In Situ Atomic Force Microscopy of Electrochemically Activated Glassy Carbon

Alliata, Dario; Häring, P.; Haas, O.; Kötz, R.; Siegenthaler, H.

doi:10.1149/1.1390725

Cited by 20 publications

(12 citation statements)

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“…The GC ox (Figure 1(b)) exhibits a significant increase in the oxygen signal compared with the bare GC (Figure 1(a)). This observation is clear evidence for the oxidation of GC as previously reported [47][48][49] after being subjected to electrooxidation. In Figures 1(a) and 1(d), the nickel signal appeared as evidence for the deposition of Ni on GC ox .…”

Section: Resultssupporting

confidence: 89%

Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode

et al. 2020

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Electrochemical determination of dopamine (DA) in the presence of a large excess of ascorbic acid (AA) in their coexistence at a nickel oxide nanoparticle-modified preoxidized glassy carbon electrode (GCox/nano-NiOx) is achieved. The GCox/nano-NiOx electrode is prepared by electrodeposition of nickel nanoparticles (nano-Ni) onto an electrochemically activated glassy carbon (GC) electrode, and the thus prepared nano-Ni were subjected to electrochemical oxidation in alkaline medium for the formation of nickel oxide (NiOx). Modified electrodes were electrochemically and morphologically characterized. The effect of loading level of nickel was investigated by changing the number of potential cycles for the deposition of nano-Ni, i.e., 1, 2, 5, and 10 potential cycles, in the potential range from 0 to -1.0 V vs. SCE. Also, the experimental and instrumental parameters were optimized. Experimental results showed that the modified electrode differentiates well the oxidation peaks of DA and AA enabling the electrochemical determination of DA in the presence of a large excess of AA. Remarkably, it is found that the oxidation current of DA is 2 times larger than that of AA even the concentration of AA is about 5 times larger than that of DA. The LOD and LOQ of DA were calculated and were found to equal 0.69 and 2.3 mM, respectively. This offers the advantage of simple and selective detection of DA free of the interference of AA in real samples.

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Section: Resultssupporting

confidence: 89%

Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode

et al. 2020

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“…Interestingly, it is observed from CV curves that there is an increase in the capacitive current for PEFC cathode comprising Pt/MWCNT as cathode electrocatalyst during AST as shown in Figure 4S (SI). This increase in the capacitive current in the CV curve may be attributed to the surface roughening initiated by the surface defects [55,56]. Similar increase in capacitive current was already observed in our previous study, were carbon corrosion occurred along with increase in capacitance [57].…”

Section: Resultssupporting

confidence: 87%

TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

Selvaganesh¹,

Dhanasekaran²,

Bhat³

2017

Electrochemical Energy Technology

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Durability is a major issue and has been the growing focus of research for the commercialization of polymer electrolyte fuel cells (PEFCs). Corrosion of carbon support is a key parameter as it triggers the Pt catalyst degradation and affects cell performance, which in turn affects the longevity of the cells. Herein, we describe a hybrid composite support of TiO 2 -nanowires and Multiwalled carbon nanotubes (MWCNTs) that offers resistance to corrosion under stressful operating conditions. Titania nanowires which have been shown to be more efficient and catalytically active than spherically shaped TiO 2 . TiO 2 -MWCNT composites are prepared through a hydrothermal method, followed by Pt deposition using a polyol method. Crystal structure, morphology, and oxidation state are examined through various characterization techniques. Electrochemical performance of TiO 2 -nanowire/MWCNT composite-supported Pt at various ratios of TiO 2 /MWCNT is assessed in PEFCs. Pt on support with optimum composition of TiO 2 -nanowires to MWCNTs exhibits fuel cell performance superior to Pt on MWCNTs. Accelerated stress testing (AST) between 1 and 1.5 V reveals that the designed catalyst on nanocomposite support possesses superior electrochemical activity and shows only 16% loss in catalytic activity in relation to 35% for Pt/MWCNTs even after 6000 potential cycles. Subsequently, the samples were characterized after AST to correlate the loss in fuel cell performance

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“…Recent research indicated that the chemical and electrochemical pretreatment on the GCE could significantly improve its physical and electrochemical properties 23–25. Till now, this electrochemical pretreatment GCE has never been employed in the ECL research.…”

Section: Introductionsupporting

confidence: 83%

Electrochemiluminescent Behavior of Eosin Y and Its Application for Detection of Some Bioactive Molecules

et al. 2011

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Herein the electrochemiluminescent behavior of a promising and cheap electrochemiluminescence (ECL) luminophore, Eosin yellowish (2',4',5',7'-tetrabromofluorescein, EYH2), was investigated. A stable and strong ECL emission of Eosin yellowish could be achieved at electrochemical pretreated glassy carbon electrode in mild acidic media. Based on proposed stable cathodic ECL of Eosin yellowish on the electrochemically pretreated GCE, some important bioactive molecules, such as H 2 O 2 , guanine, adenine, nicotinamide adenine dinucleotide (NADH), uric acid and vitamin C, were found as enhanced coreactants towards the cathodic ECL of Eosin yellowish.

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In Situ Atomic Force Microscopy of Electrochemically Activated Glassy Carbon

Cited by 20 publications

References 0 publications

Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode

Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode

TiO2-nanowire/MWCNT composite with enhanced performance and durability for polymer electrolyte fuel cells

Electrochemiluminescent Behavior of Eosin Y and Its Application for Detection of Some Bioactive Molecules

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