WANG Hui;YU You-Xing
School of Material Science and Engineering, Beihang University;School of Material Science and Engineering, Beihang University
Surface modification of Fe 3N nanoparticles by KOH solution under electrification conditions was carried out, and the effect of alkalization on the catalytic performance of Fe 3N nanoparticles was investigated. Morphology and composition of Fe 3N nanoparticles and alkalized Fe 3N nanoparticles were characterized by XRD, TEM, EDX, XPS, Raman spectra, and Fourier transform infrared spectroscopy. Electrocatalytic hydrogen evolution reaction (HER) performance of Fe 3N nanoparticles and alkalized Fe 3N nanoparticles was analyzed by time-current curve, linear sweep voltammetry, Tafel slope, AC impedance method, and CV curve. It was found that for alkalized Fe 3N nanoparticles, their average grain sizes decreased from (80 ± 10) nm to (70 ± 10) nm. Their morphology changed from broken chain structure to elliptical structure, while their phase changed partly from ε-Fe 3N to α-Fe 2O 3, which brought about more exposed electrocatalytic activity sites when compared with the Fe 3N before alkalization. Overpotential at 10 mA/cm 2 was reduced from 0.429 V to 0.204 V and Tafel slope was reduced from 103 mV/dec to 95 mV/dec. Low opening voltage, small Tafel slope, low overpotential, small AC impedance and large electrochemically active surface area were achieved by the alkalized Fe 3N nanoparticles, demonstrating that alkalized Fe 3N is a promising excellent electrocatalyst for water splitting.
Fe 3N nanoparticles;KOH alkalization treatment;electrocatalysis;hydrogen evolution reaction
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