NiFe Layered Double Hydroxide Research Articles

Understanding the photothermal contribution to electrocatalysis: A case study of carbon supported NiFe layered double hydroxide

External field assisted water splitting, as a sustainable and highly-efficient route to achieving hydrogen production, has recently attracted a considerable attention in the renewable energy research field. In particular, electrocatalysts with superior light absorption ability is likely to show an excellent electrocatalytic performance under light irradiation. Herein, a composite consisting of NiFe layered double hydroxide (LDH) and carbon is prepared as an electrocatalyst for oxygen evolution reaction (OER). Compared to the pristine NiFe LDH,carbon supported NiFe layered double hydroxide (NiFe LDH@C) composite exhibits an enhanced light harvesting under light irradiation, not only increasing the local temperature of electrocatalyst but also lowering the charge transfer resistance during the OER reaction process. Consequently, the photothermal effect enables NiFe LDH@C composite to facilitate the charge transport and accelerate the reaction kinetics, thereby showing an improved OER performance in comparison to neat NiFe LDH. This work offers a new vision toward the rational design of advanced electrocatalyst for solar-assisted water electrolysis application.

Self-Supporting NiFe Layered Double Hydroxide “Nanoflower” Cluster Anode Electrode for an Efficient Alkaline Anion Exchange Membrane Water Electrolyzer

The development of an efficient and durable oxygen evolution reaction (OER) electrode is needed to solve the bottleneck in the application of an anion exchange membrane water electrolyzer (AEMWE). In this work, the self-supporting NiFe layered double hydroxides (NiFe LDHs) “nanoflower” cluster OER electrode directly grown on the surface of nickel fiber felt (Ni fiber) was synthesized by a one-step impregnation at ambient pressure and temperature. The self-supporting NiFe LDHs/Ni fiber electrode showed excellent activity and stability in a three-electrode system and as the anode of AEMWE. In a three-electrode system, the NiFe LDHs/Ni fiber electrode showed excellent OER performance with an overpotential of 208 mV at a current density of 10 mA cm−2 in 1 M KOH. The NiFe LDHs/Ni fiber electrode was used as the anode of the AEMWE, showing high cell performance with a current density of 0.5 A cm−2 at 1.68 V and a stability test for 200 h in 1 M KOH at 70 °C. The electrocatalytic performance of NiFe LDHs/Ni fiber electrode is due to the special morphological structure of “nanoflower” cluster petals stretching outward to produce the “tip effect,” which is beneficial for the exposure of active sites at the edge and mass transfer under high current density. The experimental results show that the NiFe LDHs/Ni fiber electrode synthesized by the one-step impregnation method has the advantages of good activity and low cost, and it is promising for industrial application.

Microcrystallization and lattice contraction of NiFe LDHs for enhancing water electrocatalytic oxidation

AbstractThe lattice‐oxygen‐mediated mechanism is considered as a reasonable mechanism for the electrochemical catalytic oxygen evolution reaction (OER) of NiFe layered double hydroxides (LDHs). A NiFe LDH with distinct lattice contraction and microcrystallization was synthesized via a simple one‐step method using sodium gluconate. The lattice contraction is attributed to the interaction of carbon in sodium gluconate and iron in NiFe LDH. The NiFe LDH with optimized microcrystallization and lattice contraction shows a low overpotential of 217 mV at a current density of 10 mA cm−2 and excellent durability of 20 h at a high current density of 100 mA cm−2. The results revealed that a contractive metal–oxygen bond could boost the intrinsic activity of active sites and the microcrystallization promotes an increase in the number of active sites in terms of unit area. The chemical environment of oxygen elemental characterization and resistance at different chronopotentiometry times confirm that the lattice oxygen element is indeed involved in the process of OER, supporting the lattice‐oxygen‐mediated mechanism of NiFe LDH. Density functional theory calculations reveal that contractive metal–oxygen bonds induced a reduction of the adsorption energy barrier of intermediate products, thus improving the intrinsic catalytic activity. The special characteristics of microcrystallization and lattice contraction of NiFe LDH provide a strategy to improve both the number and the intrinsic activity of active sites in a versatile manner.

