Wet-chemistry topotactic synthesis of bimetallic iron–nickel sulfide nanoarrays: an advanced and versatile catalyst for energy efficient overall water and urea electrolysis

Abstract

Bimetallic iron–nickel sulfide nanowall arrays supported on nickel foam (Fe11.1%–Ni3S2/Ni foam) could efficiently drive both the overall water and urea electrolysis.

Ultralow FeIII Ion Doping Triggered Generation of Ni3S2 Ultrathin Nanosheet for Enhanced Oxygen Evolution Reaction

“…For the S 2p, the peaks at 162.2 eV and 163.5 eV are corresponding to S 2p 3/2 and S 2p 1/2 , respectively attributing to the S 2− in the Ni 3 S 2 (Figure e). The additional peak at 168.4 eV can be ascribed to the sulfate species formed by the surface oxidation in air ,,,. The XPS results of Ni 3 S 2 /NF show the same configuration with that of Fe 2.1% −Ni 3 S 2 /NF (Figure S3), suggesting the doping of Fe 3+ into Ni 3 S 2 will not change the phase structure of Ni 3 S 2 .…”

“…As shown in Figure 2c, the high resolution Ni 2p spectrum, characteristic peaks of Ni 2p 3/2 and Ni 2p 1/2 at 856.0 and 873.6 eV together with their satellite peaks at 861.5 and 879.6 eV are found, confirming Ni is in Ni 2 + state. [17,21,36] Figure 2d shows the core-level Fe 2p region spectrum and two peaks at 712.1 and 725.4 eV correspond to the Fe 2p 3/2 and Fe 2p 1/2 , respectively, indicating the presence of Fe(III). [21,22,36] For the S 2p, the peaks at 162.2 eV and 163.5 eV are corresponding to S 2p 3/2 and S 2p 1/2 , respectively attributing to the S 2À in the Ni 3 S 2 (Figure 2e).…”

“…[17,21,36] Figure 2d shows the core-level Fe 2p region spectrum and two peaks at 712.1 and 725.4 eV correspond to the Fe 2p 3/2 and Fe 2p 1/2 , respectively, indicating the presence of Fe(III). [21,22,36] For the S 2p, the peaks at 162.2 eV and 163.5 eV are corresponding to S 2p 3/2 and S 2p 1/2 , respectively attributing to the S 2À in the Ni 3 S 2 (Figure 2e). The additional peak at 168.4 eV can be ascribed to the sulfate species formed by the surface oxidation in air.…”

Fe‐Doped Ni3S2 Nanowires with Surface‐Restricted Oxidation Toward High‐Current‐Density Overall Water Splitting

“…The fitting peaks of S 2p at binding energies of 161.1, 162.2 and 163.4 eV in Figure b are coincided with S 2p 3/2 , S 2p 1/2 and Ni−S bonding of the divalent sulfide ions . The additional peak at 168.5 eV is typical for Ni−O−S species with a high oxidation state of sulfur due to the surface oxidation in air . The peak at binding energy of 705.2 eV in the Fe 2p spectrum can be assigned to the Ni auger peak, and the peaks at 711.3 and 724.4 eV are accorded with Fe 3+ (Figure c) .…”

MoFe‐Codoped Ni3S2/Ni(OH)2 Nanosheets with Large Sample Size toward High‐Performance Oxygen Evolution

“…However, such a composite has rarely been reported as yet. On the other hand, the sample area of the ever‐reported OER catalysts is usually smaller than 9.0 cm 2 due to the possible synthesis difficulty or the little effort on increasing the sample size, which is far from the requirement for future industrial applications. The synthesis of high‐efficient OER catalysts with an even larger sample size still remains a challenge.…”