Ni3S2 Nanowires Research Articles

One-step hydrothermal synthesis of a Ni3S2-FeMoO4 nanowire-nanosheet heterostructure array for synergistically boosted oxygen evolution reaction.

A key factor for boosting oxygen evolution reaction (OER) is the design of heterostructures with steerable defects and interfaces, which can optimize the surface electronic structures and achieve efficient water splitting to produce hydrogen fuel. Herein, we propose a novel one-step hydrothermal approach to fabricate hierarchical Ni3S2 nanowires with an S-doped FeMoO4 nanosheet heterostructure array in situ on Ni-Fe foam (NFF) as a self-standing electrode for synergistically boosted OER. The metalloid Ni3S2 nanowires with good conductivity support the FeMoO4 nanosheets and act as high-speed paths for the charge transfer. Numerous ultrathin S-doped FeMoO4 nanosheets are uniformly distributed on each Ni3S2 nanowire to form heterostructures with larger specific surface area and more revealable active sites, and a strong synergistic effect is created at the heterostructure interfaces to further promote the OER dynamics. Additionally, the NFF serves as the conductive support substrate and simultaneously provides the Ni and Fe sources for the self-growing Ni3S2-FeMoO4, leading to a structurally-integrated electrode with low contact resistance, fast mass transfer, and good stability. Therefore, the Ni3S2-FeMoO4/NFF electrode offers a low overpotential of 331 mV to achieve 500 mA cm-2 and long-term stability at 100 mA cm-2 level for more than 40 h. This work provides insight into the heterostructure of molybdate and sulfide, and a deep understanding of the significance of the synergism in OER operation.

Lithium Dredging and Capturing Dual‐Gradient Framework Enabling Step‐Packed Deposition for Dendrite‐Free Lithium Metal Anodes

AbstractDue to the sterile lithium affinity and poor Li+ regulation ability, lithium metal tends to deposit on the top of substrate materials, which lowers the space utilization and deteriorates the dendrites growth, further increasing the risk of short circuits. It is necessary to guide lithium deposition and adjust Li+ flux at the base of substrate toward alleviating those issues of lithium metal anodes (LMAs). Herein, a dredging and capturing dual‐gradient framework is conveniently fabricated toward inducing the Li+ migration and deposition. The dual‐gradient framework combined with upper Ni3S2 nanowires with lower Li+ migration barrier and bottom Ni2P nanowires with stronger Li affinity, such reasonable distribution of components conquers the ionic concentration gradient to acquire a “step‐packed” lithium deposition mode. Moreover, the in situ formation of Li2S/Li3P‐enriched SEI further promotes Li+ transport to the interior framework. Consequently, a high average Coulombic efficiency of 98% over 230 cycles and a lifespan of 180 h (10 mA cm−2, 5 mAh cm−2) are achieved. The LiFePO4 full cells also exhibit a considerable capacity retention. This work provides a feasible strategy of step‐packing lithium deposition for significant framework design insight to boost practical lithium metal batteries (LMBs) development.

Surface charge induced self-assembled nest-like Ni3S2/PNG composites for high-performance supercapacitors

The paper presents a self-assembly approach to synthesize Ni3S2/N, P co-doped graphene (PNG) composite electrode materials for supercapacitors with high energy storage performance and structural stability. Innovatively, the self-assembly approach is induced via the surface charge effect utilizing a two-step hydrothermal method. The doping of nitrogen (N) and phosphorus (P) atoms regulates the surface charge distribution on graphene nanosheets. Therefore, in the synthesized Ni3S2/PNG heterostructures, Ni3S2 nanowires are interwoven into nests and uniformly attached to PNG. The design of the electrode materials with such a special structure not only supports each other to improve the stability of the materials but also facilitates the rapid diffusion of electrolyte ions. Based on the advantages of composition and structure, Ni3S2/PNG has a high specific capacitance of 1117C g−1 at a current density of 1 A/g and excellent rate performance. The asymmetric supercapacitors (ASC) assembled with Ni3S2/PNG and PNG as positive and negative materials respectively have a high energy density of 62 Wh kg−1 at a power density of 158 W kg−1.

