2D porous carbon nanosheets constructed using few-layer graphene sheets by a “medium-up” strategy for ultrahigh power-output EDLCs

Chang, Panpan; Matsumura, Kazunori; Zhang, Jizong; Qi, Jie; Wang, Chengyang; Kinumoto, Taro; Tsumura, Tomoki; Chen, Mingming; Toyoda, Masahiro

doi:10.1039/c8ta02308e

Cited by 41 publications

(26 citation statements)

References 51 publications

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“…The increasing Warburg resistance could be attributed to the reduced ion diffusivity inside electrodes at relatively low temperatures . The fitted data of Warburg resistance at each temperature is less than 1 Ω, indicating a fast ion diffusion inside the electrode . Moreover, the charge transfer resistance of the GN/VGNS/MnO 2 electrode at RT is smaller than those of MnO 2 ‐based materials, Co 3 O 4 , and Fe 3 O 4 /carbon composite (in the range of 1.9 to 10.7 Ω), which confirms the rapid charge transfer kinetics in the interfacial Faradaic reactions.…”

Section: Resultsmentioning

confidence: 70%

“…[28] The fitted data of Warburg resistance at each temperature is less than 1 Ω, indicating a fast ion diffusion inside the electrode. [51,52] Moreover, the charge transfer resistance of the GN/VGNS/MnO 2 electrode at RT is smaller than those of MnO 2 -based materials, [46,[53][54][55][56] Co 3 O 4 , [24] and Fe 3 O 4 /carbon composite [23] (in the range of 1.9 to 10.7 Ω), which confirms the rapid charge transfer kinetics in the interfacial Faradaic reactions. The synergistic contributions from the hierarchical structure of GN/VGNS/MnO 2 could account for the relatively low resistances, as schematically illustrated in Figure 1a.…”

Section: Temperature Stability Of the Gn/vgns/mno 2 Pseudocapacitormentioning

confidence: 70%

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Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Kong

Xiong

et al. 2019

ChemElectroChem

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The relatively poor performance stability of pseudocapacitors over a wide temperature window (i. e. temperature stability), particularly at low temperatures, hinders their practical applications. Here, well‐aligned hierarchical pseudocapacitive electrodes are fabricated, featuring run‐through channels in a graphene network (GN) as ion‐buffering reservoirs, open inter‐sheet channels between vertical graphene nanosheets (VGNSs) for fast ion transport and MnO2 nanopetals on VGNSs for efficient interfacial pseudocapacitive reactions. With reduced ion diffusion length and charge‐transfer resistance as well as improved ion‐transport rate, the capacitance of pseudocapacitive electrodes decreases from 541 to 490 F g−1 at 1 A g−1 as the temperature drops from 25 to 0 °C, revealing a high capacitance retention of 90.7 %. Furthermore, the specific capacitance of a symmetric device based on the hierarchical electrodes at −30 °C maintains 80.8 % of the room‐temperature capacitance. Such outstanding temperature stability is comparable to the state‐of‐the‐art electric double‐layer capacitors. Importantly, 86.0 % of capacitance is retained after repeated heating and cooling at temperatures ranging from −30 to 60 °C for 5000 cycles. Asymmetric supercapacitors with the hierarchical architecture in the positive electrode exhibit stable performance over a wide temperature range. These results demonstrate the rationality of the electrode design for practical energy storage applications in harsh temperature environments.

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Section: Resultsmentioning

confidence: 70%

Section: Temperature Stability Of the Gn/vgns/mno 2 Pseudocapacitormentioning

confidence: 70%

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Kong

Xiong

et al. 2019

ChemElectroChem

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“…These surface areasa nd pore sizes were higher than those reported from other previous studies of mesoporous carbons. [33][34][35][36][37] The hysteresis loops of the mesoporous carbon samples and the activated mesoporous carbon samples had similar shapes (Figures 5a and c), implying that the pore structures were retained after activation with KOH. The hysteresis loops of those carbon materials were consistent with typical mesoporousm aterials and H 1 -like cylindrical pores.…”

Section: Resultsmentioning

confidence: 89%

Mesoporous Carbons Templated by PEO‐PCL Block Copolymers as Electrode Materials for Supercapacitors

Ahmed

et al. 2019

Chemistry A European J

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In this study,s amples of activated mesoporous carbon are fabricated with pore structures with cylinder and gyroid nanostructures through the templatinge ffect of amphiphilic poly(ethylene oxide-block-caprolactone)( PEO-PCL) and by using specific resol/PEO-PCL weightr atios (e.g., 60:40 for cylinders;5 5:45 for gyroids). After carbonization and KOH activation, the activated mesoporous carbons were tested as electrode materials for electric double-layerc apacitor (EDLC)s upercapacitors. The electrochemical properties were examined by using three-electrode (6 m KOH (aq) as electrolyte) and CR2032c oin-cell (1 m tetraethylammonium tetra-fluoroborate (TEABF 4 )/CN as the electrolyte) systems. The gyroid carbon samples provided specific capacitances higher than those of the cylinder carbon samples in both aqueous and organic systems:1 55 Fg À1 compared with 135 Fg À1 in 6 m KOH (aq) ,a nd 105.6 compared with 96 Fg À1 in 1 m TEABF 4 / MeCN, after 100 charge/discharge cycles. It is suspected that the bi-continuous mesochannels of the gyroid-type activated mesoporousc arbonsp rovided ar elatively higher effective adsorption surfacea rea;i no ther words, the greater surface area for energy storageo riginated from am oderate pore size and an interconnected pore structure.[a] Dr.

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“…SP consists of the polycyclic aromatic hydrocarbons and side chains. Among the side chains, there are aliphatic hydrocarbon and multifarious oxygen‐containing groups such as carboxyl, phenol, carbonyl, and sulfonic acid groups . The abundant oxygen‐containing groups assist SP to disperse uniformly in aqueous solution by ionizing to anions.…”

Section: Resultsmentioning

confidence: 99%

“…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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2D porous carbon nanosheets constructed using few-layer graphene sheets by a “medium-up” strategy for ultrahigh power-output EDLCs

Abstract: 2D porous carbon nanosheets (PCNs) occupy the foreground in the field of electric double-layer capacitors (EDLCs).

Cited by 41 publications

References 51 publications

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Mesoporous Carbons Templated by PEO‐PCL Block Copolymers as Electrode Materials for Supercapacitors

Porous carbon nanospheres with moderately oriented domains for EDLC electrode

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