Tetrafunctional electrocatalyst for oxygen reduction, oxygen evolution, hydrogen evolution, and carbon dioxide reduction reactions

BackgroundThe development of novel electrocatalysts with high efficiency, low cost, and high stability to replace platinum group metal (PGM) electrocatalysts is essential for realizing sustainable energy applications. MethodsIn this study, we synthesized a tetrafunctional electrocatalyst comprising NiFe layered double-hydroxide (LDH) nanosheets anchored on carbon-nanotube-grafted (CNT), Co3O4-embedded, and N-doped porous carbon matrices (NC) derived from zeolitic imidazolate frameworks (NiFe LDHCNT-Co3O4/NC). Significant FindingsThis electrocatalyst exhibited superior performance to PGM electrocatalysts in the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and carbon dioxide reduction reaction (CO2RR). The linear sweep voltammetry study showed that the NiFe LDHCNT-Co3O4/NC demonstrated superior performance (Eonset = 0.85 V and E1/2 = 0.79 V for ORR; Ej=10 = 1.63 V for OER; overpotential = 0.84 V) comparing to the benchmarks of Pt/C and RuO2. A rechargeable Zn–air battery (ZAB) is used to verify the performance of the developed electrocatalyst in the ORR and OER; the ZAB exhibited an ultralow charge–discharge voltage gap (0.74 V) and excellent stability (104 cycles, >1600 h@10 mA cm−2). Overall water splitting (OWS) is performed to verify the performance of the developed electrocatalyst in the OER and HER. The adopted OWS device exhibited a long and stable process (1.6 V@10 mA cm−1, 700 h). CO2 conversion is investigated for evaluating the HER and CO2RR, and an 80% faradaic efficiency of CO production and high stability are obtained (166 mA cm−2@−1.09 V). We think that the synergistic effect of the NiFe LDHs, Co3O4 nanoparticles, and nitrogen-doped carbon electrocatalyst contributes to the excellent electrocatalytic performance of NiFe LDHCNT-Co3O4/NC in the aforementioned reactions. The hydrophilic NiFe LDHs and highly mesoporous carbon matrices provide a favorable ionic pathway for achieving rapid diffusivity and efficient mass transfer while the CNTs and carbon frameworks enhance the electrical conductivity during redox processes

NiCu alloys anchored defect-rich NiFe layered double-hydroxides as efficient electrocatalysts for overall water splitting

Designing bifunctional electrocatalytic materials with non-precious metals for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) remains a tremendous challenge. NiFe layered double-hydroxide (NiFe-LDH) materialss with modifiable nanostructures and tunable electronic properties have attracted considerable attention. At present, its modification strategies mainly include single structural defect, simple material composite and so on, while there are few studies involving multiple structure defect synergy. In this work, environmental-friendly hydrothermal-electrodeposition method was employed to build oxygen defects on the surface of NiFe layered double hydroxides and anchor NiCu nanoclusters with abundant, cheap nickel foam (NF) as the conductive substrate. The synergistic effect of oxygen defects and NiCu alloys resulted in a significant increase in the exposure of active sites and an enjoyable enhancement in intrinsic electrocatalytic activity. The obtained NiFe-LDH-Vo@NiCu sample exhibits outstanding OER (244 mV@50 mA cm−2)/HER (85 mV@10 mA cm−2) performance in 1 M KOH solution. Furthermore, NiFe-LDH-Vo@NiCu presents ultra-low battery voltage of 1.54 V as well as remarkable stability as a bifunctional electrode. Finally, DFT calculations were applied to reveal the effects of the introduction of O vacancies and the anchoring of NiCu nanoclusters on the internal electronic structure of NiFe-LDH materials. In general, this research can provide new insights into designing of high performance NiFe-LDH electrocatalysts.

Three-Dimensional Coral-Like NiFe-Layered Double Hydroxides on Biomass-Derived Nitrogen-Doped Carbonized Wood as a Sensitive Probe for Nonenzymatic Urea Determination

