A new class of electroactive Fe- and P-functionalized graphene for oxygen reduction

2015 ◽  
Vol 3 (20) ◽  
pp. 11031-11039 ◽  
Author(s):  
Fatemeh Razmjooei ◽  
Kiran Pal Singh ◽  
Eun Jin Bae ◽  
Jong-Sung Yu
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Functionalized Graphene ◽  
New Class ◽  
Reduced Graphene ◽  
Acidic Conditions ◽  
Orr Activity

A new class of electroactive Fe- and P-functionalized reduced graphene oxide is prepared, which illustrates high ORR activity both in alkaline and acidic conditions due to its high surface area and formation of active Fe–P complex.

scholarly journals High-Surface-Area Nitrogen-Doped Reduced Graphene Oxide for Electric Double-Layer Capacitors

ChemSusChem ◽  
2015 ◽  
Vol 8 (11) ◽  
pp. 1875-1884 ◽  
Author(s):  
Hee-Chang Youn ◽  
Seong-Min Bak ◽  
Myeong-Seong Kim ◽  
Cherno Jaye ◽  
Daniel A. Fischer ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
Double Layer ◽  
Electric Double Layer ◽  
High Surface ◽  
High Surface Area ◽  
Nitrogen Doped ◽  
Reduced Graphene ◽  
Double Layer Capacitors

Inside Cover: High-Surface-Area Nitrogen-Doped Reduced Graphene Oxide for Electric Double-Layer Capacitors (ChemSusChem 11/2015)

ChemSusChem ◽  
2015 ◽  
Vol 8 (11) ◽  
pp. 1822-1822
Author(s):  
Hee-Chang Youn ◽  
Seong-Min Bak ◽  
Myeong-Seong Kim ◽  
Cherno Jaye ◽  
Daniel A. Fischer ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
Double Layer ◽  
Electric Double Layer ◽  
High Surface ◽  
High Surface Area ◽  
Nitrogen Doped ◽  
Reduced Graphene ◽  
Double Layer Capacitors

A one-step electrochemically reduced graphene oxide based sensor for sensitive voltammetric determination of furfural in milk products

2021 ◽  
Vol 13 (1) ◽  
pp. 56-63
Author(s):  
Qiuqiu Wang ◽  
Juanhua Zhang ◽  
Yanbo Xu ◽  
Yingyi Wang ◽  
Liang Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Milk Products ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide ◽  
One Step ◽  
Dairy Milk

One-step electrochemically reduced graphene oxide with high surface area and improved electron transfer kinetics shows great performances in the determination of furfural in dairy milk.

scholarly journals Synthesis and modification of reduced graphene oxide aerogels for biofuel cell applications

2015 ◽  
Vol 33 (2) ◽  
pp. 292-300 ◽  
Author(s):  
Izabela Kondratowicz ◽  
Kamila Żelechowska ◽  
Dominika Majdecka ◽  
Renata Bilewicz
Keyword(s):  
Graphene Oxide ◽  
Porous Structure ◽  
Reduced Graphene Oxide ◽  
High Surface ◽  
3D Structure ◽  
High Surface Area ◽  
Biofuel Cell ◽  
Cyclic Voltammograms ◽  
Multiwalled Carbon ◽  
Reduced Graphene

AbstractWe have carried out the preparation of reduced graphene oxide aerogels using eco-friendly method that is based on the Hummers method of graphite oxidation without the use of NaNO3 that produces toxic gases. To obtain a porous 3D structure of reduced graphene oxide, we performed the hydrothermal reduction at elevated temperature. We also prepared the rGO aerogel/CNT composite using multiwalled carbon nanotubes as linkers. The rGO aerogels are promising materials as they possess good electrical conductivity (up to 100 S/m) and high surface area and porous structure (~500 m2/g). The main goal was to obtain the material for electrodes in enzymatic biofuel cells. Thus, the proper modification was performed using free radical functionalization. It was shown that in order to synthesize rGO aerogels modified with anthracene, the proper order of reactions needs to be provided. The morphology of anthracene modified electrodes was analyzed using scanning electron microscopy, which confirmed their porous structure with non-uniform pore size distribution that ranged between few nanometers to microns. Data obtained by Raman spectroscopy confirmed the successful oxidation and reduction of analyzed materials. UV-Vis spectra revealed the presence of anthracene moieties in examined materials. We also recorded preliminary cyclic voltammograms that confirm an electric conductivity of the obtained structures.

