Oriented interlayered charge transfer in NiCoFe layered double hydroxide/MoO₃ stacked heterostructure promoting the...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• The oxygen evolution reaction (OER) is critical for water electrolysis but is limited by catalyst efficiency and stability.
• Earth-abundant OER catalysts require further optimization for improved activity and durability.

Purpose of the Study:

• To develop a highly efficient and stable OER catalyst using a novel heterostructure.
• To enhance the catalytic activity and electronic structure for improved water electrolysis.

Main Methods:

• Fabrication of a two-dimensional (2D) NiCoFe layered double hydroxide (LDH)/MoO3 stacked heterostructure via electrostatic-driven self-assembly.
• Characterization of the heterostructure's surface morphology, active sites, and electronic properties.

Main Results:

• The 2D heterostructure exhibits a rough surface with abundant reactive sites for pre-oxidation.
• Multi-metal synergy and oriented charge transfer enhance intrinsic OER activity.
• The catalyst shows low overpotential, high current density, and excellent operational stability.

Conclusions:

• The NiCoFe LDH/MoO3 heterostructure serves as a highly efficient OER catalyst.
• The design strategy offers a promising pathway for developing advanced electrocatalysts for water splitting.