Enhanced energy density and stability of self-assembled cauliflower of Pd doped monoclinic WO3 nanostructure supercapacitor

Gupta, Shobhnath P.; Patil, V. B.; Tarwal, N.L.; Bhame, Shekhar D.; Gosavi, Suresh; Mulla, I.S.; Late, Dattatray J.; Suryavanshi, S.S.; Walke, Pravin S.

doi:10.1016/j.matchemphys.2018.12.077

Cited by 43 publications

(20 citation statements)

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“…In the case of the hydrated WO3−x, at a power density of 803 W kg −1 , an energy density of 60 W h kg −1 was obtained. When the power density increased to 2520 W kg −1 , the energy density was 36 W h kg −1 (see Figure 9b), which is quite impressive as compared with earlier reports about modified metal oxides (Table S2) [32,33,35,[66][67][68][69][70][71][72][73][74].…”

Section: Non-aqueous Electrolytesupporting

confidence: 76%

An Easy and Ecological Method of Obtaining Hydrated and Non-Crystalline WO3−x for Application in Supercapacitors

et al. 2020

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In this work, we report the synthesis of hydrated and non-crystalline WO3 flakes (WO3−x) via an environmentally friendly and facile water-based strategy. This method is described, in the literature, as exfoliation, however, based on the results obtained, we cannot say unequivocally that we have obtained an exfoliated material. Nevertheless, the proposed modification procedure clearly affects the morphology of WO3 and leads to loss of crystallinity of the material. TEM techniques confirmed that the process leads to the formation of WO3 flakes of a few nanometers in thickness. X-ray diffractograms affirmed the poor crystallinity of the flakes, while spectroscopic methods showed that the materials after exfoliation were abundant with the surface groups. The thin film of hydrated and non-crystalline WO3 exhibits a seven times higher specific capacitance (Cs) in an aqueous electrolyte than bulk WO3 and shows an outstanding long-term cycling stability with a capacitance retention of 92% after 1000 chronopotentiometric cycles in the three-electrode system. In the two-electrode system, hydrated WO3−x shows a Cs of 122 F g−1 at a current density of 0.5 A g−1. The developed supercapacitor shows an energy density of 60 Whkg−1 and power density of 803 Wkg−1 with a decrease of 16% in Csp after 10,000 cycles. On the other hand, WO3−x is characterized by inferior properties as an anode material in lithium-ion batteries compared to bulk WO3. Lithium ions intercalate into a WO3 crystal framework and occupy trigonal cavity sites during the electrochemical polarization. If there is no regular layer structure, as in the case of the hydrated and non-crystalline WO3, the insertion of lithium ions between WO3 layers is not possible. Thus, in the case of a non-aqueous electrolyte, the specific capacity of the hydrated and non-crystalline WO3 electrode material is much lower in comparison with the specific capacity of the bulk WO3-based anode material.

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Section: Non-aqueous Electrolytesupporting

confidence: 76%

An Easy and Ecological Method of Obtaining Hydrated and Non-Crystalline WO3−x for Application in Supercapacitors

et al. 2020

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“…Plane (111) at an angle of 18.38 corresponds to the orthorhombic phase (WO 3 $0.33H 2 O) (JCPDS: 35-0270); the highly intense plane (002) at 24.14 characterizes the hexagonal structure (h-WO 3 ) (JCPDS: 85-2460), and the remaining peaks above 24.14 illustrate the existence of the monoclinic phase. 29,[37][38][39] On further annealing at 400 C, W400 exhibited a pure monoclinic phase with lattice constants a ¼ 7.306, b ¼ 7.540, and c ¼ 7.69 (JCPDS: 01-072-0677). The diffraction peak of W200 along the (111) plane completely vanished and the plane (002) corresponding to the hexagonal plane became a triplet, with the (002), (020) and (200) planes at angles of 23.14 , 23.68 , and 24.37 respectively.…”

