Abstract
Tailoring surface composition and structures of catalysts affects their catalytic performance in hydrogen evolution reaction owing to the geometric and electronic effects. Herein, Ru nanoparticles embedded in 2D N-doped carbon nanosheets decorated with 2D Fe3O4–Fe3C heterostructures (Ru/Fe3O4–Fe3C/NC) are fabricated via pyrolysis of the mixture containing 2D-Fe2O3 nanosheets, dopamine hydrochloride, RuCl3·xH2O, and melamine. Interestingly, the good hydrogen evolution behavior is achieved on Ru/Fe3O4–Fe3C/NC with the high reactivity and stability. Ru/Fe3O4–Fe3C/NC offers an overpotential of 141 mV to realize the current density of 10 mA/cm2 in 0.5 mol/L (M) H2SO4 electrolyte. As for 1 M KOH, Ru/Fe3O4–Fe3C/NC promotes hydrogen evolution reactivity with 148 mV to achieve 10 mA/cm2. The current density slightly degrades after continuous I-t tests, verifying the good stability for Ru/Fe3O4–Fe3C/NC. The high reactivity might stem from high dispersion of Ru nanoparticles, enhanced conductivity due to doping N into carbon nanosheets, and heterointerfaces between Fe–O and Fe–C.
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