The development of efficient multifunctional catalyst remains a huge challenge due to their unsatisfactory ox-

ygen/hydrogen  intermediate species adsorption,  ineffective kinetics rate,  lack of active reaction sites. Herein,

rich-Mo edge active sites in the molybdenum carbide (Mo2C) were created through nitrogen doping, which was

used  as  cocatalyst  to  enhance  the hydrogen  evolution  reaction  (HER),  oxygen  evolution  reaction  (OER)  and

photocatalytic hydrogen evolution (PHE) of ZnIn2S4 (ZIS). Mo2C-N/ZIS affords a remarkable HER activity with a

low  overpotential  of  74 mV  as  well  as  excellent  OER  activity  with  a  reduced  overpotential  of  250 mV  at

10 mA?cm  2

. The formed Schottky junction between Mo2C-N/ZIS are responsible for the enhanced PHE/HER/

OER activity, which owns double transfer route beneficial to enhancing separation of photogenerated carriers

and  reducing  bulk/surface  recombination  of  ZIS.  Specially,  the  density  functional  theory  (DFT)  calculations

demonstrate that Mo2C-N/ZIS Schottky junction with optimal absorption energy for the hydrogen and oxygen

intermediates.