Microstructure and supercapacitive properties of rf-sputtered copper oxide thin films: influence of O2/Ar ratio

Purusottam-Reddy, B.; Sivajee-Ganesh, Kapu; Jayanth-Babu, K.; Hussain, O. M.; Julien, C.

doi:10.1007/s11581-015-1403-5

Cited by 34 publications

(12 citation statements)

References 34 publications

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“…3):Csp=ImdtdV,where C sp is the specific capacitance (in F g −1 ), I is the charge/discharge current, t is the time of discharge, V is the voltage difference between the upper and lower potential limits, and m is the mass of the active material [39]. Using Eq.…”

Section: Resultsmentioning

confidence: 99%

Li2TiO3/Ni foam composite as high-performance electrode for energy storage and conversion

Lakshmi-Narayana¹,

Dhananjaya²,

Prakash³

et al. 2019

Heliyon

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Li 2 TiO 3 /Ni foam composites were prepared by a solid-state reaction process. They crystallized in the monoclinic Li 2 TiO 3 structure with C 2/ c space group. SEM images show that the Li 2 TiO 3 particles are monodispersed crystallites of average size 49 nm, infused into porous scaffold Ni foam. As an anode in lithium battery, the composite delivered a discharge capacity of 153 mAh g −1 in an aqueous electrolyte and retained 95% of its initial capacity after 30 cycles. Moreover, the Li 2 TiO 3 /Ni foam composite as a negative electrode of pseudo-supercapacitor delivered a specific capacitance of 593 F g −1 and retained 95% of its initial capacitance after 1000 cycles. The enhanced capacity of Li 2 TiO 3 /Ni composite is due to porous scaffold Ni foam, which provides high conductivity to the Li 2 TiO 3 particles and high effective surface area for redox reactions. The performance of the Li 2 TiO 3 /Ni foam as an electrode material for both lithium-ion batteries (LIBs) and supercapacitors (SCs) shows that this composite is promising for energy storage devices.

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Section: Resultsmentioning

confidence: 99%

Li2TiO3/Ni foam composite as high-performance electrode for energy storage and conversion

Lakshmi-Narayana¹,

Dhananjaya²,

Prakash³

et al. 2019

Heliyon

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“…Where C sp is the specific capacitance (in Fg −1 ), I is the charge/discharge current, t is the time of discharge, V is the voltage difference between the upper and lower potential limits, and m is the mass of the active material [59]. TNFs electrode demonstrates the C sp values of the 75, 50, 35.7 and 22.7 Fg −1 respectively at current densities of 1, 5, 10, 100 mAg −1 .…”

Section: Electrochemical Propertiesmentioning

confidence: 99%

Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

Narayana

Hussain

Reddy

2020

Mater. Res. Express

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Nanofibers are one dimensional (1D) nanoarchitecture materials having high surface-to-volume ratio which provides improved ion diffusion and high mechanical strength to prevent volume expansion during electrochemical process and enhance the cycle stability. In the present study, TiO 2 nanofibers (TNFs) were successfully synthesized on an aluminum collector with a polymer concentration of 9 wt % by cost-effective electrospinning technique followed by annealing at a temperature 500°C. The XRD spectrum of electrospun TNFs exhibited predominant (101) orientation corresponding to anatase TiO 2 with I4 1 /amd symmetry. The estimated average crystallite size is 18 nm. The strongest Raman vibrational mode at 143 cm −1 confirms the phase purity of TNFs. The surface morphological feature depicts interconnected network fibers with a variation in the fiber diameter and the estimated average diameter is ∼150±20 nm. Very smooth surface and homogenously distributed ultra long nanofibers are observed from TEM analysis. The newly fabricated TNF electrode delivered a specific capacitance of 75 Fg −1 and retained 95% capacitance even after 5000 cycles. Moreover, it exhibited energy density and power density values of 24 Whkg −1 and 22.08 Wkg −1 respectively. The large capacitance, high coulombic efficiency and good structural stability demonstrate that TNFs should open up new opportunities for the next-generation high performance supercapacitors.

