Fabrication and Electrochemical Behavior Investigation of a Pt-Loaded Reduced Graphene Oxide Composite (Pt@rGO) as a High-Performance Cathode for Dye-Sensitized Solar Cells

Le, Viet Hai; Nguyen, Thai Hoang; Nguyen, Hong Haï; Huynh, Le Thanh Nguyen; Vo, An; Nguyen, Thi Kim Tuyet; Nguyen, Duc Thinh; Lam, Vinh

doi:10.1155/2020/8927124

Cited by 17 publications

(5 citation statements)

References 36 publications

(44 reference statements)

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“…It can conclude that typical D peak in rGO relates to sp 3 defects and dominant G peak associated to sp 2 configuration along with secondary 2D, D?G, and C peaks formed due to combined phonon frequencies and C-H stretch of carbon, found at 1809, 1988, and 2146 cm -1 , respectively [27]. The observed Raman spectrum for rGO is also well matched with the XRD pattern and is distinct than graphite powder [28][29][30]. In curve (iii) of Fig.…”

Section: Thatsupporting

confidence: 61%

Natural fibers and reduced graphene oxide-based flexible paper electrode for energy storage applications

Bibi

Masood

Khan

et al. 2021

J Mater Sci: Mater Electron

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In recent era of modern and bendable technology, energy dearth arises as a paramount subject around the globe with a dire demand of flexible and lightweight energy storage devices. This study targets fabrication of reduced graphene oxide (rGO) and utility of abundantly available, cost effective, and environment friendly lignocelluloses (LC) fibers extracted from Carica papaya source, as a binder to bind active material (rGO) as robust and compact paper sheet. Fabricated samples were analyzed by X-ray diffraction for crystallographic analysis, Scanning electron microscopy, Transmission electron microscope for morphology, Fourier transform infrared spectroscopy for structural bonding, and Raman spectroscopy for vibrational modes. Robust and bendable rGO/LC paper electrode was tested for energy storage application by employing in different characterizations, i.e., cyclic voltammetry for capacitive behavior, galvanostatic charge-discharge for symmetric EDLC, and electrochemical impedance spectroscopy for resistive charge kinetics, respectively. rGO/LC composite sheet employed as working electrode in 3-electrode CV measurements and revealed specific capacitance of 591 F/g at a scan rate of 5 mV/s by keeping the undistorted shape of voltammograms at higher scan rates which present it as a suitable candidate for modern flexible and energy storage devices. rGO/LC-based symmetric cell revealed the highest specific capacitance of 228 F/g at applied current density of 0.1 A/g, the energy density of 6.3 Wh/kg, and power density of 129 W/kg, respectively. rGO/LC-based symmetric cell confirmed the cycling stability by revealing capacitance retention of 82% after 200 cycles. It can conclude that biomass-based rGO paper sheet can be a potential candidate as environmentally safe with remarkable electrochemical activity in energy storage applications.

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Section: Thatsupporting

confidence: 61%

Natural fibers and reduced graphene oxide-based flexible paper electrode for energy storage applications

Bibi

Masood

Khan

et al. 2021

J Mater Sci: Mater Electron

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“…The bands at 3455 cm −1 and 1400 cm −1 are corresponding to O-H stretching vibration and O-H bending vibration respectively, suggest the presence of (BiO) 4 CO 3 (OH) 2 in composition 54,55 .…”

Section: Resultsmentioning

confidence: 98%

Structural, Optical and Photocatalytic Activity of α-Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 Ternary Multi-heterojunction Nanoflakes Synthesized via Submerged DC Electrical Discharge in Urea Solution

Hashemi

Poursalehi

Delavari

2022

Preprint

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In this research, novel α-Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 multi-heterojunction photocatalytic nanoflakes are fabricated via submerged DC electrical arc discharge in urea in water solution. FT-IR, XRD, EDS and PL results conform the formation of α-Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 multi-heterojunction. Formation of nanoflake morphology are revealed by FE-SEM, TEM images. Based on UV-visible results the calculated band gap energies are in the range between 2.7 and 3.0 eV for fresh sample and after one month. The photocatalytic performance of sample is investigated via degradation of methylene orange (MeO) under visible light irradiation. α-Bi2O3/Bi2O2CO3/ (BiO)4CO3(OH)2 exhibited much higher photocatalytic activity than Bi2O2CO3, Bi2O3 and Bi2O3/Bi2O2CO3. Also, stable photodegradation efficiency of sample after four cycles reveal the long term stability and reusability of synthesized photocatalyst. PL intensity show improved separation rate of electrons and holes and so better photocatalytic performance of multi-heterojunction in compared to single phase photocatalyst. The enhanced photocatalytic activity can be ascribed to the formation of multi-heterojunctions, flake morphology and intrinsic internal electric field (IEF). Multi-heterojunction nanoflakes enhance the absorbance of visible light and facilitate the separation and transport of photogenerated electron-holes through large IEF which enhance the photocatalytic activity. Our work offers an effective method for production of innovative bismuth based photocatalyst with excellent prospective for degradation of environmental pollutions and light harvesting for renewable energy generation under visible-light.

