Metal–organic
frameworks (MOFs) based oxygen-evolution reaction
(OER) catalyst is an emerging class of highly porous materials that
have become increasingly attractive to develop a highly active and
stable OER catalyst for overall water splitting. However, it suffers
from poor conductivity and inadequate active sites. Herein, we have
developed a series of hierarchical Fe-mediated Ni-based metal–organic
frameworks (Fe
x
Ni1–x
-MOF) by an adjustable hydrolysis strategy, where
the Ni-MOF is used as a template that is decorated with NiOOH active
sites. Although Ni-MOF is dissociated during the ion exchange process,
the structural integrity is kept for Fe
x
Ni1–x
-MOF as confirmed by the
electron micrographs. Moreover, the optimized Fe0.38Ni0.62-MOF catalyst not only exhibits a remarkable OER catalytic
performance with a low overpotential of 190 mV at 10 mA cm–2 but also shows a small Tafel slope of 58.3 mV dec–1 and stability. The excellent OER electrocatalytic activity can be
attributed to the unique 3D flower-like structure decorated with NiOOH
active sites induced by Fe3+ species. This novel methodology
expands a new way for the construction of highly efficient alkaline
catalytic materials.
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