Mo${}_2$C/CoMoS${}_4$ are synthesized by a hydrothermal approach to obtain a bifunctional water-splitting electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in aqueous alkaline solution. Due to the richened defects formed on the 2D catalyst, the as-derived Mo${}_2$C/CoMoS${}_4$ exhibits high activity. At 10 mA cm${}^{-2}$, the HER and OER overpotentials of the 2D Mo${}_2$C/CoMoS${}_4$ nanosheets are just 117 and 250 mV, respectively, with the corresponding Tafel slope of 90 and 75 mV dec${}^{-1}$, near to the commercial Pt/C and IrO${}_2$. X-ray photoelectron spectroscopy proves the strong interactions between Mo${}_2$C and CoMoS${}_4$ and the Raman analysis certifies the presence of richened defects in Mo${}_2$C/CoMoS${}_4$. Moreover, the Mo${}_2$C/CoMoS${}_4$ possesses a long-term catalytic stability, showing potential application in the water splitting. (© 2021 Wiley‐VCH GmbH)