Binder-less, self-standing, disposable, and cost-effective sensing probes are crucial for the development of next-generation nonenzymatic urea sensors (NEUSs). In the present study, three-dimensional (3D) coral-like NiFe-based layered double hydroxide (NF-LDH) microstructures were grown over the naturally inherited porous microchannels of nitrogen-doped carbonized wood (NCW). The microstructural details and chemical composition of the fabricated electrodes were examined by microscopic and spectral methods. The formation of novel 3D coral-like microarchitectures with uniformly enveloped nanoflakes was evidenced from the scanning electron microscopy measurements. Interestingly, NF-LDH exhibited a voltammetric response for urea due to the unique 3D architecture and synergistic influence between catalytically active Ni3+ sites and doped Fe3+ centers. Here, NCW serves as a catalyst-docking platform and electron-conducting medium. Such direct anchoring of catalytically active structures on conductive scaffolds eliminates the electron transfer resistance provoked by stereotypical insulating binders. Furthermore, the growth of the NF-LDH catalyst on NCW was varied with respect to the mole ratio of Ni3+ and Fe3+. Among the different mole ratios, the NF-LDH catalyst modified with Ni/Fe-0.75:0.25 showed the best sensing performance toward urea with a sensitivity of 53 μA mM–1 cm–2, a wide linear range from 0.5 to 8 mM, and a limit of detection of 0.114 mM (S/N = 3) in addition to exceptional stability and reproducibility.

Magnetic Field Enhancing OER Electrocatalysis of NiFe Layered Double Hydroxide

Magnetic Field Enhancing OER Electrocatalysis of NiFe Layered Double Hydroxide

Exploring the mechanism of the excellent catalytic activity of NiFe-layered double hydroxides in oxygen evolution reactions by modifying the iron content

Layered double hydroxides are very promising catalysts for water splitting, in particular NiFe-layered double hydroxide, which has attracted significant attention due to its excellent catalytic activity in oxygen evolution reactions using alkaline electrolytes. In this work, samples with different molar ratios of Ni to Fe are prepared by a typical hydrothermal method to study the effect of iron on the catalytic properties of NiFe-layered double hydroxide. All the NiFe-layered double hydroxides exhibit much better oxygen evolution reaction activity than NiOOH, while increasing the iron content slightly affects the activity, which implies that only Fe ions at some specific site contribute to the oxygen evolution reaction activity. The NiFe-layered double hydroxide with a 4:1 molar ratio of Ni to Fe shows the best oxygen evolution reaction catalytic performance, and requires only an overpotential of 176 mV to afford a current of 10 mA cm−2 in 1.0 M KOH, and exhibits a much lower Tafel slope (51 mV dec−1). This work also studies the effect of iron on the electronic structure of nickel and reveals the mechanism behind the excellent oxygen evolution reaction catalytic properties of NiFe-layered double hydroxide.

Ni2P(O)–Fe2P(O)/CeOx as high effective bifunctional catalyst for overall water splitting

The development of cost-effective bifunctional catalysts with excellent performance and good stability is of great significance for overall water splitting. In this work, NiFe layered double hydroxides (LDHs) nanosheets are prepared on nickel foam by hydrothermal method, and then Ni2P(O)–Fe2P(O)/CeOx nanosheets are in situ synthesized by electrodeposition and phosphating on NiFe LDHs. The obtained self-supporting Ni2P(O)–Fe2P(O)/CeOx exhibit excellent catalytic performances in alkaline solution due to more active sites and fast electron transport. When the current density is 10 mA cm−2, the overpotential of hydrogen evolution reaction and oxygen evolution reaction are 75 mV and 268 mV, respectively. In addition, driven by two Ni2P(O)–Fe2P(O)/CeOx electrodes, the alkaline battery can reach 1.45 V at 10 mA cm−2.

MoSe2 regulates Ce-doped NiFe layered double hydroxide for efficient oxygen evolution reaction: The increase of active sites

Oxygen evolution reaction (OER) is a common reaction in many sustainable energy conversion systems. However, it has become a bottleneck in the development of sustainable energy conversion systems because of its slow kinetics, especially in the common electrolytic water reaction. At present, although there are a lot of researches on OER's catalysts, it is still a great challenge. In this work, a new type of composite was prepared by simple co-precipitation method and Hydrothermal, which is composed of Ce-doped NiFe Layered Double Hydroxide (LDH) and MoSe2. The electrochemical test results of OER show that the overpotential of 6.7%Ce–NiFe LDH@MoSe2 is 221 mV at 10 mA/cm2, which is better than that of NiFe LDH (409 mV). And it is better than most of the reported OER catalysts in literature, including precious metal catalysts. Simultaneously, 6.7%Ce–NiFe LDH@MoSe2 also has smaller Tafel slope (35.8mV/dec), larger ESCA (6689 cm2), long-time stability and selectivity with 92.1% Faraday efficiency. The excellent OER performance of 6.7%Ce–NiFe LDH@MoSe2 benefits from the increase of active and defective sites and the interface coordination between MoSe2 and Ce–NiFe LDH.

