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BET theory
About: BET theory is a research topic. Over the lifetime, 9046 publications have been published within this topic receiving 286142 citations.
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TL;DR: In this article, the NH2-UiO-66, a metal organic framework (MOF) with zirconium as metal and amino terephthalic acid as a linker, was reported.
94 citations
TL;DR: In this article, flexible and freestanding carbon nanofibers derived from PIM-1, a microporous polymer with high free volume, were prepared by pyrolysis of the electrospun polymer.
Abstract: Electrochemical double layer capacitors (EDLCs) utilize electrodes with high surface area to achieve high-energy storage capability. In this study, flexible and freestanding carbon nanofibers derived from PIM-1, a microporous polymer with high free volume, were prepared by pyrolysis of the electrospun polymer. A BET surface area of 546 m2 g−1 was obtained upon carbonization of the electrospun PIM-1 fibers. After further heat treatments such as steam-activation and annealing, the surface area increased to 1162 m2 g−1. These carbon fibers were directly used as electrodes without the use of binders in a coin cell (CR2032) configuration and were characterized by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. The activated and annealed fibers gave a specific capacitance of 120 F g−1 at a scan rate of 10 mV s−1 using 1,3-ethylmethylimidizaolium bis(trifluoromethanesulfonyl)imide as the ionic liquid electrolyte. From the galvanostatic charge–discharge test, the supercapacitor exhibited energy and power densities of 60 W h kg−1 (active material) and 1.7 kW kg−1, respectively, at a current density of 1 A g−1. High power application of this device was demonstrated by its 77% retention of the energy density (47 W h kg−1) at a higher discharge current density of 5 A g−1.
94 citations
TL;DR: In this article, nanosized nickel aluminate spinel particles have been synthesized with the aid of ultrasound radiation by a precursor approach using an aqueous solution of nickel nitrate, aluminium nitrate and urea.
Abstract: Nanosized nickel aluminate spinel particles have been synthesized with the aid of ultrasound radiation by a precursor approach. Sonicating an aqueous solution of nickel nitrate, aluminium nitrate and urea yields a precursor which on heating at 950 °C for 14 h yields nanosized NiAl 2 O 4 particles with a size of ca. 13 nm and with a surface area of about 108 m 2 g −1 . The nanosized nickel aluminate particles as well as the precursor have been characterized by elemental analysis, powder X-ray diffraction, Transmission electron microscopy, Thermogravimetric analysis, DSC, FT-IR, Diffuse reflectance spectroscopy and BET surface area measurements.
94 citations
TL;DR: In this article, the effect of variations of the anions and cations of ILs, the alkyl chain length on imidazolium cation and IL concentration in the reaction system on the pore structure and thermal stability of the silica gel materials was preliminarily studied.
94 citations
TL;DR: Carbon-coated anatase catalysts were prepared from polyvinyl alcohol (PVA) and commercial TiO2 (ST-01) and were mixed with different mass ratios and were heated at 700 and 900°C under nitrogen.
Abstract: Carbon-coated anatase catalysts were prepared from poly(vinyl alcohol) (PVA) and TiO2 of anatase structure. Powders of PVA and commercial TiO2 (ST-01) were mixed with different mass ratios and were heated at 700 and 900 °C under nitrogen. Such prepared catalysts were tested for adsorption and decomposition of two different dyes: methylene blue (MB) and Reactive Black 5 (RB5). Photoactivities of carbon-coated anatase catalysts were compared with ST-01. Carbon coating anatase suppressed anatase transformation to rutile at high temperatures. It was experimentally proved that this suppression appeared in samples with carbon content above 5 mass%. The crystalline structure of anatase was improved in catalysts heated at 900 °C. Although the sintering of anatase crystals was depressed by the carbon layer, the BET surface area of catalysts decreased, but not so much as it was observed in ST-01 heated at 700 °C. Adsorption of both dyes, MB and RB5 on carbon-coated samples was much more higher than on the original ST-01 and that heated at 700 °C. MB photodecomposition was much more higher on carbon-coated TiO2 catalysts than on ST-01. But Reactive Black 5 was decomposed faster on ST-01 than on carbon-coated TiO2. It can be explained by different mechanism of photodecomposition. Surface diffusion of adsorbed species through the carbon layer slowed down the rate of decomposition. High crystalline structure of anatase seems to be important in the photodecomposition process.
94 citations