Abstract
In this work, Ni-Al/layered double hydroxide is decorated on reduced graphene oxide (Ni-Al/LDH#rGOs) and ruthenium oxide is decorated on the surface of exfoliated graphene oxide (RuO2-EGO). Then, RuO2-EGO is used to synthesize a modified LDH as Ni-Al/LDH#RuO2-EGO. The structures and compositions of the nanohybrids, including Ni-Al/LDH#rGOs, RuO2-EGO, and Ni-Al/LDH#RuO2-EGO are verified using different techniques such as transmission electron microscopy, X-ray diffraction spectroscopy, FT–IR and Brunauer–Emmett–Teller. In a second stage of the study, the nanohybrids are investigated for their electrochemical hydrogen generation capabilities. Also, due to the instability of LDHs in acidic media, chemical etching of Ni-Al/LDH#RuO2-EGO is used to prepare three-dimensional RuO2-EGO (TD-RuO2-EGO). Electrochemical results show that while TD-RuO2-EGO nanohybrid is superior in electrocatalytic activity to the other nanohybrids investigated, its hydrogen generation properties including onset potential, Tafel slope and stability are comparable with those of commercial Pt/C.
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