Influence of zinc additive and pH on the electrochemical activities of β-nickel hydroxide materials and its applications in secondary batteries

Kumar, C. Ravi; Kotteeswaran, P.; Raju, V. Bheema; Murugan, A.; Santosh, M.S.; Nagaswarupa, H.P.; Prashantha, S.C.; Kumar, Manjeet; Shivakumar, Muthugounder Subramanian

doi:10.1016/j.est.2016.11.001

Cited by 85 publications

(18 citation statements)

References 50 publications

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“…In the given circuits, solution resistance (Rs), charge transfer resistance (Rct) and the double-layer capacitance (C) were calculated by intercepting the semicircle on the real axis and electrode-electrolyte interface in high-frequency region, whereas the Warburg element (W) was calculated by straight line in the low-frequency region. Q 1 : constant phase element which was parallel to Rct and Q 2 : the low frequency capacitance parallel to the leakage resistance (R l ) [54][55][56]. A drastic variation of oxidation and reduction peak positions confirms that, MNO:Sm 3+ (5 mol%) was an effective material for chemical sensor applications in alkaline medium for quantities of 1-8 mM concentrations (Fig.…”

Section: Inset Ofmentioning

confidence: 98%

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Basavaraju¹,

Prashantha²,

Nagabhushana

et al. 2021

SN Appl. Sci.

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Novel Sm3+ doped columbite-type orthorhombic structured MgNb2O6 (MNO) orange-red emitting phosphors were prepared by solution combustion method using ODH as a fuel. The powder phase purity, particle morphology, size, elemental composition, luminescence properties, photocatalytic behaviors and electrochemical studies of prepared samples were studied in detail. Photoluminescence emission spectra of MNO:Sm3+ nanophosphors show all the characteristic emissions of Sm3+ cations corresponds to the transitions 4G5/2 → 6Hj/2(j=5,7,9,11) when excited at 463 nm energy. Among these the strongest emission peak was at 608 nm which corresponds to 4G5/2 → 6H7/2 transition of Sm3+ cations in the host lattice. The luminescence quenching was confirmed by the dipole–dipole interaction among Sm3+ ions. As a result of J-O analysis the branching ratio (~ 58% > 50%) show that the phosphor was highly suitable for color display devices. Photocatalytic activity of MNO:Sm3+ (5 mol%) under UV light shows 99% degradation of AR-88 dye. Electrochemical Impedance Spectroscopy (EIS) confirms the reversibility of the redox reaction, which helps in sensing the presence of paracetamol and alcohol. Thus, MNO:Sm3+ phosphors have great potential applications in display, catalytic, photonic, chemical and thermal sensor applications.

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Section: Inset Ofmentioning

confidence: 98%

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Basavaraju¹,

Prashantha²,

Nagabhushana

et al. 2021

SN Appl. Sci.

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show abstract

“…5(b) correlates the cathodic peak current (ip) with the scan rate (ν1/2). The linear behavior suggests the electrode reaction of gsc-CONPs is restricted by hydrogen diffusion [19]. Using the slope of the fitted line in Fig.…”

Section: Electrochemical Analysismentioning

confidence: 97%

“…where R is the absolute reflectance of the sample and F(R) is the Kubelka-Munk function. The optical band gap of the prepared sample was calculated using Tauc relation as in equation 2, where n = 2 for a direct allowed transition and n = 1/2 for an indirectly allowed transition, A is the constant, and hυ is the photon energy [18,19]. Ideally, the linear portion of the curve was extrapolated to (F(R)hυ) 2 = 0 to get the direct band gap energy value of 1.75 eV as shown in Fig.…”

Section: Uv-drs Studiesmentioning

confidence: 99%

Synthesis and Characterization of Green CuO using Centella Asiatica Plant Leaf Extract: Electrochemical and Photocatalytic Activities

Rudresha¹,

Hussain²,

Ravikumar³

et al. 2020

Adv. Mater. Lett.

