Improvement in the surface properties of activated carbon via steam pretreatment for high performance supercapacitors

Li, Zhenyu; Akhtar, M. Shaheer; Kwak, Do-Hwan; Yang, O‐Bong

doi:10.1016/j.apsusc.2017.01.238

Cited by 43 publications

(15 citation statements)

References 31 publications

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“…In electrical-double layer capacitors (EDLC) different carbon materials are used for preparing the hierarchically micromesoporous electrodes. [1][2][3][4][5][6] The use of activated carbon electrodes in EDLC-s is taking advantages of its micro-mesoporous structure to reduce the electrode's electrical resistance and improve energy storage performance. 1 Organic and waste materials are quite often being used to prepare cost-effective carbon materials, but carbide-derived carbons (CDC) have an unique nanoporous structure with a narrow pore size distribution, a possibility to fine-tune the pore size and volume and also they have high electric conductivity.…”

mentioning

confidence: 99%

Steam and Carbon Dioxide Co-Activated Silicon Carbide-Derived Carbons for High Power Density Electrical Double Layer Capacitors

Tee

Tallo

Thomberg

et al. 2018

J. Electrochem. Soc.

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Different mico-mesoporous silicon carbide-derived carbons (SiC-CDC) were synthesized via gas phase chlorination at 1100 • C and thereafter activated at 900 • C and 1000 • C with H 2 O steam using Ar and CO 2 as the carrier gases. The physical characterization data show that these materials are mainly amorphous, the structure does not change remarkably during the activation process and the surface chemistry of the differently activated and treated materials remains the same and there are no functional groups at the SiC-CDC surface. N 2 , Ar and CO 2 sorption measurements indicate an increase in the specific surface area and pore size distribution with increasing the activation temperature, whereas the influence of the carrier gas during synthesis is minimal. Although the specific surface areas and pore size distributions differed, the electrochemical parameters in 1 M (C 2 H 5 ) 3 CH 3 NBF 4 acetonitrile solution for all SiC-CDC materials were similar -specific gravimetric capacitances 130 ± 18 F g −1 and volumetric capacitance 67 ± 14 F cm Activated carbon materials are widely studied for several energy storage applications. In electrical-double layer capacitors (EDLC) different carbon materials are used for preparing the hierarchically micromesoporous electrodes.1-6 The use of activated carbon electrodes in EDLC-s is taking advantages of its micro-mesoporous structure to reduce the electrode's electrical resistance and improve energy storage performance.1 Organic and waste materials are quite often being used to prepare cost-effective carbon materials, but carbide-derived carbons (CDC) have an unique nanoporous structure with a narrow pore size distribution, a possibility to fine-tune the pore size and volume and also they have high electric conductivity.1,6-9 These properties make the CDC materials especially promising for energy storage/power generation applications. 2,4,8 To improve the carbon materials specific surface area and average pore size they are often activated by gas phase or liquid phase activation. Since gas phase activation enables cleaner production it is more favorable than liquid phase chemical activation.9,10 Carbon dioxide and H 2 O steam are the most widespread activating agents due to the cost-efficiency and endothermic nature of their reactions which allows better process control. 1Previously we have shown that gas phase activation with CO 2 of silicon carbide-derived carbon (SiC-CDC) resulted in doubling of the Brunauer-Emmett-Teller (BET) specific surface area and noticeable increase in pore size.12 Due to that the electrochemical parameters where significantly enhanced.12,13 Román et al. have reported that while CO 2 produces narrow micropores on the carbons and widens them as activation time is increased, steam yields pores of all the sizes from the early stages of the process and results in wider pore size distribution and more obvious development of macropores in the carbon materials.9,11 Steam activation has been widely used before for different activated carbons, but it is not m...

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mentioning

confidence: 99%

Steam and Carbon Dioxide Co-Activated Silicon Carbide-Derived Carbons for High Power Density Electrical Double Layer Capacitors

Tee

Tallo

Thomberg

et al. 2018

J. Electrochem. Soc.

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“…Activated carbon has been widely used as an electrode material for supercapacitors because of its high porosity. In most cases, activated carbon is used as powder or fiber particle form [45][46][47]. In this case, the commercial fabric VF was carbonized and activated into ACVF with high porosity, and then was directly used as two electrodes to form an electrostatic type (Helmholtz Layer only) supercapacitor.…”

Section: Structure and Electrochemical Performance Of Supercapacitorsmentioning

confidence: 99%

All-fabric flexible supercapacitor for energy storage

Luo

Chen

2018

Journal of Industrial Textiles

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An all-fabric solid-state flexible supercapacitor has been fabricated using three types of commercial woven fabrics made of carbon fiber, activated carbon fiber, and polyester fiber, respectively. The activated carbon fiber fabric is viscose-based twill through carbonization and activation, followed by a deposition of CeO2 or ZnO nanoparticles through a hydrothermal process. The resultant fabric supercapacitor displays a high specific capacitance of 13.24 mF cm−2 at a scan rate of 0.2 mV s−1, an excellent capacitance retention of 87.6% at 5000 charge/discharge cycles, and a high energy density of 4.6 × 10−7 Wh cm−2 at a power density of 3.31 × 10−6 W cm−2. The supercapacitor is capable of bending in any angles without losing its performance, revealing an excellent flexibility. The facile, cost-effective fabrication process and excellent electrochemical performance allow this all-fabric solid-state flexible supercapacitor to be potentially used in new generation of wearable and self-powered electronic devices.

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“…Li et al used air thermal oxidation activation (973 K) to pretreat AC, and the results showed that the specic surface area and pore volume of activated AC increased. 13 In recent years, activated AC-loaded precious metal nanoparticles, such as Pt, Pd, Ru and Au, have been identied as ideal catalysts for NO + CO model reactions and CO reduction. [14][15][16][17] However, the high price, resource scarcity and low heat stability of precious metals limit their wide application as supported precious metal catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al used air thermal oxidation activation (973 K) to pretreat AC, and the results showed that the specific surface area and pore volume of activated AC increased. 13 …”

Section: Introductionmentioning

confidence: 99%

Influence of cerium doping on Cu–Ni/activated carbon low-temperature CO-SCR denitration catalysts

et al. 2021

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Improvement in the surface properties of activated carbon via steam pretreatment for high performance supercapacitors

Cited by 43 publications

References 31 publications

Steam and Carbon Dioxide Co-Activated Silicon Carbide-Derived Carbons for High Power Density Electrical Double Layer Capacitors

Steam and Carbon Dioxide Co-Activated Silicon Carbide-Derived Carbons for High Power Density Electrical Double Layer Capacitors

All-fabric flexible supercapacitor for energy storage

Influence of cerium doping on Cu–Ni/activated carbon low-temperature CO-SCR denitration catalysts

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