Aus Carbiden abgeleitete Kohlenstoffmonolithe mit hierarchischer Porenarchitektur

Oschatz, Martin; Borchardt, Lars; Thommes, Matthias; Cychosz, Katie A.; Senkovska, Irena; Klein, Nicole; Frind, Robert; Leistner, Matthias; Presser, Volker; Gogotsi, Yury; Kaskel, Stefan

doi:10.1002/ange.201200024

Cited by 16 publications

(10 citation statements)

References 39 publications

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“…Recently,i tw as found that materials havingh ierarchicalporosity exhibit intriguingproperties such as improved mass transport andm inimized diffusion barriers. [23][24][25][26] As far as POPs are concerned, the introductiono fh ierarchical porosity still faces ag reat challenge due to the very limiteds trategies to combine differentlevels of porosity in one POP. [20][21][22] However,s of ar most porous materials with hierarchical porosity are derived from inorganics.…”

Section: Introductionmentioning

confidence: 99%

Precision Construction of 2D Heteropore Covalent Organic Frameworks by a Multiple‐Linking‐Site Strategy

Qian

Jiang

et al. 2016

Chemistry A European J

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Integrating different kinds of pores into one covalent organic framework (COF) endows it with hierarchical porosity and thus generates a member of a new class of COFs, namely, heteropore COFs. Whereas the construction of COFs with homoporosity has already been well developed, the fabrication of heteropore COFs still faces great challenges. Although two strategies have recently been developed to successfully construct heteropore COFs from noncyclic building blocks, they suffer from the generation of COF isomers, which decreases the predictability and controllability of construction of this type of reticular materials. In this work, this drawback was overcome by a multiple-linking-site strategy that offers precision construction of heteropore COFs containing two kinds of hexagonal pores with different shapes and sizes. This strategy was developed by designing a building block in which double linking sites are introduced at each branch of a C -symmetric skeleton, the most widely used scaffold to construct COFs with homogeneous porosity. This design provides a general way to precisely construct heteropore COFs without formation of isomers. Furthermore, the as-prepared heteropore COFs have hollow-spherical morphology, which has rarely been observed for COFs, and an uncommon staggered AB stacking was observed for the layers of the 2D heteropore COFs.

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Section: Introductionmentioning

confidence: 99%

Precision Construction of 2D Heteropore Covalent Organic Frameworks by a Multiple‐Linking‐Site Strategy

Qian

Jiang

et al. 2016

Chemistry A European J

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“…[ 5 ] Sulfur-based cathodes are comparably low by cost since the active material is abundantly available, exhibit a broad operating temperature range, [ 6 ] and contain an intrinsic protection mechanism against overcharging, which greatly enhances battery safety. [ 12 ] Different polymeric precursor routes, [ 13 ] templating approaches, [ 14 ] and post-synthesis activation [ 15 ] /annealing [ 16 ] procedures can be applied to CDCs to further enhance their properties. In EDLCs such components provide the surface area for the adsorption of electrolyte ions to form the Helmholtz double layer.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Carbide‐Derived Carbon Foams with Advanced Mesostructure as a Versatile Electrochemical Energy‐Storage Material

Oschatz

Borchardt

Pinkert

et al. 2013

Advanced Energy Materials

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Highly porous carbide-derived carbon (CDC) mesofoams (DUT-70) are prepared by nanocasting of mesocellular silica foams with a polycarbosilane precursor. Ceramic conversion followed by silica removal and high-temperature chlorine treatment yields CDCs with a hierarchical micro-mesopore arrangement. This new type of polymer-based CDC is characterized by specifi c surface areas as high as 2700 m 2 g −1 , coupled with ultrahigh microand mesopore volumes up to 2.6 cm 3 g −1 . The relationship between synthesis conditions and the properties of the resulting carbon materials is described in detail, allowing precise control of the properties of DUT-70. Since the hierarchical pore system ensures both effi cient mass transfer and high capacities, the novel CDC shows outstanding performance as an electrode material in electrochemical double-layer capacitors (EDLCs) with specifi c capacities above 240 F g −1 when measured in a symmetrical two-electrode confi guration. Remarkable capacities of 175 F g −1 can be retained even at high current densities of 20 A g −1 as a result of the enhanced ion-transport pathways provided by the cellular mesostructure. Moreover, DUT-70 can be infi ltrated with sulfur and host the active material in lithium-sulfur battery cathodes. Reversible capacities of 790 mAh g −1 are achieved at a current rate of C/10 after 100 cycles, which renders DUT-70 an ideal support material for electrochemical energy-storage applications.

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“…Along with fundamentally interesting 0D, 1D, and 2D allotropes, such as fullerenes, nanotubes and graphene, 3D porous carbon architectures are useful in many emerging energy related applications, [1,2] such as battery anodes, electrode materials for supercapacitors, and catalyst supports in fuel cells. [2][3][4][5][6] In addition to their high surface areas and high conductivity, porous carbons are environmentally benign and show many attractive properties. [1,[7][8][9] Among those, activated and templated carbons are the most widely studied, but carbide-derived carbons (CDCs) produced by the thermal or thermochemical removal of metals from carbides have received much attention in the past decade.…”

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confidence: 99%

Room‐Temperature Carbide‐Derived Carbon Synthesis by Electrochemical Etching of MAX Phases

et al. 2014

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Porous carbons are widely used in energy storage and gas separation applications, but their synthesis always involves high temperatures. Herein we electrochemically selectively extract, at ambient temperature, the metal atoms from the ternary layered carbides, Ti 3 AlC 2 , Ti 2 AlC and Ti 3 SiC 2 (MAX phases). The result is a predominantly amorphous carbide-derived carbon, with a narrow distribution of micropores. The latter is produced by placing the carbides in HF, HCl or NaCl solutions and applying anodic potentials. The pores that form when Ti 3 AlC 2 is etched in dilute HF are around 0.5 nm in diameter. This approach forgoes energy-intensive thermal treatments and presents a novel method for developing carbons with finely tuned pores for a variety of applications, such as supercapacitor, battery electrodes or CO 2 capture.

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Aus Carbiden abgeleitete Kohlenstoffmonolithe mit hierarchischer Porenarchitektur

Cited by 16 publications

References 39 publications

Precision Construction of 2D Heteropore Covalent Organic Frameworks by a Multiple‐Linking‐Site Strategy

Precision Construction of 2D Heteropore Covalent Organic Frameworks by a Multiple‐Linking‐Site Strategy

Hierarchical Carbide‐Derived Carbon Foams with Advanced Mesostructure as a Versatile Electrochemical Energy‐Storage Material

Room‐Temperature Carbide‐Derived Carbon Synthesis by Electrochemical Etching of MAX Phases

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