Modulation of oxygen intermediates in the oxygen evolution
reaction
(OER) tends to be an effective method for intensifying OER activity.
In this paper, NiCo nanolayered double hydroxide (NC-LDH)-decorated
FeNi bimetallic metal–organic framework (FN-MIL) heterostructures
were constructed for enhanced OER performance. Various characteristics
including Raman and Fourier-transform infrared spectra, X-ray diffraction
patterns, scanning and transmission electron microscopy images, and
X-ray photoelectron spectroscopy spectra help to explore the composition
and microstructure. The band gap of samples was discussed using Mott–Schottky
curves and Tauc plots to analyze the interfacial electron transfer
driven by the energy level difference, resulting in the formation
of electron-rich and electron-deficient regions at the interface and
realizing the directed modulation of oxygen intermediates. The as-prepared
composite catalyst revealed excellent OER performance, long-term stability,
a high faradic efficiency of 97.8%, and a low potential of 244 mV
at 10 mA cm–2 (without iR-compensation). Interestingly,
the catalyst maintained high OER activity in seawater containing 1
M KOH due to its favorable resistance to chloride ions, suggesting
an appealing prospect in practical application.