scholarly journals Reduced Graphene Oxide Supported Cobalt-Calcium Phosphate Composite for Electrochemical Water Oxidation

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 960
Author(s):  
Keunyoung Lee ◽  
Wonseok Yang ◽  
Eunji Pyo ◽  
Hyebin Choi ◽  
Yeona Cha ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Calcium Phosphate ◽  
Reduced Graphene Oxide ◽  
Amorphous Phase ◽  
Indium Tin Oxide ◽  
Water Oxidation ◽  
Current Voltage ◽  
Reduced Graphene ◽  
Shoulder Peak ◽  
Current Voltage Characteristics

We report the oxygen evolution reaction (OER) catalyst composed of cobalt–calcium phosphate on reduced graphene oxide (CoCaP/rGO). Our catalyst is prepared by the anodic electrolysis of calcium phosphate/rGO mixture loaded on indium-tin-oxide (ITO) in Co2+ aqueous solution. TEM, XPS and XRD experiments confirm that the crystal phase of calcium phosphate (CaP) is transferred into an amorphous phase of calcium oxide with phosphate (5.06 at%) after anodic electrolysis. Additionally, the main cation component of calcium is replaced by cobalt ion. The current–voltage characteristics of CoCaP/rGO showed a shoulder peak at 1.10 V vs. NHE, which originated from Co2+ to higher oxidation states (Co3+ or Co4+) and a strong wave from water oxidation higher +1.16 V vs. NHE at neutral condition (pH 7). CoCaP and CoCaP/rGO showed 4.8 and 10 mA/cm2 at 0.47 V of overpotential, respectively. The enhanced OER catalytic activity of CoCaP/rGO arises from the synergetic interaction between the amorphous phase of CoCaP and electric conducting graphene sheets.

New Water Oxidation Electrocatalyst Based on the Cobalt-Containing Polyoxometalate-Reduced Graphene Oxide Hybrid Nanomaterial

Langmuir ◽  
2021 ◽  
Vol 37 (5) ◽  
pp. 1925-1931
Author(s):  
Samaneh Shahsavarifar ◽  
Majid Masteri-Farahani ◽  
Mohammad Reza Ganjali
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Water Oxidation ◽  
Hybrid Nanomaterial ◽  
Reduced Graphene

scholarly journals Incorporation of functionalized reduced graphene oxide/magnesium nanohybrid to enhance the osteoinductivity capability of 3D printed calcium phosphate-based scaffolds

2020 ◽  
Vol 185 ◽  
pp. 107749 ◽  
Author(s):  
Hossein Golzar ◽  
Dorsa Mohammadrezaei ◽  
Amir Yadegari ◽  
Morteza Rasoulianboroujeni ◽  
Mohadeseh Hashemi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Calcium Phosphate ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene ◽  
3D Printed

scholarly journals Electrochemical Impedance Characterization of Cell Growth on Reduced Graphene Oxide–Gold Nanoparticles Electrodeposited on Indium Tin Oxide Electrodes

2019 ◽  
Vol 9 (2) ◽  
pp. 326 ◽  
Author(s):  
Somasekhar Chinnadayyala ◽  
Jinsoo Park ◽  
Yonghyun Choi ◽  
Jae-Hee Han ◽  
Ajay Yagati ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Cell Growth ◽  
Reduced Graphene Oxide ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electrochemical Impedance ◽  
Hek293 Cells ◽  
Ito Electrode ◽  
Reduced Graphene

The improved binding ability of graphene–nanoparticle composites to proteins or molecules can be utilized to develop new cell-based assays. In this study, we fabricated reduced graphene oxide–gold nanoparticles (rGO-AuNP) electrodeposited onto a transparent indium tin oxide (ITO) electrode and investigated the feasibility of the electrochemical impedance monitoring of cell growth. The electrodeposition of rGO–AuNP on the ITO was optically and electrochemically characterized in comparison to bare, rGO-, and AuNP-deposited electrodes. The cell growth on the rGO–AuNP/ITO electrode was analyzed via electrochemical impedance measurement together with the microscopic observation of HEK293 cells transfected with a green fluorescent protein expression vector. The results showed that rGO–AuNP was biocompatible and induced an increase in cell adherence to the electrode when compared to the bare, AuNP-, or rGO-deposited ITO electrode. At 54 h cultivation, the average and standard deviation of the saturated normalized impedance magnitude of the rGO–AuNP/ITO electrode was 3.44 ± 0.16, while the value of the bare, AuNP-, and rGO-deposited ITO electrode was 2.48 ± 0.15, 2.61 ± 0.18, and 3.01 ± 0.25, respectively. The higher saturated value of the cell impedance indicates that the impedimetric cell-based assay has a broader measurement range. Thus, the rGO–AuNP/ITO electrode can be utilized for label-free and real-time impedimetric cell-based assays with wider dynamic range.

