Effect of ion charges on the electric double layer capacitance of activated carbon in aqueous electrolyte systems

Icaza, Juan C.; Guduru, Ramesh K.

doi:10.1016/j.jpowsour.2016.11.017

Cited by 21 publications

(12 citation statements)

References 40 publications

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“…Alternative ion conductors for high‐performing and long‐lasting polymer electrolytes need to be explored. While several neutral pH liquid electrolytes (e. g. sulfates, nitrates, and acetates solutions) have been studied, very few have been applied into polymer electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Virya

Abella

Grindal

et al. 2019

Batteries & Supercaps

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A highly ionic-conductive and high-performance neutral pH polymer electrolyte comprises of Na 2 SO 4 and polyacrylamide (PAM) was developed for solid electrochemical double-layer capacitors (EDLCs). Na 2 SO 4 was compared with Li 2 SO 4 baseline in liquid electrolyte and exhibited higher ionic conductivity and identical stability window. Na 2 SO 4 À PAM electrolytes were optimized by varying their salt-to-polymer ratio. While all compositions show excellent stability for over 30-day tracking period, an ionic conductivity of ca. 30 mS cm À 1 was attained at 10,000 : 1 molar ratio of Na 2 SO 4 :PAM, among the highest reported for neutral pH polymer electrolytes. Raman spectroscopy verified that the electrolyte maintained well-hydrated ions throughout the 30 days monitoring period. Solid EDLCs were constructed using activated carbon electrodes and Na 2 SO 4 À PAM electrolyte. They exhibited a wide 1.9 V operating window at 50 mV s À 1 CV scan rate, with comparable capacitance to its liquid baseline. The solid EDLCs outperformed many symmetric devices in terms of energy and power densities. They also displayed good rate capability (up to 500 mV s À 1 ) and excellent cycle life (> 8,000 cycles).

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Section: Introductionmentioning

confidence: 99%

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Virya

Abella

Grindal

et al. 2019

Batteries & Supercaps

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“…The majority of activated carbons display a specific capacitance of 100-150 F g À 1 , reaching slightly higher values in certain cases. [11,[33][34][35][36][37] This is of course well connected with the electric double-layer capacitance, reaching a maximum of 50 μF cm À 2 . [11] Considering that the currently available electrolytes display stability up to 3.5 V on activated carbon electrodes, [38] the maximum energy output for a symmetric device does not exceed 60 W h kg À 1 ceteris paribus.…”

Section: Introductionmentioning

confidence: 67%

“…In fact, a high specific surface area results in high specific capacitance values, but one must be aware that the pore distribution must also accommodate the ion dimensions; otherwise, the specific capacitance might be high, but charge propagation will be poor. The majority of activated carbons display a specific capacitance of 100–150 F g −1 , reaching slightly higher values in certain cases . This is of course well connected with the electric double‐layer capacitance, reaching a maximum of 50 μF cm −2 .…”

Section: Introductionmentioning

confidence: 77%

Redox Activity of Bromides in Carbon‐Based Electrochemical Capacitors

Fic

Morimoto

Frąckowiak

et al. 2020

Batteries & Supercaps

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This paper reports on the electrochemical performance of activated carbon electrodes in aqueous solutions of bromidebased species and discusses the results in the broader context of redox-active electrolytes in electrochemical capacitor applications. Operando techniques such as Raman spectroscopy and electrochemical quartz crystal microbalance have been implemented to describe the interactions at the electrode/electrolyte interface. Ex situ experiments, including XPS profiles at different electrode thicknesses, support the discussion by providing insights into surficial and bulk-related processes. Finally, the electrochemical activity of bromides and their advantages and drawbacks are discussed.

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“…Apart from the anion, the cation also plays an important role in determining the electrochemical behavior of carbon materials. Guduru et al . investigated the electrochemical behaviors of activated carbon (AC) based CSCs with LiNO 3 , Mg(NO 3 ) 2 , and Al(NO 3 ) 3 electrolytes.…”

Section: Electrolytes Of Cscsmentioning

confidence: 99%

“…Apart from the anion, the cation also playsa ni mportant role in determining the electrochemical behavior of carbon materials. Guduru et al [31] investigatedt he electrochemical behaviors of activated carbon (AC) based CSCs with LiNO 3 , Mg(NO 3 ) 2 ,a nd Al(NO 3 ) 3 electrolytes. As revealed in Figure 3a, the capacitances of AC electrode in different salt electrolytes underwent the trend :A l(NO 3 ) 3 > Mg(NO 3 ) 2 > LiNO 3 ,n om atter the same molar concentrationo rs ame anion concentration.I n electrolytes with the same salt, the capacitance was observed to firstly increasea nd then decrease along with the increase of concentration.…”

Section: Aqueouselectrolytesmentioning

confidence: 99%

Designing Carbon Based Supercapacitors with High Energy Density: A Summary of Recent Progress

Han

Lai

Wang

et al. 2018

Chemistry A European J

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Carbon based supercapacitors (CSCs), with high output power and long lifespan, are considered as promising power sources for modern electronic devices. The rush to find new approaches for optimizing their electrochemical behaviors is still vibrant, and particularly, widespread enthusiasm was focused on improving the energy density of CSCs through improving the specific capacitance and expanding the operating voltage. In this regard, this article provides a brief review about recent progress and new understanding about the assembly of CSCs with high energy density. Novel applied strategies were highlighted and discussed from the aspects of electrolyte, electrodes, and device modulation. Dynamic and mechanism factors associated with the energy storage process of CSCs are particularly emphasized. Finally, the opportunities and challenges are elaborated in the hope of guiding the promising direction for the design of high-energy CSCs.

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Effect of ion charges on the electric double layer capacitance of activated carbon in aqueous electrolyte systems

Cited by 21 publications

References 40 publications

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Redox Activity of Bromides in Carbon‐Based Electrochemical Capacitors

Designing Carbon Based Supercapacitors with High Energy Density: A Summary of Recent Progress

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Effect of ion charges on the electric double layer capacitance of activated carbon in aqueous electrolyte systems

Cited by 21 publications

References 40 publications

Na2SO4‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Na2SO4‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Redox Activity of Bromides in Carbon‐Based Electrochemical Capacitors

Designing Carbon Based Supercapacitors with High Energy Density: A Summary of Recent Progress

Contact Info

Product

Resources

About

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors