The
development of high-performance electrocatalysts is a highly
efficient strategy to optimize the sluggish kinetic property of the
oxygen evolution reaction (OER). Herein, we synthesize a kind of nickel
foam (NF)-supported electrocatalyst composed of a one-dimensional
Co3O4 nanowire as the core and a two-dimensional
NiFe-LDH nanosheet as the shell (denoted as NiFe-60/Co3O4@NF). Fluorine is introduced into the precursor Co(OH)F
of Co3O4, which results in improved thermal
stability and significantly increased regularly distributed oxygen
vacancies, while the electrochemically deposited NiFe-LDH nanosheets
possess a crystalline/amorphous hybrid structure. As a result, the
hetero-interface mainly constituting Ni species from NiFe-LDH and
Co3O4 from Co(OH)F contributes to the interaction
between Co and Fe species and facilitates the electron transfer. Simultaneously,
the interaction between oxygen vacancies in Co3O4 and coordinatively unsaturated Fe species in the amorphous area
in NiFe-LDH is also determined, finally completing the electron backtracking.
Benefiting from these factors, only low overpotentials of 221 and
257 mV are required to deliver the current densities of 100 and 500
mA cm–2, respectively, with a quite small Tafel
slope of 34.6 mV dec–1 during OER for the well-designed
NiFe-60/Co3O4@NF electrocatalyst.
Metal-organic frameworks (MOFs) provide opportunities for the design of high-efficiency catalysts attributed to their high compositional and structural tunability. Meanwhile, the huge number of MOFs poses a great challenge to...
Hydrogen evolution reaction (HER) electrocatalysts that are free of noble metals are highly desirable for energy conversion applications. Herein, a general hydrothermal-impregnation-pyrolysis process is proposed to introduce W into Co...
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