Characterization of High Surface Area Silicon Oxynitrides

1992 ◽  
Vol 271 ◽  
Author(s):  
Peter W. Lednor ◽  
Rene De Ruiter ◽  
Kees A. Emeis
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
High Surface ◽  
High Surface Area ◽  
X Ray ◽  
Silicon Oxynitrides

ABSTRACTHigh surface area silicon oxynitrides have been prepared by nitrida- tion of silica with ammonia. Characterization by Fourier-transform infrared spectroscopy has allowed quantitative determination of hydroxyl, amido and imido groups. Data obtained by X-ray photoelectron spectroscopy show that the nitrogen is well distributed in the surface of the materials.

Deposition and Characterization of Nanostructural IrOx by RF Sputtering

2012 ◽  
Vol 194 ◽  
pp. 129-132 ◽  
Author(s):  
Kwong Kau Tiong ◽  
Cheng Hsien Lin ◽  
Yi Min Chen ◽  
Ying Sheng Huang ◽  
Kuei Yi Lee ◽  
...  
Keyword(s):  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
High Surface ◽  
High Surface Area ◽  
Rf Sputtering ◽  
Spectroscopic Properties ◽  
Spectroscopy Analysis ◽  
Supercapacitor Application ◽  
Steel Substrates

Large surface area nanostructural IrOx films were deposited on stainless steel substrates by reactive radio frequency magnetron sputtering using Ir metal target. The structural and spectroscopic properties of the nanostructural IrOx were characterized. The micrographs of field emission scanning electron microscopy showed the formation of folded leaves with chiffon-like structure for the as-deposited samples. X-ray photoelectron spectroscopy analysis provided the information of the oxidation states and the stoichiometry of IrOxNL. Raman spectra revealed the amorphous-like phase of the as-deposited nanostructural IrOx. The chiffon-like structure provides ultra-high surface area for electrical charge storage which makes the IrOxNL as an attractive candidate for the supercapacitor application.

scholarly journals Operando X-ray characterization of high surface area iridium oxides to decouple their activity losses for the oxygen evolution reaction

2019 ◽  
Vol 12 (10) ◽  
pp. 3038-3052 ◽  
Author(s):  
Mauro Povia ◽  
Daniel F. Abbott ◽  
Juan Herranz ◽  
Adrian Heinritz ◽  
Dmitry Lebedev ◽  
...  
Keyword(s):  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Surface ◽  
High Surface Area ◽  
Oxide Catalysts ◽  
X Ray ◽  
Iridium Oxides ◽  
Evolution Of Oxygen

Operando X-ray techniques allow an unprecedented, quantitative discrimination of the instability mechanisms affecting Ir-oxide catalysts for the evolution of oxygen.

scholarly journals Characteristics of High Surface Area Molybdenum Nitride and Its Activity for the Catalytic Decomposition of Ammonia

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 192
Author(s):  
Seo-Hyeon Baek ◽  
Kyunghee Yun ◽  
Dong-Chang Kang ◽  
Hyejin An ◽  
Min Bum Park ◽  
...  
Keyword(s):  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Decomposition ◽  
Molybdenum Nitride ◽  
X Ray ◽  
Temperature Programmed Oxidation ◽  
Oxidation Reduction ◽  
Temperature Programmed

High surface area (>170 m2 g−1) molybdenum nitride was prepared by the temperature-programmed nitridation of α-MoO3 with pure ammonia. The process was optimized by adjusting the experimental variables: the reaction temperature, heating rate, and molar flow rate of ammonia. The physicochemical properties of the as-formed molybdenum nitride were characterized by X-ray diffraction, N2 sorption, transmission electron microscopy, temperature-programmed oxidation/reduction, and X-ray photoelectron spectroscopy. Of the experimental variables, the nitridation temperature was found to be the most critical parameter determining the surface area of the molybdenum nitride. When the prepared molybdenum nitride was exposed to air, the specific surface area rapidly decreased because of the partial oxidation of molybdenum nitride to molybdenum oxynitride. However, the surface area recovered to 90% the initial value after H2 treatment. The catalyst with the highest degree of nitridation showed the best catalytic activity, superior to that of unmodified α-MoO3, for the decomposition of ammonia because of its high surface area.

