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

• DOI: 10.1038/s41467-025-56639-7
• Publication Date: 2025-02-03T19:03:05Z
• Authors: Jiaqi Wang; Yue Liu; Ganceng Yang; Yanqing Jiao; Youming Dong; Chungui Tian; Haijing Yan; Honggang Fu
• Keywords: Science; Q; Article

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).