An investigation of nanostructured thin film α-MoO3 based supercapacitor electrodes in an aqueous electrolyte

Mendoza-Sánchez, Beatriz; Brousse, Thierry; Ramirez-Castro, Claudia; Nicolosi, Valeria; Grant, Patrick S.

doi:10.1016/j.electacta.2012.11.127

Cited by 195 publications

(84 citation statements)

References 56 publications

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“…8,68 In alkaline electrolytes, this effect was hardly observed. 71 3.1.1.3. However, the cycle-lives of pseudocapacitaors are normally shorter than that of EDLCs because of the degradation of electrode functional materials in the presence of aqueous electrolytes.…”

Section: Aqueous Electrolytesmentioning

confidence: 99%

A review of electrolyte materials and compositions for electrochemical supercapacitors

et al. 2015

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Electrolytes have been identified as some of the most influential components in the performance of electrochemical supercapacitors (ESs), which include: electrical double-layer capacitors, pseudocapacitors and hybrid supercapacitors. This paper reviews recent progress in the research and development of ES electrolytes. The electrolytes are classified into several categories, including: aqueous, organic, ionic liquids, solid-state or quasi-solid-state, as well as redox-active electrolytes. Effects of electrolyte properties on ES performance are discussed in detail. The principles and methods of designing and optimizing electrolytes for ES performance and application are highlighted through a comprehensive analysis of the literature. Interaction among the electrolytes, electro-active materials and inactive components (current collectors, binders, and separators) is discussed. The challenges in producing high-performing electrolytes are analyzed. Several possible research directions to overcome these challenges are proposed for future efforts, with the main aim of improving ESs' energy density without sacrificing existing advantages (e.g., a high power density and a long cycle-life) (507 references).

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Section: Aqueous Electrolytesmentioning

confidence: 99%

A review of electrolyte materials and compositions for electrochemical supercapacitors

et al. 2015

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“…In this regard, organic electrolytes are good candidates compared to aqueous electrolytes because they are not limited by a narrow voltage window of 1.23 V and, depending on the choice of materials, they can operate in a voltage window of up to 2.7 V . However, organic solvents suffer from performance degradation, especially when operating at high voltages (Δ V >2.5 V).…”

Section: Introductionmentioning

confidence: 99%

Gas Evolution in Activated‐Carbon‐Based Supercapacitors with Protic Deep Eutectic Solvent as Electrolyte

2017

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One of the primary causes of aging in supercapacitors are the irreversible faradaic reactions occurring near the operating-voltage limit that lead to the production of gases resulting in device swelling, increased resistance, and lowering of the capacitance. In this study, a protic deep eutectic solvent (DES) consisting of mixture of lithium bis(fluorosulfonyl)imide (LiFSI) with formamide (FMD) as H-bond donor (x =0.25; C=2.5 m LiFSI) is investigated as electrolyte for activated carbon (AC)-based electrical double layer capacitors (EDLCs). Characterization of the viscosity, conductivity, and the ionicity of the electrolyte in a wide range of temperatures indicates >88 % salt dissociation. In situ pressure measurements are performed to understand the effect of cycling conditions on the rate of gas generation, quantified by the in operando pressure variation dP/dt. These measurements demonstrate that about 25 % of the faradaic reactions leading to gas generation are electrochemically reversible. Cell aging studies demonstrate promising potential of the LiFSI/FMD as a protic electrolyte for AC-based EDLCs and high energy density close to 30 Wh kg at 2.4 V.

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“…This is particularly interesting, as ion exchange methods that have proven successful for other layered oxides, cannot be applied to MoO3. The ability to exfoliate this material is important, as nano-structured MoO3 is expected to be a valuable component in a number of applications including electrodes in supercapacitors [50][51][52] and Li ion batteries. [53][54][55][56][57] Equally important, successful exfoliation would demonstrate that these techniques can be extended beyond familiar materials such as graphene, BN and TMDs.…”

Section: Introductionmentioning

confidence: 99%

Production of Molybdenum Trioxide Nanosheets by Liquid Exfoliation and Their Application in High-Performance Supercapacitors

et al. 2014

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ABSTRACT:Here we demonstrate a simple method to exfoliate layered molybdenum trioxide (MoO3) crystallites to give multi-layer MoO3 nanosheets dispersed in solvents. Exfoliation is achieved by sonicating MoO3 powder in the presence of suitable solvents followed by centrifugation to remove undispersed material. This procedure works well in a range of solvents with Hildebrand solubility parameters close to 21 MPa 1/2 , and is consistent with the predictions of classical solubility theory. We have fully optimised this process and demonstrated methods to separate the resultant nanosheets by size. Raman spectroscopy suggests the exfoliation process does not damage the MoO3. This is supported by measurements which show reaggregated nanosheets to display very similar photoluminescence to bulk MoO3. However, the dispersed nanosheets had distinctly different photoluminescence indicating a decoupling of the monolayers on exfoliation. We have used liquid exfoliated MoO3 to prepare supercapacitor electrodes which had relatively low capacitance (~2 F/g at 10 mV/s), due to the low electrical conductivity of the MoO3.However, addition of carbon nanotubes beyond the percolation threshold yielded a 100-fold increase in capacitance. Some MoO3/nanotube composites displayed capacitances as high as 540 F/g at 0.1 mV/s. This is the first example of solvent exfoliation of a layered metal oxide.We believe this work opens the way to liquid exfoliation of a wide range of layered compounds leading to an array of new solution processed 2D materials.

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An investigation of nanostructured thin film α-MoO3 based supercapacitor electrodes in an aqueous electrolyte

Cited by 195 publications

References 56 publications

A review of electrolyte materials and compositions for electrochemical supercapacitors

A review of electrolyte materials and compositions for electrochemical supercapacitors

Gas Evolution in Activated‐Carbon‐Based Supercapacitors with Protic Deep Eutectic Solvent as Electrolyte

Production of Molybdenum Trioxide Nanosheets by Liquid Exfoliation and Their Application in High-Performance Supercapacitors

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