Defect formation-induced tunable evolution of oxygen functional groups for sodium storage in porous graphene

2020 ◽  
Vol 56 (7) ◽  
pp. 1089-1092 ◽  
Author(s):  
Jianqi Ye ◽  
Hanqing Zhao ◽  
Mengmeng Kang ◽  
Wei Song ◽  
Qingqiang Kong ◽  
...  
Keyword(s):  
Functional Groups ◽  
Defect Formation ◽  
Porous Graphene ◽  
Oxygen Functional Groups ◽  
Evolution Of Oxygen ◽  
Sodium Storage

Defects were engineered in order to induce the evolution of oxygen functional groups, and the ring defects were responsible for the distribution of groups with CO bonds.

Adsorption dominant sodium storage in three-dimensional coal-based graphite microcrystal/graphene composites

2019 ◽  
Vol 7 (13) ◽  
pp. 7565-7572 ◽  
Author(s):  
Mengmeng Kang ◽  
Hanqing Zhao ◽  
Jianqi Ye ◽  
Wei Song ◽  
Hanting Shen ◽  
...  
Keyword(s):  
Functional Groups ◽  
Three Dimensional ◽  
Oxygen Functional Groups ◽  
Sodium Storage

Various oxygen functional groups could provide plentiful reactive sites, which contribute significantly to sodium storage.

The evolution of oxygen-functional groups of graphene oxide as a function of oxidation degree

2021 ◽  
pp. 125629
Author(s):  
Nuor Sariyan Suhaimin ◽  
Mohamad Fahrul Radzi Hanifah ◽  
Masaud Azhar ◽  
Juhana Jaafar ◽  
Madzlan Aziz ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Functional Groups ◽  
Oxidation Degree ◽  
Oxygen Functional Groups ◽  
Evolution Of Oxygen

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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