Polycationic oxides as potential electrode materials for aqueous-based electrochemical capacitors

Crosnier, Olivier; Goubard‐Bretesché, Nicolas; Buvat, Gaëtan; Athouël, Laurence; Douard, Camille; Lannelongue, Pierre; Favier, Frèdéric; Brousse, Thierry

doi:10.1016/j.coelec.2018.05.005

Cited by 22 publications

(27 citation statements)

References 51 publications

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“…This pseudocapacitive behavior depends mainly on the existence of specific electroactive cations in the electrode materials. Moreover, some other parameters such as the specific surface area, the morphology, and the accessibility of active sites are also important since it remains a surface reaction that occurs at the electrode/electrolyte interface [13].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Cycling Stability of Fe2WO6 Pseudocapacitive Electrode Materials

et al. 2021

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The stability upon cycling of Fe2WO6 used as a negative electrode material for electrochemical capacitors was investigated. The material was synthesized using low temperature conditions for the first time (220 °C). The electrochemical study of Fe2WO6 in a 5 M LiNO3 aqueous electrolyte led to a specific and volumetric capacitance of 38 F g−1 and 240 F cm−3 when cycled at 2 mV·s−1, respectively, associated with a minor capacitance loss after 10,000 cycles. In order to investigate this very good cycling stability, both surface and bulk characterization techniques (such as Transmission Electron Microscopy, Mössbauer spectroscopy, and magnetization measurements) were used. Only a slight disordering of the Fe3+ cations was observed in the structure, explaining the good stability of the Fe2WO6 upon cycling. This study adds another pseudocapacitive material to the short list of compounds that exhibit such a behavior up to now.

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Section: Introductionmentioning

confidence: 99%

Investigating the Cycling Stability of Fe2WO6 Pseudocapacitive Electrode Materials

et al. 2021

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“…As such, new materials are regularly emerging and, most recently, multicationic oxides were proposed as high volumetric capacitance electrode materials for ECs operated in aqueous electrolytes. [ 9 ] The combination of an electroactive element with high density species can lead to attractive volumetric capacitance values without being detrimental to both cycling rate and stability. Iron tungstate (FeWO 4 ) has demonstrated a capacitive‐like electrochemical signature over long‐term cycling operation, [ 10 ] but the involvement of W and Fe cations in the charge/discharge mechanism has not been established yet.…”

Section: Introductionmentioning

confidence: 99%

Unveiling Pseudocapacitive Charge Storage Behavior in FeWO₄ Electrode Material by Operando X‐Ray Absorption Spectroscopy

Goubard‐Bretesché

Crosnier

Douard

et al. 2020

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In nanosized FeWO4 electrode material, both Fe and W metal cations are suspected to be involved in the fast and reversible Faradaic surface reactions giving rise to its pseudocapacitive signature. In order to fully understand the charge storage mechanism, a deeper insight into the involvement of the electroactive cations still has to be provided. The present paper illustrates how operando X‐ray absorption spectroscopy is successfully used to collect data of unprecedented quality allowing to elucidate the complex electrochemical behavior of this multicationic pseudocapacitive material. Moreover, these in‐depth experiments are obtained in real time upon cycling the electrode, which allows investigating the reactions occurring in the material within a realistic timescale, which is compatible with electrochemical capacitors practical operation. Both Fe K‐edge and W L3‐edge measurements point out the involvement of the Fe3+/Fe2+ redox couple in the charge storage while W6+ acts as a spectator cation. The result of this study enables to unambiguously discriminate between the Faradaic and capacitive behavior of FeWO4. Beside these valuable insights toward the full description of the charge storage mechanism in FeWO4, this paper demonstrates the potential of operando X‐ray absorption spectroscopy to enable a better material engineering for new high capacitance pseudocapacitive materials.

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“…Transition metal oxides can be listed as materials of interest for use in ECs applications, but caution should be taken when reporting their electrochemical metrics. Some of them provide enough high conductivity, high specific capacity, and low equivalent series resistance, thus making the construction of ECs with high energy and reasonable power appear to be easy (Ullah et al, 2015;Crosnier et al, 2018). RuO 2 is among the most highly studied TMOs (Nguyen and Rochefort, 2014).…”

Section: Miscellaneous Materialsmentioning

confidence: 99%

Three-Dimensional Architectures in Electrochemical Capacitor Applications – Insights, Opinions, and Perspectives

et al. 2020

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This review focuses on describing the current state-of-the-art research in the synthesis of 3D architectures for electrochemical capacitor applications. The selection is based on both template and non-template strategies. Particular attention has been paid to carbon materials because of their structural interconnection, as they create not only the desired hierarchical porous channels but also ensure high conductivity and mechanical stability. A comprehensive overview of electrode materials is presented here with a detailed discussion of composite solutions, including their advantages and disadvantages. Numerous examples from the literature are presented for individual solutions. The future challenges posed for this type of material are finally summarized.

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Polycationic oxides as potential electrode materials for aqueous-based electrochemical capacitors

Cited by 22 publications

References 51 publications

Investigating the Cycling Stability of Fe2WO6 Pseudocapacitive Electrode Materials

Investigating the Cycling Stability of Fe2WO6 Pseudocapacitive Electrode Materials

Unveiling Pseudocapacitive Charge Storage Behavior in FeWO₄ Electrode Material by Operando X‐Ray Absorption Spectroscopy

Three-Dimensional Architectures in Electrochemical Capacitor Applications – Insights, Opinions, and Perspectives

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Polycationic oxides as potential electrode materials for aqueous-based electrochemical capacitors

Cited by 22 publications

References 51 publications

Investigating the Cycling Stability of Fe2WO6 Pseudocapacitive Electrode Materials

Investigating the Cycling Stability of Fe2WO6 Pseudocapacitive Electrode Materials

Unveiling Pseudocapacitive Charge Storage Behavior in FeWO4 Electrode Material by Operando X‐Ray Absorption Spectroscopy

Three-Dimensional Architectures in Electrochemical Capacitor Applications – Insights, Opinions, and Perspectives

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Unveiling Pseudocapacitive Charge Storage Behavior in FeWO₄ Electrode Material by Operando X‐Ray Absorption Spectroscopy