NiCl2 Solution Research Articles

Heat and mass transfer performance of multi-solute electroplating wastewater in spray evaporation separation process

Electroplating wastewater is complex in composition and contains many harmful substances. Based on the single droplet heat and mass transfer method, a one-dimensional mathematical model for the evaporation separation heat and mass transfer process of multi-solute electroplating wastewater is established. In order to validate the model, the experimental system of evaporation separation tower is established, and Nusselt numbers corresponding to metal ion solutions are fitted, reliabilities of models are also verified. The maximum relative errors of mathematical models are within 10.0 %. In addition, effects of the type and concentration of metal ions and air inlet temperature on heat and mass transfer characteristics of spray separation tower are investigated. Experimental results show that when the wastewater inlet concentration is the same, the improvement effects of increasing air inlet temperature on evaporation and separation performance from high to low are ZnCl2, CuCl2, and NiCl2 solutions. When the air inlet temperature increases from 90 °C to 130 °C, the evaporation speed of ZnCl2, CuCl2 and NiCl2 solutions increase by 90.3 %, 84.3 % and 45.7 %, respectively. When the air inlet temperature is the same, with the increase of wastewater inlet concentration, the evaporation separation performance of electroplating wastewater in descending order is ZnCl2, CuCl2, and NiCl2 solutions.

Simply prepared α-Ni(OH)2-based electrode for efficient electrocatalysis of EOR and OER

As one of the most efficient Ni phases towards ethanol oxidation reaction (EOR), α-Ni(OH)2 is aimed to be simply prepared. Various α-Ni(OH)2-rich deposits are obtained chronoamperometrically from NiCl2 solution onto a pristine graphite surface at different potentials. After careful optimization, the optimum values deposition potential and time are found to be -0.9 V and 150 s, respectively. At longer deposition times, the predominant component of the deposits is the β-Ni(OH)2 phase. The optimum electrode, Ni(OH)2/G(opt), exhibits remarkable EOR catalytic activity with an ethanol oxidation peak current of 325.35 mA/cm2. Moreover, Ni(OH)2/G(opt) demonstrates noteworthy activity and durability for oxygen evolution reaction (OER) in 1 M NaOH. Whereas the overpotential at current density of 10 mA/cm2 (ηt=0) is 0.37 V; however, after 24 h it slightly increases to (ηt=24h) 0.39 V. These values imply significant outcomes for our novel and straightforward preparation method for creating highly efficient electrocatalysts for both EOR and OER using time- and cost-effective materials.

Low-cost visible spectrophotometer for detecting absorption and emission in metallic blends of colorful samples solution

The innovative, affordable assembled visible spectrophotometer employed in this study aims to analyze the absorption and emission of colorful metallic blends of colorful samples solution. It features a tungsten white light bulb source, an ammeter as a detection element, a digital voltmeter, a diffraction grating for light dispersion, a converging lens for light collimation, and filters of various wavelengths (blue, red, yellow, and yellow-green). The light bulb source was powered by a standard supply set at 6 V. Using metallic solutions of chromium chloride (CrCl3) and copper sulphate (CuSO4) with different filter wavelengths, the performance was assessed. The transmittance and absorbance of these metallic solution samples exhibit a linear relationship with approximately 3 % deviation compared to results from a commercial UV–VIS spectrophotometer (DR-6000). Similar investigations were conducted with equivalent quantities of CuSO4, CrCl3, and nickel chloride (NiCl2) solutions, showing a discrepancy ranging from 2 % to 8 % when compared with the commercial UV–VIS spectrophotometer. Therefore, in low-income countries like Ethiopia, colorful metallic solution samples can be effectively analyzed using the newly designed low-cost spectrophotometer.

Elastoplastic properties of ion exchangers based on cross-linked polyelectrolytes

