Carbon nanotube voltammograms

Figure 1. Cyclic voltammograms at 2mV/s in 2 mol.L 1 KNOs medium for two-electrode capacitors based on a-Mn02 nH20 loaded with 15 wt% of carbon black or carbon nanotubes.

Figure 3. Cyclic voltammograms in three-electrode cells for activated carbon andfor a-MnC>2 nH20 loaded with 15wt% of carbon nanotubes in 2 molL 1 KNO3 medium using Pt as...

C C.ImllBFJ Acid-treated multiwalled carbon nanotube GCE Hemin, Hb horseradish peroxidase H2O2 NR NR Cyclic voltammograms 34 s S ... 

Figure 3.4 Differential pulse voltammograms with correction of background current for (a) 0.4 mM ascorbic acid, (b) 0.4 mM ascorbic acid + 0.05 mM dopamine, and (c) 0.4 mM ascorbic acid + 0.05 mM dopamine + 0.05 mM uric acid at a multiwalled carbon nanotube-ionic liquid/GC electrode. The total weight of the gel on the multiwalled carbon nanotube-ionic liquid modified electrode is 0.1 mg. Scan rate = 20 mVs. (Reprinted from Zhao, Y., Gao, Y., Zhan, D., Liu, H., Zhao, Q., Kou, Y., Shao, Y., Li, M., Zhuang, Q., and Zhu, Z., Talanta, 51-57, 2005. Copyright 2005 Elsevier. With permission.)...

This is mainly due to their laborious purification procedures and their required chemical modification for solubilization. Only recently, Prato et al. reported the electrochemistry of carbon nanotubes functionalized using the 1,3-dipolar cycloaddition reaction.120 The cyclic voltammogram obtained is shown in Fig. 8.9. 

The cyclic voltammograms of these soluble assemblies show a behavior similar to that previously observed by Prato et al.121, that is, a continuum of cathodic current with the reduction onset voltage of —0.15 V versus SCE. Recently, Paolucci et al. were able to obtain the electrochemistry of reduced unfunctionalized carbon nanotubes that were solubilized by reduction with alkali metals to their respective polyelectrolyte salts.122... 

Figure 7. Cyclic voltammograms of three different structures of MPS modified carbon nanotubes paste electrodes in 5 mM K3[Fe(CN)6] and 0.5 M KC1, scan rate 50 mV s"1 (unpublished data from author s laboratory).

Fig. 4.1 Cyclic voltammogram showing zinc deposition and de-plating for carbon black (green line) and multiwall carbon nanotube-embedded (orange line) high-density polyethylene composite electrodes, with deposition potential (DP), cross-over potential (COP) and nucleation overpotential (NOP) indicated on diagram inset (Image adapted from [3].)...

Fig. 6.21 Linear sweep voltammograms recorded at modified glassy carbon electrodes in 5.0 pM NO2, 0.1 M phosphate buffer solution 0.1 Vs potential scan rate. Different electrode coatings have been considered a) carbon nanotubes (CNTs), b) CNTs-Chit, (c) OMIMPF6-CNT-Chit d) (OMIMPFg-CNT) gel, e) (OMIMPFg-CNT) gel-Chit (Chit chitosan OMIMPFe l-octyl-3-methylimidazolium hexafluorophosphate) (Adapted with permission of the authors. Reproduced from Ref. [221] with the permission of Wiley)...

Figure 20.13. Cyclic voltammograms of the (a) AOl, A02, BOl, and (b) B02 and J-M specimens at 20 mV s-1 in N2-saturated 0.5 M H2SO4+ 1 M CH3OH aqueous solutions. The electrochemical tests were conducted under ambient pressure and a controlled temperature of 30 C and the CV curves were taken from the fifth cycle [64]. (Reproduced from Electrochemistry Communications, 8(9), Tsai MC, Yeh TK, and Tsai CH, An improved electrodeposition technique for preparing platinum and platinum-ruthenium nanoparticles on carbon nanotubes directly grown on carbon cloth for methanol oxidation, 1445-52, 2006, with permission from Elsevier.)...

Fig. 2.35 a Cyclic and b differential pulse voltammograms of 0.1 mM ascorbic acid and 0.1 mM acetaminophen in acetate buffer solution (0.1 M, pH 4.0) on the surface of various electrodes unmodified carbon paste electrode (solid line), CNT-carbon paste electrode (dotted line) and multi-walled carbon nanotube/thionine modified electrode (dashed line). Sweep rate was 100 mV s. Reproduced from Ref. [19] with permission of Elsevier... 

FIGURE 13.7 Preparation and characterization of single-walled nanotube (SWNT) forest formed by metal-assisted deposition of oxidized, shortened SWNTs. (a) Schematic representation of SWNT forest preparation. Shortened, open-ended SWNTs with carboxyl-functionalized ends are produced by oxidation of SWNTs. A suspension of SWNTs is introduced to a metal surface functionalized with iron hydroxides. An SWNT forest results as SWNTs vertically align via self-assembly. (Part a adapted with permission from Chattopadhyay, D., Galeska, I., and Papadimitrakopoulos, F., Metal-assisted organization of shortened carbon nanotubes in monolayer and multilayer forest assemblies, J. Am. Chem. Soc., 123,9451-9452,2001. Copyright 2001 American Chemical Society.) Cyclic voltammograms (scan rate 300 mV s ) of (b) SWNT forest electrodes in pH 5.5 buffer with and without 0.2 mM HjOj. (Continued)... 

FIGURE 3.4 Dlustration of MCO immobilized onto PBSE-modified carbon nanotubes (a) and cyclic voltammograms (b) of laccase (i) and BOx (ii) modified electrodes. MCO physisorbed to carbon (1) and carbon/ MWCNT (2). MCO immobilized via PBSE to carbon/MWCNT with oxygen (3) and nitrogen (4). CV scans in phosphate buffer (pH 5.8), scan rate lOmV s . (Adapted with permission from Ref. [52]. Copyright 2010, Royal Society of Chemistry.)... 

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