NaOH Electrolyte Research Articles

The Effect of NaOH and LaCoO3 Perovskite on HHO Gas Production Rate

Utilization of renewable energy such as solar energy, wind energy, require a technology to store energy since production and consumption energy isn’t always at the same time. Hydrogen appears as an alternative solution to store energy since it has high energy density and can be easily obtained from water by electrolysis reaction. Electrolysis produces hydrogen and oxygen gas and when it combines forming HHO gas. There are many factors that can influence HHO gas production, such as electrolyte concentration and utilization of catalyst. In this research, we observed the effect of NaOH electrolyte concentration and catalyst LaCoO3 concentration toward production of HHO gas. Catalyst LaCoO3 is synthesized by sol-gel method with calcination over 900°C, however particle of LaCoO3 that formed still submicron-sized. To obtain catalyst LaCoO3 that disperse in electrolyte suspension, it is treated by beads milling process to minimize the size of particle. Experiment result showed that increasing NaOH electrolyte concentration will affect to increment of HHO gas production. The most optimal HHO gas production from all variation of catalyst LaCoO3 is when using 3 M of NaOH electrolyte concentration. However, addition of catalyst LaCoO3 in suspension electrolyte will drop HHO gas production.

Bio-waste derived self-templated, nitrogen self-doped porous carbon for supercapacitors

The preparation of low-cost and scalable, porous activated carbon received great interest because of the huge need for electrode materials for supercapacitor applications. In this work, the porous activated carbon is prepared from shrimp shell waste by a two-step process; i.e. carbonization and KOH activation process. Moreover, the presence of inherent CaCO3 acted as a self-template to make the additional porous structure. The prepared activated carbon has been verified through various physical and chemical characterizations. The results confirm the prepared activated carbon flakes possess numerous macro and mesopores with inherently nitrogen-doped. The electrochemical performance of the prepared activated carbon has been tested in various electrolytes such as KOH, NaOH, and Na2SO4. The activated carbon electrode shows a higher specific capacitance of 225 F/g at 1 A/g in NaOH electrolyte. Finally, the symmetric supercapacitor device is fabricated using prepared activated carbon and tested its electrochemical performances. The symmetric supercapacitor device delivered a cell capacitance of 81.7 F/g with energy and power densities of 11.23 Wh/kg and 248.8 W/kg, respectively with good rate capability (80.5 %) and capacitance retention (80 %) at higher current density.

Excellent performance of dodecyl dimethyl betaine and calcium gluconate as hybrid corrosion inhibitors for Al alloy in alkaline solution

Dodecyl dimethyl betaine (BS-12) and calcium gluconate (CaGlu) are examined as hybrid corrosion inhibitors for AA5052 aluminum alloy in 4 M NaOH electrolyte. The corrosion inhibition is investigated by hydrogen evolution tests, electrochemical measurements, surface analysis, and theoretical calculation. It demonstrates that the hybrid inhibitors can protect aluminum alloy effectively. CaGlu has a good coordination effect with aluminum ions. The hydrophilic group of BS-12 can occupy the active sites on the aluminum alloy/solution interface. The hydrophobic alkyl chain can further enhance the corrosion inhibition effect. The maximum corrosion inhibition efficiency reaches 86.3% at 1 mM BS-12 + 3 mM CaGlu.

Enhanced performance of Al-0.02Mg-0.01Sn-0.004Bi-0.003In alloy as novel anode for Al-air batteries in alkaline electrolyte

In this paper, aluminum alloy doped with Mg, In, Sn and Bi (Al-0.02Mg-0.01Sn-0.004Bi-0.003In) is prepared via melting and casting process. The influence of rare earth elements Bi and In on electrochemical performance of aluminum alloy anode is studied. The self-corrosion of hydrogen evolution and the electrochemical performance are investigated for the prepared alloy in 4 M NaOH electrolyte. The scanning electron microscope is used to study the surface morphology of the prepared alloy after discharge. It shows that synergistic effect between the alloy elements significantly reduces the self-corrosion rate of aluminum anode. Discharge experiments display that the prepared alloy outputs high capacity density and energy density of 2857.14 A h kg−1 and 4805.71 W h kg−1 at a high discharge rate (50 mA cm−2), respectively. It can also obtained considerable anodic utilization of 95.94 %. The prepared aluminum alloy is a desirable candidate anode material for the high-performance Al-air battery.