In this paper, we dilatometrically studied the elastoplastic properties of spherical grains of industrial weakly acidic and strongly acidic ion-exchanger in experiments with constant uniaxial compression and a subsequent unload at room temperature, depending on the ionic form and concentration of the electrolyte solution. It was found that the ionic form of polyacrylate and polymethacrylate cross-linked with triethylene glycol dimethacrylate and divinylbenzene, respectively, and the concentration of the external solution affects their elastoplastic properties. In dilute solutions of sodium chloride and calcium chloride, the gels exhibited elastic properties with close relative amplitudes of deformation. The amplitude of deformation of the grain of polymethacrylate crosslinked with divinylbenzene, in the Ni form, in a dilute nickel chloride solution was significantly lower than that of the Ca form, with significant plastic deformation. With an increasing concentration of the external solution of calcium and nickel chlorides under mechanical load on the grain of polymethacrylate cross-linked with divinylbenzene, the total deformation of the granule and the magnitude of elastic deformation decreased, while the residual (plastic) deformations increased. In concentrated solutions of CaCl2 and NiCl2, such an ion-exchanger became an inelastic rigid material. Even under increased mechanical load, the magnitude of its elastic compressive deformation was very small. The K-form of a swollen in water strongly acidic polystyrene cation-exchanger with grafted sulpho groups cross-linked with divinylbenzene is also characterized by elastic deformations, i.e. the polymer is in a highly elastic state. However, the polystyrene matrix is more rigid compared to polyacrylic and polymethacrylic cation-exchangers in the alkali metal ion form, so the amplitude of deformation is significantly smaller. For such a cation-exchanger in Ca- and Ni- forms, elastic deformations prevail even in concentrated solutions.

Nickelophilic root foraging by the nickel hyperaccumulator, Streptanthus polygaloides subsp. undulatus (Brassicaceae)

AbstractRoot foraging may allow hyperaccumulator plants to enhance element accumulation. This study compared root proliferation of two annual serpentine endemics: Streptanthus polygaloides (Ni hyperaccumulator) and Streptanthus insignis (nonhyperaccumulator). In a greenhouse experiment, pots were divided by a sealed partition, Ni‐amended soil (800 mg kg −1) in one half, unamended soil in the other. Seeds were germinated over the partition, allowing roots to explore both soils. After 5 months, roots from each side of each pot were harvested, washed, dried, and weighed. Streptanthus polygaloides root biomass was significantly (twofold) greater in Ni‐amended soil whereas S. insignis root biomass was similar in the two soils. In a lab experiment, seedlings were grown in vertical agar‐filled petri dishes to determine if Ni affected seedling root growth. Seedlings were placed on either side of a central filter paper strip soaked in either NiCl2 solution or deionized water. Growth direction of the primary root (toward, away, neutral) and lateral root numbers and lengths were recorded. For seedlings, primary root direction and lateral root numbers/lengths were significantly increased toward Ni‐soaked filter paper only for S. polygaloides. We conclude that S. polygaloides exhibited positive root foraging responses. These may enhance Ni uptake and we suggest the term “nickelophilic root foraging” be applied to this behavior.

Construction of high-entropy oxy/hydroxides with dense nanosheet array structures on FeCoNiCrMo electrode for efficient oxygen evolution reaction

The high-entropy alloy (HEA) films prepared by magnetron sputtering on 3D substrates have excellent ability to release bubbles, good electrical conductivity, and abundant active sites, which lead to excellent performance in oxygen evolution reaction. HEA films with various elements were prepared on different substrates. In general, oxygen evolution reaction abilities of HEA film electrodes are related to morphologies of catalyst and types of active sites. Notably, nanostructures with regular array could help to increase the surface area of electrocatalysts and expose active sites. Also, chloride salt solution of transition metals can promote the formation of high-entropy oxy/hydroxides due to oxygen absorption oxidation reaction and displacement reaction on the surface of HEA film electrodes. And electrochemical oxidation at suitable high potential can also produce high-entropy oxy/hydroxides. In this work, dense nanosheet array structures of high-entropy oxy/hydroxides were constructed on the surface of FeCoNiCrMo HEA film electrodes preprocessed in NiCl2 solution and reconstructed by electrochemical oxidation in KOH solution further. The FeCoNiCrMo HEA film electrode with dense nanosheet array structures has excellent OER performance with the overpotential of 250 mV, Tafel slope of 41.5 mV dec−1, and electric double layer capacitance of 4.3 mF cm−2.

Relaxation measurements of an MRI system phantom at low magnetic field strengths

ObjectiveTemperature controlled T1 and T2 relaxation times are measured on NiCl2 and MnCl2 solutions from the ISMRM/NIST system phantom at low magnetic field strengths of 6.5 mT, 64 mT and 550 mT.Materials and methodsThe T1 and T2 were measured of five samples with increasing concentrations of NiCl2 and five samples with increasing concentrations of MnCl2. All samples were scanned at 6.5 mT, 64 mT and 550 mT, at sample temperatures ranging from 10 °C to 37 °C.ResultsThe NiCl2 solutions showed little change in T1 and T2 with magnetic field strength, and both relaxation times decreased with increasing temperature. The MnCl2 solutions showed an increase in T1 and a decrease in T2 with increasing magnetic field strength, and both T1 and T2 increased with increasing temperature.DiscussionThe low field relaxation rates of the NiCl2 and MnCl2 arrays in the ISMRM/NIST system phantom are investigated and compared to results from clinical field strengths of 1.5 T and 3.0 T. The measurements can be used as a benchmark for MRI system functionality and stability, especially when MRI systems are taken out of the radiology suite or laboratory and into less traditional environments.

