MXene-Assisted NiFe sulfides for high-performance anion exchange membrane seawater electrolysis

Anion exchange membrane seawater electrolysis is vital for future large-scale green hydrogen production, however enduring a huge challenge that lacks high-stable oxygen evolution reaction electrocatalysts. Herein, we report a robust OER electrocatalyst for AEMSE by integrating MXene (Ti 3 C 2 ) with NiFe sulfides ((Ni,Fe)S 2 @Ti 3 C 2 ). The strong interaction between (Ni,Fe)S 2 and Ti 3 C 2 induces electron distribution to trigger lattice oxygen mechanism, improving the intrinsic activity, and particularly prohibits the dissolution of Fe species during OER process via the Ti-O-Fe bonding effectively, achieving notable stability. Furthermore, the good retention of sulfates and the abundant groups of Ti 3 C 2 provide effective Cl - resistance. Accordingly, (Ni,Fe)S 2 @Ti 3 C 2 achieves high OER activity (1.598 V@2 A cm -2 ) and long-term durability (1000 h) in seawater system. Furthermore, AEMSE with industrial current density (0.5 A cm -2 ) and durability (500 h) is achieved by (Ni,Fe)S 2 @Ti 3 C 2 anode and Raney Ni cathode with electrolysis efficiency of 70% and energy consumption of 48.4 kWh kg -1 H 2 .