Section: Structural and Morphological Investigationsmentioning

confidence: 99%

Phase transformation in tungsten oxide nanoplates as a function of post-annealing temperature and its electrochemical influence on energy storage

et al. 2020

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“…The O 1s spectra (Figure f) were fitted to the three peaks centered at 529.6, 531.7, and 533.6 eV, signifying Mn–O, Mn–O–Mn, and −OH, respectively. The oxygen functional groups with multiple oxidation states of Mn and C attached groups in L2D-MCNF also play a significant role in the wettability in the performance of integrated nanomaterials, enhanced drastically owing to more oxidation states . Especially in the present case layered materials and their heterostructures induce strong intercalation and interfacial electron transfer. , Additionally the surrounding temperature highly affects the electrochemical kinematics.…”

Section: Resultsmentioning

confidence: 84%

Thermally Driven High-Rate Intercalated Pseudocapacitance of Flower-like Architecture of Ultrathin Few Layered δ-MnO₂ Nanosheets on Carbon Nano-Onions

Gupta

Kakade

Sathe

et al. 2020

ACS Appl. Energy Mater.

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The layered two-dimensional (L2D) nanostructures are greatly favorable electrode materials in electrochemical energy storage as a consequence of enhanced specific surface area and effective intercalation of ions. However, the realizations of uniform L2D structure with appropriate van der Waals gap and its threedimensional architecture of a few-layered association enhance the accommodation of ions for superior supercapacitor. Temperature driven boost in the storage by compensating minor life span is highly noteworthy. Herein, we report a fascinating 3D architecture composed of L2D δ-MnO 2 nanosheets decorated on carbon nanoonion (CNO) by a cost-effective, template-free, low-temperature chemical route. The temperature-driven electrochemical kinematics exhibits efficient charge storage capacity via intercalated pseudocapacitance. The specific capacitance was boosted from 147 F•g −1 to 321 F•g −1 with increasing temperature from 4 to 70 °C at 2 mV•s −1 . Nevertheless, merely 25% stability retention has been forfeited up to 6000 cycles at high current density (5 A•g −1 ). Furthermore, the flexible asymmetric device (FAD) demonstrates a high operating voltage of 1.8 V and superior bendability via retention of 97% capacitance with the bending angles from 0°to 180°. The superior energy density of 49.5 Wh kg −1 and excellent stability of 89% up to 10 000 cycles are figures of merit of L2D δ-MnO 2 nanosheets decorated on carbon nano-onion (CNO) electrode candidate for next-generation wearable energy storage devices.

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Enhanced energy density and stability of self-assembled cauliflower of Pd doped monoclinic WO3 nanostructure supercapacitor

Cited by 43 publications

References 36 publications

An Easy and Ecological Method of Obtaining Hydrated and Non-Crystalline WO3−x for Application in Supercapacitors

An Easy and Ecological Method of Obtaining Hydrated and Non-Crystalline WO3−x for Application in Supercapacitors

Phase transformation in tungsten oxide nanoplates as a function of post-annealing temperature and its electrochemical influence on energy storage

Thermally Driven High-Rate Intercalated Pseudocapacitance of Flower-like Architecture of Ultrathin Few Layered δ-MnO₂ Nanosheets on Carbon Nano-Onions

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Enhanced energy density and stability of self-assembled cauliflower of Pd doped monoclinic WO3 nanostructure supercapacitor

Cited by 43 publications

References 36 publications

An Easy and Ecological Method of Obtaining Hydrated and Non-Crystalline WO3−x for Application in Supercapacitors

An Easy and Ecological Method of Obtaining Hydrated and Non-Crystalline WO3−x for Application in Supercapacitors

Phase transformation in tungsten oxide nanoplates as a function of post-annealing temperature and its electrochemical influence on energy storage

Thermally Driven High-Rate Intercalated Pseudocapacitance of Flower-like Architecture of Ultrathin Few Layered δ-MnO2 Nanosheets on Carbon Nano-Onions

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Thermally Driven High-Rate Intercalated Pseudocapacitance of Flower-like Architecture of Ultrathin Few Layered δ-MnO₂ Nanosheets on Carbon Nano-Onions