Direct determination of intramolecular structure of D2O in the first hydration shell of Ni2+

Time-of-flight (TOF) neutron diffraction measurements have been carried out for aqueous 6 mol% NiCl2 solution in D2O in order to obtain experimental information on intramolecular structure of D2O molecules involved in the first hydration shell of Ni2+. The O-D bond length, rg OD = 0.982 ± 0.002 Å has been determined through the least squares fitting analysis of the observed difference interference term between the NiCl2 solution and pure D2O in the high-Q region (14 ≤ Q ≤ 40 Å−1). The present O-D bond length is significantly longer than that determined for pure liquid D2O (rg OD = 0.978 ± 0.001 Å), confirming strong hydrogen bonds between D2O molecules in the first- and the second hydration shell of Ni2+. These results are in good agreement with the νOD-rOD relationship obtained from infrared spectra for uncoupled O-D stretching frequency of HDO and O-D bond length of D2O molecule in aqueous solutions determined by neutron diffraction.

Construction of layered double hydroxides on wood surfaces for wood coloring

Wood dyeing usually requires a large concentration of metal solution, which when released to the atmosphere as waste liquid, causes pollution. In this study, a metal-organic framework (MOF) with micron-size structure was in-situ grown on a wood surface as a template and precursor for a layered double hydroxide (LDH). The LDH had a nanoscale structure and was generated on the wood surface from ultra-low concentration NiCl2 solution. The generation was based on a hydrolytically induced exchange process between the MOF and hydroxide ions. The results of following this procedure showed that petal-like Co/Ni-LDH with micro-nano composite structure was formed on the wood surface. Due to the LDH, a uniform light green color was formed on the wood surface at a reaction temperature and time of 60 ℃ in 34 min, respectively. To improve the hydrophobicity of the LDH layer, a long chain alkyl with low surface energy was introduced into the lamellae from a sodium stearate solution, constructing a superhydrophobic layer on the wood surface. The modified wood surface showed excellent UV light aging and water resistances. Moreover, Ni2+ was replaced with Mn2+, Fe3+, Cu2+, and Zn2+ ions and dark brown, yellow, blue, and white colors, respectively, were formed on wood. The present method is also suitable for other wood. Wood surface color adjusted by LDH uses low concentration of metal salt solution and proved to be a mild and green wood color toning method.

A simulation of methane hydrate formation in nickel chloride solution

Heavy metal is a potential threat to human, and hydrate-based method was one potential method proposed for heavy metal removal. In order to get a better understanding of the mechanism for heavy metal removal by hydrate-based method, simulation of methane (CH4) hydrate formation in nickel chloride (NiCl2) solution was conducted from molecular level by using Gromacs-2020.3 software. From the simulation results, CH4 hydrate formed in NiCl2 solution can be judged from the increasing of four-body structural order parameters (F4) and the decreasing of total energy. Hydrate or interfacial hydrate rather than ice was the main solid structure via CHILL + Algorithm analysis. All nickel chloride was repelled out of CH4 hydrate during 2000 ns of simulation, which corresponded with the salt-removing effect. The simulation results also indicated that chloride ion accelerated the nucleation of CH4 hydrate no matter the cation was Na+ or Ni2+. Finally, CH4 hydrate with both Structure I (sI) and Structure II (sII) were formed in NiCl2 solution in 2000 ns of simulation, and sI type hydrate was the main CH4 hydrate structure in NiCl2 solution.

