Electrochemical performance improvement of N-doped graphene as electrode materials for supercapacitors by optimizing the functional groups

RSC Advances ◽  
2015 ◽  
Vol 5 (17) ◽  
pp. 12583-12591 ◽  
Author(s):  
Wei Li ◽  
Hong-Yan Lü ◽  
Xing-Long Wu ◽  
Hongyu Guan ◽  
Ying-Ying Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Performance Improvement ◽  
Functional Groups ◽  
Electrode Materials ◽  
Doped Graphene

The electrochemical properties of doped graphene as electrode materials for supercapacitors can be significantly enhanced by optimizing the surface nitrogen functional groups.

scholarly journals Combined effect of nitrogen-doped functional groups and porosity of porous carbons on electrochemical performance of supercapacitors

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anna Ilnicka ◽  
Malgorzata Skorupska ◽  
Mariusz Szkoda ◽  
Zuzanna Zarach ◽  
Piotr Kamedulski ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Functional Groups ◽  
Electrode Materials ◽  
Electrochemical Behaviour ◽  
Porous Carbons ◽  
Nitrogen Doped ◽  
Surface Areas ◽  
Area Functional ◽  
Nitrogen Contents

AbstractIn this work, nitrogen-doped porous carbons obtained from chitosan, gelatine, and green algae were investigated in their role as supercapacitor electrodes. The effects of three factors on electrochemical performance have been studied—of the specific surface area, functional groups, and a porous structure. Varying nitrogen contents (from 5.46 to 10.08 wt.%) and specific surface areas (from 532 to 1095 m2 g−1) were obtained by modifying the carbon precursor and the carbonization temperature. Doping nitrogen into carbon at a level of 5.74–7.09 wt.% appears to be the optimum for obtaining high electrochemical capacitance. The obtained carbons exhibited high capacitance (231 F g−1 at 0.1 A g−1) and cycle durability in a 0.2 mol L−1 K2SO4 electrolyte. Capacitance retention was equal to 91% at 5 A g−1 after 10,000 chronopotentiometry cycles. An analysis of electrochemical behaviour reveals the influence that nitrogen functional groups have on pseudocapacitance. While quaternary-N and pyrrolic-N nitrogen groups have an enhancing effect, due to the presence of a positive charge and thus improved electron transfer at high current loads, the most important functional group affecting energy storage performance is graphite-N/quaternary-N. The study points out that the search for the most favourable organic precursors is as important as the process of converting precursors to carbon-based electrode materials.

The effects of Ni ions' charge disproportionation on the high electrochemical performance of Ni1−xCoxO nanoparticles

2020 ◽  
Vol 7 (3) ◽  
pp. 610-619 ◽  
Author(s):  
Mingyan Chuai ◽  
Kewei Zhang ◽  
Xi Chen ◽  
Mingzhe Zhang
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Electrode Materials ◽  
Charge Disproportionation

The outstanding electrochemical properties of Ni1−xCoxO electrode materials can be attributed to the Ni ion charge disproportionation, which is caused by Co atom doping.

scholarly journals Micro-area investigation on electrochemical performance improvement with Co and Mn doping in PbO2 electrode materials

RSC Advances ◽  
2021 ◽  
Vol 11 (46) ◽  
pp. 28949-28960
Author(s):  
Ze Lv ◽  
Zhen Chen ◽  
Qiang Yu ◽  
Wei Zhu ◽  
Hongjun You ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Performance Improvement ◽  
Electrode Materials ◽  
Scanning Electrochemical Microscopy ◽  
Mn Doping ◽  
Electrochemical Reactivity ◽  
Pbo2 Electrode ◽  
Electrochemical Microscopy

The causes of the increase in electrochemical reactivity are unveiled from a micro perspective through scanning electrochemical microscopy.

scholarly journals Effect of Combined Conductive Polymer Binder on the Electrochemical Performance of Electrode Materials for Lithium-Ion Batteries

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2163 ◽  
Author(s):  
Svetlana N. Eliseeva ◽  
Mikhail A. Kamenskii ◽  
Elena G. Tolstopyatova ◽  
Veniamin V. Kondratiev
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Lithium Ion Battery ◽  
Electrode Materials ◽  
Lithium Ion ◽  
Active Components ◽  
Electrode Potentials ◽  
Wide Range ◽  
Negative Electrodes

The electrodes of lithium-ion batteries (LIBs) are multicomponent systems and their electrochemical properties are influenced by each component, therefore the composition of electrodes should be properly balanced. At the beginning of lithium-ion battery research, most attention was paid to the nature, size, and morphology peculiarities of inorganic active components as the main components which determine the functional properties of electrode materials. Over the past decade, considerable attention has been paid to development of new binders, as the binders have shown great effect on the electrochemical performance of electrodes in LIBs. The study of new conductive binders, in particular water-based binders with enhanced electronic and ionic conductivity, has become a trend in the development of new electrode materials, especially the conversion/alloying-type anodes. This mini-review provides a summary on the progress of current research of the effects of binders on the electrochemical properties of intercalation electrodes, with particular attention to the mechanisms of binder effects. The comparative analysis of effects of three different binders (PEDOT:PSS/CMC, CMC, and PVDF) for a number of oxide-based and phosphate-based positive and negative electrodes for lithium-ion batteries was performed based on literature and our own published research data. It reveals that the combined PEDOT:PSS/CMC binder can be considered as a versatile component of lithium-ion battery electrode materials (for both positive and negative electrodes), effective in the wide range of electrode potentials.

scholarly journals Electrochemical Properties of Nitrogen and Oxygen Doped Reduced Graphene Oxide

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 312 ◽  
Author(s):  
Sean J. Hartmann ◽  
Anna A. Iurchenkova ◽  
Tanja Kallio ◽  
Ekaterina O. Fedorovskaya
Keyword(s):  
Electrochemical Properties ◽  
Functional Groups ◽  
Graphite Oxide ◽  
Carbon Nanostructures ◽  
Electrode Materials ◽  
Negative Electrode ◽  
Hydrazine Sulfate ◽  
Energy Storage Devices ◽  
Supercapacitor Electrode ◽  
Synthesis Conditions

Carbon nanostructures are promising electrode materials for energy storage devices because of their unique physical and chemical properties. Modification of the surface improves the electrochemical properties of those materials because of the changes in morphology, diffusion properties, and inclusion of additional contributions to redox processes. Oxygen-containing functional groups and nitrogen doped into the carbon matrix significantly contribute to the electrochemical behavior of reduced graphite oxide (RGO). In this work, RGO was synthesized during hydrothermal treatment of graphite oxide with a hydrazine sulfate aqueous solution. Different amounts of hydrazine sulfate were used to synthesize RGO with different nitrogen contents in the structure, and the same synthesis conditions made it possible to obtain a material with a similar composition of oxygen-containing functional groups. The materials with different nitrogen concentrations and similar amounts of oxygen were compared as electrode materials for a supercapacitor and as a negative electrode material for a Li-ion battery. It was shown that the presence of oxygen-containing functional groups has the greatest influence on the behavior and efficiency of supercapacitor electrode materials, while nitrogen atoms embedded in the graphene lattice play the largest role in lithium intercalation.

Morphological and Electrochemical Properties of the Lactose-derived Carbon Electrode Materials

2016 ◽  
Vol 8 (3) ◽  
pp. 03017-1-03017-7 ◽  
Author(s):  
I. F. Myronyuk ◽  
◽  
V. I. Mandzyuk ◽  
V. M. Sachko ◽  
R. P. Lisovsky ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Electrode Materials ◽  
Carbon Electrode
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