Studies on preparation and applications of polymeric precursor-based activated hard carbons: I. Activation mechanism and microstructure analyses

Baek, Ji Eun; Lee, Hyemin; Roh, Jae-Seung; Lee, Haeseong; Kang, Hong Seok; Kim, Byung-Joo

doi:10.1016/j.micromeso.2015.07.003

Cited by 48 publications

(33 citation statements)

References 34 publications

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“…The activation temperature depends on the type of activating agents, for example, 400-500 °C for H 3 PO 4 and 500-700 °C for ZnCl 2 [20]. The use of chemicals results in risks of equipment corrosion and secondary environmental pollution during disposal [21,22], and these factors have led to a greater number of studies on physical activation that occurs through oxidation with an oxidizing gas (CO 2 or water vapor). However, physical activation always takes place at higher temperatures (800-1000 °C), leading to a huge consumption of energy [21,23].…”

Section: Introductionmentioning

confidence: 99%

“…The use of chemicals results in risks of equipment corrosion and secondary environmental pollution during disposal [21,22], and these factors have led to a greater number of studies on physical activation that occurs through oxidation with an oxidizing gas (CO 2 or water vapor). However, physical activation always takes place at higher temperatures (800-1000 °C), leading to a huge consumption of energy [21,23]. Thus, exploring a new way to carry out physical activation at lower temperatures for shorter periods of time will be a desirable feature in the field of activated carbon industry.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of micro-mesoporous carbon from seawater-impregnated sawdust by low temperature one-step CO2 activation for adsorption of oxytetracycline

Gao

et al. 2020

SN Appl. Sci.

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Porous carbons (PCs) were prepared from seawater (SW)-impregnated sawdust (SD) by CO 2 activation at 700 °C. The preparation process was investigated on-line by thermogravimetric analyzer coupled with FTIR (TG-FTIR). PCs were characterized by N 2-adsorption/desorption and Fourier transform infrared spectroscopy. The adsorption abilities of PCs for oxytetracycline (OTC) were compared and the adsorption isotherms of OTC on the optimum sample were studied. Results showed that SW impregnation led to the release of more CO from SD at 700 °C, indicating a higher degree of CO 2 activation, thus a 81% higher BET surface area (S BET) can be achieved under the same activation condition. Mesopore volume of PC increased from 0.089 to 0.301 cm 3 g −1 with the activation time increasing from 5 to 60 min. PC obtained after 60-min activation with a S BET of 490 m 2 g −1 and an average pore diameter of 3.78 nm had the highest adsorption ability for OTC. Its adsorption equilibrium data for OTC followed Langmuir model with a maximum monolayer adsorption capacity up to 100 mg g −1 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of micro-mesoporous carbon from seawater-impregnated sawdust by low temperature one-step CO2 activation for adsorption of oxytetracycline

Gao

et al. 2020

SN Appl. Sci.

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“…In previous papers, activated polymer‐based hard carbons (APHCs) were observed using scanning electron microscopy and X‐ray diffraction. The CO 2 activation of the APHC was conducted up to 900°C.…”

Section: Introductionmentioning

confidence: 99%

Correlation studies between pore structure and electrochemical performance of activated polymer-based hard carbon with various organic and aqueous electrolytes

Baek

Chung

et al. 2017

Int J Energy Res

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Summary In this study, activated polymer‐based hard carbon (APHC) was first prepared using CO2 activation. Then electrochemical measurements of APHC‐applied electrodes were used to evaluate these electrodes for application to electric double‐layer capacitors. The APHCs were prepared under different conditions of activation temperature and time. The APHCs that were activated at 1000°C for 40 and 50 minutes showed good textural properties (specific surface area: 2440 and 2210 m2/g, mesopore fraction: 43.5% and 63.1%, respectively). These properties were observed using the N2/77 K adsorption isotherm, and APHCs have favorable pore structures for ion adsorption in electrolytes. Electrochemical techniques such as galvanostatic charge/discharge, cyclic voltammetry, and electrochemical impedance spectroscopy were used to assess the capacitive behaviors and rate performance of the APHCs in various electrolytes. The specific capacitance of the APHCs showed different results depending on the electrolytes used. APHC‐10‐50 showed 117 F/g of specific capacitance in propylene carbonate (PC), but only 106 F/g in acetonitrile (AcN), very different from APHC‐10‐40 (77 F/g in PC and 120 F/g in AcN). Although APHC‐10‐50 had a smaller specific surface area than that of APHC‐10‐40, it exhibited a high mesopore fraction with pore size optimal for PC electrolyte, which has larger ions and clusters than AcN does. This can lead to a relatively higher specific capacitance of APHC‐10‐50 in PC electrolyte than that of APHC‐10‐40 due to the high mesopore fraction.

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“…Other authors report similar XRD proles for carbon materials obtained with the same activating agent. 16,28 The wider the reection is and greater the shi to lower angle, the greater the degree of disorder, 29 (see FWHM in the Table S1 †). The reection of the (002) plane in the sample CH-KOH is very weak, broad and it is displaced towards lower angles, which indicates more space between layers.…”

Section: Introductionmentioning

confidence: 99%

Capacitive behavior of activated carbons obtained from coffee husk

et al. 2020

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Studies on preparation and applications of polymeric precursor-based activated hard carbons: I. Activation mechanism and microstructure analyses

Cited by 48 publications

References 34 publications

Preparation of micro-mesoporous carbon from seawater-impregnated sawdust by low temperature one-step CO2 activation for adsorption of oxytetracycline

Preparation of micro-mesoporous carbon from seawater-impregnated sawdust by low temperature one-step CO2 activation for adsorption of oxytetracycline

Correlation studies between pore structure and electrochemical performance of activated polymer-based hard carbon with various organic and aqueous electrolytes

Capacitive behavior of activated carbons obtained from coffee husk

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