scholarly journals Structural analysis of carbon materials by X-ray photoelectron spectroscopy using computational chemistry

TANSO ◽  
2015 ◽  
Vol 2015 (269) ◽  
pp. 181-189 ◽  
Author(s):  
Yasuhiro Yamada ◽  
Satoshi Sato
Keyword(s):  
Structural Analysis ◽  
Computational Chemistry ◽  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
X Ray

scholarly journals Structural Analysis of 65ZnO–30P2O5–5Nb2O5 Invert Glass Using X-ray Photoelectron Spectroscopy

2019 ◽  
Vol 60 (8) ◽  
pp. 1707-1710 ◽  
Author(s):  
Patrícia S. Sato ◽  
Toshiki Watanabe ◽  
Hirotaka Maeda ◽  
Akiko Obata ◽  
Toshihiro Kasuga
Keyword(s):  
Structural Analysis ◽  
Photoelectron Spectroscopy ◽  
X Ray

scholarly journals Hydrothermal Activation of Porous Nitrogen-Doped Carbon Materials for Electrochemical Capacitors and Sodium-Ion Batteries

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2163 ◽  
Author(s):  
Yuliya V. Fedoseeva ◽  
Egor V. Lobiak ◽  
Elena V. Shlyakhova ◽  
Konstantin A. Kovalenko ◽  
Viktoriia R. Kuznetsova ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Nanomaterials ◽  
Carbon Materials ◽  
Sodium Ion ◽  
Carbon Surface ◽  
Energy Storage And Conversion ◽  
Sodium Ion Batteries ◽  
X Ray ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Highly porous nitrogen-doped carbon nanomaterials have distinct advantages in energy storage and conversion technologies. In the present work, hydrothermal treatments in water or ammonia solution were used for modification of mesoporous nitrogen-doped graphitic carbon, synthesized by deposition of acetonitrile vapors on the pyrolysis products of calcium tartrate. Morphology, composition, and textural characteristics of the original and activated materials were studied by transmission electron microscopy, X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure spectroscopy, infrared spectroscopy, and nitrogen gas adsorption method. Both treatments resulted in a slight increase in specific surface area and volume of micropores and small mesopores due to the etching of carbon surface. Compared to the solely aqueous medium, activation with ammonia led to stronger destruction of the graphitic shells, the formation of larger micropores (1.4 nm vs. 0.6 nm), a higher concentration of carbonyl groups, and the addition of nitrogen-containing groups. The tests of nitrogen-doped carbon materials as electrodes in 1M H2SO4 electrolyte and sodium-ion batteries showed improvement of electrochemical performance after hydrothermal treatments especially when ammonia was used. The activation method developed in this work is hopeful to open up a new route of designing porous nitrogen-doped carbon materials for electrochemical applications.

scholarly journals Porous Carbon Materials Obtained by the Hydrothermal Carbonization of Orange Juice

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 655 ◽  
Author(s):  
Francesco Veltri ◽  
Francesca Alessandro ◽  
Andrea Scarcello ◽  
Amerigo Beneduci ◽  
Melvin Arias Polanco ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Photoelectron Spectroscopy ◽  
Orange Juice ◽  
Carbon Materials ◽  
Sorption Isotherms ◽  
Hydrothermal Carbonization ◽  
Carbon Quantum Dots ◽  
Energy Storage Devices ◽  
X Ray ◽  
Porous Carbon Materials

Porous carbon materials are currently subjected to strong research efforts mainly due to their excellent performances in energy storage devices. A sustainable process to obtain them is hydrothermal carbonization (HTC), in which the decomposition of biomass precursors generates solid products called hydrochars, together with liquid and gaseous products. Hydrochars have a high C content and are rich with oxygen-containing functional groups, which is important for subsequent activation. Orange pomace and orange peels are considered wastes and then have been investigated as possible feedstocks for hydrochars production. On the contrary, orange juice was treated by HTC only to obtain carbon quantum dots. In the present study, pure orange juice was hydrothermally carbonized and the resulting hydrochar was filtered and washed, and graphitized/activated by KOH in nitrogen atmosphere at 800 °C. The resulting material was studied by transmission and scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and nitrogen sorption isotherms. We found porous microspheres with some degree of graphitization and high nitrogen content, a specific surface of 1725 m2/g, and a pore size distribution that make them good candidates for supercapacitor electrodes.