The Effect of Graphene Oxide/Reduced Graphene Oxide Functionalized with Metal Nanoparticles on Dermal, Bacterial, and Cancerous/Non-Cancerous Epidermal Cells

MRS Advances ◽  
2016 ◽  
Vol 1 (22) ◽  
pp. 1583-1590 ◽  
Author(s):  
Rebecca Isseroff ◽  
Arthur Chen ◽  
Jae Cho ◽  
Marcia Simon ◽  
Luckner J. Jerome ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Platinum Nanoparticles ◽  
High Surface ◽  
High Surface Area ◽  
Dermal Fibroblasts ◽  
Epidermal Cells ◽  
Wound Dressings ◽  
Reduced Graphene ◽  
Reduced Toxicity

ABSTRACTThe unique planar structures and high surface area of graphene oxide (GO) and reduced graphene oxide (rGO) has induced great interest as drug delivery platforms. Silver and platinum nanoparticles are used in medicine, biotechnology and cosmetics and have electrocatalytic properties. However, GO has been found to be toxic to a variety of cells; pure graphene is insoluble; and nanoparticles aggregate, diminishing their activity. This research functionalized GO and rGO with silver or platinum nanoparticles (Ag/PtNPs) and experimental solutions were then tested on bacteria, dermal fibroblasts (DFBC’s), and cancerous (SCC13’s) and non-cancerous (DO33’s) epidermal cells to determine toxicity and/or cell viability.GO was functionalized with Ag or Pt salts, forming metalized-GO; then reduced with NaBH4. Ag-rGO, depending on nanoparticle size, killed eitherS. AureusorK. Pneumoniae,while Pt-rGO and rGO had no effect.1mM Ag-prGO concentrations diluted 1:100 with DMEM was toxic to SCC13 cancerous keratinocytes but showed reduced toxicity to DO33 non-cancerous keratinocytes; whereas Pt-rGO and rGO exerted little effect on SCC13’s and DO33’s at all concentrations. All test solutions adhered to DFBC’s and influenced the orientation of their growth, suggesting potential use in wound dressings to aid healing.

scholarly journals Fabrication of reduced graphene oxide decorated with CuS nanoparticles and its activity toward the adsorption of Methylene Blue

2018 ◽  
Vol 83 (4) ◽  
pp. 503-513 ◽  
Author(s):  
Johra Tuz ◽  
Woo-Gwang Jung
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Kinetics Of Adsorption ◽  
Reduced Graphene ◽  
High And Low Temperatures ◽  
Cus System ◽  
Kinetics Of

Reduced graphene oxide (RGO) can act as an adsorbent because of its high surface area. The adsorptive characteristics of a RGO composite combined with CuS were studied quantitatively. The removal efficiency of Methylene Blue was found to be about 85%, which is higher than that of bare CuS (?73%). Furthermore, the kinetics of adsorption of Methylene Blue was inspected to determine the rate of the process. The removal process was faster with the RGO?CuS system than with bare CuS. Both high and low temperatures were not favorable for this adsorption process. In highly ionic media of high or low pH, the adsorption was greater than in media of neutral pH. Thermodynamic parameters were calculated in this study and they suggest that this is physisorption and exothermic in nature.

scholarly journals Reduced Graphene Oxide-Supported Pt-Based Catalysts for PEM Fuel Cells with Enhanced Activity and Stability

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 256
Author(s):  
Irina V. Pushkareva ◽  
Artem S. Pushkarev ◽  
Valery N. Kalinichenko ◽  
Ratibor G. Chumakov ◽  
Maksim A. Soloviev ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Surface Area ◽  
Pem Fuel Cells ◽  
Polyol Process ◽  
Proton Exchange ◽  
Active Surface Area ◽  
Electrochemical Performances ◽  
Simultaneous Reduction ◽  
Reduced Graphene

Platinum (Pt)-based electrocatalysts supported by reduced graphene oxide (RGO) were synthesized using two different methods, namely: (i) a conventional two-step polyol process using RGO as the substrate, and (ii) a modified polyol process implicating the simultaneous reduction of a Pt nanoparticle precursor and graphene oxide (GO). The structure, morphology, and electrochemical performances of the obtained Pt/RGO catalysts were studied and compared with a reference Pt/carbon black Vulcan XC-72 (C) sample. It was shown that the Pt/RGO obtained by the optimized simultaneous reduction process had higher Pt utilization and electrochemically active surface area (EASA) values, and a better performance stability. The use of this catalyst at the cathode of a proton exchange membrane fuel cell (PEMFC) led to an increase in its maximum power density of up to 17%, and significantly enhanced its performance especially at high current densities. It is possible to conclude that the optimized synthesis procedure allows for a more uniform distribution of the Pt nanoparticles and ensures better binding of the particles to the surface of the support. The advantages of Pt/RGO synthesized in this way over conventional Pt/C are the high electrical conductivity and specific surface area provided by RGO, as well as a reduction in the percolation limit of the components of the electrocatalytic layer due to the high aspect ratio of RGO.

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