Substitutional doping of WO3 for Ca-ion based supercapacitor

Lokhande, Vaibhav C.; Hussain, Tanveer; Shelke, A.R.; Lokhande, A.C.; Ji, Taeksoo

doi:10.1016/j.cej.2021.130557

Cited by 37 publications

(10 citation statements)

References 53 publications

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“…62 With introduction of oxygen vacancies, the semicircle arc of R-TiO 2 /WO 3 /CF was apparently shorter than that of TiO 2 /WO 3 /CF, which indicated a lower R ct value for R-TiO 2 /WO 3 /CF. The slope of impedance at low frequencies was related to the diffusion of ions to the electrode, where the resistance experienced by ions during the diffusion process was W. 63 Thus, the R-TiO 2 /WO 3 /CF with low R ct and W could exhibit excellent electrochemical performance. The fitted parameters of EIS spectra for R-TiO 2 /WO 3 /CF and TiO 2 /WO 3 /CF curves are listed in Table S2.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy Engineering of TiO₂/WO₃ Composites on a Carbon Fiber as Advanced Electrodes for High-Performance Flexible Supercapacitors

Huang

Zhang

Dong

et al. 2023

ACS Appl. Energy Mater.

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Flexible fiber-based supercapacitors (SCs) are promising energy supply systems for portable and wearable electronics. In this work, we reported the in situ growth of reduced hybrid metal oxides (R-TiO2/WO3) with oxygen vacancies on a carbon fiber (CF) for flexible symmetric SCs. It was found that the synergistic effect of the TiO2/WO3 heterojunction and oxygen vacancy engineering could significantly reduce the work function, which accelerated charge transmission at the electrode/electrolyte interface, thereby dramatically enhancing the electrochemical performance. The R-TiO2/WO3/CF electrode exhibited a higher capacitance of 102 F g–1 and a prominent long-term stability of about 97.64%. The R-TiO2/WO3/CF-SC exhibited an attractive energy density of 61.2 Wh kg–1 at a power density of 2160 W kg–1. Moreover, we assembled an all-solid-state flexible SC (R-TiO2/WO3/CF-AFSC) by employing a gel electrolyte, and it could exhibit satisfying long-term stability and maintained favorable flexibility. The facile assembly, favorable flexibility, and remarkable electrochemical performance enabled the R-TiO2/WO3/CF composite systems with rich oxygen vacancies to demonstrate enormous potential for the next-generation intelligent energy supply systems.

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Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy Engineering of TiO₂/WO₃ Composites on a Carbon Fiber as Advanced Electrodes for High-Performance Flexible Supercapacitors

Huang

Zhang

Dong

et al. 2023

ACS Appl. Energy Mater.

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“…The proton is much smaller than lithium and sodium ions. It has less steric hindrance and induces lower stress during the intercalation process, exhibiting faster kinetic characteristics and more significant electrochromic performance. , …”

Section: Resultsmentioning

confidence: 99%

“…It has less steric hindrance and induces lower stress during the intercalation process, exhibiting faster kinetic characteristics and more significant electrochromic performance. 39,40 The a-WO 3 ECE is the key component of ECD that functions electrochromically. However, to balance the charge gain/loss during the coloring/bleaching process, the MoS x CCE has to effectively convert the TMTU/TMFDS RC.…”

Section: Electrochemical Behavior Of Different Guest Ions and Cce/ece...mentioning

confidence: 99%

Proton and Redox Couple Synergized Strategy for Aqueous Low Voltage-Driven WO₃ Electrochromic Devices

Xie

Wang

Khalifa

et al. 2023

ACS Appl. Mater. Interfaces

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Aqueous electrolytes possess non-combustible and eco-friendly features compared to organic electrolytes, leading them to be more suitable for application in smart windows for daily use. However, limited by the narrow electrochemical window of water (1.23 V), its use in conventional electrochromic devices (ECDs) would result in irreversible performance loss, which arises from decomposition caused by high voltage. Here, we propose a synergistic scheme combining a redox couple-catalytic counter electrode (RC-CCE) strategy with protons as guest ions. With the help of the intelligent matching of the reaction potentials of the RC and amorphous WO 3 electrochromic electrodes and the highly active and fast kinetic features of protons, it successfully reduces the working voltage range of the device to 1.1 V. The assembled HClO 4 -ECD can possess an overall modulation rate (350−1200 nm) of 0.43 and 0.94 at −0.1 and −0.7 V, respectively, and a modulation of 66.8% at 600 nm at −0.7 V. Moreover, compared with other guest ions, the proton-based ECD exhibits higher coloration efficiency, a broader color modulation capability, and better stability. In addition, the house model equipped with the proton-based ECD effectively blocks solar radiation, which provides a potential solution for the design of aqueous smart windows.