Integrated core-shell assembly of Ni3S2 nanowires and CoMoP nanosheets as highly efficient bifunctional electrocatalysts for overall water splitting

A paradigm for the rational design of active, abundant, and inexpensive bifunctional electrocatalysts with acceptable electrochemical energy conversion rates has yet to be achieved. Here, we describe the assembly of a superior bifunctional electrocatalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities based on a CoMoP/Ni3S2 multicomponent, heterointerface consisting of a freestanding electrocatalyst prepared by hydrothermal-phosphidation, consisting of one-dimensional Ni3S2 covered with Cereus cactus–like hierarchical CoMoP nanosheets. The resulting three dimensional CoMoP/Ni3S2 core-shell heterostructure exhibited remarkable HER and OER electrocatalysis, benefiting from modulated electronic structures, rapid mass diffusion, reduced charge-transfer resistance, and a larger electrochemically active surface area. Due to these superior functionalities, the CoMoP/Ni3S2 requires only 96.8 mV (at η10) for HER catalysis and 270 mV (at η50) for an OER process. Furthermore, a stable water-splitting device using CoMoP/Ni3S2 for both the anode and cathode required a low cell voltage of 1.54 V at 10 mA cm−2. This work represents a significant advance in interface construction of transition-metal phosphide/sulfide for long-term water splitting.

In Situ Preparation of Three-Dimensional Porous Nickel Sulfide as a Battery-Type Supercapacitor.

A one-step sulfurization method to fabricate Ni3S2 nanowires (Ni3S2 NWs) directly on a Ni foam (NF) was developed as a simple, low-cost synthesis method for use as a supercapacitor (SC), aimed at optimizing energy storage. Ni3S2 NWs have high specific capacity and are considered a promising electrode material for SCs; however, their poor electrical conductivity and low chemical stability limit their applications. In this study, highly hierarchical three-dimensional porous Ni3S2 NWs were grown directly on NF by a hydrothermal method. The feasibility of the use of Ni3S2/NF as a binder-free electrode for achieving high-performance SCs was examined. Ni3S2/NF exhibited a high specific capacity (255.3 mAh g-1 at a current density of 3 A g-1), good rate capability (2.9 times higher than that of the NiO/NF electrode), and competitive cycling performance (capacity retention of specific capacity of 72.17% after 5000 cycles at current density of 20 A g-1). Owing to its simple synthesis process and excellent performance as an electrode material for SCs, the developed multipurpose Ni3S2 NWs electrode is expected to be a promising electrode for SC applications. Furthermore, the synthesis method of self-growing Ni3S2 NW electrodes on 3D NF via hydrothermal reactions could potentially be applied to the fabrication of SC electrodes using a variety of other transition metal compounds.

Efficient reduction of Cr(VI) and elimination of total Cr with S-bridged Ni3S2/MoS2 nanowire electrode

Electrochemical reduction of Cr(VI) is eco-friendly and cost-effective for eliminating the environmental risk of Cr-contaminated water. Herein, a novel Ni3S2/MoS2 nanowire electrode with a unique stem-leaf structure was synthesized for this purpose. Self-supported ultra-long Ni3S2 nanowires bearing MoS2 nanoflakes were in-situ grown from Ni foam with a hydrothermal method, in which Ni3S2 and MoS2 grow accompanied with each other by sharing some S atoms. Consequently, highly conductive out-stretched MoS2 nanoflakes wrap the Ni3S2 nanowires, providing aligned pathways for directional electron transfer and huge networks for the efficient reduction of Cr(VI) and high uptake of generated Cr(OH)3. The highest Cr(VI) removal rate attained at − 1.2 V approaches 0.005 mg/cm2 min, and elimination efficiency of total Cr is high up to 90.81 %. Although the adsorbed Cr(OH)3 on Ni3S2/MoS2 decreases the activity after repeated runs, the electrode can be restored by a simple pickling process with dilute acid, which has promising application prospects in the electrochemical reduction of Cr-contained wastewater.

Ni3S2 nanowires filled carbon nanotubes of ultra-high quality: Synthesis methods, structure, and electrical properties

The synergy between the host carbon nanotube (CNT) and the guest filler distinguishes the filled CNTs as hybrid nanomaterials with unique properties. Many materials have been filled inside the CNT cores using several strategies; however, a reliable filling method to encapsulate transition metal sulfide nanowires inside the CNTs is still lacking. An in situ method is developed for the first time to synthesize the Ni3S2 nanowires filled CNTs (Ni3S2@CNTs), and their fundamental properties are investigated. Electron microscopy results demonstrate a core-shell structure of Ni3S2@CNT, i.e., a CNT filled with a continuous and single-crystalline, rhombohedral Ni3S2 nanowire up to several micrometers in length. An exceptionally low value of the ratio between the intensities of D and G bands (ID/IG = 0.26) in the Raman spectroscopy measurements suggests that Ni3S2@CNTs are very well graphitized, possessing an ultra-high quality. A mean resistivity of 6.1 × 10−5 Ωm is estimated using both two probe and four-point probe measurements on individual Ni3S2@CNTs. Also, a diameter selective electrical breakdown or emptying of the filled nanotube channel is observed as higher currents pass through an individual Ni3S2@CNT.

