Preparation of double nickel(II) cobalt(II) phosphates with controlled cationic composition

Prokopchuk, N. N.; Копілевич, В. А.; Войтенко, Л. В.

doi:10.1134/s1070427208030063

Cited by 19 publications

(7 citation statements)

References 4 publications

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“…The sharp absorption bands at 1006 and 1094 cm –1 are ascribed to the asymmetric and symmetric stretching vibrations of the PO 4 ̅ group and P–O, respectively. The characteristic band around 1636 cm –1 presents the water molecules (H–O–H) bending vibration mode, , and the intensity of the band progressively increases from CoPOU-1 to CoPOU-4 sample, indicating increasing structural water in cobalt phosphate thin films. Furthermore, the absorption small band at 1993 cm –1 and wide band at 3105 cm –1 are attributed to the stretching vibration mode of O–H from the water molecule .…”

Section: Resultsmentioning

confidence: 99%

Enhanced Energy Density of All-Solid-State Asymmetric Supercapacitors Based on Morphologically Tuned Hydrous Cobalt Phosphate Electrode as Cathode Material

Katkar

Marje

Pujari

et al. 2019

ACS Sustainable Chem. Eng.

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In the present investigation, microflowers-like hydrous cobalt phosphate is prepared via a facile single-step hydrothermal method on stainless steel substrate. The microflowers-like morphology of hydrous cobalt phosphate thin film consists of microplates and further microplates converted to flakes by means of a change in length, width, and thickness with urea variation. Hydrous cobalt phosphate thin film electrode demonstrates a high specific capacitance of 800 F g −1 at 2 mA cm −2 with 33.62 Wh kg −1 energy density and 3.12 kW kg −1 power density. By taking advantage of hydrous cobalt phosphate thin film (as a cathode electrode) and copper sulfide thin film (as an anode electrode), the asymmetric devices (aqueous/all-solid-state) are fabricated. Aqueous asymmetric device shows a high specific capacitance of 163 F g −1 at 2 mA cm −2 with an energy density of 58.12 Wh kg −1 and power density of 3.52 kW kg −1 . Moreover, the all-solid-state asymmetric supercapacitor device delivers a high specific capacitance of 70 F g −1 at 2 mA cm −2 with 24.91 Wh kg −1 energy density and 2.63 kW kg −1 power density in PVA−KOH gel electrolyte. The long-term cyclic stability (94% after 3000 cycles) and actual practical demonstration (lightning 65 red LEDs) suggest an industrial application of the allsolid-state asymmetric device.

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Section: Resultsmentioning

confidence: 99%

Enhanced Energy Density of All-Solid-State Asymmetric Supercapacitors Based on Morphologically Tuned Hydrous Cobalt Phosphate Electrode as Cathode Material

Katkar

Marje

Pujari

et al. 2019

ACS Sustainable Chem. Eng.

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“…The amorphous phase can reveal distinctive physical and electrochemical features because of its unique disordered structure and defect-rich properties. , Furthermore, an FT-IR spectrum was recorded to identify the presence of functional groups in as-prepared cobalt phosphate thin film (Figure b). In the FT-IR spectrum, the characteristic peaks of ν1 (573 cm –1 ) and ν2 (781 cm –1 ) correspond to Co–O bond vibration and lattice vibration mode, respectively, are observed. , The little broad absorption band of ν3 (1059 cm –1 ) is assigned to symmetric stretching vibrations of the PO 4 3– bond . Furthermore, the peak of ν4 (1359 cm –1 ) describes the O–H bending vibration .…”

Section: Resultsmentioning

confidence: 95%

“…25,26 The little broad absorption band of ν3 (1059 cm −1 ) is assigned to symmetric stretching vibrations of the PO 4 3− bond. 27 Furthermore, the peak of ν4 (1359 cm −1 ) describes the O−H bending vibration. 25 The bending vibration mode of water molecules (H−O−H) is observed at 1610 cm −1 (ν5).…”