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“…15. The real component Z real reveals the ohmic properties while the imaginary part (Z img ) relates to the capacitive properties 46 . Typically, semicircles with larger radii refer to higher charge transfer resistance of the electrodes 47 .…”

Section: Decolorization Of Titan Yellow (Ty) Andmentioning

confidence: 99%

Enhanced photocatalytic and electrochemical performance of TiO2-Fe2O3 nanocomposite: Its applications in dye decolorization and as supercapacitors

Kumar¹,

Abebe

Nagaswarupa

et al. 2020

Sci Rep

117

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this work reveals a green combustion route for the synthesis of tio 2 , fe 2 o 3 and tio 2 -fe 2 o 3 nanocomposites as photocatalysts for decolorization of titan Yellow (tY) and Methyl orange (Mo) dyes at room temperature in aqueous solution concentration of 20 ppm under UV-light irradiation. We observed that the tio 2 -fe 2 o 3 nanocomposite shows superior photocatalytic activity for tY dye compared to pure tio 2 and fe 2 o 3 . Rate constant (k) values of tio 2 , fe 2 o 3 and tio 2 -fe 2 o 3 for tY and Mo are 0.0194, 0.0159, 0.04396 and 0.00931, 0.00772 0.0119 kmin −1 respectively. the surface area and pore volume of tio 2 -fe 2 o 3 nanocomposite were found to be 71.56 m 2 /g and 0.076 cm 3 /g, respectively as revealed by Bet studies. from the Barrett-Joyner-Halenda (BJH) plot, the mean pore diameter of tio 2fe 2 o 3 nanoparticles was found to be 2.43 nm. Further, the TiO 2 -fe 2 o 3 nanocomposite showed good electrochemical behavior as an electrode material for supercapacitors when compared to pure tio 2 and fe 2 o 3 nanoparticles resulted in stable electrochemical performance with nearly 100% coulombic efficiency at a scan rate of 10 mV/s for 1000 cycles. Interestingly, the novelty of this work is that the designed supercapacitors showed stable electrochemical performance even at 1000 th cycle, which might be useful for rechargeable supercapacitor applications. the electrochemical properties of the nanocomposites were compared by the data obtained by cyclic voltammograms, charge-discharge tests and electrochemical impedance spectroscopic studies. these results demonstrated that the tio 2fe 2 o 3 nanocomposite showed stable performance compared to tio 2 and fe 2 o 3 nanoparticles at current density of 5 Ag −1 .Recently electrochemical studies have gained significant attention due to energy and environment related issues. Since the discovery of TiO 2 and its applications as photo-anode for battery, splitting of water, supercapacitor, dye removal etc 1 ., many different metal oxides and electrodes have been explored to enhance the energy conversion efficiency. Amongst a variety of semiconductor metal oxides, hematite (α-Fe 2 O 3 ) was found to be a good anode material for supercapacitor application, which could be attributed to its high solar-to-hydrogen efficiency, encouraging optical band gap (~2 eV), outstanding chemical strength as well as ease of availability in the nature. However, α-Fe 2 O 3 exhibits low experimental performance compared with the theoretical values, which is possibly due to poor conducting and oxygen evolution properties in addition to short whole diffusion length. To overcome these problems, various synthetic methods have been tried in the recent past, to improve the experimental performance of α-Fe 2 O 3 .But, solution-based combustion method is a simple, low cost, energy saving, easy to control the surface morphology and particle size 2 . In addition, the materials prepared in this method are organic solvent free as we used water as solvent 3-5 .

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Influence of zinc additive and pH on the electrochemical activities of β-nickel hydroxide materials and its applications in secondary batteries

Cited by 85 publications

References 50 publications

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

Synthesis and Characterization of Green CuO using Centella Asiatica Plant Leaf Extract: Electrochemical and Photocatalytic Activities

Enhanced photocatalytic and electrochemical performance of TiO2-Fe2O3 nanocomposite: Its applications in dye decolorization and as supercapacitors

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