Effects of Sn and Nb Doping on the Performance of Fe2TiO5 As a Water Splitting Photocatalyst

Very recently, pseudobrookite Fe2TiO5 has been revealed as a promising photocatalyst for the oxidation half-reaction of overall water splitting. This semiconductor is inexpensive, non-toxic, possesses a relatively small band gap, and presents improved structural and photochemical features compared to other well-known photocatalysts. In this investigation, we doped the Fe2TiO5 structure with 1.0 at% tin and 1.5 at% niobium, separately, through a solvothermal method to prolong the minority carrier diffusion length and reduce charge recombination events under visible light illumination. The procedure generated single-phase Sn- and Nb-doped Fe2TiO5 nanoparticles with dimensions close to 30 nm. In both cases, optical band gap values of 2.1 eV were observed. Pristine Fe2TiO5, Sn-doped Fe2TiO5, and Nb-doped Fe2TiO5 were irradiated by a Xe lamp (λ>400 nm), producing 59.2, 297.6 and 344.0 mmol h-1 g-1 of O2, respectively. This result reflects the substantial improvement that doping Fe2TiO5 with Sn and Nb confers to its photocatalytic water splitting activity. In addition, photoelectrochemical measurements in a 1 M NaOH electrolyte indicated photocurrent increments from 2.4 mA cm-2 at 1.23 VRHE, for the pristine Fe2TiO5, to 36.7 and 70.7 mA cm-2 at 1.23 VRHE for Sn- and Nb-doped Fe2TiO5, respectively, accompanied by overpotential drops of 0.04 and 0.1V. Electrochemical impedance spectroscopy indicated that reductions in the resistance for the charge carrier transfer resistance at the solid/liquid interface plays an important role for the performance improvement of the doped nanomaterials. Overall, this work illustrates how structural alterations of a potential photocatalyst can improve photochemical energy conversion. The authors acknowledge support from FAPESP (Grant 2017/11986-5) and Shell and the strategic importance of the support given by ANP (Brazil’s National Oil, Natural Gas and Biofuels Agency) through the R&D levy regulation.

Investigation of the stability of the boron-doped diamond support for Co3O4-based oxygen evolution reaction catalysts synthesized through in situ autocombustion method

• The In Situ Autocombustion allows easy preparation of oxide–carbon composites for OER. • Co 3 O 4 nanoparticles in composites are smaller and less agglomerate than bulk one. • The Co 3 O 4 -BDD composite is a competitive electrocatalyst for the alkaline OER. • Higher stability of the BDD compared either to Vulcan or Sibunit conventional carbons. • BDD is a promising support for alkaline or anion exchange membrane electrolysis cells. In this work we studied the anodic stability of nanostructured Boron-Doped Diamond (BDD) in view of its eventual utilisation as support for metal oxide–carbon composites prepared by the In Situ Autocombustion (ISAC) method. The anodic behaviour of the BDD was investigated by the rotating ring-disc electrode (RRDE) method in 1 M NaOH electrolyte to determine its corrosion current and compare the latter with that of the commercial Vulcan XC-72 carbon from Cabot and Sibunit pyrolytic carbon, the latter known for its high stability against electrochemical corrosion. The BDD has proven to be significantly more stable than either the Sibunit or the Vulcan carbon. The Co 3 O 4 -BDD and Co 3 O 4 -Sibunit composites prepared by the ISAC method were then tested as catalysts of the oxygen evolution reaction (OER). The Co 3 O 4 -BDD composites appear to be competitive electrocatalysts for the OER in alkaline medium, showing activity comparable to the literature and much higher support stability towards oxidation. Further research is required to decrease the size of Co 3 O 4 spinel nanoparticles and improve their distribution over the BDD support and hence increase the mass-specific OER activity of the BDD-based ISAC composites.

Electrochemical Activation of Silicon: Enhancing Hydrogen Production from FeNi Electrocatalysts

A two-sided electrode composed of FexNi100–xOy and Si was implemented to produce hydrogen. The hydrogen evolution reaction is facilitated by the FexNi100–xOy electrocatalyst. The high pH of the alkaline electrolyte and the reducing potential of the electrode result in the activation of the Si side, allowing spontaneous production of H2. Results demonstrate that the FexNi100–xOy composition and the electrolyte composition influence the performance of the FexNi100–xOy/Si system. The activation and subsequent production of H2 by the Si was demonstrated to be favored in 0.1 M KOH and NaOH electrolytes over LiOH, and this result was consistent when the electrochemical cell was operated under applied voltage and at open circuit voltage. At the same time, results showed that the Fe80Ni20/Si composition maintained a current of −10 mA at a lower potential (∼50 mV) compared to the Fe20Ni80/Si composition. Overall, the results of this study demonstrate that the two-sided FexNi100–xOy/Si electrode can be used to boost the production of hydrogen, leading to a maximum of 140% H2 efficiency, which includes both Faradaic H2 production and non-Faradaic H2 evolution through Si corrosion.

