The effects of local graphitization on the charging mechanisms of microporous carbon supercapacitor electrodes

Yin, Huan; Shao, Hui; Daffos, Barbara; Taberna, Pierre‐Louis; Simon, Patrice

doi:10.1016/j.elecom.2022.107258

Cited by 18 publications

(19 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak disappears for the large pore size of 0.9 nm (CDC-1100 °C). 43 As expected, a slower charge accumulation rate was observed with decreasing the carbon pore size (Figure 3b), in agreement with former experimental observation in nonaqueous electrolytes. 37,38 Previous computational works 34,44 also predicted that smaller average pore size results in a slower charging rate at the molecular level.…”

mentioning

confidence: 98%

“…The current peaks related to electrolyte depletion are observed at 2.5 and 8.5 s for CDC-800 °C (0.8 nm) and CDC-600 °C (0.67 nm), respectively, as a result of the small pore size. The peak disappears for the large pore size of 0.9 nm (CDC-1100 °C) . As expected, a slower charge accumulation rate was observed with decreasing the carbon pore size (Figure b), in agreement with former experimental observation in nonaqueous electrolytes. , Previous computational works , also predicted that smaller average pore size results in a slower charging rate at the molecular level.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Understanding Ion Charging Dynamics in Nanoporous Carbons for Electrochemical Double Layer Capacitor Applications

Shao

Taberna

et al. 2023

ACS Energy Lett.

Self Cite

View full text Add to dashboard Cite

The electric double layer (EDL) is one of the key concepts in electrochemistry, and understanding its charging kinetics is of key importance. Significant progress has been made via theoretical methods; however, it is challenging to study the ion dynamics experimentally in porous carbon electrodes under realistic conditions because of fast charge relaxation. In this work, the charging kinetics of porous carbon electrodes with different pore sizes in an aqueous electrolyte was experimentally investigated in electrolytes with various concentrations by using a cavity microelectrode. We were able to observe electrolyte depletion, and we systematically studied the key parameters that will affect the electrolyte depletion, resulting in major changes in the charging kinetics. Results showed that low concentration, high overpotential, and small carbon pore size triggered the electrolyte depletion, decreasing the charging kinetics. These findings further push our understanding of the ion dynamics of the EDL at the charged porous carbon/electrolyte interface.

show abstract

mentioning

confidence: 98%

mentioning

confidence: 99%

Understanding Ion Charging Dynamics in Nanoporous Carbons for Electrochemical Double Layer Capacitor Applications

Shao

Taberna

et al. 2023

ACS Energy Lett.

Self Cite

View full text Add to dashboard Cite

show abstract

“…S1). The C P curves show a butter y shape that is usually visible for organic systems, [26,35] and fest repolarization processes are shown in the box-like shape. The geometric capacitance (C G ) share is signi cantly lower for capacitive systems, i.e., LiNO 3 (Fig.…”

Section: Point Of Zero Charge Determinationmentioning

confidence: 82%

“…For CV, 1 mV s − 1 was applied, and for SPECS, E = 10 mV with t = 10 s, providing an average scan rate of 1 mV s − 1 . The PZC is determined as the lowest capacitance (current) value [35] in the intermediate potential range (directly correlated with the capacitance (C CV ) calculated from CV technique based on Eq. S2).…”

Section: Point Of Zero Charge Determinationmentioning

confidence: 99%

Fundamentals and implication of PZC determination for activated carbons in aqueous electrolytes

Fic

Galek

et al. 2023

Preprint

View full text Add to dashboard Cite

The point of zero charge (PZC) is crucial for investigating molecular level charging mechanisms in energy storage systems, as demonstrated in electrochemical capacitors. Three electrochemical techniques were studied: cyclic voltammetry (CV), staircase potentio electrochemical impedance spectroscopy (SPEIS) and step potential electrochemical spectroscopy (SPECS) for two activated carbons (ACs) with 0.1 mol L− 1 aqueous solutions of LiNO3, Li2SO4, and KI. The porous AC charging process in aqueous electrolytes is a complex phenomenon; the ion mixing zone covered a wide potential region. Inadequate PZC determination could lead to obscure data evaluation, which could further provide a misguided mechanism description at the molecular level. In the aqueous solutions studied, the adsorption of specific ions and active participation of all ionic species in the electrical double-layer formation were considered. The SPECS technique was determined to be the most beneficial for the PZC determination in electrochemical quartz crystal microbalance applications.

show abstract

“…54 The work showed the significant effects of electrode-electrolyte interaction. Yin et al 57 further test carbon material with a more complex three-dimensional porous structure, demonstrating that the local structure of carbon has an important influence on the charging mechanism. 57…”

Section: Ion Transport In Supercapacitorsmentioning

confidence: 99%

Understanding the charging of supercapacitors by electrochemical quartz crystal microbalance

Niu

Yang

et al. 2023

Ind. Chem. Mater.

View full text Add to dashboard Cite

show abstract

The effects of local graphitization on the charging mechanisms of microporous carbon supercapacitor electrodes

Cited by 18 publications

References 34 publications

Understanding Ion Charging Dynamics in Nanoporous Carbons for Electrochemical Double Layer Capacitor Applications

Understanding Ion Charging Dynamics in Nanoporous Carbons for Electrochemical Double Layer Capacitor Applications

Fundamentals and implication of PZC determination for activated carbons in aqueous electrolytes

Understanding the charging of supercapacitors by electrochemical quartz crystal microbalance

Contact Info

Product

Resources

About