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Interconnecting Carbon Fibers with the In-situ Electrochemically Exfoliated Graphene as Advanced Binder-free Electrode Materials for Flexible Supercapacitor.

Zou Y, Wang S - Sci Rep (2015)

Bottom Line: The low surface area of CC and the presence of big gaps (ca. micro-size) between individual CFs lead to poor performance.The in-situ electrochemical intercalation technique ensures the low contact resistance between electrode (graphene) and current collector (carbon cloth) with enhanced conductivity.The as-prepared electrode materials show significantly improved performance for flexible supercapacitors.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China [2] School of Chemistry, The University of Manchester, Oxford Road, Greater Manchester, M13 9PL, United Kingdom.

ABSTRACT
Flexible energy storage devices are highly demanded for various applications. Carbon cloth (CC) woven by carbon fibers (CFs) is typically used as electrode or current collector for flexible devices. The low surface area of CC and the presence of big gaps (ca. micro-size) between individual CFs lead to poor performance. Herein, we interconnect individual CFs through the in-situ exfoliated graphene with high surface area by the electrochemical intercalation method. The interconnected CFs are used as both current collector and electrode materials for flexible supercapacitors, in which the in-situ exfoliated graphene act as active materials and conductive "binders". The in-situ electrochemical intercalation technique ensures the low contact resistance between electrode (graphene) and current collector (carbon cloth) with enhanced conductivity. The as-prepared electrode materials show significantly improved performance for flexible supercapacitors.

No MeSH data available.


Related in: MedlinePlus

High resolution C1s XPS peak of CC and Ex-CC.
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f3: High resolution C1s XPS peak of CC and Ex-CC.

Mentions: In order to monitor the change of the C bond configuration, fine-scan C1s spectra were collected from both CC and Ex-CC, as shown in Fig. 3. For CC as a typical carbon material, the C1s XPS peak could be fitted into two peaks, located around 284.6 and 285.3‚ÄČeV, assigned to sp2 and sp3 C1s, respectively24. After the electrochemical intercalation, the sub-peak of sp3 C of Ex-CC increased relative to the pristine CC, indicating more edge defects exposed after exfoliation, in consistent with the observation of the Raman spectra as discussed above. It should be pointed out that no obvious oxygen-containing species were observed for Ex-CC, indicating the electrochemical cation intercalation is a non-oxidative route, which preserved the highly conductive properties of graphene.


Interconnecting Carbon Fibers with the In-situ Electrochemically Exfoliated Graphene as Advanced Binder-free Electrode Materials for Flexible Supercapacitor.

Zou Y, Wang S - Sci Rep (2015)

High resolution C1s XPS peak of CC and Ex-CC.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493559&req=5

f3: High resolution C1s XPS peak of CC and Ex-CC.
Mentions: In order to monitor the change of the C bond configuration, fine-scan C1s spectra were collected from both CC and Ex-CC, as shown in Fig. 3. For CC as a typical carbon material, the C1s XPS peak could be fitted into two peaks, located around 284.6 and 285.3‚ÄČeV, assigned to sp2 and sp3 C1s, respectively24. After the electrochemical intercalation, the sub-peak of sp3 C of Ex-CC increased relative to the pristine CC, indicating more edge defects exposed after exfoliation, in consistent with the observation of the Raman spectra as discussed above. It should be pointed out that no obvious oxygen-containing species were observed for Ex-CC, indicating the electrochemical cation intercalation is a non-oxidative route, which preserved the highly conductive properties of graphene.

Bottom Line: The low surface area of CC and the presence of big gaps (ca. micro-size) between individual CFs lead to poor performance.The in-situ electrochemical intercalation technique ensures the low contact resistance between electrode (graphene) and current collector (carbon cloth) with enhanced conductivity.The as-prepared electrode materials show significantly improved performance for flexible supercapacitors.

View Article: PubMed Central - PubMed

Affiliation: 1] State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China [2] School of Chemistry, The University of Manchester, Oxford Road, Greater Manchester, M13 9PL, United Kingdom.

ABSTRACT
Flexible energy storage devices are highly demanded for various applications. Carbon cloth (CC) woven by carbon fibers (CFs) is typically used as electrode or current collector for flexible devices. The low surface area of CC and the presence of big gaps (ca. micro-size) between individual CFs lead to poor performance. Herein, we interconnect individual CFs through the in-situ exfoliated graphene with high surface area by the electrochemical intercalation method. The interconnected CFs are used as both current collector and electrode materials for flexible supercapacitors, in which the in-situ exfoliated graphene act as active materials and conductive "binders". The in-situ electrochemical intercalation technique ensures the low contact resistance between electrode (graphene) and current collector (carbon cloth) with enhanced conductivity. The as-prepared electrode materials show significantly improved performance for flexible supercapacitors.

No MeSH data available.


Related in: MedlinePlus