Electrochemical role of oxygen containing functional groups on activated carbon electrode

Tojo, Tomohiro; Sakurai, Kengo; Muramatsu, Hiroyuki; Hayashi, T.; Yang, Kap Seung; Jung, Yong Chae; Yang, Cheol‐Min; Endo, Morinobu; Kim, Yoong Ahm

doi:10.1039/c4ra10439k

Cited by 18 publications

(18 citation statements)

References 64 publications

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“…Carbon materials with different amounts of oxygen functional groups can achieve more than 30% capacitance increase in aqueous electrolytes. [ 99,101 ] In addition, oxygen functional groups can react with lithium ions (Li + ) and sodium ions (Na + ) in organic electrolytes. [ 105–108 ] Lee et al [ 105 ] fabricated a redox‐active graphene film electrode that displays a high gravimetric and volumetric capacities of 160 mAh g −1 and 91.5 Ah L −1 in a lithium hexafluorophosphate (LiPF 6 )‐based organic electrolyte.…”

Section: Carbon‐based Electrode Materialsmentioning

confidence: 99%

Perspective on High‐Energy Carbon‐Based Supercapacitors

Dou

Park

2020

Energy & Environ Materials

154

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Supercapacitors based on carbon materials have advantages such as high power density, fast charging/discharging capability, and long lifetime stability, playing a vital role in the field of electrochemical energy storage technologies. To further expand the practical applications of carbon-based supercapacitors, their energy density, which is essentially determined by the specific capacitance and operating voltage, should be improved. This review provides fundamental knowledge on achieving high energy density of supercapacitors. We first address the relationship of the features of carbon materials, such as the surface area, pore size distribution, and surface functional groups, with their electrochemical performances, such as the gravimetric and volumetric capacitance, surface pseudocapacitance, and operating voltage. Then, we discuss the properties of electrolytes from nonaqueous and aqueous to hybrid one from the thermodynamic and kinetic aspects, and present their effects on capacitance and operating voltage. Finally, we illustrate different cell design strategies and their basic principles for increasing operating voltage. We also highlight the recent advances related to these fields and provide our insight into high-energy supercapacitors.

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Section: Carbon‐based Electrode Materialsmentioning

confidence: 99%

Perspective on High‐Energy Carbon‐Based Supercapacitors

Dou

Park

2020

Energy & Environ Materials

154

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“…It has been shown in the literature that there are a variety of materials synthesised from heterogeneous biomass precursors [ 1 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 17 , 18 , 19 , 20 , 21 , 32 ]. These carbon materials might exhibit different properties and structures that are in function of the biomass type and initial composition.…”

Section: Biomass Carbon Sources and Composition As Raw Materials Fomentioning

confidence: 99%

“…For the fabrication of the energy storage devices preparation of carbon electrodes, ACs can serve, thereby, either as the sole electrode material (for ion electrosorption via supercapacitors-as a promising electron double-layer capacitive (EDLC) material) or as a tunable substrate to attach heteroatoms (O, N, H, etc.) capable of boosting their electrochemical performances [9,[17][18][19][20][21]. The preparation of ACs can be done by pyrolysis and hydrothermal processes, and their quality and properties are affected by many factors, including the type of precursors, type of pyrolysis, pyrolysis conditions, and type of activation (chemical and or physical) [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…capable of boosting their electrochemical performances [9,[17][18][19][20][21]. The preparation of ACs can be done by pyrolysis and hydrothermal processes, and their quality and properties are affected by many factors, including the type of precursors, type of pyrolysis, pyrolysis conditions, and type of activation (chemical and or physical) [18][19][20][21]. Therefore, more fundamental studies are needed to optimise the properties of the final product (ACs) specifically for their applications as energy storage devices.…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Biomass Activated Carbons as Electrodes for Battery and Supercapacitors—A Mini-Review

et al. 2020

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: Some recent developments in the preparation of biomass carbon electrodes (CEs) using various biomass residues for application in energy storage devices, such as batteries and supercapacitors, are presented in this work. The application of biomass residues as the primary precursor for the production of CEs has been increasing over the last years due to it being a renewable source with comparably low processing cost, providing prerequisites for a process that is economically and technically sustainable. Electrochemical energy storage technology is key to the sustainable development of autonomous and wearable electronic devices. This article highlights the application of various types of biomass in the production of CEs by using different types of pyrolysis and experimental conditions and denotes some possible effects on their final characteristics. An overview is provided on the use of different biomass types for the synthesis of CEs with efficient electrochemical properties for batteries and supercapacitors. This review showed that, from different biomass residues, it is possible to obtain CEs with different electrochemical properties and that they can be successfully applied in high-performance batteries and supercapacitors. As the research and development of producing CEs still faces a gap by linking the type and composition of biomass residues with the carbon electrodes’ electrochemical performances in supercapacitor and battery applications, this work tries to diminish this gap. Physical and chemical characteristics of the CEs, such as porosity, chemical composition, and surface functionalities, are reflected in the electrochemical performances. It is expected that this review not only provides the reader with a good overview of using various biomass residues in the energy storage applications, but also highlights some goals and challenges remaining in the future research and development of this topic.

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“…The functional groups are mainly comprised of carboxyl, phenolic hydroxyl, carbonyl, lactone, quinone, ether, etc. [11], and their chemical structure is shown in Figure 4. As Figs.…”

Section: 5 Boehm Titrationmentioning

confidence: 99%

Microwave regeneration of biological activated carbon

Li²,

Wang³

2017

Journal of Advanced Oxidation Technologies

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Abstract:Spent biological activated carbon (SAC) in a drinking water treatment plant has been regenerated with microwaves, and the regeneration effects were evaluated through iodine values, surface chemistry, surface structure energy and surface morphology by comparison with unused activated carbon (UAC). On this basis, the performance of regenerated activated carbon (RAC) was investigated by methylene blue adsorption and raw water clarification. The results showed that the iodine value of RAC recovered to 98.1 % of that of UAC, and that the BET surface area of RAC (778 m 2 /g) was larger than that of SAC (749 m 2 /g). The pore structure of RAC was more regular than that of UAC, and the removal efficiency of RAC could achieve 90.7 % due to the formation of new micropores. Organic adsorption parameters of RAC fitted the Freundich isotherm better than those of UAC, and the R 2 values for COD Mn (chemical oxygen demand determined by KMnO 4 ), DOC (dissolved organic carbon) and UV 254 (absorbance value of the wastewater containing organic matter at ultraviolet light of 254 nm) were 0.902, 0.921 and 0.940, respectively.

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Electrochemical role of oxygen containing functional groups on activated carbon electrode

Abstract: CO groups at the mouth of micropores increase the energy barrier for ions to enter the pores, resulting in a large decrease in the specific capacitance.

Cited by 18 publications

References 64 publications

Perspective on High‐Energy Carbon‐Based Supercapacitors

Perspective on High‐Energy Carbon‐Based Supercapacitors

Sustainable Biomass Activated Carbons as Electrodes for Battery and Supercapacitors—A Mini-Review

Microwave regeneration of biological activated carbon

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