scholarly journals Electrochemical Evaluation of Surface Modified Free-Standing CNT Electrode for Li–O2 Battery Cathode

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4196
Author(s):  
Ji Hyeon Lee ◽  
Hyun Wook Jung ◽  
In Soo Kim ◽  
Min Park ◽  
Hyung-Seok Kim
Keyword(s):  
Functional Groups ◽  
Atomic Layer ◽  
Free Standing ◽  
Coating Technology ◽  
Oxygen Functional Groups ◽  
Layer Deposition ◽  
Discharge Product ◽  
Effect Of Oxygen ◽  
Surface Modified ◽  
Electrochemical Evaluation

In this study, carbon nanotubes (CNTs) were used as cathodes for lithium–oxygen (Li–O2) batteries to confirm the effect of oxygen functional groups present on the CNT surface on Li–O2 battery performance. A coating technology using atomic layer deposition was introduced to remove the oxygen functional groups present on the CNT surface, and ZnO without catalytic properties was adopted as a coating material to exclude the effect of catalytic reaction. An acid treatment process (H2SO4:HNO3 = 3:1) was conducted to increase the oxygen functional groups of the existing CNTs. Therefore, it was confirmed that ZnO@CNT with reduced oxygen functional groups lowered the charging overpotential by approximately 230 mV and increased the yield of Li2O2, a discharge product, by approximately 13%. Hence, we can conclude that the ZnO@CNT is suitable as a cathode material for Li–O2 batteries.

EFFECT OF OXYGEN BASED FUNCTIONAL GROUPS ON THE NUCLEATION OF TiO2 BY ATOMIC LAYER DEPOSITION: A THEORETICAL AND EXPERIMENTAL STUDY.

2021 ◽  
pp. 124588
Author(s):  
H.A. Borbón-Nuñez ◽  
Jesús Muñiz ◽  
A.G. El Hachimi ◽  
D. Frausto-Silva ◽  
J.L. Gutiérrez-Díaz ◽  
...  
Keyword(s):  
Experimental Study ◽  
Atomic Layer Deposition ◽  
Functional Groups ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Effect Of Oxygen

scholarly journals Distribution of oxygen functional groups of graphene oxide obtained from low-temperature atomic layer deposition of titanium oxide

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 13979-13984 ◽  
Author(s):  
Dong Seok Shin ◽  
Hyun Gu Kim ◽  
Ho Seon Ahn ◽  
Hu Young Jeong ◽  
Youn-Jung Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Low Temperature ◽  
Atomic Layer Deposition ◽  
Titanium Oxide ◽  
Functional Groups ◽  
Atomic Layer ◽  
Oxide Surface ◽  
Oxygen Functional Groups ◽  
Layer Deposition

The island-like distribution of the oxygen functional groups of graphene oxide was identified by deposition of TiO2 on the graphene oxide surface using low-temperature atomic layer deposition.

Carbon Materials for Immobilization of Biologically Active Substances

2020 ◽  
Vol 836 ◽  
pp. 52-57
Author(s):  
O.V. Denisova ◽  
I.I. Rastvorova
Keyword(s):  
Carbon Fibers ◽  
Carbon Materials ◽  
Atomic Layer ◽  
Biologically Active Substances ◽  
Biologically Active ◽  
Layer Deposition ◽  
Atomic Layer Deposition Method ◽  
Activity Of Enzymes ◽  
Surface Modified ◽  
Active Substances

The paper considers applications of carbon materials as carriers of biologically active substances. The atomic layer deposition method allowed chemically synthesizing surface-modified composite materials based on graphite and carbon fibers, which maximally preserved the activity of enzymes and biologically active substances. It is shown that the activity of a biologically active substance depends on the chemical composition and state of the surface of carbon-based carriers.

Behavior of La0.6sr 0.4Co0.2Fe0.2O3-  Cathode Powders Surface Modified by Atomic Layer Deposition for Solid Oxide Fuel Cells

2016 ◽  
Vol 75 (6) ◽  
pp. 195-202 ◽  
Author(s):  
J. F. Roeder ◽  
A. F. Zeberoff ◽  
P. C. Van Buskirk ◽  
A. Torabi ◽  
J. Barton ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Atomic Layer Deposition ◽  
Solid Oxide Fuel Cells ◽  
Atomic Layer ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Layer Deposition ◽  
Surface Modified

scholarly journals Proton Exchange Membrane Fuel Cell Flooding Caused by Residual Functional Groups after Platinum Atomic Layer Deposition

2017 ◽  
Vol 237 ◽  
pp. 192-198 ◽  
Author(s):  
Alia M. Lubers ◽  
William W. McNeary ◽  
Daryl J. Ludlow ◽  
Austin W. Drake ◽  
Matthias Faust ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Atomic Layer Deposition ◽  
Functional Groups ◽  
Proton Exchange Membrane ◽  
Atomic Layer ◽  
Proton Exchange ◽  
Layer Deposition ◽  
Residual Functional ◽  
Exchange Membrane

scholarly journals Adsorption of Titanium Halides on Nitride and Oxide Surfaces during Atomic Layer Deposition: A DFT Study

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 712
Author(s):  
Jeongwoo Park ◽  
Neung Kyung Yu ◽  
Donghak Jang ◽  
Eunae Jung ◽  
Hyunsik Noh ◽  
...  
Keyword(s):  
Thin Films ◽  
Atomic Layer Deposition ◽  
Functional Groups ◽  
Density Functional ◽  
Substrate Surface ◽  
Atomic Layer ◽  
Dissociative Adsorption ◽  
Reaction Rate Constant ◽  
Dft Study ◽  
Layer Deposition

Various processes based on atomic layer deposition (ALD) have been reported for growing Ti-based thin films such as TiN and TiO2. To improve the uniformity and conformity of thin films grown via ALD, fundamental understanding of the precursor–substrate surface reactions is required. Herein, we present a density functional theory (DFT) study of the initial nucleation process of some titanium halide precursors (TiCl4, TiBr4, and TiI4) on Si surfaces having –OH or –NH2 functional groups. We consider the most favorable adsorption site in the reaction between the precursor and functional group of the surface, based on the thermodynamics and kinetics of the reaction. Sequential dissociation reaction mechanisms of halide ligands were systematically investigated. The exothermicity of the dissociative adsorption was found to be in the order of: TiI4 > TiBr4 > TiCl4. In addition, the precursors were observed to be more exothermic and show higher reaction rate constant when adsorbed on the –OH–terminated surface than on the –NH2–terminated surface. These observations reveal the selectivity of deposition by surface functional groups.

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