Double surface modification of graphite felt using a single facile step for electrolytic hydrogen production assisted by urea

Graphite felt (GF) is modified electrochemically using a facile controllable method via scanning the potential from +2 to ‒1.5 V in solutions containing various NiCl2 concentrations. By increasing the NiCl2 amount, the anodic oxidation and cathodic deposition processes are enhanced, and the GF surface is simultaneously functionalized. Firstly, at a high positive potential, GF’ functionalization occurs by making a defect in the carbon framework. Then, at a high negative potential, the rate of hydrogen evolution increases and produces a strong homogeneously uniform Ni(OH)2 coating at the GF surface. Modified GF is examined by SEM, mapping EDX, HR-TEM, XPS, XRD, Raman, and contact angle measurements. Interestingly, the Ni(OH)2 film deposited at GF from 100 mM NiCl2 solution (Ni(OH)2/GF-100) enhances the hydrogen evolution reaction in alkaline medium by deriving a current density of 10 mA cm−2 at a low overpotential of 69 mV which approaches the value of the benchmark catalyst. Additionally, the Ni(OH)2/GF-100 electrode supports urea oxidation as it drives a current density of 10 mA cm−2 at a potential of 1.38 V vs RHE. Therefore, Ni(OH)2/GF-100 is used as a bifunctional catalyst to replace the unfavourable anodic reaction (oxygen evolution reaction) with urea oxidation. Furthermore, a two electrode cell for urea electrolysis displays a cell voltage of 1.47 V, which is lower than that of water splitting by about 270 mV, to drive a current density of 10 mA cm−2 and shows superb stability over a prolonged electrolysis time of 24 h. So, this approach introduces an energy-saving route.

Decreased thioredoxin reductase 3 expression promotes nickel-induced damage to cardiac tissue via activating oxidative stress-induced apoptosis and inflammation.

Thioredoxin reductase 3 (Txnrd3) plays a crucial role in antioxidant and anti-cancer activities, and sperm maturation. The damage of heavy metals, including Nickel (Ni), is the most prominent harm in social development, and hampering Txnrd3 might exacerbate Ni-induced cardiac damage. In this study, a total of 160 8-week-old C57BL/N male mice with 25-30 g weight of Txnrd3+/+ wild-type and Txnrd3-/- homozygote-type were randomly divided into eight groups. The mice in the control and Ni groups were gavaged with distilled water and a freshly prepared 10mg/kg NiCl2 solution. Melatonin (Mel) groups were administered at a concentration of 2mg/kg for 21 days at the mice's 0.1ml/10g body weight. Ni exposure up-regulated the messenger RNA (mRNA) levels of mitochondrial apoptosis (caspase-3, caspase-9, cytochrome c, p53, and BAX), autophagy (LC3, ATG 1, ATG 7, and Beclin-1), and inflammation (TNF-α, COX 2, IL-1β, IL-2, IL-6, and IL-7)-related markers, but down-regulated the mRNA levels of BCL-2, p62 and mTOR (p < .05). Ni exposure decreased the expression of BCL-2 and p62 protein but increased the expression levels of caspase-3, caspase-9, cytochrome c, p53, BAX, ATG 7, Beclin-1, TNF-α, COX 2, IL-1β and IL-2 protein (p < .05). Ni increased the contents of glutathione disulfide (GSSG) and malondialdehyde (MDA) and decreased the activities of catalase (CAT) and total superoxide dismutase (T-SOD) (p < .05). Decreased Txnrd3 expression significantly exacerbated changes compared to the Ni exposure (p < .05). Mel significantly attenuated these changes, but the effect decreased when Txnrd3 was inhibited (p < .05). In conclusion, decreased Txnrd3 expression promoted Ni-induced mitochondrial apoptosis and inflammation via oxidative stress and aggravated heart damage in mice. Decreased Txnrd3 expression significantly reduced the protective effect of Mel to Ni exposure.

Fluffy-Like Cation-Exchanged Prussian Blue Analogues for Sodium-Ion Battery Cathodes.

Prussian blue (PB) and its analogues are considered as promising cathode materials for sodium-ion batteries (SIBs) owing to their low cost and high capacity. However, it is still a huge challenge to avoid obvious capacity decay during cycling due to the structural collapse. Herein, we design a method to replace parts of Fe ion sites in PB with Ni ions to prepare fluffy-like nickel PB (PB-Ni) by cationic solution immersion, which improves cycling stability for sodium storage. The content of Ni in PB-Ni is explored by regulating the soaking time in the Ni-containing solution, which results in different effects on the electrochemical performance as cathodes of SIBs. Especially, PB-Ni-1d (soaking in NiCl2 solution for 1 day) exhibits an initial capacity of 114.2 mA h g-1 at 50 mA g-1 and a stable cycling performance of 800 cycles at 300 mA g-1. Furthermore, the reversible phase transformation and small volume variation for PB-Ni-1d are revealed by in situ X-ray diffraction characterization. The nickel hexacyanoferrate in outer layer maintains the cubic phase to stabilize the crystal structure. The cation-exchange strategy provides a facile idea to fabricate high-quality PB cathodes with superior stability for high-performance SIBs.

