Porous carbon electrode for Li-air battery fabricated from solvent expansion during supercritical drying

Kunanusont, Nattanai; Shimoyama, Yusuke

doi:10.1016/j.supflu.2017.09.030

Cited by 13 publications

(16 citation statements)

References 25 publications

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“…e weight ratio of carbon black, PVDF and NMP were varied to understand the e ect of the solvent amount on aerogel structure. One gram of black slurry was placed on a petri dish, and dried using supercritical carbon dioxide at 40°C and 20 MPa for 6 h using supercritical drying apparatus (Kunanusont and Shimoyama, 2018). For temperature parameter investigation, drying was conducted at 40°C, 60°C and 80°C.…”

Section: Aerogel Fabricationmentioning

confidence: 99%

“…Electrical conductivity was determined by the four-point probe method (Smits, 1958;Kunanusont and Shimoyama, 2018) and sheet conductivity was calculated by the following equation.…”

Section: Characterizationmentioning

confidence: 99%

“…en, the research into fabrication of highly porous carbon electrodes using supercritical drying was reported to be successful (Kunanusont and Shimoyama, 2018). Fabricating electrodes using supercritical drying improves electrode porosity because pores collapse due to the phase interface and capillary stress that normally occur in evaporative drying do not happen in supercritical drying, and without this pore collapse, a highly porous electrode can be obtained.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Nanofiber Aerogel Fabricated by Supercritical Drying and Application in Li–O2/CO2 Battery

Sakinah

Kunanusont

Shimoyama

2021

J. Chem. Eng. Japan / JCEJ

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The present study investigates porous carbon black aerogels fabricated with polyvinylidene uoride (PVDF) as binder and N-methylpyrrolidone (NMP) as solvent and dispersant, and dried by supercritical drying using CO 2 at 20 MPa and 40°C, which resulted in greater porosity and thickness than aerogels prepared by evaporative drying. Increasing the ratio of solvent in carbon black slurry increased the porosity and thickness and decreased electrical conductivity. The electrical conductivity of aerogels prepared at 60°C is higher than aerogels prepared at 40°C. However, aerogels prepared at 80°C are broken because evaporative drying occurred simultaneously, whereby the conductivity reduced. Porous carbon nano ber aerogel made by supercritical drying using CO 2 at 20 MPa and 40°C had porosity as high as carbon black aerogel. However, its electrical conductivity is less than carbon black aerogel because of the net-like structure which has less touch points between the bers compared to carbon black particles which gather together and have more touch points between the particles. A coin cell consisting of porous carbon nano ber aerogel or electrode, lithium and electrolyte was connected with oxygen and carbon dioxide at the ratio of 1 : 1. Regardless of its low electrical conductivity, the carbon nano ber electrode showed superior electrical capacity. It also withstood 10 cycles, whereas the carbon black electrode could not withstand 10 cycles.

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Section: Aerogel Fabricationmentioning

confidence: 99%

“…Electrical conductivity was determined by the four-point probe method (Smits, 1958;Kunanusont and Shimoyama, 2018) and sheet conductivity was calculated by the following equation.…”

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon Nanofiber Aerogel Fabricated by Supercritical Drying and Application in Li–O2/CO2 Battery

Sakinah

Kunanusont

Shimoyama

2021

J. Chem. Eng. Japan / JCEJ

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“…Different applications were found in catalysis, working both as a catalyst (carbocatalysis [ 13 ]) and as supporting material during the catalytic electrochemical reactions (e.g., Oxygen Reduction Reaction (ORR) [ 14 , 15 ], Carbon Dioxide Reduction Reaction (CO 2 RR) [ 16 ]). Furthermore, high conductivity carbonaceous materials have been investigated for energy storage applications using carbon as electrodes in systems such as super-capacitors, fuel cells, or rechargeable batteries (Li-ion [ 17 ], Na-ion [ 18 ], Li-S [ 19 ], and Li-air [ 20 ]).…”