Crystal Facet-Manipulated 2D Pt Nanodendrites to Achieve an Intimate Heterointerface for Hydrogen Evolution Reactions.

Despite the Pt-catalyzed alkaline hydrogen evolution reaction (HER) progressing via oxophilic metal-hydroxide surface hybridization, maximizing Pt reactivity alongside operational stability is still unsatisfactory due to the lack of well-designed and optimized interface structures. Producing atomically flat two-dimensional Pt nanodendrites (2D-PtNDs) through our 2D nanospace-confined synthesis strategy, this study tackles the insufficient interfacial contact effect during HER catalysis by realizing an area-maximized and firmly bound lateral heterointerface with NiFe-layered double hydroxide (LDH). The well-oriented {110} crystal surface exposure of Pt promotes electronic interplay that bestows strong LDH binding. The charge-relocated interfacial bond in 2D-PtND/LDH accelerates the hydrogen generation steps and achieves nearly the highest reported Pt mass activity enhancement (∼11.2 times greater than 20 wt % Pt/C) and significantly improved long-term operational stability. This work uncovers the importance of the shape and facet of Pt to create heterointerfaces that provide catalytic synergy for efficient hydrogen production.

Magnetic Field Enhanced Electrocatalytic Oxygen Evolution of NiFe-LDH/Co3 O4 p-n Heterojunction Supported on Nickel Foam.

Here, a strategy to regulate the electron density distribution by integrating NiFe layered double hydroxides (NiFe-LDH) nanosheets with Co3 O4 nanowires to construct the NiFe-LDH/Co3 O4 p-n heterojunction supported on nickel foam (NiFe-LDH/Co3 O4 /NF) for electrocatalytic oxygen evolution reaction (OER) is proposed. The p-n heterojunction can induce the charge redistribution in the heterogeneous interface to reach Fermi level alignment, thus modifying the adsorption free energy of *OOH and improving the intrinsic activity of the catalyst. As a result, NiFe-LDH/Co3 O4 /NF exhibits outstanding OER performance with a low overpotential of 274mV at a current density of 50mAcm-2 and long-time stability over 90h. Moreover, NF can serve as a magnetic core that induces the exchange bias effect between the magnetic substrate and the active species under the action of the magnetic field, resulting in decreased magnetoresistance and weakened scattering of spin electrons, which further lowers the OER overpotential by 25mV @ 50mAcm-2 under a 10000G magnetic field. This work provides a new perspective on the design of p-n heterojunction catalysts and a deeper understanding of the magnetic field-enhanced electrocatalytic reactions.

Computational atomic‐scale design and experimental verification for layered double hydroxide as an efficient alkaline oxygen evolution reaction catalyst

Electrochemical water splitting is one of the most efficient techniques to produce hydrogen in an environmentally friendly way. However, a sluggish anodic reaction, namely oxygen evolution reaction (OER), requires the use of an efficient electrocatalyst for achieving economic hydrogen production. Transition-metal-based layered double hydroxides (LDHs) are promising electrocatalysts for reducing the overpotential of OER in alkaline electrolyte, which is essential for efficient water electrolysis. Nickel-iron-based LDHs (Ni-Fe LDH) have been regarded as the best OER electrocatalysts under alkaline conditions. Hence, a number of research studies have been conducted on further improving the electrocatalytic performance of Ni-Fe LDH. Although the chemical blending of other transition metals with Ni-Fe-LDH is a simple and reliable strategy to enhance the OER activity of Ni-Fe-LDH, a systematic investigation on designing Ni-Fe-LDH with different additional elements is still lacking. In addition, the design of multi-metallic LDH compound via only experimental method is very costly and time-consuming process. In this study, atomic-scale computational and experimental studies are performed to design OER electrocatalysts including unary, binary, and ternary LDH compounds consisting of Ni, Fe, Al, and Co. Density functional theory calculations predict that Ni-Fe-Co ternary LDH can lead to the lowest overpotential for alkaline OER among various computationally modeled LDH systems. Further, experimental verifications successfully demonstrate the computational prediction wherein Ni-Fe-Co-LDH exhibits superior catalytic performance compared with Ni-Fe-LDH and benchmark IrO2 catalysts.

