On the rate capability of supercapacitors characterized by a constant-phase element

Scisco, Gibson P.; Orazem, Mark E.; Ziegler, Kirk J.; Jones, K. S.

doi:10.1016/j.jpowsour.2021.230700

Cited by 8 publications

(2 citation statements)

References 45 publications

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“…Here, with α i varying between 0 and 1 as a dimensionless parameter, Q i represents the capacity of the system in the case where α i = 1. It is important to note that the CPE parameter Q i cannot represent capacitance when α i < 1. − …”

Section: Resultsmentioning

confidence: 99%

Ambipolar Heterojunction Sensors: Another Way to Detect Polluting Gases

Ganesh Moorthy,

Ouedraogo,

Bouvet

2024

ACS Sens.

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Gas sensors based on ambipolar materials offer significant advantages in reducing the size of the analytical system and enhancing its efficiency. Here, bilayer heterojunction devices are constructed using different octafluorinated phthalocyanine complexes, with Zn and Co as metal centers, combined with a lutetium bisphthalocyanine complex (LuPc 2 ). Stable p-type behavior is observed for the ZnF 8 Pc/LuPc 2 device under both electron-donating (NH 3 ) and -oxidizing (NO 2 and O 3 ) gaseous species, while the CoF 8 Pc/LuPc 2 device exhibits n-type behavior under reducing gases and p-type behavior under oxidizing gases. The nature of majority of the charge carriers of Co-based devices varies depending on the nature of target gases, displaying an ambipolar behavior. Both heterojunction devices demonstrate stable and observable response toward all three toxic gases in the sub-ppm range. Remarkably, the Co-based device is highly sensitive toward ammonia with a limit of detection (LOD) of 200 ppb, whereas the Znbased device demonstrates exceptional sensitivity toward oxidizing gases, with excellent LOD values of 4.9 and 0.75 ppb toward NO 2 and O 3 , respectively, which makes it one of the most effective organic heterojunction sensors reported so far for oxidizing gases.

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Section: Resultsmentioning

confidence: 99%

Ambipolar Heterojunction Sensors: Another Way to Detect Polluting Gases

Ganesh Moorthy,

Ouedraogo,

Bouvet

2024

ACS Sens.

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“…This circuit component has two features: its magnitude and its dispersion coefficient (N). The latter varies between 0 and 1: for N = 0, the element behaves like a perfect resistor, whilst, for N = 1, it behaves like a perfect capacitor [24]. In this case, N is quite high (N = 0.9), meaning that the magnitude of the CPE (in this case, represented as an admittance) can be roughly correlated with a capacitance.…”

Section: Mc-recoveredmentioning

confidence: 99%

Superior Rate Capability of High Mass Loading Supercapacitors Fabricated with Carbon Recovered from Methane Cracking

Baptista,

Shacklock,

Shaban

et al. 2023

Inorganics

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High mass loading (ca. 30 mg/cm2) electrodes were prepared with carbon recovered from catalytic methane cracking (MC). As-fabricated supercapacitors displayed 74% of capacitance retention from 6 mA/cm2 to 60 mA/cm2 and a Ragone plot’s slope of −7 Wh/kW (compared to 42% and −31 Wh/kW, respectively, for high mass loading devices fabricated with commercial carbon). The high-rate capability of the MC-recovered carbon is attributed to the presence of carbon black and carbon nanotubes produced during the reaction, which likely increased the electronic and ionic conductivity within the electrode. These results suggest that the by-product of this hydrogen generation route might be a suitable active material for supercapacitors.

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