Simple synthesis of hierarchically structured partially graphitized carbon by emulsion/block-copolymer co-template method for high power supercapacitors

Mun, Yeongdong; Jo, Changshin; Hyeon, Taeghwan; Lee, Jae-Hyuk; Ha, Kwang; Jun, Ki‐Won; Lee, Sang-Hyup; Hong, Seok-Won; Lee, Hyung Ik; Yoon, Seung Soo; Lee, Jun Young

doi:10.1016/j.carbon.2013.07.092

Cited by 92 publications

(52 citation statements)

References 60 publications

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“…R p is the distributed resistance for ion diffusion in the micropores. [6,76] PEA-Zn-700-40 has very low R p value, implying that ion can quickly transport through its wide micropores and exhibits higher capacity performance at fast loading rate than most other reported samples.…”

Section: Resultsmentioning

confidence: 97%

“…R s is the sum of bulk electrolyte resistance in solution and contact resistance between the electrode and the current collector, which are affected by cell configuration. [6,73,74] AC-35 electrode has the smallest Rs value in comparison with other electrodes, which benefits from the short instance between working and counter electrode and the The total resistance (R t ) equals to the sum of ion migration resistance in the bulk solution (R s ), internal contact resistance of the electrode (R ct ) and equivalent distributed pore resistance (R p ). 12 structural advantage.…”

Section: Resultsmentioning

confidence: 99%

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Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

et al. 2016

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A series of nitrogen and oxygen enriched porous carbons are prepared from poly-N-phenylethanolamine (PNPEA) and polyaniline (PANI) conducting polymers through pyrolysis, chemical activation, and oxidation processes. Ar or N 2 -adsorption, FT-IR, and X-ray photoelectron spectroscopy are used to characterize the surface areas, pore volumes, surface chemical compositions, and oxygen and nitrogen content. Mikhail and Brunauer micropore analytical method (MP method) is successfully used to analyze the micropore size distribution of the samples. The electrochemical behaviour of the samples is studied in two-and three-electrode cells. The contribution of pseudocapacitance is confirmed by cyclic voltammetry and galvanostatic tests performed in acidic (H 2 SO 4 ) and basic (KOH) media. The potential drop and the equivalent series resistance value certify that the samples with wide micropore size distribution possess low interface resistances. A sample with a BET surface area of 760 m 2 g -1 , nitrogen content of 3.02 at.%, oxygen content of 16.65 at.%, and a wide micropore size distribution, presents the best performance, reaching a value of 370 F g -1 at 0.5 A g -1 and 248 F g -1 at 30 A g -1 , and maintaining capacitance retention ration of 96% at 1 A g -1 (over 1000 cycles) and 92% at 30 A g -1 (over 10000 cycles), respectively. The results obtained for all the samples agree with correlation among capacitance, functional group, and porosity, which indicates that an appropriate selection of the surface chemistry, a reasonable pore size distribution, and a moderate BET surface area, may be promising to achieve high-rate-performance supercapacitors.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

et al. 2016

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“…Multi-modal porous carbons have been gaining recently a lot of attention as high performance materials for supercapacitors and other fields including batteries, water purification, CO 2 capture, sensors, fuel cells, and hydrogen storage [5,19,20,[29][30][31][32][33][34][35][36][37][38]. A significant effort has been devoted towards developing efficient synthesis approaches for producing hierarchically porous carbons [5,20,29,30,[39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

A combined salt–hard templating approach for synthesis of multi-modal porous carbons used for probing the simultaneous effects of porosity and electrode engineering on EDLC performance