Repurposing N-Doped Grape Marc for the Fabrication of Supercapacitors with Theoretical and Machine Learning Models.

Porous carbon derived from grape marc (GM) was synthesized via carbonization and chemical activation processes. Extrinsic nitrogen (N)-dopant in GM, activated by KOH, could render its potential use in supercapacitors effective. The effects of chemical activators such as potassium hydroxide (KOH) and zinc chloride (ZnCl2) were studied to compare their activating power toward the development of pore-forming mechanisms in a carbon electrode, making them beneficial for energy storage. GM carbon impregnated with KOH for activation (KAC), along with urea as the N-dopant (KACurea), exhibited better morphology, hierarchical pore structure, and larger surface area (1356 m2 g−1) than the GM carbon activated by ZnCl2 (ZnAC). Moreover, density functional theory (DFT) investigations showed that the presence of N-dopant on a graphite surface enhances the chemisorption of O adsorbates due to the enhanced charge-transfer mechanism. KACurea was tested in three aqueous electrolytes with different ions (LiOH, NaOH, and NaClO4), which delivered higher specific capacitance, with the NaOH electrolyte exhibiting 139 F g−1 at a 2 mA current rate. The NaOH with the alkaline cation Na+ offered the best capacitance among the electrolytes studied. A multilayer perceptron (MLP) model was employed to describe the effects of synthesis conditions and physicochemical and electrochemical parameters to predict the capacitance and power outputs. The proposed MLP showed higher accuracy, with an R2 of 0.98 for capacitance prediction.

Rhodium-decorated nanoconical nickel electrode synthesis and characterization as an electrochemical active cathodic material for hydrogen production

Noble metals in form of bulk materials are rarely used as catalysts in industrial applications due to their price and limited accessibility. However, the surface of commonly-used materials can be modified with an exceptionally low amount of platinoids to enhance their electrochemical activity.In this work, the surface of the free-standing nanoconical Ni structures was modified with a thin metallic rhodium layer with a spontaneous galvanic displacement process. It emerged that Rh-decorated Ni nanoconical electrodes exhibited higher catalytic activity in a model hydrogen evolution reaction in an alkaline environment in comparison to the unmodified electrode. Furthermore, the proposed synthesis protocol is high-speed and straightforward, making it promising in application on a semi and industrial scale. Linear Sweep Voltammetry measurements were used to test the catalytic activity in 1 M NaOH electrolyte. The nanoconical structures were highly-hydrophobic, what has been observed by dedicated camera-based equipment. In addition, the electrochemically-active surface area (ECSA) of tested electrodes were estimated and confirmed in atomic force microscope AFM measurements. The durability of coatings was tasted in 1 M NaOH for 14 days.

Integrated electrocatalytic packed-bed membrane reactor for nitrate removal

Nitrate pollution has become a widespread problem that poses a potential risk for public health. Although electrochemical reduction can be an effective and environmentally friendly strategy for nitrate removal, obtaining non-polluting products (nitrogen) in a short hydraulic retention time via this electrocatalytic process is still challenging. This work features an efficient reactor design that integrates an electrocatalytic packed-bed reactor with a membrane. Granular activated carbon (GAC) loaded with bimetal catalysts (Pd and Cu) was used as the bed packing material (Pd-Cu/GAC). The carbon membrane loaded Pd-Cu, served as cathode, filter, and current collector. The inner core packed with the Pd-Cu/GAC material functioned as an extended three-dimensional electrocatalytic cathode and catalyst. This carbon membrane system can remove 100% nitrate with the packed-bed catalyst in Na2SO4 electrolyte, but only 79.38% without the packed-bed catalyst. The packed-bed configuration can also enhance the nitrogen (N2) selectivity from 39.66 to 78.31%, increasing the NO3– removal rate from 1.72 × 10−4 to 3.62 × 10−4 mmol min−1 cm−2, respectively. Notably, when NaOH electrolyte was used, the single-pass nitrate removal can achieve 100% with a 94.25 % N2 selectivity. These excellent performances highlight the potential to apply the integrated electrocatalytic packed-bed membrane reactor system reported here for large-scale nitrate remediation.