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“…Further, during deposition, thermally activated parameters such as the relaxation time to dissipate the kinetic energy of sputtered species, surface diffusion and structural changes in the surface are effectively influenced by the oxygen partial pressure and the substrate temperature. A previous work showed that changes in the phase of copper oxide films from metallic copper to Cu 2 O and Cu 2 O to Cu 4 O 3 and then to CuO were observed by varying the ratio of the O 2 /Ar gas mixture from 1:25 to 1:1 [42]. The reported capacitance for the films was 357 F g −1 at a low current density of 0.5 mA cm −2 .…”

Section: Introductionmentioning

confidence: 95%

“…Among these film deposition processes, radio-frequency (RF) magnetron sputtering is one of the most pre-eminent industrial practical techniques to achieve high-quality and uniform thickness films with the required chemical composition [35]. For two decades, RF magnetron sputtering has become the most popular deposition technique for the growth of crystalline CuO films [36][37][38][39][40][41][42][43][44][45]. Further, during deposition, thermally activated parameters such as the relaxation time to dissipate the kinetic energy of sputtered species, surface diffusion and structural changes in the surface are effectively influenced by the oxygen partial pressure and the substrate temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Extensive investigations have been conducted on the growth of CuO films using RF magnetron sputtering by varying all deposition parameters, i.e., T s , Ar/O 2 ratio and RF power, which is a single-step process. The optimized deposition conditions of the O 2 -to-Ar gas flow ratio at 1:7 and RF power at 250 W determined in earlier work [42] are kept constant and the temperature of the Si substrate is varied to obtain high supercapacitance performance. Growth of a single-phase CuO film with a good crystalline nature is very difficult.…”

Section: Introductionmentioning

confidence: 99%

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RF Sputter-Deposited Nanostructured CuO Films for Micro-Supercapacitors

et al. 2021

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Copper oxide is considered as an alternative electrode material for supercapacitors due to its low cost, chemical stability and high theoretical specific capacitance. In the present work, nanostructured copper oxide (CuO) films are prepared by radio-frequency (RF) magnetron sputtering, and the influence of the substrate temperature on the microstructure and supercapacitive properties was studied. The copper oxide films prepared at 350 °C exhibit a predominant (1¯11) orientation corresponding to the monoclinic Cu(II)O phase with a crystallite size of 24 nm. The surface of the film consists of uniformly distributed oval-like grains providing a high surface roughness of 45 nm. The films exhibit an optical bandgap of 1.68 ± 0.01 eV and an electrical conductivity of 0.4 S cm−1 at room temperature. The as-prepared CuO films deliver a discharge specific capacitance of 387 mF cm−2 (375 F g−1) at a current density of 1 mA cm−2 with excellent cyclic capacitance retention of 95% (367 mF cm−2) even after 1000 cycles. Hence, these films are potential electrodes for micro-supercapacitors.

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Microstructure and supercapacitive properties of rf-sputtered copper oxide thin films: influence of O2/Ar ratio

Cited by 34 publications

References 34 publications

Li2TiO3/Ni foam composite as high-performance electrode for energy storage and conversion

Li2TiO3/Ni foam composite as high-performance electrode for energy storage and conversion

Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors

RF Sputter-Deposited Nanostructured CuO Films for Micro-Supercapacitors

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Microstructure and supercapacitive properties of rf-sputtered copper oxide thin films: influence of O2/Ar ratio

Cited by 34 publications

References 34 publications

Li2TiO3/Ni foam composite as high-performance electrode for energy storage and conversion

Li2TiO3/Ni foam composite as high-performance electrode for energy storage and conversion

Electrospun TiO2 nanofiber electrodes for high performance supercapacitors

RF Sputter-Deposited Nanostructured CuO Films for Micro-Supercapacitors

Contact Info

Product

Resources

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Electrospun TiO₂ nanofiber electrodes for high performance supercapacitors