Iron Nickel Sulfide Nanorods for Oxygen and Hydrogen Evolution Reaction

Abstract

The electrochemical water splitting process needs fabrication of cost‐effective transition metal‐based materials for its commercialization process. Transition metal chalcogenides are good electrocatalysts for such processes in different media. Herein, we have synthesized Iron Nickel Sulfide (FeNiS2) nanorods by one step hydrothermal method. The synthesized material performed excellent bifunctional activity i. e. Hydrogen Evolution Reaction (HER) & Oxygen Evolution Reaction (OER) in basic environment. The nanorod shaped FeNiS2 deliver its OER activity at an overpotential of 250 mV to afford current density 10 mA cm−2. It shows low Tafel slope of 99 mV/dec along with 11 h stability. Further, we have tested HER activity and the as‐prepared material shows a good overpotential of 141 mV at 10 mA cm−2 and low Tafel slope of 104 mV/dec with durability of 9 h. The electrochemical characterization suggests that FeNiS2 nanorod could be an efficient, OER and HER electrocatalyst for water splitting reaction.

Enhanced Electrochemical Catalysis: Hydrogen Evolution Using Bimetallic Sulfides on Nickel Foam

“…28 Dalai et al synthesized nickel−iron sulfide nanorods via a hydrothermal method, which exhibited 9 h durability, an excellent over-potential of 141 mV, and a low Tafel slope of 104 mV dec −1 at −10 mA cm −2 during the HER. 29 Zhang et al prepared composite multiphase electrocatalysts of nanosheet clusters WS 2 /NiS x via low-temperature solid-phase synthesis, which had an overpotential of 72 mV at −10 mA cm −2 with outstanding electrochemical stability in alkaline solutions. 30 The electrochemical catalytic efficiencies of various bimetallic sulfide catalysts for HER in an alkaline solution are compared in Table 1.…”

“…Bimetallic TMSs have attracted attention than single-component TMSs. − The inherent properties of TMSs and the synergistic effect of bimetals of bimetallic TMS effectively enhance charge transfer and active reaction sites, which promotes electrochemical performance . Dalai et al synthesized nickel–iron sulfide nanorods via a hydrothermal method, which exhibited 9 h durability, an excellent overpotential of 141 mV, and a low Tafel slope of 104 mV dec –1 at −10 mA cm –2 during the HER . Zhang et al prepared composite multiphase electrocatalysts of nanosheet clusters WS 2 /NiS x via low-temperature solid-phase synthesis, which had an overpotential of 72 mV at −10 mA cm –2 with outstanding electrochemical stability in alkaline solutions .…”