The porous structures of activated carbon aerogels and their effects on electrochemical performance

Jun-bing, Wang; Yang, Xiaoqing; Wu, Dehai; Fu, Ruowen; Dresselhaus, M. S.; Dresselhaus, G.

doi:10.1016/j.jpowsour.2008.06.070

Cited by 107 publications

(57 citation statements)

References 11 publications

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“…Ah igh volumeo f macropores in HPC plays an important role in the high rate performance of supercapacitors. [28] X-ray photoelectron spectroscopy (XPS)w as carriedo ut to analyze the surface chemistry of LHPC. The high-resolution O1ss pectrum of LHPC is shown in Figure 3b,w hichc an be deconvoluted into five individual component peaks corresponding to quinone-type groups( 530.4 eV), COOH/C(O)O (531.2 eV), C=O( 531.9 eV), ÀCÀO( 532.8 eV), and ÀOH (533.4 eV).…”

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confidence: 99%

3 D Hierarchical Porous Carbon for Supercapacitors Prepared from Lignin through a Facile Template‐Free Method

et al. 2015

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Lignin-derived hierarchical porous carbon (LHPC) was prepared through a facile template-free method. Solidification of the lignin-KOH solution resulted in KOH crystalizing within lignin. The crystalized KOH particles in solid lignin acted both as template and activating agent in the heat-treatment process. The obtained LHPC, exhibiting a 3D network, consisted of macroporous cores, mesoporous channels, and micropores. The LHPC comprised 12.27 at % oxygen-containing groups, which resulted in pseudocapacitance. The LHPC displayed a capacitance of 165.0 F g(-1) in 1 M H2 SO4 at 0.05 A g(-1) , and the capacitance was still 123.5 F g(-1) even at 10 A g(-1) . The LHPC also displayed excellent cycling stability with capacitance retention of 97.3 % after 5000 galvanostatic charge-discharge cycles. On account of the facile preparation of LHPC, this paper offers a facile alternative method for the preparation of hierarchical porous carbon for electrochemical energy storage devices.

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confidence: 99%

3 D Hierarchical Porous Carbon for Supercapacitors Prepared from Lignin through a Facile Template‐Free Method

et al. 2015

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“…S3. The isotherm is type-III with an H4-type hysteresis loop, indicating a macroporous structure mainly caused by the stacking of the PbCrO 4 nanorods [20][21][22]. The BET surface area is 8.50 m 2 g −1 .…”

Section: Resultsmentioning

confidence: 98%

PbCrO4 yellow-pigment nanorods: An efficient and stable visible-light-active photocatalyst for O2 evolution and photodegradation

Zhang

Liu

et al. 2018

Sci. China Mater.

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Here, PbCrO 4 nanorods, a commonly used and low-cost yellow pigment, was synthesized via a simple precipitation reaction and can serve as a highly efficient oxygen production and photodegradation photocatalyst. The obtained PbCrO 4 nanorods exhibit excellent stability and photocatalytic performance for O 2 evolution from water. The production rate is approximately 314.0 μmol h −1 g −1 under visible light, and the quantum efficiency is approximately 2.16% at 420±10 nm and 0.05% at 600±10 nm. In addition, the PbCrO 4 shows good degradation performance for methylene blue, methyl blue, methyl orange and phenol under visiblelight irradiation. These results indicate that it is potential to fabricate an effective, robust PbCrO 4 photocatalyst by transforming heavy-metal pollutants Pb(II) and Cr(VI) into a highly efficient O 2 evolution and photodegradation material. This strategy which uses pollutant to produce clean energy and degrade contaminants is completely green and environmentally benign, and thus could be a promising way for practical environmental applications.

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“…In the case of potassium hydroxide, the more complex activation mechanism gathering K intercalation in carbon lattice and gasification allows to prepare activated carbon with a large range of yields depending on the precursor: from 80 and 70% [31][32][33] to values, as low as, 20-10% [34][35][36]. KOH allows obtaining superactivated carbons (over 3000…”

Section: Nanoporous Carbon Synthesismentioning

confidence: 99%

Nanoporous Carbon Synthesis: An Old Story with Exciting New Chapters

Mestre¹,

Carvalho²

2018

Porosity - Process, Technologies and Applications

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Activated carbons are key materials in technological applications of multidisciplinary fields (e.g. adsorption, separation, and catalytic processes). The extensive use of these materials results from the combination of a well-developed pore network (micropores or micro + mesopores) along with the presence of heteroatoms (e.g. oxygen, nitrogen, and sulfur). The large scale production of nanoporous carbons is a well-established process since the first patents date from the beginning of the twentieth century. Conventional activation methodologies are divided between physical, using steam or CO 2 , and chemical, being KOH, ZnCl 2 , and H 3 PO 4 the most commonly reported oxidizing agents. Due to the panoply of operational parameters that can be changed or added in the production of activated carbons, there is still room for R&D. In this chapter, both conventional and innovative synthetic processes are reviewed to offer an up-to-date picture regarding raw materials, carbonization step, activation process, and other approaches. Conventional activation of gels and chars obtained by novel approaches (i.e. sol-gel method, hydrothermal carbonization (HTC), and acid-mediated carbonization) and more innovative strategies (i.e. variations of HTC process, carbonization of organic salts and ionothermal approaches) are addressed. Textural, surface chemistry and morphological properties of the derived porous carbons were reviewed and critically rationalized.

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The porous structures of activated carbon aerogels and their effects on electrochemical performance

Cited by 107 publications

References 11 publications

3 D Hierarchical Porous Carbon for Supercapacitors Prepared from Lignin through a Facile Template‐Free Method

3 D Hierarchical Porous Carbon for Supercapacitors Prepared from Lignin through a Facile Template‐Free Method

PbCrO4 yellow-pigment nanorods: An efficient and stable visible-light-active photocatalyst for O2 evolution and photodegradation

Nanoporous Carbon Synthesis: An Old Story with Exciting New Chapters

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