Integrating Amorphous Molybdenum Sulfide Nanosheets with a Co9S8@Ni3S2 Array as an Efficient Electrocatalyst for Overall Water Splitting.

It is highly challenging to design low-cost, efficient electrocatalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, a hierarchical heterostructure was constructed on three-dimensional (3D) Ni foam, which contains Ni3S2 nanorods decorated with both Co9S8 and amorphous MoSx nanosheets and Ni3S2 nanowires decorated with amorphous MoSx nanosheets, namely, MoSx@Co9S8@Ni3S2/NF. The synergistic effects from the strong interactions of the heterointerface and unique hierarchical heterostructure endow the MoSx@Co9S8@Ni3S2/NF with abundant active sites and effective mass and electron transport pathways, resulting in excellent activity toward both HER and OER in 1 M KOH. It only gives a low overpotential of 76.5 mV to achieve 10 mA cm-2 for HER and a low overpotential of 310 mV to achieve 100 mA cm-2 for OER. Based on the superior catalytic activity of MoSx@Co9S8@Ni3S2/NF for OER and HER, we demonstrated the activity of overall water splitting using MoSx@Co9S8@Ni3S2/NF as both the anode and cathode. It shows a higher catalytic activity for overall water splitting with a low cell voltage of 1.52 V at 10 mA cm-2 than commercial Pt/C/NF||IrO2/NF (1.61 V) and superior stability. This work provides a platform for the design and preparation of efficient electrocatalysts with various hierarchical heterostructures.

Fe-doped and sulfur-enriched Ni3S2 nanowires with enhanced reaction kinetics for boosting water oxidation

Exploring cost-effective and highly-active oxygen evolution reaction (OER) electrocatalysts is a pressing task to propel water electrolysis for green hydrogen production. Herein, we constructed a class of Fe-doped and S-enriched Ni3S2 nanowires electrocatalysts for optimizing the target intermediates adsorption to decrease the OER overpotentials at various current densities. The optimal Ni3S2-1.4%Fe electrocatalyst possesses the most active sites and exhibits an ultralow overpotential of 190 mV at 10 mA cm−2 with an excellent stability of > 60 h, exceeding the majority of recently-reported Ni3S2-based electrocatalysts. The trivalence Fe-doping not only reduces the electron density of the Ni center, but also enables the sulfur enrichment on the Ni3S2 surface, which greatly improves the intrinsic activity and the number of target intermediates (∗OOH). A novel methanol-assisted electrochemical evaluation further reveals that the Ni3S2-1.4%Fe electrocatalyst demonstrates a weaker binding ability to ∗OH with the rapid generation of ∗OOH species, and thus gives a lower apparent activation energy compared with the surface sulfur reduced ones. This work provides a new perspective for regulating the adsorption of intermediates through doping strategy.

Facile In Situ Synthesis of Co(OH)2-Ni3S2 Nanowires on Ni Foam for Use in High-Energy-Density Supercapacitors.

Ni3S2 nanowires were synthesized in situ using a one-pot hydrothermal reaction on Ni foam (NF) for use in supercapacitors as a positive electrode, and various contents (0.3−0.6 mmol) of Co(OH)2 shells were coated onto the surfaces of the Ni3S2 nanowire cores to improve the electrochemical properties. The Ni3S2 nanowires were uniformly formed on the smooth NF surface, and the Co(OH)2 shell was formed on the Ni3S2 nanowire surface. By direct NF participation as a reactant without adding any other Ni source, Ni3S2 was formed more closely to the NF surface, and the Co(OH)2 shell suppressed the loss of active material during charging–discharging, yielding excellent electrochemical properties. The Co(OH)2–Ni3S2/Ni electrode produced using 0.5 mmol Co(OH)2 (Co0.5–Ni3S2/Ni) exhibited a high specific capacitance of 1837 F g−1 (16.07 F cm−2) at a current density of 5 mA cm−2, and maintained a capacitance of 583 F g−1 (16.07 F cm−2) at a much higher current density of 50 mA cm−2. An asymmetric supercapacitor (ASC) with Co(OH)2–Ni3S2 and active carbon displayed a high-power density of 1036 kW kg−1 at an energy density of 43 W h kg−1 with good cycling stability, indicating its suitability for use in energy storage applications. Thus, the newly developed core–shell structure, Co(OH)2–Ni3S2, was shown to be efficient at improving the electrochemical performance.