Section: Resultsmentioning

confidence: 99%

“…25 The bending vibration mode of water molecules (H−O−H) is observed at 1610 cm −1 (ν5). 27 The wide band of ν6 (3423 cm −1 ) is assigned to stretching vibration of −OH in crystallization or structural water. 28 It is noted that the presence of adsorbed structural water can be a help to improve the performance by increasing the interparticle distance, which can tune the ion career path.…”

Section: Resultsmentioning

confidence: 99%

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Binder-Free Synthesis of Nanostructured Amorphous Cobalt Phosphate for Resistive Memory and Artificial Synaptic Device Applications

Katkar

Padalkar

Kumbhar

et al. 2022

ACS Appl. Electron. Mater.

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The rise of artificial intelligence and machine learning demands versatile electronic devices for memory and braininspired computing applications. The electronic materials are the backbones of these applications. Considering this, a functional Co x (PO 4 ) 2 nanomaterial was synthesized for resistive memory and neuromorphic computing applications. The synthesized nanomaterial was well characterized by using X-ray diffraction, Fourier transform infrared spectroscopy, field emission-scanning electron microscopy, and X-ray photoelectron spectroscopy. The fabricated Ag/Co x (PO 4 ) 2 /ITO device shows bipolar resistive switching and memristive properties. The SET and RESET voltages were analyzed by using different statistical measures, and their distribution was studied by using the Weibull technique. The results suggested that the SET voltages were more uniformly distributed than the RESET voltage. The switching nonlinearity was modeled and predicted by using Holt's exponential smoothingbased statistical time series analysis method. In the case of nonvolatile memory tests, the device shows good endurance (10 3 cycles) and memory retention (3 × 10 4 s) with excellent memory window (1.7 × 10 3 ) properties. Moreover, the device can mimic the potentiation−depression and spike-timing-dependent plasticity-based Hebbian learning rules, suggesting Co x (PO 4 ) 2 is a potential nanomaterial for the fabrication of artificial synapse. The detailed analysis of electrical results suggested that the space-charge-limited current-based charge transport was responsible for the device conduction, whereas the formation and rupture of conductive filament(s) were responsible for the resistive switching in the Ag/Co x (PO 4 ) 2 /ITO memristive device. The results of the present investigation suggested that the Co x (PO 4 ) 2 nanomaterial is a potential candidate for resistive memory and brain-inspired computing applications

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“…49 The peaks (g 3 -g 5 ) are noted in the region of 857-1076 cm À1 , conrm the symmetric and asymmetric P-O stretching vibrational modes of PO 4 3À anions. 50,51 The absorption peaks (g 6 , g 7 ) in the region of 1400-1644 cm À1 correspond to the bending modes of the water molecule (H-O-H). 51,52 Moreover, the peaks (g 8 , g 9 ) in the range of 3000-3464 cm À1 belonged to O-H stretching vibration modes of the adsorbed water content in the material.…”

Section: Structural and Morphological Analysismentioning

confidence: 99%

Intercalation-type pseudocapacitive clustered nanoparticles of nickel–cobalt phosphate thin films synthesized via electrodeposition as cathode for high-performance hybrid supercapacitor devices

et al. 2022

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Preparation of double nickel(II) cobalt(II) phosphates with controlled cationic composition

Cited by 19 publications

References 4 publications

Enhanced Energy Density of All-Solid-State Asymmetric Supercapacitors Based on Morphologically Tuned Hydrous Cobalt Phosphate Electrode as Cathode Material

Enhanced Energy Density of All-Solid-State Asymmetric Supercapacitors Based on Morphologically Tuned Hydrous Cobalt Phosphate Electrode as Cathode Material

Binder-Free Synthesis of Nanostructured Amorphous Cobalt Phosphate for Resistive Memory and Artificial Synaptic Device Applications

Intercalation-type pseudocapacitive clustered nanoparticles of nickel–cobalt phosphate thin films synthesized via electrodeposition as cathode for high-performance hybrid supercapacitor devices

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