Geotechnical properties of yellow silty sand soil modified by bio-stimulation with presence of NiCl2

Microbiologically induced calcite precipitation (MICP) is now widely tried to improve the quality of mostly sandy soil due to its application prospect to sustainability, environment-friendly and cost-efficiency. The present study is aiming to evaluate the feasibility of bio-stimulation, one of MICP techniques, for strengthening the engineering quality of Shanghai silty sand soil, a special type of soil located in low hillside of west Shanghai, as well as the influence of two factors: CaCl2 as a cementing material and NiCl2 as a co-factor, which was rarely researched before and can be viewed as the influence of urease activity on bio-stimulation result. The direct shear test, unconfined compressive test, supersonic wave test and calcite mass test have been carried out to evaluate engineering performance of yellow silty sand soil enhanced by bio-stimulation method as well as their relationship with concentration of CaCl2 and NiCl2 solutions. The result shows that bio-stimulation method can significantly promote the characteristics of Shanghai yellow silty sand soil and there seems to be extreme point for concentration of CaCl2 and NiCl2 solution in improving the quality of Shanghai yellow silty sand. Microstructure and composition of treated soil by bio-stimulation method have also been analyzed by Scanning Electron Microscope (SEM) and Energy dispersive Spectrometer (EDS), with giving the corresponding micro-mechanism of bio-cementation among soil particles.

Enhanced photoelectrochemical performance of NiO-doped TiO2 nanotubes prepared by an impregnation–calcination method

To improve the photocatalytic activity of TiO2, a series of NiO–TiO2 nanotubes (NTbs) is prepared by impregnating TiO2 nanotubes in a solution of NiCl2·6H2O at different concentrations. Self-organized TiO2 nanotubes are prepared by a two-step anodization process. Scanning electron microscopy images show that large particle agglomerates are formed for higher precursor concentrations, and X-ray energy-dispersive spectroscopy results indicate that the atomic percentages of Ni in the NiO–TiO2 NTbs prepared with precursor concentrations of 100 and 300 mM are 1.95% and 4.23%, respectively. Electronic lifetime measurements show that the recombination rate of photogenerated electron–hole pairs is lower for NiO–TiO2 NTbs compared to that of TiO2. Specifically, the recombination rate of the sample prepared at 50 mM is the lowest, which is associated with the longest electron lifetime. Compared to unmodified TiO2 nanotubes, NiO–TiO2 NTbs exhibit improved results for the photocatalytic degradation of rhodamine B.

Influence of the external electric field distribution on α-Ni(OH)2 electrochemical-synthesis from a NiCl2 solution

Electrolytic systems of a symmetric, an asymmetric and a two-compartment were established in the present work to investigate the effect of the external electric field distribution on α-Ni(OH) 2 electrochemical-synthesis from a NiCl 2 solution. Results demonstrate the sample particle size increased in the order of symmetric, two-compartment and asymmetric systems, with a sharpened diffraction peak of the (1 0 1), (0 1 5) and (1 1 0) plane, and a broadened diffraction peak of (0 0 3) plane. However, the reversibility of the redox reactions and the energy transferred in the redox reactions in the electrodes assembled by the samples from the three electrolytic systems increased based on the contrary order. In terms of the electrolysis process, the energy consumption per unit mass increased in the order of symmetric, two-compartment and asymmetric systems. The catholyte pH for both symmetric and asymmetric systems were more stable than that for the two-compartment system. The external electric filed distribution affected the transportation of Ni 2+ from the anolyte to the catholyte. At the end of electrolysis, the Ni 2+ concentration in the anolyte of two-compartment system was obviously higher than that of symmetric and asymmetric systems.

Ultrahigh Water Permeance of Reduced Graphene Oxide Membrane for Radioactive Liquid Waste Treatment.