Amorphization of carbon materials studied by X-ray photoelectron spectroscopy

2006 ◽  
Vol 242 (1-2) ◽  
pp. 445-447 ◽  
Author(s):  
Katsumi Takahiro ◽  
Atsushi Terai ◽  
Shinnosuke Oizumi ◽  
Kiyoshi Kawatsura ◽  
Shunya Yamamoto ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
X Ray

Chemical structural analysis of diamond-like carbon by X-ray photoelectron spectroscopy

Carbon ◽  
2009 ◽  
Vol 47 (4) ◽  
pp. 1208
Author(s):  
Susumu Takabayashi ◽  
Keishi Okamoto ◽  
Tatsuyuki Nakatani ◽  
Hiroyuki Sakaue ◽  
Takayuki Takahagi
Keyword(s):  
Structural Analysis ◽  
Photoelectron Spectroscopy ◽  
Diamond Like Carbon ◽  
X Ray

Nitrogen Configuration of Polybenzoxazine Carbide

2015 ◽  
Vol 34 (3) ◽  
Author(s):  
Huachuan Zhang ◽  
Wu Gu ◽  
Rongqi Zhu ◽  
Qichao Ran ◽  
Yi Gu
Keyword(s):  
Mass Spectrometry ◽  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
Amine Nitrogen ◽  
X Ray ◽  
Pyrolysis Gas Chromatography ◽  
First Time ◽  
Pyridinic Nitrogen

AbstractCarbon materials should have specific centers for its functionalities. In this study, the specific centers of polybenzoxazine carbides were studied for the first time. Three classical benzoxazine monomers were chose as the object. The transformation of nitrogen configuration of polybenzoxazines carbides was characterized via pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS) and X-ray photoelectron spectroscopy (XPS). The results showed that the tertiary amine nitrogen converted to pyridinic nitrogen and pyrrolic nitrogen incorporated in graphene residuals during the carbonization, which were the specific centers for the functionality.

scholarly journals Enhanced CO2 Adsorption on Nitrogen-Doped Carbon Materials by Salt and Base Co-Activation Method

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1207 ◽  
Author(s):  
Ruiping Wei ◽  
Xingchao Dai ◽  
Feng Shi
Keyword(s):  
Photoelectron Spectroscopy ◽  
Carbon Materials ◽  
Co2 Adsorption ◽  
Activation Method ◽  
Formaldehyde Resin ◽  
Co2 Absorption ◽  
X Ray ◽  
Nitrogen Doped ◽  
Co Activation ◽  
Nitrogen Doped Carbon

Nitrogen-doped carbon materials with enhanced CO2 adsorption were prepared by the salt and base co-activation method. First, resorcinol-formaldehyde resin was synthesized with a certain salt as an additive and used as a precursor. Next, the resulting precursor was mixed with KOH and subsequently carbonized under ammonia flow to finally obtain the nitrogen-doped carbon materials. A series of samples, with and without the addition of different salts, were prepared, characterized by XRD (X-ray powder diffraction), elemental analysis, BET (N2-adsorption-desorption analysis), XPS (X-ray photoelectron spectroscopy) and SEM (Scanning electron microscopy) and tested for CO2 adsorption. The results showed that the salt and base co-activation method has a remarkable enhancing effect on the CO2 capture capacity. The combination of KCl and KOH was proved to be the best combination, and 167.15 mg CO2 could be adsorbed with 1 g nitrogen-doped carbon at 30 °C under 1 atm pressure. The materials characterizations revealed that the introduction of the base and salt could greatly increase the content of doped nitrogen, the surface area and the amount of formed micropore, which led to enhanced CO2 absorption of the carbon materials.

Chemical Structural Analysis of Ion-Beam Exposed Polyimide Films by Means of X-Ray Photoelectron Spectroscopy.

Shinku ◽  
1997 ◽  
Vol 40 (3) ◽  
pp. 187-189
Author(s):  
Lulu ZHANG ◽  
Takeshi KAWABATA ◽  
Kazumasa TAKATA ◽  
Toshiaki YASUI ◽  
Hirokazu TAHARA ◽  
...  
Keyword(s):  
Structural Analysis ◽  
Photoelectron Spectroscopy ◽  
Ion Beam ◽  
Polyimide Films ◽  
X Ray
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