Fe‐Incorporated Ni₃S₄/NiS₂Nanocomposite as an Efficient Electrocatalyst for Alkaline Water Oxidation

Abstract

We report the development of iron-incorporated nickel sulfide (FeÀ Ni 3 S 4 /NiS 2 ) nanocomposite through sulfurization of iron incorporated nickel hydroxide precursor by using simple solvothermal method. The formation of Ni 3 S 4 / NiS 2 mixed-phase material was confirmed by PXRD analysis and the presence of multiple oxidation states of Ni (II and III) and incorporated Fe (III) was revealed by XPS studies. The electrochemical studies demonstrated that FeÀ Ni 3 S 4 /NiS 2 electrocatalyst has a high catalytic activity towards alkaline OER, as it requires only 280 mV overpotential to achieve the benchmark current density of 10 mA/cm 2 geo . The superiority of the catalyst was exhibited by low charge transfer resistance of about 6 Ohms, along with low Tafel slope of 43 mV dec À 1 . Further, the observed long-term stability for 72 h and remarkable Faradaic efficiency with 99% indicate good durability and excellent selectivity towards OER, respectively. The superior activity of FeÀ Ni 3 S 4 /NiS 2 is attributed to fast kinetics and low charge transfer resistance of the material facilitating the generation of active catalyst.

Exploring the electrocatalytic prowess of a synergistic 1T-MoS2-metallic Ni composite towards alkaline hydrogen evolution

“…This catalytic transformation is analogous to previous nickel chalcogenide literature where catalytic materials are usually converted into active NiOOH species during the OER. 76,79–81 The post-stability EDS study of NiS revealed the presence of O and the absence of S, which additionally supports the etching of sulfur moieties during OER and validates the XPS results (Fig. S38, ESI†).…”