Electrochemical tuning of capacitive response of graphene oxide

Gutić, Sanjin J.; Kozlica, Dževad K.; Korać, Fehim; Bajuk‐Bogdanović, Danica; Mitrić, Miodrag; Mirsky, Vladimir M.; Mentus, Slavko; Pašti, Igor A.

doi:10.1039/c8cp03631d

Cited by 14 publications

(12 citation statements)

References 59 publications

(81 reference statements)

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“…The band associated with defects in ZnO (e.g., oxygen vacancies) at 580 cm −1 indicates the hybridization of ZnO with GO and shows that at a higher GO content (i.e., 10 mg L −1 ), the hybridization reaches a limitation as it did not change in location or full width half maximum. The peaks corresponding to GO indicate that the I D /I G ratio is relatively higher at −1.0 V than lower applied deposition potentials, which is attributed to an increased reduction degree [23,28,47,[53][54][55].…”

Section: The Chronoamperometric Curves Inmentioning

confidence: 99%

Graphene Oxide-Assisted Morphology and Structure of Electrodeposited ZnO Nanostructures

et al. 2020

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In this paper, ZnO electrodeposition was studied with the presence of graphene oxide (GO) exploited as a possible structure-directing agent. The effect of deposition potential and duration on the morphology and structure of ZnO was analyzed. The morphology and structure of the hybrids was analyzed by Raman spectroscopy, X-ray diffraction (XRD), and Scanning Electron Microscopy (SEM). The Raman results indicate a successful modification of ZnO with GO sheets and a hybridization threshold of 10 mg L−1 by the evolution of the defect related band of ZnO at 580 cm−1. The morphology results show that a low GO content only slightly influences the morphology and orientation of ZnO nanostructures while a high content as 10 mg L−1 changes the morphology in nanoplates and growth orientation to lateral. The results show that while GO participated in the deposition reaction, it has a two-fold role, also by structure-controlling ZnO, indicating that the approach is valid for the use of GO as a structure-directing agent for the fabrication of ZnO nanostructures by electrodeposition with varying morphologies and orientations.

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Section: The Chronoamperometric Curves Inmentioning

confidence: 99%

Graphene Oxide-Assisted Morphology and Structure of Electrodeposited ZnO Nanostructures

et al. 2020

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“…1 (bottom panel) it can be observed that the CIFs are significantly lower when conductive additive is used. As previously explained [19] this is not a negative effect of the conductive carbon added to the GO layer, but the consequence of higher initial GO capacitances due to a higher conductivity of the GO/conductive component film. Namely, we measured the initial specific capacitances (i.e.…”

Section: (Top Panel)mentioning

confidence: 53%

“…The GO sample used in this work possesses high concentration of oxygen functional groups (C:O ratio close to 1) and a small concentration of heteroatoms (S and N). Due to high oxidation degree it is non conductive, as known for GO [19,23]. It undergoes irreversible electrochemical reduction, which is observed under both potentiodynamic and potentiostatic conditions.…”

Section: Resultsmentioning

confidence: 99%

“…Number of different experimental conditions and their effects on the reduction process and the properties of final reduced GO (rGO) can be found in literature [15][16][17][18][19][20][21]. 3 Recently, we have shown general trends in tuning capacitive properties of GO [19]. As GO is reduced it gets de-oxygenated, while its conductivity increases.…”

Section: Introductionmentioning

confidence: 99%

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When supporting electrolyte matters – Tuning capacitive response of graphene oxide via electrochemical reduction in alkali and alkaline earth metal chlorides

Karačić

Korać

Dobrota

et al. 2019

Electrochimica Acta

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The ability to tune charge storage properties of graphene oxide (GO) is of utmost importance for energy conversion applications. Here we show that electrochemical reduction of GO is highly sensitive to the cations present in the solution. GO is reduced at lower potential in alkali metal chloride solutions than in alkaline earth metal chlorides. During the reduction, capacitance of GO increases from 10 to 70 times. Maximum capacitances of reduced GO are between 65 and 130 F g −1 , depending on the electrolyte and the presence of conductive additive. We propose that different interactions of cations with oxygen functional groups of GO during the reduction are responsible for the observed effect.

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“…The current value was improved to 23 µ A for rGO/SPCEs owing to the electrochemical reduction process that removed a considerable number of oxygenated functional groups. Studies have shown that electrochemical reduction with precise control over the reduction potential and time [11,12] allows reproducibility of rGO for use in electrochemical devices [13]. We found that IgG/rGO/SPCEs achieved the highest current value of 73 µA, which could be due to the semiconductive nature of protein in dry and wet states [14].…”

Section: Linear Sweep Voltammetry For Bare Spces Go/spces Rgo/spces and Igg/rgo/spcesmentioning

confidence: 76%

Reduced Graphene Oxide on Screen-Printed Carbon Electrodes as Biosensor for Escherichia coli O157:H7 Detection

Barthasarathy

Salim

2020

The 1st International Electronic Conference on Biosensors

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Mixture of drinking-water supplies with sewage discharges poses disease threats in flood-stricken areas. In such exigent conditions, on-site testing of water samples is the only option, as water samples cannot be transported to laboratories owing to severely impacted transportation services. Hence, we developed a low-cost electrochemical biosensor fabricated from a screen-printed carbon electrode (SPCE) to detect E. coli O157:H7, a virulent pathogen often found in sewage discharges. We focused on understanding antigen-antibody interaction when the antibody used is not specific for E. coli O157:H7. We found that antibody immobilized on a reduced graphene oxide (rGO)–modified SPCEs distinguished between E. coli O157:H7 concentrations of 4 × 108 and 4 CFU/ml, with lowest current reported for 4 × 108 CFU/ml. In contrast, a reduced graphene oxide–modified SPCEs without antibody immobilization does not produce a prominent peak that distinguishes the highest and lowest E. coli concentrations. However, a few E. coli cells were still attached to the rGO/SPCEs in the absence of antibody, as shown in FESEM images. A processing step of differential readings from reference and active electrodes needs to be programmed into an Arduino® microprocessor to realize a prototype of a bacteria sensor for field use.

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Electrochemical tuning of capacitive response of graphene oxide

Cited by 14 publications

References 59 publications

Graphene Oxide-Assisted Morphology and Structure of Electrodeposited ZnO Nanostructures

Graphene Oxide-Assisted Morphology and Structure of Electrodeposited ZnO Nanostructures

When supporting electrolyte matters – Tuning capacitive response of graphene oxide via electrochemical reduction in alkali and alkaline earth metal chlorides

Reduced Graphene Oxide on Screen-Printed Carbon Electrodes as Biosensor for Escherichia coli O157:H7 Detection

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