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Carboxyl-Assisted Synthesis of Nitrogen-Doped Graphene Sheets for Supercapacitor Applications.

Xie B, Chen Y, Yu M, Shen X, Lei H, Xie T, Zhang Y, Wu Y - Nanoscale Res Lett (2015)

Bottom Line: The structure of the N-doped graphene with different surface functional groups was characterized by Raman spectroscopy.The research result indicates that the carboxylation of GO is the key factor to obtain pyridinic and pyridone N types during the N atom doping process.Compared to general N-doped graphene, the electrochemical test shows that specific capacitance of the GO-OOH-N sample reaches up to 217 F/g at a discharge current density 1 A/g and stable cycling performance (keep 88.8 % specific capacitance after 500 cycles at the same discharge current density) when applied to the supercapacitor electrode materials.

View Article: PubMed Central - PubMed

Affiliation: Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 388 Lumo RD, Wuhan, 430074, China, 391856294@qq.com.

ABSTRACT
The high ratio of pyridinic and pyridone N-doped graphene sheets have been synthesized by functionalizing graphene oxide (GO) with different oxygen groups on its surface. The typical N-doped graphene was determined to be ~3-5 layers by transmission electron microscopy (TEM) and atomic force microscopy (AFM), and the nitrogen content was measured as 6.8-8 at. % by X-ray photoelectron spectroscopy (XPS). The structure of the N-doped graphene with different surface functional groups was characterized by Raman spectroscopy. The research result indicates that the carboxylation of GO is the key factor to obtain pyridinic and pyridone N types during the N atom doping process. Compared to general N-doped graphene, the electrochemical test shows that specific capacitance of the GO-OOH-N sample reaches up to 217 F/g at a discharge current density 1 A/g and stable cycling performance (keep 88.8 % specific capacitance after 500 cycles at the same discharge current density) when applied to the supercapacitor electrode materials.

No MeSH data available.


XPS C1s and N1s spectra of GO-N (a, b), GO-N-180 (c, d), and GO-OOH-N (e, f); N-containing groups distribution in N-doped graphene samples (g); types of N-containing groups (h)
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Fig4: XPS C1s and N1s spectra of GO-N (a, b), GO-N-180 (c, d), and GO-OOH-N (e, f); N-containing groups distribution in N-doped graphene samples (g); types of N-containing groups (h)

Mentions: After nitrogen doping, C1s peak of all NG samples shows only one main peak at 284.6 eV and can be divided into three sub-peaks centered at approximately 284.6, 286, and 289 eV (see Fig. 4a, c, e), which belong to C-C, C-O/C-N, and C=O/-COOH, respectively. A relative higher -COOH density of GO-OOH-N in both C1s and O1s (Additional file 1: Figure S3) spectra can partially explain the internal reason of its water affinity feature, which is in agreement with the above experimental phenomena. And these oxygen types are favorable to provide pseudocapacitance for high electrochemical performance [39].Fig. 4


Carboxyl-Assisted Synthesis of Nitrogen-Doped Graphene Sheets for Supercapacitor Applications.

Xie B, Chen Y, Yu M, Shen X, Lei H, Xie T, Zhang Y, Wu Y - Nanoscale Res Lett (2015)

XPS C1s and N1s spectra of GO-N (a, b), GO-N-180 (c, d), and GO-OOH-N (e, f); N-containing groups distribution in N-doped graphene samples (g); types of N-containing groups (h)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4542773&req=5

Fig4: XPS C1s and N1s spectra of GO-N (a, b), GO-N-180 (c, d), and GO-OOH-N (e, f); N-containing groups distribution in N-doped graphene samples (g); types of N-containing groups (h)
Mentions: After nitrogen doping, C1s peak of all NG samples shows only one main peak at 284.6 eV and can be divided into three sub-peaks centered at approximately 284.6, 286, and 289 eV (see Fig. 4a, c, e), which belong to C-C, C-O/C-N, and C=O/-COOH, respectively. A relative higher -COOH density of GO-OOH-N in both C1s and O1s (Additional file 1: Figure S3) spectra can partially explain the internal reason of its water affinity feature, which is in agreement with the above experimental phenomena. And these oxygen types are favorable to provide pseudocapacitance for high electrochemical performance [39].Fig. 4

Bottom Line: The structure of the N-doped graphene with different surface functional groups was characterized by Raman spectroscopy.The research result indicates that the carboxylation of GO is the key factor to obtain pyridinic and pyridone N types during the N atom doping process.Compared to general N-doped graphene, the electrochemical test shows that specific capacitance of the GO-OOH-N sample reaches up to 217 F/g at a discharge current density 1 A/g and stable cycling performance (keep 88.8 % specific capacitance after 500 cycles at the same discharge current density) when applied to the supercapacitor electrode materials.

View Article: PubMed Central - PubMed

Affiliation: Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 388 Lumo RD, Wuhan, 430074, China, 391856294@qq.com.

ABSTRACT
The high ratio of pyridinic and pyridone N-doped graphene sheets have been synthesized by functionalizing graphene oxide (GO) with different oxygen groups on its surface. The typical N-doped graphene was determined to be ~3-5 layers by transmission electron microscopy (TEM) and atomic force microscopy (AFM), and the nitrogen content was measured as 6.8-8 at. % by X-ray photoelectron spectroscopy (XPS). The structure of the N-doped graphene with different surface functional groups was characterized by Raman spectroscopy. The research result indicates that the carboxylation of GO is the key factor to obtain pyridinic and pyridone N types during the N atom doping process. Compared to general N-doped graphene, the electrochemical test shows that specific capacitance of the GO-OOH-N sample reaches up to 217 F/g at a discharge current density 1 A/g and stable cycling performance (keep 88.8 % specific capacitance after 500 cycles at the same discharge current density) when applied to the supercapacitor electrode materials.

No MeSH data available.