Electrodeposition of Ni–Co–Fe mixed sulfide ultrathin nanosheets on Ni nanocones: a low-cost, durable and high performance catalyst for electrochemical water splitting

Abstract

Ni–Co–Fe mixed sulfide ultrathin nanosheets obtained by electrodeposition method exhibits excellent electrocatalytic activity. The Ni–Co–Fe nanosheets require the overpotential of 106 and 207 mV to generate 10 mA cm−2 current density for the HER, and OER, respectively.

Bimetallic sulfide particles incorporated in Fe/Co-based metal–organic framework ultrathin nanosheets toward boosted electrocatalysis of the oxygen evolution reaction

“…51,53,54 Recent studies further indicate that the OER activity of Fe/ Co-based catalysts can be boosted through enhancing the adsorption of oxygenated intermediates such as *OH and *O on the surface. 35,55,56 As shown in Fig. 4c and d, the Fe/Co centers at the electron-rich state favor the enhancement of oxygen-containing intermediates for expedited OER kinetics, 16,57 evidenced by the smaller R ct and smaller Tafel slope of the CoFe-MS/MOF in comparison with the CoFe-MOF in this work.…”

Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo2O4 for Enhanced Oxygen Evolution

“…The rFNCO electrode also exhibits a very low overpotential of 246 mV even at a very high current density of 100 mA cm –2 . It is worth noting that the catalytic OER activity achieved by the rFNCO electrode is comparable or even superior to that of the recently reported state-of-the-art non-precious-metal oxide-based electrocatalysts (Figure c). − Furthermore, the intrinsic activity of the samples was assessed by normalizing the geometrical current density using the corresponding ECSA, as shown in ECSA-based LSV curves (Figure S7). The normalized LSV curves revealed that the intrinsic OER catalytic activity of the samples followed the same order of rFNCO > FNCO > NCO, as observed in the geometrical area-based voltammograms.…”

Rational design of NiFe alloys for efficient electrochemical hydrogen evolution reaction: effects of Ni/Fe molar ratios

“…3a that the surface morphology of NiFe coatings deposited at low concentrations of Ni, (Ni/Fe, 1 : 3) presents in the form of micro-nanocones structure which were similar to those reported in the literature. 34,35 At an equimolar concentration ratio, it can be observed that the surface morphology of NiFe (1 : 1) coatings is found to be agglomerate that is distributed homogenously over the copper substrate. In contrast, at high Ni concentrations (Ni/Fe, 3 : 1), the formation of vertically aligned nanosheet array structures are observed.…”