Tungstate Intercalated NiFe Layered Double Hydroxide Enables Long-Term Alkaline Seawater Oxidation.

Renewable electricity-driven seawater splitting presents a green, effective, and promising strategy for building hydrogen (H)-based energy systems (e.g., storing wind power as H), especially in many coastal cities. The abundance of Cl in seawater, however, will cause severe corrosion of anode catalyst during the seawater electrolysis, and thus affect the long-term stability of the catalyst. Herein, seawater oxidation performances of NiFe layered double hydroxides (LDH), a classic oxygen (O) evolution material, can be boosted by employing tungstate (WO ) as the intercalated guest. Notably, insertion of WO to LDH layers upgrades the reaction kinetics and selectivity, attaining higher current densities with ≈100% O generation efficiency in alkaline seawater. Moreover, after a 350 h test at 1000 mA cm, only trace active chlorine can be detected in the electrolyte. Additionally, O evolution follows lattice oxygen mechanism on NiFe LDH with intercalated WO .