Defective Ni3S2 nanowires as highly active electrocatalysts for ethanol oxidative upgrading

Defective Ni3S2 nanowires as highly active electrocatalysts for ethanol oxidative upgrading

One-Pot Synthesis of Glucose-Derived Carbon Coated Ni3S2 Nanowires as a Battery-Type Electrode for High Performance Supercapacitors.

We report a novel Ni3S2 carbon coated (denoted as NCC) rod-like structure prepared by a facile one-pot hydrothermal method and employ it as a binder free electrode in supercapacitor. We coated carbon with glucose as carbon source on the surface of samples and investigated the suitable glucose concentration. The as-obtained NCC rod-like structure demonstrated great performance with a huge specific capacity of 657 C g−1 at 1 A g−1, preeminent rate capability of 87.7% retention, the current density varying to 10 A g−1, and great cycling stability of 76.7% of its original value through 3500 cycles, which is superior to the properties of bare Ni3S2. The result presents a facile, general, viable strategy to constructing a high-performance material for the supercapacitor applications.

α‐Co(OH)2 Thin‐Layered Cactus‐Like Nanostructures Wrapped Ni3S2 Nanowires: A Robust and Potential Catalyst for Electro‐oxidation of Hydrazine

AbstractIt is of significant urgency to fabricate highly active catalysts for electro‐oxidation of hydrazine for application in direct hydrazine fuel cells (DHFCs). Thus, in this work we grow three‐dimensional (3‐D) α‐Co(OH)2 thin‐layered cactus‐like nanostructures (shell) on the surface of Ni3S2 nanowires (core) enveloped nickel (Ni) foam substrate. HRTEM images clearly reveal that the α‐Co(OH)2 thin‐layered cactus‐like nanostructures (shell) are evenly surrounded on the surface of Ni3S2 nanowires (core). Notably, α‐Co(OH)2/Ni3S2 thin‐layered cactus‐like nanowires modified Ni foam displays an enhanced electro‐oxidation of hydrazine (340 mA current response and the onset oxidation potential of −1.10 V) than α‐Co(OH)2 sponge‐like, and Ni3S2 nanowire structures. The obtained enhanced electro‐catalytic response is mainly due to its electron rich Ni active centers, larger electrochemically active surface area, higher electrical conductivity, and porous surface‐structure formed by growing α‐Co(OH)2 thin‐layered cactus‐like nanostructures on the Ni3S2 nanowires, henceforth increasing the inherent activity and the number of available active sites/spots. Further, the α‐Co(OH)2/Ni3S2 thin‐layered cactus‐like nanowire catalyst shows notable stability (stable for more than a week) towards electro‐oxidation of hydrazine. Thus, as fabricated cactus‐like thin‐layered α‐Co(OH)2/Ni3S2 core‐shell nanowires catalyst can be considered as potential and robust catalyst for electro‐oxidation of hydrazine.

Core/shell cable-like Ni3S2 nanowires/N-doped graphene-like carbon layers as composite electrocatalyst for overall electrocatalytic water splitting

A new core/shell 1-D nanostructure based on Ni3S2 nanowires and N-doped graphene-like carbon layers on nickel foam (i.e. Ni3S2@NGCLs/NF) has been fabricated and applied as composite electrocatalyst for oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and overall water splitting. The Ni3S2@NGCLs exhibit a unique architecture with a well-defined core–shell cable-like one-dimensional nanostructure in which NGCLs act as conductive shell and Ni3S2 nanowire as active core. The composite has a nitrogen content of 6.39% in atomic ratio. The Ni3S2@NGCLs/NF shows low overpotentials of 271 mV and 134 mV at 10 mA cm−2 in 1.0 M KOH for OER and HER, respectively. Highly durable OER and HER performances were demonstrated by 40 h chronopotentiometry and 10,000 CV cycle tests. Excellent overall water splitting electrocatalytic activity was found in a Ni3S2@NGCLs/NF‖Ni3S2@NGCLs/NF two-electrode system. Particularly, an active-phase NiOOH, a highly active substance for OER, can be controllably formed in the reaction process due to the shell structure of multi-layer carbon that slows down the dissolution of Ni3S2. Theoretical calculations suggest that Ni3S2@NGCLs/NF has a lower ΔG (H*) value of 0.51 eV for HER and lower overpotential value of 0.39 V for OER. These results suggest that the composite structure is a promising bifunctional electrocatalyst.

