A study of glassy carbon electrodes modified with azobenzene derivatives

Kibena, Elo; Mäeorg, Uno; Matisen, Leonard; Sulamägi, Priit; Tammeveski, Kaido

doi:10.1016/j.jelechem.2012.09.017

Cited by 17 publications

(9 citation statements)

References 60 publications

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“…At more negative potentials (~À0.9 V vs. SCE) a second peak is observed in accordance with previous studies [73,80]. Usually, the electrocatalytic activity for ORR is assigned to native quinone-type groups present on the bare GC surface [8,9].…”

Section: Determination Of Surface Concentration Of Aq Groups and Filmsupporting

confidence: 90%

“…For comparative reasons, the bare electrodes are also included in these studies. With GC itself it is well known that the interaction of ferricyanide ions enables a fast heterogeneous electron transfer (Figure 7 A) [68,[73][74][75], while the redox response of the Fe(CN) 6 3À/4À probe on basal plane HOPG is slower (Figure 7 B) [74,76] giving rise to a considerably larger peak-to-peak separation.…”

Section: Determination Of Surface Concentration Of Aq Groups and Filmmentioning

confidence: 99%

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Electrochemical Behaviour of HOPG and CVD‐Grown Graphene Electrodes Modified with Thick Anthraquinone Films by Diazonium Reduction

et al. 2014

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Highly oriented pyrolytic graphite (HOPG) and graphene grown on Ni (Ni‐Gra) or Cu (Cu‐Gra) by chemical vapour deposition were modified with thick anthraquinone (AQ) films (7−60 nm) by redox grafting of the pertinent diazonium salt. Glassy carbon (GC) electrodes were used for comparison. The AQ‐modified GC electrodes showed excellent blocking properties towards the Fe(CN)63−/4− redox probe, although it was noted that in the case of Ni‐Gra and Cu‐Gra, the blocking ability depended strongly on the underlying substrate. Oxygen reduction studies revealed good electrocatalytic activity of AQ‐modified HOPG, Ni‐Gra, and Cu‐Gra, compared with the bare electrodes.

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Section: Determination Of Surface Concentration Of Aq Groups and Filmsupporting

confidence: 90%

Section: Determination Of Surface Concentration Of Aq Groups and Filmmentioning

confidence: 99%

Electrochemical Behaviour of HOPG and CVD‐Grown Graphene Electrodes Modified with Thick Anthraquinone Films by Diazonium Reduction

et al. 2014

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“…Since the ORR electrocatalytic activity of bare GC has been thoroughly studied, some similarities between graphene-based substrates and bare GC can be seen. Namely, according to the literature, bare GC exhibits also two reduction peaks (at about´0.4 and´0.9 V vs. SCE) in alkaline medium [41,[64][65][66], which is in accordance with this study (see Figure 5). The presence of two reduction peaks indicates that the ORR undergoes two processes, both attributed to the two-electron reduction of O 2 to HO 2´.…”

Section: Oxygen Reduction Reaction On Graphene-based Nanomaterialssupporting

confidence: 92%

“…0.1 mA¨cm´2) [70] was determined as ca.´0.2 V for GC/Graphene1, GC/Graphene2, GC/rGO and GC/GO electrodes. This value is higher than for example in case of bare GC (ca.´0.3 V [66]) indicating that the ORR process starts at a higher potential on all these materials than on bare GC, which is also consistent with the LSV results (see Figure 5).…”

Section: Oxygen Reduction Reaction On Graphene-based Nanomaterialssupporting

confidence: 89%

An Oxygen Reduction Study of Graphene-Based Nanomaterials of Different Origin

et al. 2016

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Abstract:The aim of this study is to compare the electrochemical behaviour of graphene-based materials of different origin, e.g., commercially available graphene nanosheets from two producers and reduced graphene oxide (rGO) towards the oxygen reduction reaction (ORR) using linear sweep voltammetry, rotating disc electrode and rotating ring-disc electrode methods. We also investigate the effect of catalyst ink preparation using two different solvents (2-propanol containing OH´ionomer or N,N-dimethylformamide) on the ORR. The graphene-based materials are characterised by scanning electron microscopy, transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. Clearly, the catalytic effect depends on the origin of graphene material and, interestingly, the electrocatalytic activity of the catalyst material for ORR is lower when using the OH´ionomer in electrode modification. The graphene electrodes fabricated with commercial graphene show better ORR performance than rGO in alkaline solution.

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“…For comparative reasons, the bare electrodes are also included in these studies. With GC itself it is well known that the interaction of ferricyanide ions enables a fast heterogeneous electron transfer (Figure 7 A) 68, 73–75, while the redox response of the Fe(CN) 6 3−/4− probe on basal plane HOPG is slower (Figure 7 B) 74, 76 giving rise to a considerably larger peak‐to‐peak separation.…”

Section: Resultsmentioning

confidence: 99%