An investigation of chemical and electrochemical conversion of SILAR grown Mn3O4 into MnO2 thin films

Desai, Mangesh A.; Vedpathak, Amol S.; Bhapkar, Abhishek R.; Saratale, Ganesh Dattatraya; Sartale, Shrikrishna D.

doi:10.1016/j.jenvman.2021.113564

Cited by 13 publications

(12 citation statements)

References 44 publications

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“…Dubal et al, 37 reported that during the CV cycling of Mn 3 O 4 electrode in Na 2 SO 4 solution, the area of the CV curve was goes on increasing, which revealed the conversion of the material from Mn 3 O 4 (spinel) to Na-birnessite (Na δ MnO 2 .nH 2 O) phase. 7,[37][38][39][40] This similar trend of phase changing activity was exhibited in our case as well, which is confirmed from the Raman data of Mn 3 O 4 film after the 100th cycle (Fig. 5b).…”

Section: Sample Concentrationsupporting

confidence: 89%

Molarity Influenced Interesting Electrochromic Optical Modulation Peak Shift in Nebulized Spray Deposited Mn₃O₄ Films

Vignesh¹,

Sivakumar²,

Slimani³

et al. 2023

J. Electrochem. Soc.

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Herein, we report the investigations on the electrochromic properties of nebulized-spray deposited Mn3O4 thin films in Na2SO4 aqueous solution as a function of molar concentration, for the first time. Phase analysis reveals that the films possess a tetragonal structure. From the Raman study, strong Mn2+ breathing vibration(in Mn-O) occurred in tetrahedral sites(of spinel Mn3O4). At 0.02 M, the film surface is covered with very-tiny particles with 84% highest optical transparency average. Both transmittance and absorbance related properties of electrochromic states are consider here, while introducing the notions of transmittance modulation(∆T), absorbance modulation(∆A), transmittance modulation efficiency(TME) and absorbance modulation efficiency(AME (or) coloration efficiency). When the concentration increases, the red shift was occurred at highest peaks of ∆T, ∆A, TME and AME with respect to the decrease in optical band gap. The maximum AME and TME of 25.064 cm2C-1 (at 369.1 nm) and 17.542 cm2C-1(at 438.6 nm) were obtained for prepared samples. After the 100th cycle, the average AME(and TME)values in the UV and visible regions are decreases from 18.910 to 2.783 cm2C-1(2.884 to 1.060 cm2C-1) and from 11.089 to 4.772 cm2C-1(11.346 to 4.684 cm2C-1), respectively, indicating that the film is electrochromically active in the visible region even after the 100th cycle.

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Section: Sample Concentrationsupporting

confidence: 89%

Molarity Influenced Interesting Electrochromic Optical Modulation Peak Shift in Nebulized Spray Deposited Mn₃O₄ Films

Vignesh¹,

Sivakumar²,

Slimani³

et al. 2023

J. Electrochem. Soc.

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“…In the high-frequency region, both display a small intercept with the real axis, which is accredited to the lesser internal resistance of the electrode material, ionic resistance of the electrolyte, and contact resistance at the electrode material and current collector interface. [47,48] This intercept with the real axis is known as equivalent series resistance (R s ), which denotes the electrolyte solution resistance and the contact-charge transfer resistances at the electrode-electrolyte interface. From the EIS measurement, the R s value was found to be 4.9 and 3.8 Ω for V 2 O 5 and LiVO 3 nanorods electrodes, respectively.…”

Section: Electrochemical Analysismentioning

confidence: 99%

1D Layered LiVO₃ Nanorods Synthesized by Ultrasonic‐Assisted Chemical Route for Supercapacitor Applications

Shinde,

Vedpathak,

Nagare

et al. 2023

Energy Tech

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Herein, 1D layered lithium vanadate (LiVO3) nanorods are successfully synthesized using a facile ultrasonic‐assisted chemical route using V2O5 as the starting material. The as‐prepared LiVO3 nanorods are characterized by X‐ray diffraction, X‐ray photoelectron spectroscopy, and field emission scanning electron microscopy techniques. The reaction and growth mechanism of LiVO3 nanorods formation are provided. The synthesized LiVO3 nanorods are used as electrode material for supercapacitor applications and exhibit a high specific capacitance of 426.2 F g−1 at 0.5 A g−1. Additionally, the LiVO3 // AC asymmetric coin cell supercapacitor device fabricated with LiVO3 as the cathode shows an excellent energy density of 25.4 Wh kg−1 at a power density of 228.5 Wkg−1 along with superior cyclic stability of ≈80% after 5000 cycles and wide operating voltage window of 1.6 V. Density functional theory studies show that the decrease in the bandgap of the LiVO3 is one of the intrinsic reasons that the conductivity and capacitive charge storage performance are greatly improved over V2O5. This design of a 1D layered LiVO3 nanorods presented in this work will provide a path to discover high performing electrode materials for supercapacitor applications.

