Redox active electrolytes in carbon/carbon electrochemical capacitors

Górska, Barbara; Frąckowiak, Elżbieta; Béguin, François

doi:10.1016/j.coelec.2018.05.006

Cited by 57 publications

(35 citation statements)

References 55 publications

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“…[372][373][374][375][376][377][378] During these two years, some new strategies are proposed, for example, applying redox additive electrolytes for hybrid supercapacitors or choosing suitable supporting electrolytes. 379 However, because of their high diffusivity of ions in aqueous electrolytes, the self-discharge remains a great issue. 380 A new concept proposed by Rochefort's 381 and Fontaine's group 382 uses a biredox ionic liquid as salt in an electrolyte to achieve bulk-like redox density with liquid-like fast kinetics.…”

Section: Advanced Electrolytesmentioning

confidence: 99%

Nanoporous carbon for electrochemical capacitive energy storage

et al. 2020

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Section: Advanced Electrolytesmentioning

confidence: 99%

Nanoporous carbon for electrochemical capacitive energy storage

et al. 2020

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“…Among the various hybrid ECs using redox-active aqueous electrolytes, the iodide-based one is probably the most suitable owing to the redox potential being very close to the equilibrium potential of the cell [25], which drives the battery-like positive electrode to work at a constant potential, while the negative electrode stores charge mainly in the electric double-layer (EDL). So far, hybrid ECs using either potassium iodide (KI) [14,26,27], Li 2 SO 4 + KI [15], MnSO 4 + KI [22] or choline nitrate + choline iodide-based electrolytes [24] have been proposed, and in all these systems, the potential of the positive electrode is nearly constant, while the negative electrode works in a large potential range using more than 90% of the cell potential window.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Polyiodide Redox Species in Porous Carbon for Battery-Like Electrodes in Eco-Friendly Hybrid Electrochemical Capacitors

Abbas

Fitzek

Schröttner³

et al. 2019

Nanomaterials

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Hybrid electrochemical capacitors have emerged as attractive energy storage option, which perfectly fill the gap between electric double-layer capacitors (EDLCs) and batteries, combining in one device the high power of the former and the high energy of the latter. We show that the charging characteristics of the positive carbon electrode are transformed to behave like a battery operating at nearly constant potential after it is polarized in aqueous iodide electrolyte (1 mol L−1 NaI). Thermogravimetric analysis of the positive carbon electrode confirms the decomposition of iodides trapped inside the carbon pores in a wide temperature range from 190 C to 425 C, while Raman spectra of the positive electrode show characteristic peaks of I3− and I5− at 110 and 160 cm−1, respectively. After entrapment of polyiodides in the carbon pores by polarization in 1 mol L−1 NaI, the positive electrode retains the battery-like behavior in another cell, where it is coupled with a carbon-based negative electrode in aqueous NaNO3 electrolyte without any redox species. This new cell (the iodide-ion capacitor) demonstrates the charging characteristics of a hybrid capacitor with capacitance values comparable to the one using 1 mol L−1 NaI. The constant capacitance profile of the new hybrid cell in aqueous NaNO3 for 5000 galvanostatic charge/discharge cycles at 0.5 A g−1 shows that iodide species are confined to the positive battery-like electrode exhibiting negligible potential decay during self-discharge tests, and their shuttling to the negative electrode is prevented in this system.

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“…The principle of supercapacitor is a quick charge accumulation and release process in the interface of electrode-electrolyte, open Scientific RepoRtS | (2020) 10:3518 | https://doi.org/10.1038/s41598-020-60625-ywww.nature.com/scientificreports www.nature.com/scientificreports/ where the characters of electrode materials are decisive to the resultant electrochemistry performances 9,29 . Among various electrode materials, porous carbons have been the most promising candidates for supercapacitor application 30,31 . The ideal porous carbons should have large specific surface area for charge storage, hierarchical pores (micro-, meso-and macro-pores) for fast ion transport/diffusion and good wettability for promoting the pore access to electrolyte ions.…”

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High yield conversion of biowaste coffee grounds into hierarchical porous carbon for superior capacitive energy storage

Liu

Zhang

Wen

et al. 2020

Sci Rep

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Recently great efforts have been focused on converting biowastes into high-valued carbon materials.However, it is still a great challenge to achieve high carbon yield and controllable porous distribution in both industrial and academic research. Inspired by the multi-void structure of waste coffee grounds, herein we fabricated hierarchical porous carbon via the combination of catalytic carbonization and alkali activation. The catalytic carbonization process was applied to obtain well-defined mesoporous carbon with carbon yield as high as 42.5 wt%, and subsequent alkali activation process produced hierarchical porous carbon with ultrahigh specific surface area (3549 m 2 g −1 ) and large meso-/macropores volume (1.64 cm 3 g −1 ). In three-electrode system, the electrode exhibited a high capacitance of 440 F g −1 at 0.5 A g −1 in 6 M KOH aqueous electrolyte, superior to that of many reported biomass-derived porous carbons. In two-electrode system, its energy density reached to 101 Wh kg −1 at the power density of 900 W kg −1 in 1-Ethyl-3-Methylimidazolium Tetrafluoroborate (EMIMBF 4 ). This work provided a cost-effective strategy to recycle biowastes into hierarchical porous carbon with high yield for highperformance energy storage application.In recent years, with the purpose of turning waste into treasure and reducing environmental hazard, waste management for the production of high-valuable carbon materials has received considerable attention 1 . Specially, biowastes are viewed as the most outstanding natural carbon precursors by virtue of their rich source, low-cost and sustainability 2-4 . So far, many biowastes have been recycled to synthesize carbon materials, but their applications are still limited by low carbon yield and unsatisfied pore structure 5-7 . Thus, effective methods are necessary to control carbonization process and optimize pore distribution for meeting the demands of various intended applications.Until now, several strategies have been developed for the fabrication of porous carbons, including hydrothermal carbonization 8 , hard template 9 and molten-salt route 10 , etc. Generally the widely used carbon-rich precursors are polymers 11 , metal-organic frameworks 12 , organic complex 13 and carbohydrates 14 . Meanwhile, natural biomass is also widely used as carbon precursors, such as salvia splendens 15 , clover stems 16 , moringa oleifera branches 17 , ginkgo leaves 18 , and pollens 19 . Moreover, with considering environmental protection and resource recycle, biowastes are viewed as more promising natural carbon precursors 20 . Currently, various biowastes from plants or animals have been used for porous carbons production, such as kraft lignin 21 , soybean residue 22 , dairy manure 23 , bagasse wastes 24 and peanut shell 1 . In many cases, the added catalysts (or activators) are difficult to penetrate into the inside of carbon precursors, resulting in low carbon yield and unmanageable pore distribution 25 . Besides, many kinds of biowastes are difficult to collect or have a low production. I...

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Redox active electrolytes in carbon/carbon electrochemical capacitors

Cited by 57 publications

References 55 publications

Nanoporous carbon for electrochemical capacitive energy storage

Nanoporous carbon for electrochemical capacitive energy storage

Immobilization of Polyiodide Redox Species in Porous Carbon for Battery-Like Electrodes in Eco-Friendly Hybrid Electrochemical Capacitors

High yield conversion of biowaste coffee grounds into hierarchical porous carbon for superior capacitive energy storage

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