Electrocatalytic activity of polypyrrole films incorporating palladium particles

Mourato, Ana; Cabrita, Joana F.; Ferraria, Ana Maria; Rego, A.M. Botelho do; Abrantes, L.M.

doi:10.1016/j.cattod.2010.07.004

Cited by 14 publications

(7 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The N 1s region was fitted with two peaks, one centered at a binding energy equal to 399.4 ± 0.2 eV assigned mainly to pyridinic nitrogen 57 , and a minor peak centered at 401.2 ± 0.2 eV, corresponding to graphitic nitrogen 66 . Pyrrolic nitrogen, which is likely to exist in these structures, must be close to 399.9 eV 67 , i.e. between the two fitted components.…”

Section: Resultsmentioning

confidence: 99%

Towards large-scale in free-standing graphene and N-graphene sheets

Tatarova

Dias

Henriques

et al. 2017

Sci Rep

View full text Add to dashboard Cite

One of the greatest challenges in the commercialization of graphene and derivatives is production of high quality material in bulk quantities at low price and in a reproducible manner. The very limited control, or even lack of, over the synthesis process is one of the main problems of conventional approaches. Herein, we present a microwave plasma-enabled scalable route for continuous, large-scale fabrication of free-standing graphene and nitrogen doped graphene sheets. The method’s crucial advantage relies on harnessing unique plasma mechanisms to control the material and energy fluxes of the main building units at the atomic scale. By tailoring the high energy density plasma environment and complementarily applying in situ IR and soft UV radiation, a controllable selective synthesis of high quality graphene sheets at 2 mg/min yield with prescribed structural qualities was achieved. Raman spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy and Near Edge X-ray-absorption fine-structure spectroscopy were used to probe the morphological, chemical and microstructural features of the produced material. The method described here is scalable and show a potential for controllable, large-scale fabrication of other graphene derivatives and promotes microwave plasmas as a competitive, green, and cost-effective alternative to presently used chemical methods.

show abstract

Section: Resultsmentioning

confidence: 99%

Towards large-scale in free-standing graphene and N-graphene sheets

Tatarova

Dias

Henriques

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…X‐ray Photoelectron Spectroscopy (XPS) characterization was performed with a dual‐anode XSAM800 spectrometer from KRATOS. Operation conditions, spectra acquisition, samples preparation and data treatment are described elsewhere . For quantification purposes, sensitivity factors from software libraries were used.…”

Section: Methodsmentioning

confidence: 99%

“…Operation conditions, spectra acquisition, samples preparation and data treatment are described elsewhere. [14,41] For quantification purposes, sensitivity factors from software libraries were used.…”

Section: Characterizationmentioning

confidence: 99%

One‐Step Cathodic and Anodic Synthesis of Hydrophilic Carbon Nanomaterials

et al. 2017

Self Cite

View full text Add to dashboard Cite

It was demonstrated that the galvanostatic polarization of graphite electrodes in a cell with two separated compartments generates simultaneously and straightforwardly, without further separation and functionalization, two distinct sets of hydrophilic carbon nanomaterials [electrogenerated hydrophilic carbon (EHC)], in the anodic and cathodic compartments, respectively. The synthesized products comprise an amorphous carbonaceous material with aromatic sp2 carbon clusters, differing mainly in their oxidation degree. Surprisingly, it was found that nitrogen is incorporated in the carbon‐based material during the electrolysis, which is provided by the N2 gas present in the air and/or aqueous medium. This phenomenon is explained on the basis that very reactive carbonaceous species are formed during the electrodes polarization, owing to an anomalous high electric field generated along the galvanostatic polarization. In addition, it was also evidenced that ECH materials display a negative charge, counterbalanced by sodium ions and unique optical properties, exhibiting deep ultraviolet emission (ca. 4.1 eV), as well as blue luminescence. It is foreseen that these carbon materials will have important repercussions in optoelectronics devices, energy technology (supercapacitors, batteries, and fuel cells), and biomedicine.

show abstract

“…Recent studies have illustrated that the response of PPy-modified electrodes can be greatly enhanced by coupling PPy with secondary conductive centers (such as metallic or carbonaceous materials) [35,36]. The PPy/CNP coated GCE described in the present work, offers marked acceleration of the m-dopa electrooxidation compared to the individual (PPy and CNP) modified electrodes.…”

Section: Introductionmentioning

confidence: 91%

Sensitive Electrochemical Sensor for Determination of Methyldopa Based on Polypyrrole/Carbon Nanoparticle Composite Thin Film Made by In Situ Electropolymerization

2011

View full text Add to dashboard Cite

A composite surface coating is prepared by electropolymerization of a mixture of pyrrole and carbon nanoparticles onto a glassy carbon electrode (GCE). The microscopic structure and morphology of the composite film is characterized by scanning electron microscopy. The modified electrode offers a considerable improvement in voltammetric sensitivity toward methyldopa (m-dopa), compared to the bare and polypyrrole-coated GCEs. A significantly enhanced anodic peak current together with a remarkable increase in sharpness of the cyclic voltammetric (CV) signals are observed for the detection of m-dopa. The effect of experimental parameters, such as scan rate and pH, are investigated by monitoring CV responses toward m-dopa. It is found that a maximum current response can be obtained at pH 3.0 under a diffusion controlled process. A wide linear dynamic range (0.2-50 mM) with a detection limit of 60 nM is achieved for m-dopa. The excellent response characteristics, e.g., high sensitivity, very good repeatability and reproducibility, and low detection limit, have made the prepared sensor suitable for the analysis of mdopa in pharmaceutical and clinical preparations.

show abstract

Electrocatalytic activity of polypyrrole films incorporating palladium particles

Cited by 14 publications

References 34 publications

Towards large-scale in free-standing graphene and N-graphene sheets

Towards large-scale in free-standing graphene and N-graphene sheets

One‐Step Cathodic and Anodic Synthesis of Hydrophilic Carbon Nanomaterials

Sensitive Electrochemical Sensor for Determination of Methyldopa Based on Polypyrrole/Carbon Nanoparticle Composite Thin Film Made by In Situ Electropolymerization

Contact Info

Product

Resources

About