W-Doped Ni₃S₂ Nanoparticles Modified with NiFeLa Hydroxide for Hydrogen Evolution

Abstract

For achieving long duration and high efficiency of hydrogen evolution reaction (HER) catalysts, the key mainly lies in constructing porous structures, improving conductivity, and tailoring chemical components. Inspired by this, we in situ deposited W-doped Ni 3 S 2 nanoparticles modified with NiFeLa hydroxide on Ni foam (NF). Our work primarily concentrates on optimizing the dosage of W element and constructing open nanostructures with rich active sites. The internal W-doped Ni 3 S 2 nanoparticles enable high conductivity, and the outer NiFeLa hydroxide nanosheets form more active sites, which help to monitor the electronic structure and generate synergistic effects. Both optimization of tungsten hexachloride dosage and epitaxial growth of NiFeLaOH nanosheets greatly ameliorate the surface active area, conductivity, and electronic structure of the hybrid nanomaterial. When directly applied to alkaline HER catalytic systems, the resulting catalyst presents favorable electrochemical performance, such as low HER overpotentials (67 mV at 10 mA cm −2 and 330 mV at 552 mA cm −2 ). Remarkably, after a duration of 40 h, the catalytic activity presents pretty slight attenuation (amplification of ∼15 mV for overpotential), which indicates its ultralong stability. This research introduces an effective method to tune electrocatalytic performance by doping W element into Ni 3 S 2 and coupling with NiFeLa hydroxide.

Modulation of the morphology and electronic structure of Ni3S2 nano-forests via P and Mo co-doping in polyoxometalates to promote the urea oxidation reaction

“…Compared with Ni 3 S 2 @NF, the appearance of many breaks in the lattice fringes in Mo–Ni 3 S 2 @NF and P–Mo–Ni 3 S 2 @NF manifests the weakened crystallinity after doping. 35 In EDS, the Ni, S, Mo, and P elements are uniformly distributed on the P–Mo–Ni 3 S 2 @NF electrode surface (Fig. 3h), and the atomic ratio of the Mo and P in the surface of the P–Mo–Ni 3 S 2 @NF electrode is close to 12 : 1, which matches well with the atomic ratio of Mo to P in the precursor PMo 12 .…”

One-Step Hydrothermal Synthesis of Mo-Doped Ni3S2 Nanorods for Efficient Hydrogen Evolution Reaction

“…Meanwhile, the peaks of 852.52 and 869.71 eV correspond to 2p 3/2 and 2p 1/2 of Ni 0+ . In addition, the two broad peaks at 861.33 and 879.18 eV indicate the satellite peaks of Ni . It is worth noting that the Ni peak position of Mo-Ni 3 S 2 NRs shifts toward higher binding energy compared to Ni 3 S 2 .…”

“…39 In addition, the two broad peaks at 861.33 and 879.18 eV indicate the satellite peaks of Ni. 40 It is worth noting that the Ni peak position of Mo-Ni 3 S 2 NRs shifts toward higher binding energy compared to Ni 3 S 2 . Figure 5d presents the peaks of S 2p at 161.45 and 162.73 eV, which are attributed to S 2p 3/2 and S 2p 1/2 .…”

Spherical V-doped nickel–iron LDH decorated on Ni3S2 as a high-efficiency electrocatalyst for the oxygen evolution reaction

“…31,32 Nickel sulfide (Ni 3 S 2 ) displays high catalytic activity and excellent electrical conductivity, and makes the electrical contact between the catalyst and conductive substrate closer, which is beneficial for the electrocatalytic dynamics and durability and thus can be used as a desirable conductive substrate. [33][34][35][36] Based on the above views, we coupled the defective, ultrathin V-NiFe LDH nanosheets with Ni 3 S 2 nanosheets, integrated three effective strategies into a catalyst, and designed a wonderful 3D nanosized spherical V-NiFe LDH@Ni 3 S 2 electrocatalyst. Electrochemical results show that V-NiFe LDH@Ni 3 S 2 exhibits prominent electrocatalytic properties and structural stability for the OER.…”