Pyridinium-based protic ionic liquids as electrolytes for RuO2 electrochemical capacitors

Mayrand-Provencher, Laurence; Lin, Sixian; Lazzerini, Déborah; Rochefort, Dominic

doi:10.1016/j.jpowsour.2010.02.073

Cited by 60 publications

(41 citation statements)

References 31 publications

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“…68,71,72 The physicochemical properties for a series of stoichiometric and nonstoichiometric combinations of heterocyclic amines and TFA have been reported. 73, 74 As a related part of this investigation, it was determined that the colored impurities present in the PILs and protic salts studied did not affect their electrochemical behavior, whereas even small changes in their stoichiometry had a significant effect. 75 The melting points of the PILs cover a broad range, with many liquid at or below room temperature.…”

Section: Physicochemical Characterizationmentioning

confidence: 97%

Protic Ionic Liquids: Evolving Structure–Property Relationships and Expanding Applications

2015

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Section: Physicochemical Characterizationmentioning

confidence: 97%

Protic Ionic Liquids: Evolving Structure–Property Relationships and Expanding Applications

2015

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“…The open‐circuit voltage (OCV) of H 2 fuel cells containing PIL electrolytes can approach the thermodynamic value at elevated temperatures due to a decrease in the ORR overpotential 7. The thermal stability and non‐flammability of many PILs also means that they have been proposed as electrolytes for lithium‐ion batteries8 and capacitors 9…”

Section: Introductionmentioning

confidence: 99%

The Formation and Role of Oxide Layers on Pt during Hydrazine Oxidation in Protic Ionic Liquids

et al. 2013

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The electrochemistry of platinum is studied in the protic ionic liquids dimethylethylammonium trifluoromethanesulfonate, diethylmethylammonium trifluoromethanesulfonate and diethylmethylammonium bis(trifluoromethanesulfonyl)imide. Oxide layers form on platinum due to trace water oxidation in the ionic liquids at potentials of about 1.0 V and the oxide growth kinetics change as the potential increases Above 60 °C, multilayers of oxide form in each ionic liquid at high potentials. The hydrazine oxidation reaction was used as a probe of the reactivity of the oxide layers and significant differences in the behaviour of the [TfO]−‐based ionic liquids and [dema][Tf2N] are observed during hydrazine oxidation. Specifically, significant “activation” of the Pt electrode towards hydrazine oxidation is observed in the [TfO]−‐based liquids whereas the electrode appears to be poisoned rapidly in [dema][Tf2N]. The electrochemically formed oxide layers are sensitive to the presence of hydrazine dissolved in dimethylethylammonium trifluoromethanesulfonate and immersion of the “activated” oxide‐coated Pt in a hydrazine/ionic liquid solution for extended periods of time results in deactivation of the platinum surface.

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“…Although studies on the asymmetric systems and applicability of non-aqueous electrolytes to oxide electrodes in order to widen the operating voltage window have recently been initiated, non-aqueous electrolytes have yet to surpass aqueous electrolytes in terms of specific capacitance. [3][4][5][6][7][8] Electrolytes near neutral pH are selected for materials that are not as corrosion-resistant in acids and base, for example manganese oxide.9-12 Neutral electrolytes are more environmentally benign and its low corrosiveness allows a wider range in choice for periphery material, such as current collectors and packaging.13 Despite the RuO 2 -based material being the model pseudocapacitive material, studies on the electrochemical capacitor behavior in neutral electrolytes are scarce compared to the more popular acidic or basic electrolytes. One of the reasons is that the capacitance of RuO 2 in neutral electrolytes is generally 1/2 of that in sulfuric acid or potassium hydroxide.…”

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confidence: 99%

Towards Implantable Bio-Supercapacitors: Pseudocapacitance of Ruthenium Oxide Nanoparticles and Nanosheets in Acids, Buffered Solutions, and Bioelectrolytes

Makino

Ban

Sugimoto

2015

J. Electrochem. Soc.

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Metal oxides, in particular ruthenium-based oxides, are promising electrode materials for aqueous pseudocapacitors. Strong acids or bases are favored over neutral electrolytes owing to the higher capacitance. Here we explore the pseudocapacitive behavior of ruthenium oxide nanoparticles and nanosheets in near neutral pH as an environmentally benign electrolyte. The pseudocapacitive charge storage in poorly-crystalline hydrous RuO 2 nanoparticles, and highly-crystalline RuO 2 nanosheets were investigated in acetic acid-lithium acetate (AcOH-AcOLi) buffered solutions. It is shown that capacitance values as high as 1,038 F g −1 can be achieved in AcOH-AcOLi buffered solutions with RuO 2 nanosheets, which is 44% higher than the benchmark RuO 2 · nH 2 O in H 2 SO 4 electrolyte (720 F g −1 ). Furthermore, comparable performance was obtained in phosphate buffered saline and fetal bovine serum. The mechanism of the pseudocapacitive properties is discussed based on the difference in the surface redox behavior of different RuO 2 nanomaterials in acid, neutral, buffered solutions, and in weak acid. Electrochemical capacitors (also known as supercapacitors) are energy harvesting devices capable of charge and discharging within a few seconds, and cycle life in the order of thousands of cycles. Some metal-oxides are known to provide high capacitance in aqueous electrolytes, owing to the combination of the non-faradaic electrical double layer charging and the faradaic surface or near surface confined redox capacitance (psuedocapacitance).1 Pseudocapacitance is a phenomenon generally observed in aqueous electrolytes.2 Acidic or basic electrolytes such as H 2 SO 4 and KOH are favorable in terms of power density owing to the high conductivity. RuO 2 is one of the rare oxides that is stable in both acidic and basic conditions. Hydrous RuO 2 nanoparticles (RuO 2 · nH 2 O; where n is typically 0.5) offers capacitance of ∼700 F g −1 in H 2 SO 4 electrolyte and can be cycled for thousands of cycles with practically no decay, thus is often used for performance benchmarking of new electrode materials. Although studies on the asymmetric systems and applicability of non-aqueous electrolytes to oxide electrodes in order to widen the operating voltage window have recently been initiated, non-aqueous electrolytes have yet to surpass aqueous electrolytes in terms of specific capacitance. [3][4][5][6][7][8] Electrolytes near neutral pH are selected for materials that are not as corrosion-resistant in acids and base, for example manganese oxide.9-12 Neutral electrolytes are more environmentally benign and its low corrosiveness allows a wider range in choice for periphery material, such as current collectors and packaging.13 Despite the RuO 2 -based material being the model pseudocapacitive material, studies on the electrochemical capacitor behavior in neutral electrolytes are scarce compared to the more popular acidic or basic electrolytes. One of the reasons is that the capacitance of RuO 2 in neutral electrolytes is generally 1/2 of that in s...

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Pyridinium-based protic ionic liquids as electrolytes for RuO2 electrochemical capacitors

Cited by 60 publications

References 31 publications

Protic Ionic Liquids: Evolving Structure–Property Relationships and Expanding Applications

Protic Ionic Liquids: Evolving Structure–Property Relationships and Expanding Applications

The Formation and Role of Oxide Layers on Pt during Hydrazine Oxidation in Protic Ionic Liquids

Towards Implantable Bio-Supercapacitors: Pseudocapacitance of Ruthenium Oxide Nanoparticles and Nanosheets in Acids, Buffered Solutions, and Bioelectrolytes

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