Abstract
We reported facile fabrication of a novel β-Ni(OH)2/NiFe2O4 heterostructure composite by KOH alkaline etching three-component NiFeAl-layered double hydroxides (NiFeAl-LDHs) precursor for ethanol oxidation electrocatalysis. Detailed investigation of evolution progress from NiFeAl-LDHs precursor to β-Ni(OH)2/NiFe2O4 demonstrated that growth of such composite structure underwent partial dealumination and spontaneous lattice rearrangement of NiFeAl-LDHs to form α-Ni(OH)2/NiFeAl-LDHs compound, followed by deep dealumination and topological transformation to produce β-Ni(OH)2/NiFe2O4. Compared to NiFeAl-LDHs precursor, β-Ni(OH)2/NiFe2O4 heterostructure prepared in 15 M KOH alkaline had enhanced activity (approximately 10 times) for ethanol electrocatalysis, smaller electron transfer resistance of 1.33 Ω, and increased long-term stability. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and in situ Raman spectroscopy were further performed to explore reaction mechanism and transformation process of β-Ni(OH)2/NiFe2O4 in ethanol electrocatalysis, which verified that the process of electron donating and electron receiving between NiFe2O4 and β-Ni(OH)2 realized more electron transfer and greatly improved the fuel utilization.
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