Consequences of electrodeposition parameters on the microstructure and electrochemical behavior of electrolytic manganese dioxide (EMD) for supercapacitor

In this study, manganese dioxide (MnO2) was electrochemically synthesized on the surface of a lead anode using different current densities (100–300 A m−2) and deposition time (4–6 h). This work intends to highlight the consequences of various electrodeposition parameters via the electrochemical approach. The MnO2 electrowinning plant must consider the effect of electrodeposition parameters that can ensue on the overall impact of electrolytically derived MnO2 (EMD) powder on a larger scale. The micrographs of the obtained EMD powder revealed that spindle-like morphology was observed for the current density between 100 and 200 A m−2, whereas moss-like morphology was observed at a current density above 200 A m−2 with increased surface roughness. The deposition time has not shown a profound effect. This study highlights the EMD deposited at 200 A m−2 for 5 h when tested in 2 M NaOH electrolyte exhibits a storage performance of 98 F g−1. For broader adoption of this material, the asymmetric device comprising EMD versus activated carbon (EMD/AC) has been fabricated. The asymmetric supercapacitor is a key for storing energy, which delivered 36 F g−1 at energy and power densities of 10 Wh kg−1 and 2352 W kg−1, respectively. The further increase/decrease of current density and deposition time has a deleterious effect on the storage performance.

Detailed analysis on engine operating in dual fuel mode with different energy fractions of sustainable HHO gas

AbstractCarbon emission and problems associated with the world have been the major concerns for the past few decades. The world governments have implemented stringent emission norms to reduce the pollution created by hydrocarbon combustion in automobiles. The use of gaseous fuels in IC engines has gained interest among the research community. In the present research work, hydrogen, and oxygen (HHO gas) are produced together in an electrolyzer unit and is fed into the engine intake manifold before the carburetor. The electrolyzer consists of an anode, cathode and five neutral plates made of 316 L SS. Electrolyser production rate was tested with four different molarity conditions of NaOH electrolyte solution ranging from 0.24 to 1 N. It was noted that a maximum of 2 LPM of HHO gas was produced with the supply of 90 A‐h current at 1 N solution concentration. The performance and emission characters of the SI engine were conducted at six different load conditions and four flow rates of HHO gas. HHO gas induction has significantly increased the thermal brake efficiency by 8% and decreased the specific fuel consumption by 20%. With the supply of 2 LPM of HHO gas, CO2, HC, and NOx emissions were reduced by 67%, 59%, and 34%, respectively.

Corrosion Behavior of an Mg2Sn Alloy.

In the present work, the corrosion behavior of the Mg2Sn alloy (Mg66.7Sn33.3, concentration in at.%) has been studied. The alloy was prepared from high purity Sn and Mg lumps by induction melting in argon. The alloy was composed of intermetallic Mg2Sn with a small amount of Mg2Sn + (Sn) eutectic. The corrosion behavior was studied by hydrogen evolution, immersion, and potentiodynamic experiments. Three aqueous solutions of NaCl (3.5 wt.%), NaOH (0.1 wt.%) and HCl (0.1 wt.%) were chosen as corrosion media. The alloy was found to be cathodic with respect to metallic Mg and anodic with respect to Sn. The corrosion potentials of the Mg2Sn alloy were −1380, −1498 and −1361 mV vs. sat. Ag/AgCl in HCl, NaCl and NaOH solutions, respectively. The highest corrosion rate of the alloy, 92 mmpy, was found in aqueous HCl. The high corrosion rate was accompanied by massive hydrogen evolution on the alloy’s surface. The corrosion rate was found to decrease sharply with increasing pH of the electrolyte. In the NaOH electrolyte, a passivation of the alloy was observed. The corrosion of the alloy involved a simultaneous oxidation of Mg and Sn. The main corrosion products on the alloy surface were MgSn(OH)6 and Mg(OH)2. The corrosion mechanism is discussed and implications for practical applications of the alloy are provided.