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“…Metal oxides are considered to be the most favorable materials for the fabrication of high-quality pseudocapacitor electrodes. Some common transition metal oxides include ZnO, [13,14] NiO, [15,16] CuO, [17,18] MnO 2 , [19,20] WO 3 , [21,22] etc. Metal oxides have attracted the extensive attention of researchers due to their high theoretical specific capacitance, unique morphology, large specific surface area, multiple electron transport pathways, and more active sites.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electrolyte Concentration on Electrochemical Performance of ZnWO₄ Nanosheets Array

Liu

et al. 2022

Energy Tech

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At present, supercapacitors have become efficient electrochemical energy storage devices. Electrode materials and electrolyte concentration are important factors affecting the electrochemical performance of supercapacitors. Among the transition metal oxide electrode materials, ZnWO4 has become a promising electrode material for supercapacitors due to its excellent electrochemical performance, but it is still limited by its low energy density. Therefore, the design and development of electrode materials with special structures and the exploration of appropriate electrolyte concentrations have important practical significance for improving the electrochemical performance of ZnWO4‐based supercapacitors. Herein, ZnWO4 nanomaterials with a nanosheets array structure are prepared by a hydrothermal method, and the effect of different KOH electrolyte concentrations on their electrochemical properties is explored for the first time. It is found that when KOH is 6 M, ZnWO4 nanosheets array has the highest specific capacitance (660.72 F g−1 at 1 A g−1) and energy density of 99.93 Wh g−1 (ΔV:0–0.55 V). In this article, the influence of different electrolyte concentrations on the electrochemical properties is revealed and the mechanism is clarified, which provides a reference for the further development of ZnWO4 nanomaterials.

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Substitutional doping of WO3 for Ca-ion based supercapacitor

Cited by 37 publications

References 53 publications

Oxygen Vacancy Engineering of TiO₂/WO₃ Composites on a Carbon Fiber as Advanced Electrodes for High-Performance Flexible Supercapacitors

Oxygen Vacancy Engineering of TiO₂/WO₃ Composites on a Carbon Fiber as Advanced Electrodes for High-Performance Flexible Supercapacitors

Proton and Redox Couple Synergized Strategy for Aqueous Low Voltage-Driven WO₃ Electrochromic Devices

Effect of Electrolyte Concentration on Electrochemical Performance of ZnWO₄ Nanosheets Array

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Substitutional doping of WO3 for Ca-ion based supercapacitor

Cited by 37 publications

References 53 publications

Oxygen Vacancy Engineering of TiO2/WO3 Composites on a Carbon Fiber as Advanced Electrodes for High-Performance Flexible Supercapacitors

Oxygen Vacancy Engineering of TiO2/WO3 Composites on a Carbon Fiber as Advanced Electrodes for High-Performance Flexible Supercapacitors

Proton and Redox Couple Synergized Strategy for Aqueous Low Voltage-Driven WO3 Electrochromic Devices

Effect of Electrolyte Concentration on Electrochemical Performance of ZnWO4 Nanosheets Array

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Resources

About

Oxygen Vacancy Engineering of TiO₂/WO₃ Composites on a Carbon Fiber as Advanced Electrodes for High-Performance Flexible Supercapacitors

Oxygen Vacancy Engineering of TiO₂/WO₃ Composites on a Carbon Fiber as Advanced Electrodes for High-Performance Flexible Supercapacitors

Proton and Redox Couple Synergized Strategy for Aqueous Low Voltage-Driven WO₃ Electrochromic Devices

Effect of Electrolyte Concentration on Electrochemical Performance of ZnWO₄ Nanosheets Array