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Fluorine-Induced Selective Doping and Phase Transition Effect for FeNi Layered Double Hydroxides Towards Enhanced Oxygen Evolution Electrocatalysis
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杨
J
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S
L
DOI：10.1002/cey2.70297.png)
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Abstract
En 中文
NiFe-based layered double hydroxides (LDHs), as the most efficient oxygen evolution reaction (OER) catalysts in alkaline media, still face challenges related to limited active-site exposure and insufficient active-phase transition kinetics. In this work, we present a systematic investigation of F-doped FeNi LDHs and reveal the F− induced partial phase transition from tetragonal to hexagonal FeNi LDH, which greatly increases its performance for OER. We find that F ions tend to be incorporated into the hexagonal lattice rather than the tetragonal lattice due to the different formation energies of the F-doped structures. As a result, the optimized sample with tetragonal/hexagonal heterointerfaces exhibits exceptional activity and stability, with an overpotential of only 222 mV to afford 10 mA cm−2, surpassing most reported Fe/Ni-based catalysts. Advanced characterizations and theoretical analysis confirm that the promoted performance can be mainly attributed to interfacial charge redistribution at phase interfaces that significantly reduces the energy barrier for OER, rather than F-doping-induced electronic effect directly. This doping-induced phase-transition engineering opens a new avenue for developing advanced heterostructured materials for electrocatalytic energy conversion.
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