Hollow Co9S8@NiFe-LDH nanoarrays supported by nickel foam for boosting the overall water-splitting performance

Rational design of efficient, low-cost, and durable electrocatalyst for water-splitting is of great importance in the utilization of renewable energy. In this work, we report a facile heterostructure of nickel foam supporting hollow Co9S8 nanoarrays wrapped by NiFe-layered double-hydroxide (Co9S8@NiFe-LDH/NF) as the electrocatalyst for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) to improve the water-splitting efficiency. By the structural design, the strong electronic interaction among each component could offer more actives sites, higher charge transfer capability and better durability. As a result, excellent electrocatalytic activity for HER and OER are obtained. In 1 M KOH solution, the Co9S8@NiFe-LDH/NF exhibits low overpotentials of 287 mV for OER and 280 mV for HER to achieve catalytic current density of 50 mA cm−2. This work offers a new avenue to construct efficient and low-cost electrocatalyst for water-splitting.

Sulfur Engineering on NiFe Layered Double Hydroxide at Ambient Temperature for High Current Density Oxygen Evolution Reaction

Sulfur Engineering on NiFe Layered Double Hydroxide at Ambient Temperature for High Current Density Oxygen Evolution Reaction

Operando High‐Valence Cr‐Modified NiFe Hydroxides for Water Oxidation

High-valence metal-doped multimetal (oxy)hydroxides outperform noble metal electrocatalysts for the oxygen evolution reaction (OER) owing to the modified energetics between 3d metals and high-valence dopants. However, the rational design of sufficient and subtle modulators is still challenging. With a multimetal layered double hydroxide (LDH) as the OER catalyst, this study introduces a series of operando high-valence dopants (Cr, Ru, Ce, and V), which can restrict the 3+ valence states in the LDH template to prevent phase separation and operando transfer to the >3+valence states for sufficient electronic interaction during the OER process. Through density functional theory simulations, ultrathin Cr-doped NiFe (NiFeCr) LDH is synthesized with strong electronic interaction between Cr dopants and NiFe bimetallic sites, evidenced by X-ray absorption spectroscopy. The resulting NiFeCr-LDH catalyzes the OER with ultralow overpotentials of 189 and 284mV, obtaining current densities of 10 and 1000mA cm-2 , respectively. Further, a NiFeCr-LDH anode is coupled in the anion exchange membrane electrolyzers to promote alkaline water splitting and CO2 -to-CO electrolysis, which achieves low full cell voltages at high current densities.

Surfactant-Assisted Synthesis of Praseodymium Orthovanadate Nanofiber-Supported NiFe-Layered Double Hydroxide Bifunctional Catalyst: The Electrochemical Detection and Degradation of Diphenylamine.

Physiological storage disorders are caused by ineffective post-harvest handling of horticultural crops, particularly fruits. To address these post-harvest concerns, diphenylamine (DPAH•+) is widely used as a preservative to prevent fruit degradation and surface scald during storage around the world. Humans are negatively affected by the use of high concentrations of DPAH•+ because of the various health complications related to its exposure. As a result, accurate detection and quantification of DPAH•+ residues in treated fruits are critical. Rare earth metal orthovanadates, which have excellent physical and chemical properties, are potential materials for electrochemical sensors in this area. Herein, we present a simple and direct ultrasonication technique for the surfactant-assisted synthesis of praseodymium orthovanadate (PrVO4 or PrV) loaded on nickel iron layered double hydroxide (NiFe-LDH) synthesized with deep eutectic solvent assistance, as well as its application as an effective catalyst in the detection and degradation of DPAH•+ in fruits and water samples. The current work presents supreme electrochemical features of a PrV@NiFe-LDH-modified screen-printed carbon electrode (SPCE) where cetyltrimethylammonium bromide (CTAB) surfactant-driven fabrication of PrV directs the formation of highly qualified engineered structures and the deep eutectic solvent based green synthesis of NiFe-LDH creates hierarchical lamellar structures following the principles of green chemistry. PrV and NiFe-LDH combine to produce a synergistic effect that improves the number of active sites, charge transfer kinetics, and electronic conductivity. Differential pulse voltammetry analysis of PrV@NiFe-LDH/SPCE reveals a dynamic working range (0.005-226.26 μM), increased sensitivity (133.13 μA μM-1 cm-2), enhanced photocatalytic activity, and low detection limit (0.001 μM), which are considered significant when compared with the former reported electrodes in the literature for the determination of DPAḢ+ for its real-time applications.

