Effect of aqueous electrolytes on h-WO3 nanorods as an electrode material for supercapacitor application

Saini, Sunaina; Chand, Prakash

doi:10.1016/j.cplett.2022.139760

Cited by 34 publications

(3 citation statements)

References 45 publications

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“…They can provide high ion concentration and ionic conductivity, low resistance, environmental benignity, and are inexpensive and easy to post-treat. As a result, aqueous electrolyte EDLCs have also attracted researchers' attention [50][51][52][53][54][55][56][57][58]. However, the development of aqueous EDLCs is significantly hindered by their relatively low energy densities, which are caused by a narrow voltage window.…”

Section: J Stat Mech (2024) 053205mentioning

confidence: 99%

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Tian,

Zhou

2024

J. Stat. Mech.

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We suggest a coarse-grained water model for use in classical density functional theory (cDFT) to describe aqueous inorganic salt solutions that act as working electrolytes in electrical double-layer capacitors (EDLCs) with electrodes comprising two face-to-face doped carbon monolayers. Focus of the cDFT calculations lies on the influence of solvent electrode wettability (SEW) on capacitance and energy storage behaviors, while also considering its interaction with factors like electrolyte bulk concentration, pore size, electrode voltage, and temperature. New phenomena are disclosed theoretically. Remarkably, this study challenges the traditional notion that energy storage is consistently boosted by enhancing the electrode’s ionophobicity. Contrarily, the SEW effect reduces energy storage below the standard aqueous electrochemical window voltage (around 1.2 V) and only enhances the energy storage as the voltage surpasses a certain threshold up to the optimal window voltage (2 V–2.5 V). Furthermore, a non-monotonic SEW effect on energy storage is demonstrated under appropriate conditions, shedding new light on the complex relationship between ionophobicity and energy storage. Moreover, the present coarse-grained water model enables the prediction of the experimentally observed inverse relationship between temperature and capacitance. In contrast, the widely used electrolyte primitive model predicts the existence of a maximum value. The decisive factor for the impact of SEW on capacitance and energy storage is identified as congestion within the electrode pore, while other factors contribute by affecting this congestion. The present research offers valuable insights, highlighting the significance of SEW in the innovative and strategic design of aqueous inorganic EDLC devices.

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Section: J Stat Mech (2024) 053205mentioning

confidence: 99%

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Tian,

Zhou

2024

J. Stat. Mech.

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“…In addition, such a feature is more advantageous in terms of electrochemical properties. Furthermore, WO 3 is efficient and advantageous [ 21 ] and used in lithium‐ion battery applications, thanks to the high theoretical capacity of 700 mAh g −1 . [ 22 ] Even though the outstanding performance of WO 3 , it especially has lower electrical conductivity and slow lithium intercalation and deintercalation cycles.…”

Section: Introductionmentioning

confidence: 99%

“…[23] Remarkable awareness has been attached significance to the nanostructures with enlarged surface area and raised adsorption activity to explore the electrochemical energy storage technologies and reduce drawbacks of WO 3 . These nanoarchitectural approaches possess 0D WO 3 quantum dots [24] and nanoparticles, [25] WO 3 nanorods, [21] nanowires, [26] nanotubes [27] and nanofibers, [28] 2D WO 3 nanosheets [29] and nanoplates, [30] 3D WO 3 nanospheres, [31] nanoflowers, [32] hierarchical, [33,34] and nanoporous. [34] Pseudocapacitors do not require thicker electroactive materials since they store charge primarily in the first few nanometers of the surface.…”

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confidence: 99%

Evaluation of Supercapacitor Properties of Radio Frequency Sputter Binder‐Free and Nanosandwich WO₃/SiO₂/WO₃ Thin Film

2023

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Supercapacitors require efficient and environmentally friendly electrodes. This study investigates the promising potential of a tungsten oxide/silicon dioxide/tungsten oxide (WO3/SiO2/WO3) thin film on a Cu substrate as an alternative to conventional metal oxide flexible electrodes. Motivated by the need for enhanced energy storage capabilities, the WO3/SiO2/WO3 composite combines WO3 high specific capacitance and electrochemical stability of WO3 with improved mechanical durability and high surface area of SiO2, offering a synergistic solution to overcome electrode limitations. Utilizing the Radio Frequency (Rf) Magnetron Sputtering technique, the WO3/SiO2/WO3 thin film is precisely deposited on a Cu flexible substrate without organic additives, conductive agents, binder chemicals, or substrate pre‐treatment. Electrochemical characterization reveals the film’s pseudocapacitive behaviour, facilitated by the SiO2 interlayer, enabling influential adjustment of electrolyte ions within the electrode structure. The obtained high specific capacitances at various scan rates and current densities demonstrate the potential of the thin film for supercapacitor applications. This research highlights the nanosandwich WO3/SiO2/WO3 thin film as a promising material for flexible energy storage and intelligent nanodevices, making it a noteworthy candidate for various flexible applications. The findings contribute to the development of efficient and environmentally friendly energy storage solutions.This article is protected by copyright. All rights reserved.

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Nanostructure Design for Supercapacitor Application

Lokhande

Mane²,

Lokhande³

et al. 2023

Chemically Deposited Metal Chalcogenide-Based Carbon Composites for Versatile Applications

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Effect of aqueous electrolytes on h-WO3 nanorods as an electrode material for supercapacitor application

Cited by 34 publications

References 45 publications

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Evaluation of Supercapacitor Properties of Radio Frequency Sputter Binder‐Free and Nanosandwich WO₃/SiO₂/WO₃ Thin Film

Nanostructure Design for Supercapacitor Application

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Effect of aqueous electrolytes on h-WO3 nanorods as an electrode material for supercapacitor application

Cited by 34 publications

References 45 publications

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Electrode wettability and capacitance of electrical double layer capacitor: a classical density functional theory study

Evaluation of Supercapacitor Properties of Radio Frequency Sputter Binder‐Free and Nanosandwich WO3/SiO2/WO3 Thin Film

Nanostructure Design for Supercapacitor Application

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Evaluation of Supercapacitor Properties of Radio Frequency Sputter Binder‐Free and Nanosandwich WO₃/SiO₂/WO₃ Thin Film