Three-dimensional characterization of electrodeposited lithium microstructures using synchrotron X-ray phase contrast imaging

2015 ◽  
Vol 51 (2) ◽  
pp. 266-268 ◽  
Author(s):  
David S. Eastwood ◽  
Paul M. Bayley ◽  
Hee Jung Chang ◽  
Oluwadamilola O. Taiwo ◽  
Joan Vila-Comamala ◽  
...  
Keyword(s):  
Surface Area ◽  
Phase Contrast ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
Phase Contrast Tomography

The morphology of electrodeposited high surface area lithium microstructures was imaged in 3D using synchrotron X-ray phase contrast tomography.

scholarly journals Green Preparation of High Surface Area Cu-Au Bimetallic Nanostructured Materials by Co-Electrodeposition in a Deep Eutectic Solvent

2021 ◽  
Author(s):  
Elena Plaza Mayoral ◽  
Paula Sebastián Pascual ◽  
Kim Nicole Dalby ◽  
Kim Degn Jensen ◽  
Ib Chorkendorff ◽  
...  
Keyword(s):  
Surface Area ◽  
Nanostructured Materials ◽  
Photoelectron Spectroscopy ◽  
Choline Chloride ◽  
High Surface ◽  
High Surface Area ◽  
Deep Eutectic Solvent ◽  
Fold Increase ◽  
Active Surface Area ◽  
X Ray

In this work we present an electrodeposition method in a deep eutectic solvent (DES) to prepare bimetallic high surface area nanostructures of Cu and Au with tunable structure and composition. The metal electrodeposition performed in green choline chloride within a urea deep eutectic solvent allows us to tailor the size, morphology and elemental composition of the deposits. We combine electrochemical methods with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) to characterize the electrodeposited nanostructured materials. We assess the increase of the electroactive surface area through the analysis of the lead underpotential deposition (UPD) on the prepared films. We observe a 5 to 15-fold increase of the active surface area compared to flat surfaces of polycrystalline Cu or Au. Our work reports, for the first time, a green route for the electrodeposition of Cu-Au bimetallic nanostructures in a deep eutectic solvent.

scholarly journals Green Preparation of High Surface Area Cu-Au Bimetallic Nanostructured Materials by Co-Electrodeposition in a Deep Eutectic Solvent

2021 ◽  
Author(s):  
Elena Plaza Mayoral ◽  
Paula Sebastián Pascual ◽  
Kim Nicole Dalby ◽  
Kim Degn Jensen ◽  
Ib Chorkendorff ◽  
...  
Keyword(s):  
Surface Area ◽  
Nanostructured Materials ◽  
Photoelectron Spectroscopy ◽  
Choline Chloride ◽  
High Surface ◽  
High Surface Area ◽  
Deep Eutectic Solvent ◽  
Fold Increase ◽  
Active Surface Area ◽  
X Ray

In this work we present an electrodeposition method in a deep eutectic solvent (DES) to prepare bimetallic high surface area nanostructures of Cu and Au with tunable structure and composition. The metal electrodeposition performed in green choline chloride within a urea deep eutectic solvent allows us to tailor the size, morphology and elemental composition of the deposits. We combine electrochemical methods with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) to characterize the electrodeposited nanostructured materials. We assess the increase of the electroactive surface area through the analysis of the lead underpotential deposition (UPD) on the prepared films. We observe a 5 to 15-fold increase of the active surface area compared to flat surfaces of polycrystalline Cu or Au. Our work reports, for the first time, a green route for the electrodeposition of Cu-Au bimetallic nanostructures in a deep eutectic solvent.

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