Constructing NiFe-metal-organic frameworks from NiFe-layered double hydroxide as a highly efficient cocatalyst for BiVO4 photoanode PEC water splitting

• The NiFe-MOFs/BiVO 4 photoanode prepared by NiFe-LDH in-situ etching. • The prepared NiFe-MOFs/BiVO 4 photoanode has better PEC performance than BiVO 4 photoanode. • NiFe-MOFs/BiVO 4 improves the charge injection and separation efficiency of BiVO 4 . In this work, NiFe-metal-organic frameworks (NiFe-MOFs) cocatalyst was prepared from NiFe-layered double hydroxide (NiFe-LDH) through ligand assistance and constructed with BiVO 4 as a novel composite photoanode. The photocurrent density of BiVO 4 modified by NiFe-MOFs is increased by about 300%, and its stability is also remarkable improved. In addition, the incident photon-current conversion efficiency (IPCE) value of NiFe-MOFs/BiVO 4 photoelectrode increases to 58% at 410 nm, and both the injection and separation efficiency have also been enhanced. The ameliorated OER performance can be put down to the NiFe-MOFs which significantly lifts the kinetics of water oxidation. These findings provide new ideas for the production of bimetal MOFs for efficiently promoting the performance of photoanode PEC.

Spatially confined growth of ultrathin NiFe layered double hydroxide nanosheets within carbon nanofibers network for highly efficient water oxidation

The rational design of catalysts with low cost, high efficient and robust stability toward oxygen evolution reaction (OER) is greatly desired but remains a formidable challenge. In this work, a one-pot, spatially confined strategy was reported to fabricate ultrathin NiFe layered double hydroxide (NiFe-LDH) nanosheets interconnected by ultrafine, strong carbon nanofibers (CNFs) network. The as-fabricated NiFe-LDH/CNFs catalyst exhibits enhanced OER catalytic activity in terms of low overpotential of 230 mV to obtain an OER current density of 10 mA cm−2 and very small Tafel slope of 34 mV dec−1, outperforming pure NiFe-LDH nanosheets assembly, commercial RuO2, and most non-noble metal catalysts ever reported. It also delivers an excellent structural and electrocatalytic stability upon the long-term OER operation at a large current of 30 mA cm−2 for 40 h. Furthermore, the cell assembled by using NiFe-LDH/CNFs and commercial Pt/C as anode (+) and cathode (−) ((+)NiFe-LDH/CNFs||Pt/C(−)) only requires a potential of 1.50 V to deliver the water splitting current of 10 mA cm−2, 130 mV lower than that of (+)RuO2||Pt/C(−) couple, demonstrating great potential for applications in cost-efficient water splitting devices.

Facile Synthesis of N and P Co-Doped NiMoO4 Hollow Nanowires and Electrochemical Deposition of NiFe-Layered Double Hydroxide for Boosting Overall Seawater Splitting

NiMoO4 (NM) nanowires coated on nickel foam (NF) were prepared by the facile hydrothermal method. After calcination at low temperature, the nitrogen and phosphorus were co-doped into bimetal NF@NM nanowires. The hollow nanowire structure could be obtained after low-temperature calcination and nonmetallic doping. The as-synthesized hollow NF@NiMoO4/N/P (NF@NM-NP) nanowires exhibit excellent hydrogen evolution reaction performance (with an overpotential of −164 mV at −100 mA cm−2) due to the existence of planar defects and the hollow structure. To further improve the catalytic activity in the oxygen evolution reaction, amorphous lamellar NiFe-layered double hydroxide (NiFe LDH) was deposited onto the NF@NM-NP nanowires via an electrochemical method to form core–shell NF@NM-NP@NiFe LDH, which deliver an overpotential of 218 mV at 100 mA cm−2. Furthermore, an asymmetric setup composed of NF@NM-NP hollow nanowires and core–shell NF@NM-NP@NiFe LDH electrode were fabricated for overall seawater splitting, which can deliver potentials of 1.46 and 1.70 V at current densities of 10 and 100 mA cm−2 in simulated alkaline seawater (1 M KOH and 0.5 M NaCl), respectively. This may provide an effective path for the formation of a green energy conversion system.