High-performance hybrid supercapacitor of mixed-valence manganese oxide/N-doped graphene aerogel nanoflower using an ionic liquid with a redox additive as the electrolyte: In situ electrochemical X-ray absorption spectroscopy

2018 ◽  
Vol 271 ◽  
pp. 110-119 ◽  
Author(s):  
Nattapol Ma ◽  
Nutthaphon Phattharasupakun ◽  
Juthaporn Wutthiprom ◽  
Chan Tanggarnjanavalukul ◽  
Phatsawit Wuanprakhon ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Manganese Oxide ◽  
High Performance ◽  
Mixed Valence ◽  
Hybrid Supercapacitor ◽  
Graphene Aerogel ◽  
X Ray ◽  
Doped Graphene ◽  
X Ray Absorption

High-Performance Supercapacitors of N-Doped Graphene Aerogel and Its Nanocomposites with Manganese Oxide and Polyaniline

2018 ◽  
Vol 165 (7) ◽  
pp. A1430-A1439 ◽  
Author(s):  
Nutthaphon Phattharasupakun ◽  
Juthaporn Wutthiprom ◽  
Nattapol Ma ◽  
Phansiri Suktha ◽  
Montree Sawangphruk
Keyword(s):  
Manganese Oxide ◽  
High Performance ◽  
Graphene Aerogel ◽  
Doped Graphene

scholarly journals Redox Processes of Manganese Oxide in Catalyzing Oxygen Evolution and Reduction: An in Situ Soft X-ray Absorption Spectroscopy Study

2017 ◽  
Vol 121 (33) ◽  
pp. 17682-17692 ◽  
Author(s):  
Marcel Risch ◽  
Kelsey A. Stoerzinger ◽  
Binghong Han ◽  
Tom Z. Regier ◽  
Derek Peak ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Oxygen Evolution ◽  
Absorption Spectroscopy ◽  
Redox Processes ◽  
Spectroscopy Study ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Photolysis of Fluorinated Graphites with Embedded Acetonitrile Using a White-Beam Synchrotron Radiation

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 231
Author(s):  
Galina I. Semushkina ◽  
Yuliya V. Fedoseeva ◽  
Anna A. Makarova ◽  
Dmitry A. Smirnov ◽  
Igor P. Asanov ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Photon Irradiation ◽  
Nexafs Spectroscopy ◽  
White Beam ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
X Ray Absorption

Fluorinated graphitic layers with good mechanical and chemical stability, polar C–F bonds, and tunable bandgap are attractive for a variety of applications. In this work, we investigated the photolysis of fluorinated graphites with interlayer embedded acetonitrile, which is the simplest representative of the acetonitrile-containing photosensitizing family. The samples were continuously illuminated in situ with high-brightness non-monochromatized synchrotron radiation. Changes in the compositions of the samples were monitored using X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The NEXAFS N K-edge spectra showed that acetonitrile dissociates to form HCN and N2 molecules after exposure to the white beam for 2 s, and the latter molecules completely disappear after exposure for 200 s. The original composition of fluorinated matrices CF0.3 and CF0.5 is changed to CF0.10 and GF0.17, respectively. The highly fluorinated layers lose fluorine atoms together with carbon neighbors, creating atomic vacancies. The edges of vacancies are terminated with the nitrogen atoms and form pyridinic and pyrrolic units. Our in situ studies show that the photolysis products of acetonitrile depend on the photon irradiation duration and composition of the initial CFx matrix. The obtained results evaluate the radiation damage of the acetonitrile-intercalated fluorinated graphites and the opportunities to synthesize nitrogen-doped graphene materials.

Sign in / Sign up

Export Citation Format

Share Document