Section: Introductionmentioning

confidence: 99%

Mesoporous Carbons from Polysaccharides and Their Use in Li-O2 Batteries

et al. 2020

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Previous studies have demonstrated that the mesoporosity of carbon material obtained by the Starbon® process from starch-formed by amylose and amylopectin can be tuned by controlling this ratio (the higher the amylose, the higher the mesoporosity). This study shows that starch type can also be an important parameter to control this mesoporosity. Carbons with controlled mesoporosity (Vmeso from 0.1–0.7 cm3/g) have been produced by the pre-mixing of different starches using an ionic liquid (IL) followed by a modified Starbon® process. The results show that the use of starch from corn and maize (commercially available Hylon VII with maize, respectively) is the better combination to increase the mesopore volume. Moreover, “low-cost” mesoporous carbons have been obtained by the direct carbonization of the pre-treated starch mixtures with the IL. In all cases, the IL can be recovered and reused, as demonstrated by its recycling up to three times. Furthermore, and as a comparison, chitosan has been also used as a precursor to obtain N-doped mesoporous carbons (5.5 wt% N) with moderate mesoporosity (Vmeso = 0.43 cm3/g). The different mesoporous carbons have been tested as cathode components in Li-O2 batteries and it is shown that a higher carbon mesoporosity, produced from starch precursor, or the N-doping, produced from chitosan precursor, increase the final battery cell performance (specific capacity and cycling).

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“…Although soil, plants, oceans, and rivers in the natural carbon cycle can all absorb CO 2 , there is an urgent need to develop effective and sustainable techniques to reduce and reuse CO 2 in other applications. 1,2 Supercritical CO 2 , for example, can be applied in many potential applications such as fabrication process of porous materials, 2,3 drug delivery systems, 4−7 and nanosuspensions. 8,9 Carbon dioxide can be used for switching polarity, hydrophilicity, or ionic strength of a solvent.…”

Section: Introductionmentioning

confidence: 99%

CO₂-Activated Adsorption: A New Approach to Dye Removal by Chitosan Hydrogel

et al. 2018

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This study focuses on development of a new adsorption technique by CO 2 -activated chitosan. Carbon dioxide was utilized to form the functional chemical groups of chitosan on the adsorptions of anionic dyes, Brilliant Blue FCF and Congo Red, in the aqueous solution. CO 2 -activated chitosan results in the dye adsorption significantly faster than that of chitosan in pure water. The adsorption capacities and removal efficiencies of the dye are increased by CO 2 -activated chitosan. Furthermore, the dye adsorptions on CO 2 -activated chitosan were investigated at various temperatures and initial dye concentrations in the aqueous solution. Interestingly, the high temperature adsorption provides the enhancement of adsorption capacities and removal efficiencies of the dye by the carbamate cross-linking of chitosan with CO 2 . CO 2 -activated chitosan was further characterized by Fourier transform infrared spectra, amino group ratio, zeta potential, and thermal gravimetric analysis. These characterizations can be used for understanding the unique adsorption of the dye on CO 2 -activated chitosan. Carbon dioxide-activated chitosan in this work will provide an effective operation and a clean process of dye adsorption in wastewater treatment.

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Porous carbon electrode for Li-air battery fabricated from solvent expansion during supercritical drying

Cited by 13 publications

References 25 publications

Carbon Nanofiber Aerogel Fabricated by Supercritical Drying and Application in Li–O<sub>2</sub>/CO<sub>2</sub> Battery

Carbon Nanofiber Aerogel Fabricated by Supercritical Drying and Application in Li–O<sub>2</sub>/CO<sub>2</sub> Battery

Mesoporous Carbons from Polysaccharides and Their Use in Li-O2 Batteries

CO₂-Activated Adsorption: A New Approach to Dye Removal by Chitosan Hydrogel

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Porous carbon electrode for Li-air battery fabricated from solvent expansion during supercritical drying

Cited by 13 publications

References 25 publications

Carbon Nanofiber Aerogel Fabricated by Supercritical Drying and Application in Li–O<sub>2</sub>/CO<sub>2</sub> Battery

Carbon Nanofiber Aerogel Fabricated by Supercritical Drying and Application in Li–O<sub>2</sub>/CO<sub>2</sub> Battery

Mesoporous Carbons from Polysaccharides and Their Use in Li-O2 Batteries

CO2-Activated Adsorption: A New Approach to Dye Removal by Chitosan Hydrogel

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Product

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CO₂-Activated Adsorption: A New Approach to Dye Removal by Chitosan Hydrogel