Constructing self-supported heterostructure of FeOOH modified Ni(OH)2 nanosheets on titanium substrate for high-efficiency oxygen evolution reaction.

Water splitting, as an ideal technology for sustainable production of hydrogen, is considered to achieve green hydrogen production. Oxygen evolution reaction (OER) has a slower kinetic process, the creation of OER catalysts with high efficiency and low overpotential is currently a hot research topic. Herein, a new self-supported Ti@Ni(OH)₂/FeOOH heterostructure electrocatalyst, consisting of Ni(OH)₂ lamellar structure generated by solvothermal method on titanium mesh and then FeOOH nanoparticles grown by electrodeposition method, shows excellent OER performance with low charge transfer resistance, corresponding to 10 mA cm⁻² current density, a minor Tafel slope of 42.9 mV dec⁻¹, and excellent durability in 1.0 M KOH electrolyte, maintaining a constant voltage with little change above 48 h. We demonstrate that the self-supported heterostructure facilitates the fine-tuning of electronic structure and the synergy effect between Ni and Fe-based components. [ABSTRACT FROM AUTHOR]