One-step synthesis of the hydrophobic conical Co-Fe structures-the comparison of their active areas and electrocatalytic properties

Enhancement of the surface of the catalyst is desirable in the interest of mass transport maximizing. However, without a well-defined method of determination of its active surface, catalyst deposited with different conditions cannot be accurately compared. In this work, Co-Fe alloy cones were synthesized from the electrolyte containing ammonium chloride as a crystal modifier. It controls the direction of the deposit growth, and consequently, develops the active surface area. Moreover, the influence of the direction of the applied magnetic field on the ferromagnetic Co-Fe alloy was investigated. It affected noticeably the morphology and composition of layers and therefore, the catalytic activity of the samples in the Hydrogen Evolution Reaction (HER). Linear Sweep Voltammetry (LSV) measurements were used to test the catalytic activity in 1 M NaOH electrolyte. The expected development of the real active surface area was determined using two different methods: Brunauer-Emmett-Teller (BET) and Helmholtz Double-Layer Capacitance (DLC). Results show that no specific value of the sample surface multiplication can be found based on these methods. All conical structures were hydrophobic.

Electrochemical Performance of Al-1Zn-0.1In-0.1Sn-0.5Mg-xMn (x = 0, 0.1, 0.2, 0.3) Alloys Used as the Anode of an Al-Air Battery

In this work, Al-1Zn-0.1In-0.1Sn-0.5Mg-xMn (x = 0, 0.1, 0.2, 0.3) alloys are prepared and used as the anode of an Al-air battery (AAB). We use scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) and optical microscopy (OM) to analyze the microstructures of the alloys. The hydrogen evolution rate, electrochemical performance (including polarization curves), electrochemical impedance spectroscopy (EIS), and battery performance of the samples are examined in the 4 M NaOH electrolyte. The experimental data display that the average grain size is significantly refined after adding manganese into the Al-1Zn-0.1In-0.1Sn-0.5Mg alloy, with a decrease in grain size from over 100 μm to about 10 μm. The improved activity of the aluminum anode in the AAB can be attributed to the introduction of manganese. The Al-1Zn-0.1In-0.1Sn-0.5Mg-0.1Mn alloy possesses the optimal overall performance with a lower self-corrosion rate (0.128 mL∙cm−2∙min−1), the highest working potential (1.630 V) and energy density (2415 mWh·g−1), a higher capacity (1481 mAh·g−1) and anodic utilization (49.75%).

A comparative study of NaOH and KOH electrolytes in micro-ECM

ABSTRACT Tungsten microtool electrode is one of the preferred tool electrodes in micro electrochemical machining (µECM) of hard to machine materials. During the pilot experiments with different types of electrolytes materials (such as NaOH, HNO3, NaBr, KOH, H2SO4, NaCl, NaNO3 and HCl), it has been found that KOH(Aq.) and NaOH(Aq.) electrolytes are suitable for the fabrication of tungsten microtools through µECM process. Therefore in this research, a comparative study between NaOH(Aq.) and KOH(Aq.) electrolytes have been carried out in the fabrication of tungsten microtools through µECM. DC voltage (V), electrolyte concentration (Mol/L) and machining time (Minutes) are chosen as machining parameters in order to investigate their role on response outputs i.e. tool radius reduction (Δ) and material removal rate (MRR). Roles of machining parameters on the response output are analysed through Taguchi design technique and ANOVA is employed to determine the dominant machining parameters on the response outputs. Experimental results indicate ‘Δ’ and ‘MRR’ obtained with NaOH(Aq.) is greater than ‘Δ’ and ‘MRR’ obtained with KOH(Aq.) respectively at most of the experimental run. But microscopic view of the fabricated microtools indicate that the surface uniformity throughout the length of the microtools obtained with KOH(Aq.) electrolyte is favourable than NaOH(Aq.).

Synthesis, physical and electrochemical properties of the spinel CoFe2O4: Application to the photocatalytic hydrogen production