Membrane methods exhibit great potential for application in radioactive liquid waste treatment. In this work, we prepared a reduced graphene oxide using the amino-hydrothermal method (AH-rGO) that exhibited effective rejection rates of 99.9% for CoCl2, ZnCl2, NiCl2, and radionuclide 60Co solutions with an ultrahigh water permeance of >71.9 L m−2 h−1 bar−1. The thickness of the AH-rGO membranes affects the water permeance, as the membrane with a thickness of ≈250 nm has the highest water permeance of up to 125.1 L m−2 h−1 bar−1 with the corresponding rejection rate of 86.8%. Importantly, this is the most permeable membrane with a satisfactory level of the rejection rate for typical radioactive ions of Co2+, Zn2+, and Ni2+. Moreover, the AH-rGO membranes presented excellent stability. These findings demonstrate the potential of reduced graphene oxide (rGO) membranes for radioactive liquid waste treatment.

Facile preparation of NiFe2O4/NaCl nanocomposites by wet chemical co-precipitation

In this work, we utilized various iron salts {Fe(NO3)3, FeSO4 and FeCl3} at the presence of aqueous solutions of NiCl2 and NaOH, respectively, to prepare NiFe2O4/NaCl nanocomposites using wet chemical co-precipitation. The dark-brown products were afterwards calcined for 3 h at 600 °C. All products were characterized using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and transmission electron microscopy (TEM). XRD results confirmed formation of the NiFe2O4/NaCl nanocomposites. The TEM results revealed that the particles are relatively similar in cube-like shape; however, the size was distinct.

Comparison of acidic leaching using a conventional and ultrasound-assisted method for preparation of magnetic-activated biochar

Four magnetic biochars (MBs) were prepared from two mixtures of Sappeli sawdust with NiCl2 solution or Sappeli sawdust with NiCl2 plus ZnCl2 solutions. These mixtures formed two pastes that were dried and further pyrolyzed at 700 °C under nitrogen flow. The pyrolyzed material was leached out with 0.1 M HCl under conventional reflux (AL- 80 °C, 2 h) or assisted by ultrasound-leaching (US- 15 min, 600 W), obtaining four biochars: SNiAL, SNiUS, SNiZnAL, SNiZnUS. The biochars were characterized by VSM, XRD, FTIR, isotherms of adsorption and desorption of nitrogen, pHpzc, hydrophobically characteristics (HI), TGA, elemental analysis (CHN/O). The data show that using the leaching process assisted by ultrasound can obtain biochars that present good magnetization saturation, with a lower leaching time than conventional leaching. The four biochar were tested as adsorbents to remove ten emerging contaminants and four dyes of aqueous effluents. It was observed that the impregnation of zinc chloride in the samples led to an increase in the surface areas of the magnetic biochars, which influenced the most of sorption capacities of the adsorbents for the different sorbing species. Making a ratio of sorption capacities of SNiAL/SNiZnAL and SNiUS/SNiZnUS, it was obtained the values, respectively, of 0.9761, and 0.9710 (Acid Red 1), 2.057, and 3.030 (Reactive Blue 4), 4.192, and 1.971 (Basic Violet 3), 3.359, and 1.129 (Basic Green 1), 1.673, and 1.835 (Paracetamol), 3.612, and 3.779 (Propranolol), 5.871, and 5.171 (Sodium Diclofenac), 1.457, and 1.607 (Nicotinamide), 1.094 and 1.093 (Caffeine), 1.167, and 2.398 (4-chloroaniline), 1.009 and 0.9965 (2-nitrophenol), 1.156 and 1.341 (Resorcinol), 1.299 and 1.331 (Hydroquinone), 0.9975 and 1.019 (4-bromophenol).

Ni-Al layered double hydroxides electrodeposition from a chloride solution

Abstract Ni-Al LDHs was electrodeposited from a NiCl2-AlCl3 solution. In order to analyze the electrodeposition process, electrolytes with initial Al content range of 0–20% were used. With increasing Al content in the sample, the preferred orientations of (0 0 3) and (0 0 6), increased crystallinity, and decreased interlayer spacing were observed from the XRD results. A dissolution–recrystallization of (0 0 3) plane was detected among the Ni-Al LDHs from the strongly alkaline solution soaking results, which was found to be conducted easily in high Al-containing samples. The pH of the Al-containing electrolyte was much lower than that of pure NiCl2 solution because lower pH was needed to start a precipitation reaction in the AlCl3-NiCl2 solution. The electrodeposition yield and current efficiency were found to decrease obviously in the electrolytes with initial Al content higher than 10%, which was attributed to the increasing Al content in the sample and diffusion of the complex ions. The electrodeposition pattern was in-situ in the electrolyte initially containing 10% Al, then, it developed toward and off in-situ in electrolytes initially containing 0–10% and 10–20% Al.