Surface modification of MnO2 and carbon nanotubes using organic dyes for nanotechnology of electrochemical supercapacitors

Wang, Yaohui; Liu, Yangshuai; Zhitomirsky, Igor

doi:10.1039/c3ta12458d

Cited by 52 publications

(36 citation statements)

References 59 publications

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“…Nearly box shape CVs were recorded at scan rates as high as 200 mV s À1 . In contrast, MnO 2 eMWCNT electrodes [14] showed poor capacitive behavior even at lower scan rates, such as 100 mV s À1 . The increase in scan rate resulted in increasing current, indicating good capacitive behavior (Fig.…”

Section: Resultsmentioning

confidence: 93%

“…The electrodes showed (Fig. 3B) a capacitance of 6.0 F cm À2 (540 F cm À3 ) at a scan rate of 2 mV s À1 , which is higher than that achieved for MnO 2 eMWCNT electrodes, using the same current collectors [14]. The capacitance of BiMn 2 O 5 component of the composite was found to be 595 F cm À3 .…”

Section: Resultsmentioning

confidence: 96%

“…Such dispersants show good adsorption on MWCNT due to the pep interactions and allow electrosteric dispersion [14,39]. On the other hand, the catechol ligands of such dispersants provide their strong adsorption on metal oxide nanoparticles due to the complex formation between the catechol ligand of the dispersant and metal atoms on the particle surface [14,40]. Recent review [40] described fundamental aspects of the adsorption of different dispersants from the catechol family.…”

Section: Resultsmentioning

confidence: 98%

“…Especially attractive is approach, based on the use of polyaromatic charged dispersants from the catechol family [39]. Such dispersants show good adsorption on MWCNT due to the pep interactions and allow electrosteric dispersion [14,39]. On the other hand, the catechol ligands of such dispersants provide their strong adsorption on metal oxide nanoparticles due to the complex formation between the catechol ligand of the dispersant and metal atoms on the particle surface [14,40].…”

Section: Resultsmentioning

confidence: 98%

“…The voltage window of single BiMn 2 O 5 eMWCNT electrodes was the same as voltage window of single MnO 2 eMWCNT electrodes, investigated in Ref. [14]. Nearly box shape CVs were recorded at scan rates as high as 200 mV s À1 .…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical supercapacitor based on multiferroic BiMn 2 O 5

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Section: Resultsmentioning

confidence: 93%

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Electrochemical supercapacitor based on multiferroic BiMn 2 O 5

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Zhitomirsky

2015

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The Development of Pseudocapacitor Electrodes and Devices with High Active Mass Loading

Chen

Sahu

et al. 2020

Advanced Energy Materials

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Pseudocapacitive materials are used for supercapacitor applications due to their exceptionally high capacitance and low cost. Good capacitive performance of the pseudocapacitive materials at high active mass loadings is vital for the development of the next generation of supercapacitor devices. This review describes recent advances in materials and nanotechnologies, which allows the development of advanced pseudocapacitive devices with high active mass. An important breakthrough is the discovery of novel dispersing and capping agents for the colloidal processing of nanoparticles. Particularly important are novel co‐dispersants that exhibit enhanced adsorption on materials of different types, such as inorganic nanoparticles, carbon nanotubes, and graphene. Conceptually new strategies are designed to fabricate coated particles. Recent innovations pave the way for the development of multifunctional redox‐active dopants‐dispersants and dopants‐oxidants to manufacture conductive polymer composites. Among the most important advances in nanotechnology is the development of template methods and heterocoagulation techniques for composite manufacturing. The progress in the design of novel surface modification techniques and materials, discovery of advanced anchoring groups, and development of liquid–liquid extraction allows agglomerate‐free processing of nanomaterials and composites. This review describes fundamental aspects of novel technologies and their applications in the manufacturing of pseudocapacitive devices for energy storage.

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Asymmetric Supercapacitors Based on Activated‐Carbon‐Coated Carbon Nanotubes

Shi

Zhitomirsky

2015

ChemElectroChem

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A new method is developed for the fabrication of asymmetric supercapacitor devices containing fibrous electrode materials. The approach is based on the synthesis of uniform polypyrrole (PPy) coatings on multiwalled carbon nanotubes (MWCNT), which were used for the fabrication of MWCNTs coated with N‐doped activated carbon (N‐AC). The N‐AC‐MWCNT electrodes show good electrochemical performance in positive and negative potential windows. The electrochemical performance of positive electrodes is further enhanced by the development of MnO2‐coated N‐AC‐MWCNT. In this approach, the problem of MWCNT degradation in the reaction with KMnO4 is avoided by the use of a sacrificial N‐AC layer, which allows a relatively high mass content of MnO2 in the final material. The approach offers the advantages of small size of MnO2 nanoparticles, good electrical contact of MnO2 and MWCNT and fibrous microstructure of the material. Testing results show a remarkably high specific capacitance of 6.29 F cm−2 (311.7 F g−1) at a mass loading of 20 mg cm−2. The important finding is the possibility to fabricate asymmetric devices, which show a specific capacitance of 2.19 F cm−2 (62.7 F g−1) in a voltage window of 1.9 V in aqueous Na2SO4 electrolyte, an energy density of 26.4 mWh g−1 and a power density of 1.7 W g−1. The electrodes and devices show good capacitance retention at high charge–discharge rates and good cycling stability. The asymmetric capacitors developed herein are promising for practical energy‐storage applications.

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Surface modification of MnO2 and carbon nanotubes using organic dyes for nanotechnology of electrochemical supercapacitors

Cited by 52 publications

References 59 publications

Electrochemical supercapacitor based on multiferroic BiMn 2 O 5

Electrochemical supercapacitor based on multiferroic BiMn 2 O 5

The Development of Pseudocapacitor Electrodes and Devices with High Active Mass Loading

Asymmetric Supercapacitors Based on Activated‐Carbon‐Coated Carbon Nanotubes

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