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“…Previously, we proved that when KMnO 4 reacted with a reducing agent, it leads to pre-insertion of K + ions to the MnO 2 structure. 14,46 Similarly, during the green synthesis of K-MnO 2 , KMnO 4 dissociates into K + and MnO 4 − in water, and thereafter, reduction of MnO 4 − ions occurs by aloe vera leaf extract. Simultaneously, the K + ions present in the vicinity of the reacting species are inserted inside the MnO 2 matrix.…”

Section: ■ Experimental Detailsmentioning

confidence: 99%

“…The performance of SCs is highly dependent on the nature and physicochemical properties of electrode materials. Such electrode materials have been synthesized using a variety of methods. − The physical methods involve high-vacuum conditions and a clean environment but require sophisticated instruments, whereas the chemical methods involve hazardous chemicals, and sometimes, there is a possibility of production of toxic byproducts. However, the green synthesis is well known for synthesizing nanomaterials by an environment-friendly way using bacteria, fungi, plants, and so forth .…”

Section: Introductionmentioning

confidence: 99%

Green Strategy for the Synthesis of K⁺ Pre-inserted MnO₂/rGO and Its Electrochemical Conversion to Na-MnO₂/rGO for High-Performance Supercapacitors

et al. 2022

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An eco-friendly and low-cost green strategy has opted to synthesize K+ ion pre-inserted MnO2 (K-MnO2) and its hybrid with reduced graphene oxide (K-MnO2/rGO) nanostructures using aloe vera leaf extract (an effective reducing and capping agent). K-MnO2 and K-MnO2/rGO hybrid formations were confirmed by X-ray diffraction, Raman, and X-ray photoelectron spectroscopy measurements. The K-MnO2/rGO hybrid was found to be a better electrode material for supercapacitor application. By performing cyclic voltammetry measurements in 1 M Na2SO4 electrolyte solution, we found that the K+ ions present inside the MnO2 structure get replaced by the Na+ ions present in the electrolyte leading to Na+ ion inserted MnO2 (Na-MnO2) formation. The phase transformation of K-MnO2/rGO to Na-MnO2/rGO was confirmed using Raman and XPS analyses. This electrochemical phase transformation by Na+ ion intercalation improves the overall supercapacitive performances. It was revealed that, during the electrochemical cyclic process, the specific capacitance values of the K-MnO2/rGO hybrid hiked more than 4 times due to Na+ ion intercalation. The possible conversion mechanism of K-MnO2 to Na-MnO2 is provided. Fabrication of an asymmetric supercapacitor of Na-MnO2/rGO//activated carbon displays a high operating potential window of 2.2 V, a maximum energy density of 44.4 W h kg–1, and a power density of 8.79 kW kg–1.

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An investigation of chemical and electrochemical conversion of SILAR grown Mn3O4 into MnO2 thin films

Cited by 13 publications

References 44 publications

Molarity Influenced Interesting Electrochromic Optical Modulation Peak Shift in Nebulized Spray Deposited Mn₃O₄ Films

Molarity Influenced Interesting Electrochromic Optical Modulation Peak Shift in Nebulized Spray Deposited Mn₃O₄ Films

1D Layered LiVO₃ Nanorods Synthesized by Ultrasonic‐Assisted Chemical Route for Supercapacitor Applications

Green Strategy for the Synthesis of K⁺ Pre-inserted MnO₂/rGO and Its Electrochemical Conversion to Na-MnO₂/rGO for High-Performance Supercapacitors

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An investigation of chemical and electrochemical conversion of SILAR grown Mn3O4 into MnO2 thin films

Cited by 13 publications

References 44 publications

Molarity Influenced Interesting Electrochromic Optical Modulation Peak Shift in Nebulized Spray Deposited Mn3O4 Films

Molarity Influenced Interesting Electrochromic Optical Modulation Peak Shift in Nebulized Spray Deposited Mn3O4 Films

1D Layered LiVO3 Nanorods Synthesized by Ultrasonic‐Assisted Chemical Route for Supercapacitor Applications

Green Strategy for the Synthesis of K+ Pre-inserted MnO2/rGO and Its Electrochemical Conversion to Na-MnO2/rGO for High-Performance Supercapacitors

Contact Info

Product

Resources

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Molarity Influenced Interesting Electrochromic Optical Modulation Peak Shift in Nebulized Spray Deposited Mn₃O₄ Films

Molarity Influenced Interesting Electrochromic Optical Modulation Peak Shift in Nebulized Spray Deposited Mn₃O₄ Films

1D Layered LiVO₃ Nanorods Synthesized by Ultrasonic‐Assisted Chemical Route for Supercapacitor Applications

Green Strategy for the Synthesis of K⁺ Pre-inserted MnO₂/rGO and Its Electrochemical Conversion to Na-MnO₂/rGO for High-Performance Supercapacitors