Electrochemical modification of electrodes based on highly oriented carbon nanowalls

Krivenko, A. G.; Komarova, N. S.; Stenina, E. V.; Sviridova, L. N.; Mironovich, K. V.; Shul’ga, Yu. M.; Manzhos, R. A.; Doronin, Sergey V.; Кривченко, В. А.

doi:10.1134/s1023193515100079

Cited by 9 publications

(12 citation statements)

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“…At the same time, borneol adsorption on the edge regions seemed to be more hampered. This assumption is in a good agreement with the conclusions [8,9] about the mechanism of surfactant influence on the kinetics of redox processes on CNW electrodes.…”

Section: Figure 2 the Dependence Of The Electron Number Involved In The Oxygen Reduction On Initial Cnws On The Electrode Potential Slikasupporting

confidence: 90%

“…After covalent modification of CNWs, the limiting current increases (curve 2) ca 1.4 times. Electrochemical functionalization of CNWs used in the current study was shown [8,9] to result in increase in the number of oxygen-containing functional groups preferentially located on the edges of nanowalls ([O/C] at atomic ratio is 0.02-0.03 and 0.14 for the initial and modified CNWs respectively). Moreover, there was a partial splitting of nanowalls [8,9].…”

Section: Figure 2 the Dependence Of The Electron Number Involved In The Oxygen Reduction On Initial Cnws On The Electrode Potential Slikamentioning

confidence: 80%

“…Electrochemical functionalization of CNWs used in the current study was shown [8,9] to result in increase in the number of oxygen-containing functional groups preferentially located on the edges of nanowalls ([O/C] at atomic ratio is 0.02-0.03 and 0.14 for the initial and modified CNWs respectively). Moreover, there was a partial splitting of nanowalls [8,9]. It is important to note that the data of Raman spectroscopy did not reveal an increase in the defectiveness of the CNW basal planes after functionalization.…”

Section: Figure 2 the Dependence Of The Electron Number Involved In The Oxygen Reduction On Initial Cnws On The Electrode Potential Slikamentioning

confidence: 80%

“…[11]), the limiting current of the wave corresponds to the two-electron oxygen reduction to H 2 O 2 . [8]). Skala je 500 nm.…”

Section: Resultsmentioning

confidence: 99%

“…A noncovalent modification was an adsorption of borneol (an organic surfactant with two-dimensional structure). Both types of modification are described in detail in [8,9] where a study of reversible redox-systems on initial and modified CNWs was perfomed by means of cyclic voltammetry.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen reduction reaction on covalently and noncovalently modified carbon nanowalls

Krivenko¹,

Manzhos²,

Lutovac³

et al. 2018

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An effect of highly oriented carbon nanowalls modification on oxygen reduction reaction was studied by means of a rotating disk electrode. Namely nanowalls were modified with oxygencontaining functional groups. Moreover, an adsorption of borneol (a surfactant with twodimensional structure) was considered. Two distinct waves are observed on voltammograms in aerated alkaline solutions that points out to the two-step process of oxygen reduction with the formation of H 2 O 2 as intermediate. Both types of surface modification were found to affect substantially the absolute currents of the waves as well as their ratio. This effect was assumed to be caused by the topology peculiarities of carbon nanowalls that determine the electrochemical heterogeneity of the electrode surface. For initial nanowalls, the process of two-step reduction takes place on the edges of nanowalls. A parallel channel of oxygen reduction with the formation of water is assumed to be realized on the defects of basal planes at high overvoltage. In the case of noncovalent modification, borneol is adsorbed mainly on basal planes of nanowalls and blocks substantially parallel reduction channel. After covalent modification, oxygen reduction proceeds mainly through a two-step channel as a result of the increase in the number of oxygen-containing functional groups (the centers of two-step reduction) on the edges of nanowalls.

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Section: Figure 2 the Dependence Of The Electron Number Involved In The Oxygen Reduction On Initial Cnws On The Electrode Potential Slikasupporting

confidence: 90%

Section: Figure 2 the Dependence Of The Electron Number Involved In The Oxygen Reduction On Initial Cnws On The Electrode Potential Slikamentioning

confidence: 80%

Section: Figure 2 the Dependence Of The Electron Number Involved In The Oxygen Reduction On Initial Cnws On The Electrode Potential Slikamentioning

confidence: 80%

“…[11]), the limiting current of the wave corresponds to the two-electron oxygen reduction to H 2 O 2 . [8]). Skala je 500 nm.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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