Double graphitic-N doping for enhanced catalytic oxidation activity of carbocatalysts

2019 ◽  
Vol 21 (10) ◽  
pp. 5481-5488 ◽  
Author(s):  
Meiling Hou ◽  
Xin Zhang ◽  
Shandong Yuan ◽  
Wanglai Cen
Keyword(s):  
Work Function ◽  
Catalytic Oxidation ◽  
Functional Groups ◽  
Reactive Oxygen ◽  
Catalytic Efficiency ◽  
Oxidation Activity ◽  
Promotion Effect ◽  
Oxygen Functional Groups ◽  
N Doping

Double-GrN remarkably enhanced the catalytic efficiency for O2 dissociation reactions and accelerates the generation of highly chemically reactive oxygen functional groups. The promotion effect is ascribed to the reduction of the work function of carbocatalysts due to N doping, which facilitates the transfer of electrons from carbocatalysts to the adsorbed O2 molecules for their activation.

An HASApf–redoxin complex causing asymmetric catalytic oxidation via the regenerative formation of a reactive oxygen species

2015 ◽  
Vol 44 (29) ◽  
pp. 13384-13393 ◽  
Author(s):  
Hiroyuki Nagaoka
Keyword(s):  
Reactive Oxygen Species ◽  
Catalytic Oxidation ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Oxidation Activity ◽  
Asymmetric Oxidation ◽  
E Coli ◽  
Asymmetric Catalytic ◽  
Similar Protein

A PP (pea)-HASApf–redoxin complex eluted from encapsulated PP gel with aeration displays asymmetric oxidation activity over 200 times greater than that of a similar protein expressed by E. coli cells.

Promotion effect of oxygen-containing functional groups and Fe species on Pd@graphene for CO catalytic oxidation

2017 ◽  
Vol 41 (20) ◽  
pp. 12052-12060 ◽  
Author(s):  
Yinshuang Zhao ◽  
Fang Dong ◽  
Weiliang Han ◽  
Haijun Zhao ◽  
Zhicheng Tang
Keyword(s):  
Catalytic Activity ◽  
Catalytic Oxidation ◽  
Functional Groups ◽  
Promotion Effect ◽  
Fe Species ◽  
Co Catalytic Oxidation ◽  
Effect Of Oxygen

Catalysts using graphene as a support possessed higher catalytic activity and stability.

scholarly journals Tuning the performance of vanadium redox flow batteries by modifying the structural defects of the carbon felt electrode

2019 ◽  
Vol 10 ◽  
pp. 1698-1706 ◽  
Author(s):  
Ditty Dixon ◽  
Deepu Joseph Babu ◽  
Aiswarya Bhaskar ◽  
Hans-Michael Bruns ◽  
Joerg J Schneider ◽  
...  
Keyword(s):  
Functional Groups ◽  
Superior Performance ◽  
Carbon Felt ◽  
Redox Flow Batteries ◽  
Oxygen Functional Groups ◽  
Treated Sample ◽  
Flow Batteries ◽  
N Doping ◽  
Plasma Treated Sample ◽  
Vanadium Redox

Polyacrylonitrile (PAN)-based carbon felt was subjected to N2-plasma treatment to increase the heteroatom defects and reactive edge sites as a method to increase the performance in vanadium redox flow batteries (VRFBs). N-doping in the felt was mainly in the form of pyrrolic and pyridinic nitrogen. Even though the amount of oxygen functional groups on the N2-plasma-treated sample was very low, the felt showed enhanced electrochemical performance for both V3+/V2+ as well as V5+/V4+ redox reactions. The result is highly significant as the pristine electrode with the same amount of oxygen functional groups showed significantly less activity for the V3+/V2+ redox reaction. Overall, the single-flow cell experiments with N2-plasma-treated felt showed superior performance compared to the pristine sample. Therefore, the enhanced performance observed for the N2-plasma-treated sample should be attributed to the increase in defects and edge sites. Thus, from the present study, it can be concluded that an alternate way to increase the performance of the VRFBs is to introduce specific defects such as N-doping/substitution or to increase the edge sites. In other words, defects induced in the carbon felt such as heteroatom doping are as beneficial as the presence of oxygen functional groups for the improved performance of VRFBs. Therefore, for an optimum performance of VRFBs, defects such as N-substitution as well as oxygen functionality should be tuned.

Polymer oxidation catalyst containing acidic functional groups

1981 ◽  
Vol 46 (5) ◽  
pp. 1237-1247
Author(s):  
Zdeněk Prokop ◽  
Karel Setínek
Keyword(s):  
Functional Groups ◽  
Elevated Temperatures ◽  
Redox Properties ◽  
Oxidation Catalyst ◽  
Carbon Clusters ◽  
Oxidation Activity ◽  
Redox Sites ◽  
Styrene Divinylbenzene ◽  
Proportional Decrease ◽  
Polymer Oxidation

The catalyst containing redox sites in addition to acid functional groups was prepared by sulphonation of a macroporous chloromethylated styrene-divinylbenzene copolymer with concentrated sulphuric acid at elevated temperatures. Its activity was tested for the oxidation of 2-propanol by molecular oxygen at 120 °C and was found to be comparable to that of the iridium on carbon catalyst.Neutralisation of acid functional groups by alkali metal led to proportional decrease in the oxidation activity. The results of EPR spectroscopic study of these catalysts show that the redox properties of the polymer are caused by carbon clusters which are capable of electron exchange.

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.

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