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“…I D /I G was calculated to be 0.77, 0.88, and 0.89 for bare, GO, and TrGO electrodes, respectively, but 1.15 for ErGO. The higher number in the intensity ratio of ErGO indicates that the reduction process may change the GO structure, resulting in an increase of defects in the structure and a decrease in the average size of the sp 2 due to the removal of the oxygenated functional groups [ 37 , 38 , 39 ]. A 2D band and a D + G band, which become significant in rGO, were also observed at 2680 cm −1 and 2910 cm −1 , respectively, demonstrating the restoration of the graphite structures [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

Detection of a Double-Stranded MGMT Gene Using Electrochemically Reduced Graphene Oxide (ErGO) Electrodes Decorated with AuNPs and Peptide Nucleic Acids (PNA)

Safarzadeh

Pan

2022

Biosensors

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The ability to detect double-stranded DNA (dsDNA) as a biomarker without denaturing it to single-stranded DNA (ss-DNA) continues to be a major challenge. In this work, we report a sandwich biosensor for the detection of the ds-methylated MGMT gene, a potential biomarker for brain tumors and breast cancer. The purpose of this biosensor is to achieve simultaneous recognition of the gene sequence, as well as the presence of methylation. The biosensor is based on reduced graphene oxide (rGO) electrodes decorated with gold nanoparticles (AuNPs) and uses Peptide Nucleic Acid (PNA) that binds to the ds-MGMT gene. The reduction of GO was performed in two ways: electrochemically (ErGO) and thermally (TrGO). XPS and Raman spectroscopy, as well as voltammetry techniques, showed that the ErGO was more efficiently reduced, had a higher C/O ratio, showed a smaller crystallite size of the sp2 lattice, and was more stable during measurement. It was also revealed that the electro-deposition of the AuNPs was more successful on the ErGO surface due to the higher At% of Au on the ErGO electrode. Therefore, the ErGO/AuNPs electrode was used to develop biosensors to detect the ds-MGMT gene. PNA, which acts as a bio-recognition element, was used to form a self-assembled monolayer (SAM) on the ErGO/AuNPs surface via the amine-AuNPs interaction, recognizing the ds-MGMT gene sequence by its invasion of the double-stranded DNA and the formation of a triple helix. The methylation was then detected using biotinylated-anti-5mC, which was then measured using the amperometric technique. The selectivity study showed that the proposed biosensor was able to distinguish between blank, non-methylated, non-complementary, and target dsDNA spiked in mouse plasma. The LOD was calculated to be 0.86 pM with a wide linear range of 1 pM to 50 µM. To the best of our knowledge, this is the first report on using PNA to detect ds-methylated DNA. This sandwich design can be modified to detect other methylated genes, making it a promising platform to detect ds-methylated biomarkers.

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Fabrication and Electrochemical Behavior Investigation of a Pt-Loaded Reduced Graphene Oxide Composite (Pt@rGO) as a High-Performance Cathode for Dye-Sensitized Solar Cells

Abstract: A platinum-reduced graphene oxide thin film composite (Pt@rGO, 100 nm) was prepared on a fluorine-doped tin oxide- (FTO-) coated glass substrate by a screen printing method using a Pt@rGO screen printing paste (0.12% Pt; Pt/rGO=1.5 w/w). The as-prepared electr… Show more

Cited by 17 publications

References 36 publications

Natural fibers and reduced graphene oxide-based flexible paper electrode for energy storage applications

Natural fibers and reduced graphene oxide-based flexible paper electrode for energy storage applications

Structural, Optical and Photocatalytic Activity of α-Bi2O3/Bi2O2CO3/(BiO)4CO3(OH)2 Ternary Multi-heterojunction Nanoflakes Synthesized via Submerged DC Electrical Discharge in Urea Solution

Detection of a Double-Stranded MGMT Gene Using Electrochemically Reduced Graphene Oxide (ErGO) Electrodes Decorated with AuNPs and Peptide Nucleic Acids (PNA)

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