The effect of rapid functionalization on the structural and electrochemical properties of high-purity carbon nanotubes

Steimecke, Matthias; Rümmler, Stefan; Bron, Michael

doi:10.1016/j.electacta.2015.02.142

Cited by 23 publications

(18 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, on the other hand it has recently been shown, that at least in case of porous electrodes, these values may not necessarily reflect activity, but may also be influenced by porosity, surface area, double layer capacity, etc. . To overcome this challenge, we have recently developed an SECM (scanning electrochemical microscope) procedure, which however is difficult to apply to the present 3‐dimensional samples.…”

Section: Resultsmentioning

confidence: 99%

Titanium as a Substrate for Three‐Dimensional Hybrid Electrodes for Vanadium Redox Flow Battery Applications

Fan

Steimecke

et al. 2020

ChemElectroChem

Self Cite

View full text Add to dashboard Cite

Titanium, either in the form of a Ti foil or in form of a Ti mesh, was used as a novel substrate to grow nitrogen‐doped carbon nanotubes (NCNTs) through chemical vapor deposition at moderate temperatures over electrodeposited iron particles. The thus‐prepared high‐surface‐area electrodes were characterized by scanning electron microscopy (SEM), Raman spectroscopy, and X‐ray photoelectron spectroscopy (XPS). The electrochemical performance towards the V(IV)/V(V) redox couple was investigated by cyclic voltammetry. The parameters for iron particle electrodeposition were adjusted towards high and uniform substrate coverage. Nanotube growth from acetonitrile at moderate temperatures (600 °C) led to N‐containing CNTs with a high amount of graphitic nitrogen. NCNTs grown over Ti substrates provide promising performances towards the V(IV)/V(V) as well as the V(III)/V(IV) redox pair. In general, the results of this study show that Ti might be a suitable electrocatalyst substrate for various applications in electrochemical energy conversion.

show abstract

Section: Resultsmentioning

confidence: 99%

Titanium as a Substrate for Three‐Dimensional Hybrid Electrodes for Vanadium Redox Flow Battery Applications

Fan

Steimecke

et al. 2020

ChemElectroChem

Self Cite

View full text Add to dashboard Cite

show abstract

“…Between 0.0 V and 0.7 V samples with higher oxygen content (i. e. NASA, PP_02) show broad, ill‐defined redox peaks which are attributed to a pseudocapacity caused by quinone‐type functional groups . These features get less pronounced with decreasing oxygen content until they vanish in the HP_10 and CNT_800 samples, which is in accordance to prior CV measurements of the same samples in 0.1 M HClO 4 . This quinone‐type redox peak is a good measure of the degree of functionalization and may be used for quantification as displayed in Figure b, black squares.…”

Section: Resultsmentioning

confidence: 99%

“…High‐purity carbon nanotubes (Baytubes ® C 150P) were functionalized using a microwave oven and different oxidation reagents, such as nitric acid (NA), hydrogen peroxide (HP), mixtures of both (NAHP), a mixture of nitric and sulfuric acid (NASA) and potassium permanganate solution (PP), respectively. Except for the NASA sample, the detailed preparation procedures can be found in a previous work . The NASA sample was prepared analogously to the other samples using a mixture containing 5.1 M nitric and 9 M sulfuric acid applied for one hour of continuous microwave heating (800 W) and the same washing and drying procedures as described previously.…”

Section: Methodsmentioning

confidence: 99%

A Comparative Study of Functionalized High‐Purity Carbon Nanotubes towards the V(IV)/V(V) Redox Reaction Using Cyclic Voltammetry and Scanning Electrochemical Microscopy

et al. 2016

Self Cite

View full text Add to dashboard Cite

Functionalized high purity carbon nanotubes (CNTs) with various amounts of oxygen containing surface groups were investigated towards the relevant redox reactions of the all‐vanadium redox flow battery. The quinone/hydroquinone redox peaks between 0.0 and 0.7 V vs. Ag|AgCl|KClsat. were used to quantifying the degree of functionalization and correlated to XPS results. Cyclic voltammetry in vanadyl sulfate‐containing 3 M H2SO4 as a common supporting electrolyte showed no influence of the amount of surface groups on the V(IV)/V(V) redox system. In contrast, the reactions occurring at the negative electrode (V(II)/V(III) and V(III)/V(IV)) are strongly affected by oxygen surface groups. However, under modified experimental conditions, SECM experiments detecting the consumption of VO2+ molecules by CNT thin films in pH=2 solution show improved onset potentials with increased surface oxygen content up to ∼ 3 at%. Further increase in surface oxygen up to 8 at% led to minor improvement. These dissimilar results under different experimental conditions are rationalized by suggesting that oxygen functional groups do not form the active site for the V(IV)/V(V) reaction but wetting of the catalyst layer is of high importance.

show abstract

“…Two banding energies at 284 eV and 532 eV could be clearly observed in the XPS spectrum of the control cotton fabric (Fig. 8), which belong to C1s and O1s, respectively [21]. Compared with Fig.…”

Section: Xps and Edx Analysesmentioning

confidence: 95%

Fabrication of superhydrophobic fluorine-free films on cotton fabrics through plasma-induced grafting polymerization of 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane

Zhang

Shao

et al. 2015

Surface and Coatings Technology

View full text Add to dashboard Cite

The effect of rapid functionalization on the structural and electrochemical properties of high-purity carbon nanotubes

Cited by 23 publications

References 38 publications

Titanium as a Substrate for Three‐Dimensional Hybrid Electrodes for Vanadium Redox Flow Battery Applications

Titanium as a Substrate for Three‐Dimensional Hybrid Electrodes for Vanadium Redox Flow Battery Applications

A Comparative Study of Functionalized High‐Purity Carbon Nanotubes towards the V(IV)/V(V) Redox Reaction Using Cyclic Voltammetry and Scanning Electrochemical Microscopy

Fabrication of superhydrophobic fluorine-free films on cotton fabrics through plasma-induced grafting polymerization of 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane

Contact Info

Product

Resources

About