Ultrathin-layered MoS2 hollow nanospheres decorating Ni3S2 nanowires as high effective self-supporting electrode for hydrogen evolution reaction

High-activity and cost-effective transition metal sulfides (TMSs) have attracted tremendous attention as promising catalysts for hydrogen evolution reaction (HER). However, a significant challenge is the simultaneous construction of abundant electrochemical active sites and the fast electronic transmission path to boost a high-efficient HER. Herein, we demonstrate a facile one-step hydrothermal preparation of MoS2 hollow nanospheres decorating Ni3S2 nanowires supported on Ni foam (NF), without any other additional template, surfactant or annealing. In this three-dimensional (3D) heterostructure, the ultrathin-layered MoS2 hollow nanospheres contribute to the promotion of the total surface area and the electrochemical active sites. Meanwhile, the Ni3S2 nanowires are beneficial to the high electrical conductivity. Consequently, the optimized MoS2/Ni3S2/NF-200-24 electrocatalyst presents an extremely superior HER activity to that of individual MoS2/NF and Ni3S2/NF. The HER overpotentials are 85 mV at 10 mA cm−2 and 189 mV at 100 mA cm−2, which are also comparable with the state-of-the-art 20% Pt/C/NF electrode at both low and high current.

Free-standing Ni3S2 nanowire derived from in-situ synthetized coordination supramolecular as electrode materials for high performance asymmetric supercapacitors

It is of great interest to explore suitable methods to prepare micro/nano-structured electrode materials that possess specific morphologies. Herein, free-standing Ni3S2 nanowires on Ni foam are successfully prepared through a simple two-step approach, which involves in-situ growth of coordination supramolecular nanowires (Ni-CSN) followed by subsequent sulfidation. The as-prepared Ni3S2 nanowires are chosen as binder-free electrodes for supercapacitor with good electrochemical capacitive performance, which displays a high capacitance of 5.8F/cm2 at 5 mA/cm2, and still possesses 2.9F/cm2 at a much higher current density of 30 mA/cm2. The Ni3S2 nanowires electrode also shows long-term cycling with capacitance retention of 83.7% after 5000 cycles. Moreover, an asymmetric supercapacitor by employing the Ni3S2 nanowires as cathode, activated carbon (AC) as anode is fabricated, which delivers a high energy density of 2.15 mWh/cm3 at a power density of 1.05 W/cm3. The results demonstrate the coordination supramolecular derived Ni3S2 nanowires have a huge potential application in the field of supercapacitors.

Multidimensional regulation of Ni3S2@Co(OH)2 catalyst with high performance for wind energy electrolytic water

Combining renewable energy technologies with water electrolyzers to produce green hydrogen should provide a very promising strategy for future sustainable and pollution-free energy supply. In this study, 3-D Ni3S2@Co(OH)2 nanowires with core-shell structure, which are directly fabricated on nickel (Ni) foam, are developed as a bifunctional catalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In such a core-shell structure, the ultrathin α-Co(OH)2 layer of nanosheets (shell) are uniformly wrapped around the Ni3S2 nanowires (core). It is found that the obtained 3-D Ni3S2@Co(OH)2 nanowires could provide large electrochemical surface areas for the electrocatalytic reactions, and further resulted in enhanced electrocatalytic performance. The as-prepared catalyst exhibits a low onset potential and low resistance of charge transfer as well as excellent stability towards the HER. In terms of the onset potential and stability towards the OER, it is observed that the Ni3S2@Co(OH)2 is comparable to that of the RuO2. Due to its well-defined bifunctionality, it is found that an as-prepared water electrolyzer with Ni3S2@Co(OH)2 as a bifunctional catalyst for HER and OER could deliver a constant cell voltage of 1.64 V at the current density of 10 mA cm−2 for 100 h.

Enhanced Li-Storage of Ni3 S2 Nanowire Arrays with N-Doped Carbon Coating Synthesized by One-Step CVD Process and Investigated Via Ex Situ TEM.

