Abstract
The effective improvements in structure and composition are critical to the performances of inexpensive electrocatalysts based on transition metal chalcogenides (TMCs), especially in dye-sensitized solar cell (DSSC) and hydrogen evolution reaction (HER), which will be an ongoing challenge. Herein, a novel method of forming Ni-Fe-Mo sulfide composite electrocatalyst (denoted as Ni-Fe-MoSx) by adding molybdenum element when modifying the active sites on the surface of Ni-Fe layered double hydroxide (Ni-Fe LDH) was proposed and studied. Beginning with MIL-88A (Fe), Ni-Fe LDH was prepared by the hydrolysis of nickel and iron ions in alkaline solution, and then vulcanized by ammonium tetrathiomolybdate to synthesize Ni-Fe-MoSx electrocatalyst with hollow bipyramidal structure and rich active sites on the modified surface. Benefiting from the advantages of hollow construction and the enhanced intrinsic activity of more active sites, Ni-Fe-MoSx electrode delivered an outstanding power conversion efficiency (PCE) of 9.37% in DSSC. Accompanying with a low onset potential of 30.4 mV, its stability in acid HER could maintain well over long periods of time. The successful implementation of the scheme is expected to provide a novel avenue for synthesizing bifunctional electrocatalysts based on TMCs.
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