Bhandari

Dua

Estevez

et al. 2015

Carbon

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A B S T R A C TA new approach, based on a combination of salt and hard templating for producing multimodal porous carbons is demonstrated. The hard template, silica nanoparticles, generate mesopores ($22 nm), and in some cases borderline-macropores ($64 nm), resulting in high pore volume ($3.9 cm 3 /g) while the salt template, zinc chloride, generates borderline-mesopores ($2 nm), thus imparting high surface area ($2100 m 2 /g). The versatility of the proposed synthesis technique is demonstrated using: (i) dual salt templates with hard template resulting in magnetic, nanostructured-clay embedded ($27% clay content), high surface area ($1527 m 2 /g) bimodal carbons ($2 and 70 nm pores), (ii) multiple hard templates with salt template resulting in tri-modal carbons ($2, 12 and 28 nm pores), (iii) low temperature (450°C) synthesis of bimodal carbons afforded by the presence of hygroscopic salt template, (iv) easy coupling with physical activation approaches. A selected set of thus synthesized carbons were used to evaluate, for the first time, the simultaneous effects of carbon porosity and pressure applied during electrode fabrication on EDLC performance. Electrode pressing was found to be more favorable for carbons containing hard-templated mesopores ($87% capacitance retention at current density of 40 A/g) as compared to those without ($54% capacitance retention).

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“…[4][5][6] On the other hand, the chargestorage capacity in well-designed carbonaceous materials in SCs has been improved, thereby resulting in enhanced energy density. [7][8][9][10][11][12] With the advancement in their respective field, the LIB-SC hybrid energy-storage systems (denoted as hybrid supercapacitors, HSCs) in aqueous and non-aqueous media have emerged and attracted much attentions in recent years. [13][14][15][16][17] In particular, non-aqueous HSCs deliver high energy density within seconds (fast charging/discharging) and exhibit high cycle stability.…”

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confidence: 99%

Facile Synthesis of Nb₂O₅@Carbon Core–Shell Nanocrystals with Controlled Crystalline Structure for High-Power Anodes in Hybrid Supercapacitors

et al. 2015

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Hybrid supercapacitors (battery-supercapacitor hybrid devices, HSCs) deliver high energy within seconds (excellent rate capability) with stable cyclability. One of the key limitations in developing high-performance HSCs is imbalance in power capability between the sluggish Faradaic lithium-intercalation anode and rapid non-Faradaic capacitive cathode. To solve this problem, we synthesize Nb2O5@carbon core-shell nanocyrstals (Nb2O5@C NCs) as high-power anode materials with controlled crystalline phases (orthorhombic (T) and pseudohexagonal (TT)) via a facile one-pot synthesis method based on a water-in-oil microemulsion system. The synthesis of ideal T-Nb2O5 for fast Li(+) diffusion is simply achieved by controlling the microemulsion parameter (e.g., pH control). The T-Nb2O5@C NCs shows a reversible specific capacity of ∼180 mA h g(-1) at 0.05 A g(-1) (1.1-3.0 V vs Li/Li(+)) with rapid rate capability compared to that of TT-Nb2O5@C and carbon shell-free Nb2O5 NCs, mainly due to synergistic effects of (i) the structural merit of T-Nb2O5 and (ii) the conductive carbon shell for high electron mobility. The highest energy (∼63 W h kg(-1)) and power (16 528 W kg(-1) achieved at ∼5 W h kg(-1)) densities within the voltage range of 1.0-3.5 V of the HSC using T-Nb2O5@C anode and MSP-20 cathode are remarkable.

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Simple synthesis of hierarchically structured partially graphitized carbon by emulsion/block-copolymer co-template method for high power supercapacitors

Cited by 92 publications

References 60 publications

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

A combined salt–hard templating approach for synthesis of multi-modal porous carbons used for probing the simultaneous effects of porosity and electrode engineering on EDLC performance

Facile Synthesis of Nb₂O₅@Carbon Core–Shell Nanocrystals with Controlled Crystalline Structure for High-Power Anodes in Hybrid Supercapacitors

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Simple synthesis of hierarchically structured partially graphitized carbon by emulsion/block-copolymer co-template method for high power supercapacitors

Cited by 92 publications

References 60 publications

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

Functional Groups and Pore Size Distribution Do Matter to Hierarchically Porous Carbons as High-Rate-Performance Supercapacitors

A combined salt–hard templating approach for synthesis of multi-modal porous carbons used for probing the simultaneous effects of porosity and electrode engineering on EDLC performance

Facile Synthesis of Nb2O5@Carbon Core–Shell Nanocrystals with Controlled Crystalline Structure for High-Power Anodes in Hybrid Supercapacitors

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Facile Synthesis of Nb₂O₅@Carbon Core–Shell Nanocrystals with Controlled Crystalline Structure for High-Power Anodes in Hybrid Supercapacitors