In this work, a facile strategy for the construction of single crystalline Ni3 S2 nanowires coated with N-doped carbon shell (NC) forming Ni3 S2 @NC core/shell arrays by one-step chemical vapor deposition process is reported. In addition to the good electronic conductivity from the NC shell, the nanowire structure also ensures the accommodation of large volume expansion during cycling, leading to pre-eminent high-rate capacities (470 mAh g-1 at 0.05 A g-1 and 385 mAh g-1 at 2 A g-1 ) and outstanding cycling stability with a capacity retention of 91% after 100 cycles at 1 A g-1 . Furthermore, ex situ transmission electron microscopy combined with X-ray diffraction and Raman spectra are used to investigate the reaction mechanism of Ni3 S2 @NC during the charge/discharge process. The product after delithiation consists of Ni3 S2 and sulfur, suggesting that the capacity of the electrode comes from the conversion reaction of both Ni3 S2 and sulfur with Li2 S.

Precious Metal Free Materials As Efficient Catalysts for Water Splitting

Precious Metal Free Materials as Efficient Catalysts for Water Splitting Pei Kang Shen*, Zhi Qun Tian Collaborative Innovation Center of Sustainable Energy Materials, Guangxi University100 Daxue Road, Nanning 530004, Guangxi, China*E-mail address: pkshen@gxu.edu.cn Water electrolysis is a promising approach for large-scale and sustainable hydrogen production. However, its kinetics is slow and requires precious metal catalysts to efficiently operate. Therefore, great efforts are being undertaken to design and prepare low-cost and highly efficient catalysts to boost the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Currently, we developed different noble metal free materials as efficient catalysts for HER, OER, and full water splitting. For HER, the catalysts with novel nanostructures were prepared, such as carbon-encapsulated WOx (WOx@C), N-doped porous MoN nanobelts, nitrogen and fluorine dual-doped porous graphene-nanosheets, K0.4TaO2.4F0.6 nanocubes, Ni3S2 nanowires, TiN nanowires, nanoflower-like MoO2, et al. For OER catalysts, the Mo- and Fe-modified Ni(OH)2/NiOOH nanosheets, nitrogen-decorated iron-nickel sulfide nanosheets, Mo-doped NiOOH nanosheets, tantalum dioxyfluoride, pristine carbon nanotubes, graphene supported MnO2 nanowires were studied. For full water splitting, the porous WO2 hexahedral networks, heteroatoms dual doped porous graphene nanosheets, three-dimensional porous MoNi4 networks, porous MoO2 nanosheets, dye functionalized carbon nanotubes were studied. The synthesized materials displayed excellent catalytic activity for hydrogen evolution, oxygen evolution, and full water splitting, and can be applied as low cost and highly active multifunctional catalysts with excellent ORR and OER performance. The improved activity and active origin of aforementioned catalysts are clarified through experimental analysis and DFT calculation. These studies pave the way for the design and development of cheaper, highly efficiently and more durable catalysts for wider applications.

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

AbstractIt is critical to develop a highly effective and economical electrocatalyst to lower the energy losses for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this work, Fe‐doped Ni3S2 nanowires with diameters of ca. 17 nm and lengths of 1.4∼2 μm are synthesized on Ni foam through a one‐step solvothermal route for alkaline water splitting, which display notable active and excellent durability for both OER and HER under high current densities. The optimal Fe13.7%‐Ni3S2 nanowires electrode can attain 200 mA cm−2 at a fairly low overpotential of 223 mV, and 500 mA cm−2 at 245 mV toward OER. Furthermore, it yields a considerable low overpotential of 109 mV to garner 10 mA cm−2, and 246 mV for 500 mA cm−2 toward HER. The incorporation of iron simultaneously modifies the electronic structure and morphology of Ni3S2, which not only enhances the conductivity but also generates abundant active edge sites. The slight surface‐restricted oxidation of nanowires in a strongly basic electrolyte in situ generates a large number of interfaces, which enables the reactivity and durability for both OER and HER. Accordingly, an alkaline water electrolyzer with two Fe13.7%‐Ni3S2 electrodes only requires a low cell voltage of 1.53 V to achieve 10 mA cm−2, and 1.95 V to 500 mA cm−2 with striking stability. The as‐prepared Fe‐doped Ni3S2 nanowires can be potentially utilized for actual water electrolysis under high current densities.