Specific carbon/iodide interactions in electrochemical capacitors monitored by EQCM technique

Płatek-Mielczarek, Anetta; Frąckowiak, Elżbieta; Fic, Krzysztof

doi:10.1039/d0ee03867a

Cited by 29 publications

(15 citation statements)

References 83 publications

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“…The electrochemical quartz crystal microbalance (EQCM) is a relatively inexpensive and nondestructive characterization method, which can provide in situ information on the mass change and reflect the evolution of the structure both in the bulk and at the surface of electrodes. ,− The in situ EQCM was employed to clarify the charge storage mechanism of RbPC in 1 mol L –1 Zn(CF 3 SO 3 ) 2 electrolyte. First, RbPC was coated onto the quartz resonator and used as the working electrode (Scheme S1; for details, see the experimental section in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

High Energy and Power Zinc Ion Capacitors: A Dual-Ion Adsorption and Reversible Chemical Adsorption Coupling Mechanism

et al. 2022

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Zinc ion capacitors (ZICs) hold great promise in large-scale energy storage by inheriting the superiorities of zinc ion batteries and supercapacitors. However, the mismatch of kinetics and capacity between a Zn anode and a capacitive-type cathode is still the Achilles' heel of this technology. Herein, porous carbons are fabricated by using tetra-alkali metal pyromellitic acid salts as precursors through a carbonization/ self-activation procedure for enhancing zinc ion storage. The optimized rubidium-activated porous carbon (RbPC) is verified to hold immense surface area, suitable porosity structure, massive lattice defects, and luxuriant oxygen functional groups. These structural and compositional merits endow RbPC with the promoted zinc ion storage capability and more matchable kinetics and capacity with a Zn anode. Consequently, RbPC-based ZIC delivers a high specific energy of 178.2 W h kg −1 and a peak power density of 72.3 kW kg −1 . A systematic ex situ characterization analysis coupled with in situ electrochemical quartz crystal microbalance tests reveal that the preeminent zinc ion storage properties are ascribed to the synergistic effect of the dual-ion adsorption and reversible chemical adsorption of RbPC. This work provides an efficient strategy to the rational design and construction of high-performance electrodes for ZICs and furthers the fundamental understanding of their charge storage mechanisms or extends the understanding toward other electrochemical energy storage devices.

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Section: Resultsmentioning

confidence: 99%

High Energy and Power Zinc Ion Capacitors: A Dual-Ion Adsorption and Reversible Chemical Adsorption Coupling Mechanism

et al. 2022

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“…[27] This phenomenon was also reported especially on porous structures and matrixes with carbon addictive. [45,46] Therefore, to further rule out the water insertion in bulk MoO 3 in the aqueous Zn 2+ /H + electrolyte, we cycled the MoO 3 electrode (dried at 160 °C overnight under vacuum) with an anhydrous proton electrolyte (HTFSI acid in an ionic liquid, water content < 300 ppm) in an Ar filled glovebox. As expected, identical CV curves were obtained with those in aqueous Zn 2+ /H + electrolyte with similar capacity, which excluded the possibility of both water intercalation and Zn 2+ intercalation (Figure S15, Supporting Information).…”

Section: Moo 3 Host-lattice Response To Anhydrous Proton Intercalationmentioning

confidence: 99%

Anhydrous Fast Proton Transport Boosted by the Hydrogen Bond Network in a Dense Oxide‐Ion Array of α‐MoO₃

Shi

Nishimura

et al. 2022

Advanced Materials

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Developing high‐power battery chemistry is an urgent task to buffer fluctuating renewable energies and achieve a sustainable and flexible power supply. Owing to the small size of the proton and its ultrahigh mobility in water via the Grotthuss mechanism, aqueous proton batteries are an attractive candidate for high‐power energy storage devices. Grotthuss proton transfer is ultrafast owing to the hydrogen‐bonded networks of water molecules. In this work, similar continuous hydrogen bond networks in a dense oxide‐ion array of solid α‐MoO3 are discovered, which facilitate the anhydrous proton transport even without structural water. The fast proton transfer and accumulation that occurs during (de)intercalation in α‐MoO3 is unveiled using both experiments and first‐principles calculations. Coupled with a zinc anode and a superconcentrated Zn2+/H+ electrolyte, the proton‐transport mechanism in anhydrous hydrogen‐bonded networks realizes an aqueous MoO3–Zn battery with large capacity, long life, and fast charge–discharge abilities.

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“…Electrochemical quartz crystal microbalance (EQCM) was further employed to in situ monitor the mass evolution of 0.1Mo-V 2 O 3 and V 2 O 3 anodes during the continuous redox reactions. 25 In principle, the mass change of anodes should come from the Li-ion adsorption on the surface and Li-ion intercalation in the bulk, which is in direct proportion to the frequency change (Δ f ) of EQCM. Fig.…”

Section: Resultsmentioning

confidence: 99%

Engineering V₂O₃ nanoarrays with abundant localized defects towards high-voltage aqueous supercapacitors

Chen

et al. 2022

J. Mater. Chem. A

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Specific carbon/iodide interactions in electrochemical capacitors monitored by EQCM technique

Abstract: This paper reports on the ion fluxes at the interfaces of various porous carbon electrodes/aqueous solutions of alkali metal cations (Na+, K+ and Rb+) and iodide anions, monitored by an electrochemical quartz crystal microbalance (EQCM).

Cited by 29 publications

References 83 publications

High Energy and Power Zinc Ion Capacitors: A Dual-Ion Adsorption and Reversible Chemical Adsorption Coupling Mechanism

High Energy and Power Zinc Ion Capacitors: A Dual-Ion Adsorption and Reversible Chemical Adsorption Coupling Mechanism

Anhydrous Fast Proton Transport Boosted by the Hydrogen Bond Network in a Dense Oxide‐Ion Array of α‐MoO₃

Engineering V₂O₃ nanoarrays with abundant localized defects towards high-voltage aqueous supercapacitors

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Specific carbon/iodide interactions in electrochemical capacitors monitored by EQCM technique

Abstract: This paper reports on the ion fluxes at the interfaces of various porous carbon electrodes/aqueous solutions of alkali metal cations (Na+, K+ and Rb+) and iodide anions, monitored by an electrochemical quartz crystal microbalance (EQCM).

Cited by 29 publications

References 83 publications

High Energy and Power Zinc Ion Capacitors: A Dual-Ion Adsorption and Reversible Chemical Adsorption Coupling Mechanism

High Energy and Power Zinc Ion Capacitors: A Dual-Ion Adsorption and Reversible Chemical Adsorption Coupling Mechanism

Anhydrous Fast Proton Transport Boosted by the Hydrogen Bond Network in a Dense Oxide‐Ion Array of α‐MoO3

Engineering V2O3 nanoarrays with abundant localized defects towards high-voltage aqueous supercapacitors

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Product

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Anhydrous Fast Proton Transport Boosted by the Hydrogen Bond Network in a Dense Oxide‐Ion Array of α‐MoO₃

Engineering V₂O₃ nanoarrays with abundant localized defects towards high-voltage aqueous supercapacitors