High frequency response of adenine-derived carbon in aqueous electrochemical capacitor

Piwek, Justyna; Ślesiński, Adam; Fic, Krzysztof; Aina, Sergio; Vižintin, Alen; Tratnik, Blaž; Tchernychova, Elena; Lobera, M. Pilar; Bernechea, María; Dominko, Robert; Frąckowiak, Elżbieta

doi:10.1016/j.electacta.2022.140649

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…The presence of two distinct peaks at 1,342 and 1,581 cm -1 may be attributed to the D-and G-band, respectively. These bands were indicative of the disordered carbon and ordered graphite crystalline structures, as supported by previous research [37] . The presence of a wide peak seen at around 2,750 cm -1 was ascribed to the 2D-band, which signified the existence of layered carbon structures [38] .…”

Section: Resultssupporting

confidence: 86%

“…Among all MAC samples, 140MAC24 exhibited the highest graphitization degree (I D /I G = 0.9727), which could be consistent with the superiority of the priority mentioned above. Moreover, this phenomenon implied the great defects of the porous structure and the disordered structure in 140MAC24, which was conducive to providing more contact area for the electrolyte ion transport, increasing the material wettability, and further enhancing the charge storage [37] . In addition, the I D /I G values of MACs prepared under different conditions presented the similar tends to the above BET results.…”

Section: Resultsmentioning

confidence: 99%

“…Then, the diffraction peaks of Fe 3 O 4 , Fe 2 O 3 , and FeO appeared on the spectrum during the charging phases, and their intensities gradually increased with the expanded potential span until 1 V. In this case, iron compounds could function as accelerators for charging by changing into the oxide form (M II O or M III O) and generating faradic capacitance. However, there were few differences between the spectra of the charging potential of 0 and 0.2 V. It indicated a slight degree of redox reaction and little amount of ion transfer [37] , which corresponded to the limited integral area of CV curves ranging from 0 to 0.2 V. In contrast, only the discharging region between 0.2 and 0 V exhibited obvious transformation of CoO diffraction peaks of the XRD spectrum, indicating the promoting effect of cobalt element during discharging. This phenomenon could explain why the CV curve section of discharge process included an arc of redox peak from 0.2 to 0 V and a line from 0 to -1.0 V. Additionally, the difference between diffraction peaks at the initial discharging and final charging phases could provide the evidence to the irreversible reaction of CoFe 2 O 4 NPs.…”

Section: The Electrochemical Function Mechanism Of Cofe 2 Omentioning

confidence: 90%

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CoFe₂O₄ nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor

Qu,

Chen,

Sun

et al. 2024

Chem Synth

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The low performance of electrode materials is the main obstacle limiting the development of the supercapacitor industry, which can be solved by doping cobalt ferrate nanoparticles (NPs) with carbon materials. Herein, the composites of CoFe2O4 based on activated carbon (AC) were successfully prepared using a one-step solvothermal method and subsequently applied in anodes of battery-type asymmetrical supercapacitors. The effect of solvothermal temperature and heating time on the composite characteristic was systematically evaluated. The electrochemical analysis in the three-electrode system revealed that modified activated carbon heated at 140 °C for 24 h (140MAC24) displayed excellent specific capacitance of 571.36 F/g at the current density of 0.2 A/g due to the synergistic effect of the double-layer and faradic capacitance. Moreover, iron and cobalt elements in CoFe2O4 could change into the oxide form to accelerate charge in potential range window of -1.0 to -0.2 V and discharge from -0.2 to 0.2 V, respectively. Meanwhile, the result of assessing economic feasibility suggested the splendid availability of 140MAC24 electrodes. Additionally, the assembled supercapacitor displayed the outstanding specific capacitance of 171.31 F/g in the potential window of 1.8 V, energy density of 43.5 Wh/kg at the current density of 0.2 A/g, and capacitance retention rate of 82.49% after 10,000 cycles. The excellent electrochemical properties demonstrated that CoFe2O4 could be used as a bifunctional agent for enhancing supercapacitive performance.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: The Electrochemical Function Mechanism Of Cofe 2 Omentioning

confidence: 90%

See 1 more Smart Citation

CoFe₂O₄ nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor

Qu,

Chen,

Sun

et al. 2024

Chem Synth

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Effects of physical and chemical activations on the performance of biochar applied in supercapacitors

Hsiao

Gupta²,

Lee³

et al. 2023

Applied Surface Science

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Understanding Sorption of Aqueous Electrolytes in Porous Carbon by NMR Spectroscopy

Lyu,

Märker,

Zhou

et al. 2024

J. Am. Chem. Soc.

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Ion adsorption at solid−water interfaces is crucial for many electrochemical processes involving aqueous electrolytes including energy storage, electrochemical separations, and electrocatalysis. However, the impact of the hydronium (H 3 O + ) and hydroxide (OH − ) ions on the ion adsorption and surface charge distributions remains poorly understood. Many fundamental studies of supercapacitors focus on non-aqueous electrolytes to avoid addressing the role of functional groups and electrolyte pH in altering ion uptake. Achieving microscopic level characterization of interfacial mixed ion adsorption is particularly challenging due to the complex ion dynamics, disordered structures, and hierarchical porosity of the carbon electrodes. This work addresses these challenges starting with pH measurements to quantify the adsorbed H 3 O + concentrations, which reveal the basic nature of the activated carbon YP-50F commonly used in supercapacitors. Solid-state NMR spectroscopy is used to study the uptake of lithium bis-(trifluoromethanesulfonyl)-imide (LiTFSI) aqueous electrolyte in the YP-50F carbon across the full pH range. The NMR data analysis highlights the importance of including the fast ion-exchange processes for accurate quantification of the adsorbed ions. Under acidic conditions, more TFSI − ions are adsorbed in the carbon pores than Li + ions, with charge compensation also occurring via H 3 O + adsorption. Under neutral and basic conditions, when the carbon's surface charge is close to zero, the Li + and TFSI − ions exhibit similar but lower affinities toward the carbon pores. Our experimental approach and evidence of H 3 O + uptake in pores provide a methodology to relate the local structure to the function and performance in a wide range of materials for energy applications and beyond.

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High frequency response of adenine-derived carbon in aqueous electrochemical capacitor

Cited by 4 publications

References 41 publications

CoFe₂O₄ nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor

CoFe₂O₄ nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor

Effects of physical and chemical activations on the performance of biochar applied in supercapacitors

Understanding Sorption of Aqueous Electrolytes in Porous Carbon by NMR Spectroscopy

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High frequency response of adenine-derived carbon in aqueous electrochemical capacitor

Cited by 4 publications

References 41 publications

CoFe2O4 nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor

CoFe2O4 nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor

Effects of physical and chemical activations on the performance of biochar applied in supercapacitors

Understanding Sorption of Aqueous Electrolytes in Porous Carbon by NMR Spectroscopy

Contact Info

Product

Resources

About

CoFe₂O₄ nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor

CoFe₂O₄ nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor