High performance magnetic pseudocapacitors - Direct correlation between specific capacitance and diffusion coefficients

Chowdhury, Arindrajit; Biswas, Sudipta; Sharma, Vasu; Halder, Joyanti; Dhar, A.; Sundaram, Baranidharan; Dubey, Brajesh Kumar; Burada, P. S.; Chandra, Amreesh

doi:10.1016/j.electacta.2021.139252

Cited by 25 publications

(25 citation statements)

References 53 publications

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“…These results verified that the specific capacitance was enhanced due to the enhanced surface capacitive process provided by the CDs. To confirm these findings, the adsorption equation and diffusion equation (Supporting Information) were used to evaluate the charge transfer process . As shown in Figure b,c, the plot between the scan rate ( v ) and peak current ( i p ) was created while the plot between the square root of scan rate ( v 1/2 ) and peak current ( i p ) was constructed.…”

Section: Resultsmentioning

confidence: 99%

“…To confirm these findings, the adsorption equation and diffusion equation (Supporting Information) were used to evaluate the charge transfer process. 39 As shown in Figure 7b,c, the plot between the scan rate (v) and peak current (i p ) was created while the plot between the square root of scan rate (v 1/2 ) and peak current (i p ) was constructed. It was found that all systems gave high R 2 values, confirming that both surface-and diffusioncontrolled processes governed the charge transfer with a slightly better fit to the surface-controlled process.…”

Section: Analysis Of Charge Transfermentioning

confidence: 99%

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Quasi-Solid, Bio-Renewable Supercapacitors Based on Cassava Peel and Cassava Starch and the Use of Carbon Dots as Performance Enhancers

et al. 2022

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Despite receiving high regard as potential energy storage devices, high-performance supercapacitors that can be produced from bio-renewable sources at low cost are still in need. In this work, a novel fabrication process for cassava-based supercapacitors was described in which carbon dots (CDs) and activated carbon (AC) were prepared from cassava peel and a quasi-solid polymer electrolyte was prepared for the first time from cassava starch (CS). A specific capacitance (C sp) of 138.2 F g–1 was obtained from the AC electrode in the CS/H2SO4 electrolyte, which was much greater than 95.9 F g–1 of the AC electrode in a PVA/H2SO4 solution. The CDs were employed as additives in the electrode and electrolyte. The addition of 10 wt % CDs to the AC electrode in the pristine CS/H2SO4 electrolyte increased the C sp to 239.5 F g–1. When 0.02 wt % CDs were added to the CS/H2SO4 electrolyte, a high specific capacitance of 374.6 F g–1 was obtained. Moreover, the fabricated supercapacitor exhibited an impressive cycling stability of 93.3% after 10,000 cycles and showed good performance in a wide temperature range from −40 to 50 °C. Based on intensive electrochemical analysis using several models, the CDs were demonstrated to improve the C sp and cycling stability by enhancing the surface capacitance and surface-controlled processes. In this work, a novel, simple strategy was demonstrated for fabricating practical, high-performance supercapacitors from cassava at a low cost.

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Section: Resultsmentioning

confidence: 99%

Section: Analysis Of Charge Transfermentioning

confidence: 99%

Quasi-Solid, Bio-Renewable Supercapacitors Based on Cassava Peel and Cassava Starch and the Use of Carbon Dots as Performance Enhancers

et al. 2022

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“…including other bifunctional, hierarchical and exotic Ni–Co–O NPs. 136,137 All these results argued that NiCo 2 O 4 has the upper hand over the other TMOs at least in SC applications. A few of the MTMOs’ electrochemical performances are compared in Table 2.…”

Section: Transition Metal Oxide Spinelsmentioning

confidence: 95%

Nanostructured mixed transition metal oxide spinels for supercapacitor applications

Deka

2023

Dalton Trans.

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“…) , where A, D 0 , and 𝐶 * 0 represent the area of the electrode, the diffusion coefficient, and the concentration of ion at time t = 0. Further, a comparison of Equations ( 9), ( 10), (14), and (15) give the values [25] :…”

Section: Theoretical Interpretation Of the Performance Enhancement In...mentioning

confidence: 99%

Role of porosity and diffusion coefficient in porous electrode used in supercapacitors – Correlating theoretical and experimental studies

Halder

Gowda

et al. 2022

Electrochemical Science Adv

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Porous electrodes are fast emerging as essential components for next‐generation supercapacitors. Using porous structures of Co3O4, Mn3O4, α‐Fe2O3, and carbon, their advantages over the solid counterpart is unequivocally established. The improved performance in porous architecture is linked to the enhanced active specific surface and direct channels leading to improved electrolyte interaction with the redox‐active sites. A theoretical model utilizing Fick's law is proposed, that can consistently explain the experimental data. The porous structures exhibit ∼50%–80% increment in specific capacitance, along with high rate capabilities and excellent cycling stability due to the higher diffusion coefficients.

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High performance magnetic pseudocapacitors - Direct correlation between specific capacitance and diffusion coefficients

Cited by 25 publications

References 53 publications

Quasi-Solid, Bio-Renewable Supercapacitors Based on Cassava Peel and Cassava Starch and the Use of Carbon Dots as Performance Enhancers

Quasi-Solid, Bio-Renewable Supercapacitors Based on Cassava Peel and Cassava Starch and the Use of Carbon Dots as Performance Enhancers

Nanostructured mixed transition metal oxide spinels for supercapacitor applications

Role of porosity and diffusion coefficient in porous electrode used in supercapacitors – Correlating theoretical and experimental studies

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