This research is achieved for the preparation of CoFe 2 O 4 with a high purity and crystanillity by nitrate route followed by a calcination at 850 °C. The material exhibits a single phase with a cubic symmetry. The electrochemistry performed in Na 2 SO 4 solution shows a stable semiconductor with a small exchange current density (112 μA cm −2 ). The capacitance-potential measurement indicates p -type behavior, typically related to the metal insertion in octahedral sites. The narrow band gap semiconductor with a direct optical transition of 1.27 eV is due to the lifting of degeneracy of Fe 3+ : 3d orbital in 6-fold coordination, making it attractive for the photo-electrochemical (PEC) conversion. Moreover, its cathodic comportment evidenced from the negative conduction band compared to the potential of the water reduction makes it an ideal candidate for the hydrogen production. The experimental data shows a great activity for the evolution of hydrogen with an average rate of 74 μmol min −1 g cat −1 and a quantum efficiency of 0.34% under visible illumination (23 mW cm −2 ). The use of C 2 O 4 2− as reducing agent increased substantially the performances by a factor of 57%. • The spinel CoFe 2 O 4 prepared by nitrate route is a narrow band gap semiconductor with a crystallite size of 27 nm. • CoFe 2 O 4 with an optical band gap of 1.27 eV is sensitive over the whole visible region. • The oxalate C 2 O 4 2− acting as sacrificial agent enhances the H 2 production in NaOH electrolyte. • The conduction band (−0.5 V SCE ) derived from Fe 3+ : e g orbital, is more cathodic than the H 2 O/H 2 level (∼-0.4 V SCE ). • H 2 evolution rate of 74 μmol min −1 (g catalyst) −1 and quantum yield of 0.34% were obtained under visible light (23 mW cm −2 ).

Electroreforming of Glucose/Xylose Mixtures On PdAu Based Nanocatalysts

AbstractThe electroreforming of glucose/xylose mixtures has been evaluated at Pd1‐xAux/C anodes in 0.10 mol L−1 NaOH electrolyte. The catalysts synthesized by a wet chemistry route are comprehensively characterized by physicochemical and electrochemical techniques. From linear scan voltammetry and in situ Fourier transform infrared spectroscopy measurements, it was shown that the Pd0.3Au0.7/C material led to the best electrocatalytic behavior towards the electrooxidation of glucose/xylose mixtures in terms of activity (higher current densities at lower potentials) and selectivity (lower dissociative adsorption). Six‐hour chronoamperometry measurements were performed at 293 K in a 25 cm2 electrolysis cell at +0.4 V and +0.6 V and the reaction products were analyzed by high performance liquid chromatography. The main products were gluconate and xylonate, but the contributions of xylose to all formed products was always lower in percentages than the initial xylose ratios in solutions, showing that glucose was more electro‐reactive than xylose at Pd0.3Au0.7 surface.

Green synthesis of cobalt oxide thin films as an electrode material for electrochemical capacitor application

In this study, we report on the fabrication and characterization of cobalt oxide (Co3O4) thin film that is potentially important for electrochemical capacitor applications. For that purpose, the precursor powder of Co3O4 was prepared using the cost-effective sol-gel synthesis route and heat treatment at a relatively low temperature. A thin film of Co3O4 was prepared on a fluorine-doped tin oxide (FTO) substrate using a simple doctor-blade method. X-ray diffraction and Raman spectroscopy confirmed the formation of pure Co3O4 thin film on FTO, and scanning and transmission electron microscopy confirmed the nanoscale nature of the particles in the film. The electrochemical studies revealed a specific capacitance of 237 ​F ​g-1 for the Co3O4 electrode, with a remarkable cycling stability in 1 ​M NaOH electrolyte, and 77% capacity retention after 2000 cycles at 5 ​mA ​cm-2 current density (833 ​mA ​g-1); this demonstrates that Co3O4 is a promising material for electrochemical devices. Further, the electrochemical impedance measurements revealed an internal (solution) of 10 ​Ω, whereas the charge transfer resistance between the electrode and the electrolyte was roughly 40 ​Ω.

Electrochemical behavior of spray deposited nickel oxide (NiO) thin film in Alkaline electrolyte

Nickel oxide (NiO) Thin film was successfully deposited on the glass substrate using an inexpensive spray pyrolysis (SP) technique. The structural, morphological, and optical properties have been studied, thus the electrochemical behavior of NiO film in Alkaline electrolytes has been investigated. The X-ray diffraction (XRD) analysis showed that NiO thin film exhibit a polycrystalline cubic rock-salt structure with a preferential orientation on the plane (111). This result was confirmed using Raman spectroscopy. The Scanning Electron Microscopy (SEM) images exhibit a smooth and dense surface without major cracks. Optical analysis shows an average transmission of about 55% in the visible light range, and the optical band gap energy was estimated by Tauc’s method and showed a value of 3,71 eV. Electrochemical properties as specific capacitance (Csp), optical density variation (ΔOD), and Coloration efficiency (CE) were studied using cyclic voltammetry in 1M KOH and 1M NaOH electrolytes. The results indicated that the behavior of the NiO layer in KOH is more effective than in NaOH electrolytes.