posted on 2023-11-13, 08:03authored byHaodong Qi, Kai Huang, Fenghongkang Pan, Rongting Ma, Cheng Lian, Honglai Liu, Jun Hu
Hydrogen production by water splitting directly from
seawater is
of great significance, where electrocatalysts with both high electrocatalytic
activity and chlorine corrosion resistance have been long sought after.
Herein, intercalation of Mo(VI) ions in NiFe layered double hydroxide
(LDH) was engineered for boosting the electrocatalytic oxygen evolution
reaction (OER). The intercalated Mo(VI) with high valence states facilitated
NiFe LDH self-reconstruction through inducing the formation of Ni3+ sites; meanwhile, its volumetric and electrostatic repulsion
synergistically inhibited the catalyst corrosion through excluding
Cl– from intercalation. As a result, the in situ
growth of Mo0.25-NiFe LDH on Ni foam required an overpotential
as low as 335 mV to deliver 500 mA cm–2 in alkaline
natural seawater with excellent stability for at least 500 h, being
one of the top electrocatalysts so far as we know. Therefore, this
convenient intercalation engineering provided a promising strategy
for seawater splitting.