In-situ growth of hierarchically porous FeNi2S4/Ti3C2Tx nanosheets arrays on Ni-Fe foam for overall water splitting

Ti3C2Tx nanosheets arrays sandwiched with FeNi2S4 nanoparticles are in-situ grown on Ni-Fe foam (FeNi2S4-Ti3C2Tx@NFF) via a facile one-pot hydrothermal route. The as-prepared FeNi2S4-Ti3C2Tx@NFF exhibits simultaneously excellent catalytic activity towards oxygen and hydrogen evolution reactions with low overpotentials (136 and 97 mV at 10 mA cm-2, respectively) and superior stability. Moreover, a symmetrical electrolyzer utilizing FeNi2S4-Ti3C2Tx@NFF as the anode and cathode only requires 1.51 V for overall water splitting to reach 10 mA cm-2, and can continuously operate at 20 mA cm-2 for 100 h. The outstanding catalytic performance of the catalyst can be attributed to increased active sites in the well-dispersed FeNi2S4 nanoparticles, enhanced electronic conductivity due to introduction of Ti3C2Tx nanosheets, strong electronic coupling between Ti3C2Tx and FeNi2S4, improved mass transfer through the hierarchically porous structures and robust self-supporting configuration.