Electrochemical Performance of Graphene as Effected by Electrode Porosity and Graphene Functionalization

Punckt, Christian; Pope, Michael A.; Li, Jun; Lin, Yuehe; Aksay, İlhan A.

doi:10.1002/elan.201000367

Cited by 101 publications

(106 citation statements)

References 55 publications

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“…Particularly in the case of nanomaterials such as carbon nanotubes and graphenes, porosity can result in possible occurrences of thin-layer diffusion and/or adsorption effects [1,10,11,14,[20][21][22] due to internal pore structures and the concomitant surface area increase [23]. However, there also remains uncertainty over the general extent to which porosity (as an extrinsic property) can influence experimental data, and which may consequently result in erroneous interpretations of apparent enhancements arising from intrinsic material properties.…”

Section: Accepted Manuscriptmentioning

confidence: 92%

Intrinsic electrochemical performance and precise control of surface porosity of graphene-modified electrodes using the drop-casting technique

Eng

Chua

Pumera

2015

Electrochemistry Communications

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Section: Accepted Manuscriptmentioning

confidence: 92%

Intrinsic electrochemical performance and precise control of surface porosity of graphene-modified electrodes using the drop-casting technique

Eng

Chua

Pumera

2015

Electrochemistry Communications

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“…43Ϫ45 Our electrode-coating process results in FGS films that are highly porous. 42 As seen in the scanning electron microscope (SEM) images of Figure 9, adjusting the number of oxygen-containing functional groups on FGSs alters the drying dynamics of the material and results in different FGS packing. At a low C/O ratio, the material forms an open, layered structure with pores on the micrometer scale.…”

mentioning

confidence: 99%

“…Thus, based on the different morphologies of the FGS films, it is reasonable to expect that electrodes made from different types of FGS may exhibit different porosity. 42 We use CV to analyze how increasing the loading of FGS 13 influences the apparent catalytic activity of the material. Our CV data support the predictions of the theoretical models on the role of porosity.…”

mentioning

confidence: 99%

Functionalized Graphene as a Catalytic Counter Electrode in Dye-Sensitized Solar Cells

et al. 2010

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When applied on the counter electrode of a dye-sensitized solar cell, functionalized graphene sheets with oxygen-containing sites perform comparably to platinum (conversion efficiencies of 5.0 and 5.5%, respectively, at 100 mW cm ؊2 AM1.5G simulated light). To interpret the catalytic activity of functionalized graphene sheets toward the reduction of triiodide, we propose a new electrochemical impedance spectroscopy equivalent circuit that matches the observed spectra features to the appropriate phenomena. Using cyclic voltammetry, we also show that tuning our material by increasing the amount of oxygen-containing functional groups can improve its apparent catalytic activity. Furthermore, we demonstrate that a functionalized graphene sheet based ink can serve as a catalytic, flexible, electrically conductive counter electrode material.

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“…No relevant interactions were observed when the NADH and NAD + were on the basal plane of graphene or close to hydrogen-only substituted edges of graphene sheets, which revealed the role of oxygenated species of graphene in molecule interaction. This was evidenced by a recent research that functionalized graphene with low C/O ratio caused a decrease of the overpotential for the electrochemical oxidation of NADH [19]. The oxygen functional groups and lattice defects of graphene played a prominent role on the electrochemical activity.…”

Section: Nadhmentioning

confidence: 86%

Graphene for Detection of Adenosine Triphosphate, Nicotinamide Adenine Dinucleotide, Other Molecules, Gas, and Ions

Han

et al. 2014

SpringerBriefs in Molecular Science

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Graphene-based electrochemical aptasensing platforms have been rapidly developed to detect different targets by combining various electrochemical techniques with aptamer-based signal conversion strategies. Electrochemical aptasensor for adenosine triphosphate (ATP) detection was recently realized by using functionalized graphene nanosheets. Nicotinamide adenine dinucleotide (NADH) is involved as a cofactor in hundreds of enzymatic reactions of NAD + /NADHdependent dehydrogenases. The mechanism of NADH oxidation was thoroughly studied on graphene platform. Graphene sheets also serve as good substrates for detection of various other molecules, including acetylcholine/choline, cholesterol, benzenediol isomers (hydroquinone, resorcinol, and catechol), and epinephrine. The unique structure and oxygenic functionalities of GO facilitate it to be easily turned into a potentially useful gas storage material and biological ionic and molecular channels. Functionalized nanopores in graphene monolayers were designed and used as ionic sieves with high selectivity and transparency. Some cations, such as Li Keywords Graphene Á Adenosine triphosphate Á Nicotinamide adenine dinucleotide Á Gas sensor Á Ion-selective sensor ATPAdenosine triphosphate (ATP), as the major carrier of chemical energy in living species, is an important substrate in living organisms, which plays a critical role in the regulation and integration of cellular metabolism. In addition, it has also been used as an indicator for cell viability and cell injury [1]. Therefore, the detection of ATP is highly important in biochemical study and clinic diagnosis. Electrochemical aptasensor represents an attractive choice, which is simple, rapid, and allows device miniaturization. Until now, graphene-based electrochemical aptasensing platforms

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Electrochemical Performance of Graphene as Effected by Electrode Porosity and Graphene Functionalization

Cited by 101 publications

References 55 publications

Intrinsic electrochemical performance and precise control of surface porosity of graphene-modified electrodes using the drop-casting technique

Intrinsic electrochemical performance and precise control of surface porosity of graphene-modified electrodes using the drop-casting technique

Functionalized Graphene as a Catalytic Counter Electrode in Dye-Sensitized Solar Cells

Graphene for Detection of Adenosine Triphosphate, Nicotinamide Adenine Dinucleotide, Other Molecules, Gas, and Ions

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