Carbide-derived carbon aerogels with tunable pore structure as versatile electrode material in high power supercapacitors

Oschatz, Martin; Boukhalfa, Sofiane; Nickel, Winfried; Hofmann, Jan P.; Fischer, Cathleen; Yushin, Gleb; Kaskel, Stefan

doi:10.1016/j.carbon.2016.11.050

Cited by 183 publications

(84 citation statements)

References 41 publications

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“…The phase angle of our devices is close to -90° at the low-frequency region, further indicating an ideal supercapacitor behavior [39]. hemp-derived carbon nanosheets (1.61-2.77 s) [4], carbide-derived carbon aerogel (~5 s) [41] and bamboo-derived beehive-like carbon (1.64 s) [10]. The outcome further confirms that the graphitized cage-like high-aspect-ratio nanosheet structure can provide a short relaxation time for ion transport and be in favor of fast-rate capability [30].…”

Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 58%

Unusual interconnected graphitized carbon nanosheets as the electrode of high-rate ionic liquid-based supercapacitor

Tian

Gao

Tan

et al. 2017

Carbon

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A type of unusual interconnected graphitized carbon nanosheets (GCNS) was fabricated from biomass waste, i.e., inner shaddock skins using a facile combined method of simultaneous carbonization-activation and post-vacuum-annealing processes. The obtained GCNS has an optimized integration of a cage-like high-aspect-ratio nanosheet structure (~8 nm thickness), a large surface area of 2327 m 2 g -1 and hierarchical meso/micropore systems (82.3% mesopore volume).Given the effect of post-vacuum-annealing process, enhanced graphitization degree and excellent electronic conductivity (7.9 S cm -1 ) were obtained for the GCNS. The enhanced graphitization degree not only effectively improves electronic/ionic-transport kinetics in favor of rate capability but also prevents electrolyte degradation thus benefitting cyclic life. The ionic liquid-based supercapacitors assembled with symmetric GCNS electrodes exhibited an ultrahigh rate capability of 87% at current density of 100 A g -1 (holding 132 F g −1 ) and a long cyclic life of 97.6% capacitance retention after 10,000 cycles. The excellent rate capability resulted in an integrated high energy-power property at an energy density of 56 Wh kg -1 (29.2 Wh L -1 ), corresponding to a power density of 93 kW kg -1 (48.4 kW L -1 ).

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Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 58%

Unusual interconnected graphitized carbon nanosheets as the electrode of high-rate ionic liquid-based supercapacitor

Tian

Gao

Tan

et al. 2017

Carbon

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“…CV curves (a, b), the rate performance (c), the IR drops (d) and life span (e) at 10 a/g. Ragone plots (f) of the CNS3 in 1 M TEABF4/PC and pure EMIMBF4 electrolyte, vs. PCN6@ TEABF4/PC‐2.7 V&EMIMBF4‐3.5 V, PCF‐900@EMIMBF4‐3.5 V, NHP − HA/KOH@TEABF4/AN‐2.7 V& EMIMBF4‐3.5 V, PCG@TEABF4/AN‐2.7 V, A1G@TEABF4/AN‐2.7 V, C‐700@TEABF4/AN‐2.7 V, F310‐800@EMIMBF4‐3.5 V, CDC@TEABF4/AN‐2.7 V&EMIBF4‐3.5 V, HPGCS@TEABF4/AN‐2.7 V, N‐rGO@BMIMBF4‐3.5 V, HPC@ [EMIM][TFSI]‐3.5 V, and CMCN‐7@ EMIMBF4‐3.5 V…”

Section: Resultsmentioning

confidence: 99%

Porous carbon nanospheres with moderately oriented domains for EDLC electrode

Xiao

Chang

Zhang

et al. 2019

J Chinese Chemical Soc

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Porous carbon nanospheres with moderately oriented microcrystalline structures were prepared via a relatively simple synthetic route in this article. CTAB acted as a structure‐directing agent to induce small sulfonated pitch (SP) pieces to assemble orderly. By this means, the formation of carbon nanospheres was simultaneous with the moderate orientation of carbon microcrystalline without additional process. Owing to the moderately oriented microcrystalline structures, the resultant sample CNS3 possessed a high e‐conductivity of 62.5 S/m. When used as an electrode material for EDLCs, it showed excellent electrochemical properties even without any conductive agent. In an organic electrolyte, the resultant sample CNS3 possessed a high specific capacitance of 155 F/g at 20 A/g and outstanding cycle life with 94.2% capacity retention after 10,000 cycles. This work puts forward a novel design for carbon nanospheres with moderately oriented domains by a simple and energy‐efficient means.

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“…[22,52,53] However, the rate capability in this less conductive electrolyte was lower for all the materials tested, as can be seen in Figure 7b. [22,[54][55][56][57] Nevertheless, the higher cell voltage of Li 2 SO 4 -based supercapacitors leads to an increase in the amount of energy stored of ca. This is further supported by EIS (Figure 8c), which not only reveals a higher ESR in the neutral electrolyte compared to the acid one, but also a much greater resistance to the diffusion of ions.…”

Section: Electrochemical Properties Of 3d Porous Carbonsmentioning

confidence: 99%

Sustainable Salt Template‐Assisted Chemical Activation for the Production of Porous Carbons with Enhanced Power Handling Ability in Supercapacitors

Díez

Ferrero

Fuertes

et al. 2019

Batteries & Supercaps

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Highly porous materials with a 3D framework have been produced by a sustainable salt template-assisted chemical activation approach based on the use of KCl particles as template, K 2 CO 3 particles as both template and activating agent, and biomass-derivatives as carbon precursor (i. e., glucose and soybean meal). The self-assembly of all the constituents into a 3D structure is achieved by a freeze-drying process. After carbonization and a simple washing step with water, a 3D hierarchical porous carbon is obtained. The sustainability of the process is ensured by using chemicals of low or null toxicity and renewable carbon precursors. The materials produced are characterized by a 3D framework composed of thin walls rich in micropores, with BET surface areas in excess of 2000 m 2 g À 1 and pore volumes of up to 1.4 cm 3 g À 1 . These materials show an improved rate capability in supercapacitors based on aqueous (H 2 SO 4 and Li 2 SO 4 ) and ionic liquid electrolytes (EMImTFSI/AN) with carbon electrode loadings well within the range of commercial values.[a] N.

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Carbide-derived carbon aerogels with tunable pore structure as versatile electrode material in high power supercapacitors

Cited by 183 publications

References 41 publications

Unusual interconnected graphitized carbon nanosheets as the electrode of high-rate ionic liquid-based supercapacitor

Unusual interconnected graphitized carbon nanosheets as the electrode of high-rate ionic liquid-based supercapacitor

Porous carbon nanospheres with moderately oriented domains for EDLC electrode

Sustainable Salt Template‐Assisted Chemical Activation for the Production of Porous Carbons with Enhanced Power Handling Ability in Supercapacitors

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