A high-performance three-dimensional Ni–Fe layered double hydroxide/graphene electrode for water oxidation

2015 ◽  
Vol 3 (13) ◽  
pp. 6921-6928 ◽  
Author(s):  
Xiaowen Yu ◽  
Miao Zhang ◽  
Wenjing Yuan ◽  
Gaoquan Shi
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Layered Double Hydroxide ◽  
Water Oxidation ◽  
High Performance ◽  
Three Dimensional ◽  
Oxide Electrode ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide ◽  
Double Hydroxide

Ni–Fe layered double hydroxide nanoplates loaded on a three-dimensional electrochemically reduced graphene oxide electrode for efficient water oxidation, exhibiting higher activity, kinetics, and stability than those of the IrO2catalyst.

scholarly journals Formation and Characterization of Copper Nanocube-Decorated Reduced Graphene Oxide Film

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
M. Z. H. Khan ◽  
M. A. Rahman ◽  
P. Yasmin ◽  
F. K. Tareq ◽  
N. Yuta ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Indium Tin Oxide ◽  
Chemical Reduction ◽  
Device Fabrication ◽  
Simple Method ◽  
Force Microscopy ◽  
Reduced Graphene ◽  
Vis Spectroscopy ◽  
The Individual

In this study, we present a new approach for the formation and deposition of Cu nanocube-decorated reduced graphene oxide (rGO-CuNCs) nanosheet on indium tin oxide (ITO) electrode using very simple method. Cubic Cu nanocrystals have been successfully fabricated on rGO by a chemical reduction method at low temperature. The morphologies of the synthesized materials were characterized by ultraviolet-visible (UV-vis) spectroscopy, scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and atomic force microscopy (AFM). The as-formed CuNCs were found to be homogeneously and uniformly decorated on rGO nanosheets. We demonstrated that the individual rGO sheets can be readily reduced and decorated with CuNCs under a mild condition using L-ascorbic acid (L-AA). Such novel ITO/rGO-CuNCs represent promising platform for future device fabrication and electrocatalytic applications.

scholarly journals Chemiresistive sensors based on Dodecyl benzene Sulfonic acid doped Polypyrrole and Reduced Graphene Oxide for nitrogen oxides

2021 ◽  
Vol 1204 (1) ◽  
pp. 012004
Author(s):  
Djamil Guettiche ◽  
Ahmed Mekki ◽  
Tighilt Fatma Zohra ◽  
Noureddine Ramdani ◽  
Rachid Mahmoud
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Indium Tin Oxide ◽  
Sulfonic Acid ◽  
Flexible Substrate ◽  
Structural Data ◽  
Strong Interactions ◽  
Benzene Sulfonic Acid ◽  
Reduced Graphene ◽  
Dodecyl Benzene Sulfonic Acid

Abstract A new series of polypyrrole doped with n-dodecylbenzene sulphonic acid/reduced graphene oxide (PPy-DBSA/rGO) nanocomposite was electrodeposited on Indium tin oxide coated Polyethylene terephthalate (ITO/PET) flexible substrate by electrochemical route using the chronoamperometric technique. As-prepared for testing of chemiresistive properties against the detection of nitrogen dioxide (NO2) vapors at room temperature. The sensitivity and reactivity of the composite toward NO2 was evaluated. The recorded morphological and structural data confirmed that the PPy-DBSA/rGO forms a homogeneous nanocomposite. The optimal NO2 sensing properties have been revealed by the PPy-DBSA/rGO in terms of response (43%), response time (30.25 s), the detection limit (1ppm), and reproducibility. Furthermore, Results showed that the doped by sulfonic acid improved both the sensitivity and the reactivity of our produced nanocomposite toward NO2. Due to the strong interactions between the NO2 gas molecules and the rGO was dramatically enhanced the electronic properties of these nanocomposites. These striking characteristics of the newly developed nanocomposites make them very suitable to be used as NO2 gas sensor.

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