The role of graphene oxide and its reduced form in the in situ photocatalytic growth of silver nanoparticles on graphene-TiO2 nanocomposites

Kisielewska, Aneta; Spilarewicz-Stanek, Kaja; Cichomski, M.; Kozlowski, W.; Piwoński, Ireneusz

doi:10.1016/j.apsusc.2021.151759

Cited by 14 publications

(6 citation statements)

References 59 publications

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“…This is because the reduction reaction of GO leads to the disappearance of oxygen-containing functional groups on the structure's surface, resulting in the formation of double bonds [64]. These findings are consistent with previous studies [65][66][67], which also demonstrated that the conductivity of reduced graphene oxide (RGO) is higher than that of GO. However, GO possesses several advantages over RGO, including higher solubility [68] and the potential for surface functionalization [69].…”

Section: Introductionsupporting

confidence: 91%

“…However, GO possesses several advantages over RGO, including higher solubility [68] and the potential for surface functionalization [69]. Moreover, the properties and compatibility of RGO with substrates are influenced by its degree of reduction [65,70]. When the reduction degree of GO is low, the electrical conductivity is relatively low, but the compatibility with the matrix is enhanced, resulting in an increase in the latent heat value of the PCM.…”

Section: Introductionmentioning

confidence: 99%

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The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Shih

Liao

Tsai

et al. 2023

J Chinese Chemical Soc

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BackgroundIn this study, a series of phase change composites were developed. Phase change materials (PCMs) are substances with a high heat of fusion, thereby possessing great potential for solar thermal storage. However, their disadvantages, such as low thermal conductivity, phase separation, and supercooling, limit their further applications.ObjectiveIn this study, magnesium nitrate hexahydrate (MNH) was used as the phase change material, and different proportions of photothermal materials were added to improve the thermally conductive property and solar thermal storage efficiency of MNH.MethodsThis study used magnesium nitrate hexahydrate (MNH) as the substrate. In addition, different proportions of photothermal materials (carbon nanotubes, nano‐graphite, graphene, and partially reduced graphene oxide) were added to promote the efficiency of thermal energy storage. Additionally, a fixed ratio of carboxy methyl cellulose (CMC) was added. The phase change temperature and enthalpy change of the phase change material samples were explored and analyzed by differential scanning calorimeter (DSC). In addition, the thermophysical properties, photothermal storage performance, and thermal reliability analysis of the samples were investigated.ResultsThe results showed that the PCM composites prepared with nano‐graphite have higher latent heat and longer time of phase change. However, the composites prepared with carbon nanotubes (CNTs) have lower latent heat and a shorter time of phase change. Therefore, the partially reduced graphite oxide (PRGO)‐containing composites can retain the latent heat storage capacity of nano‐graphite and decrease the time of phase change, thereby improving the photothermal storage efficiency. The results reveal that the solar thermal storage efficiency of the composite with both CNTs and PRGO could reach up to 0.716.ConclusionsMCGOT‐1 and MCGOT‐2 have high latent heat values, and the phase transition time is short. Therefore, the thermal energy storage efficiency can be as high as 0.716. In addition, compared with related literature, the photothermal storage efficiency of MCGOT‐2 increased by about 2 times. Therefore, the environmentally friendly composites developed in this study have a high potential to be used in solar energy storage and energy‐saving systems.

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Section: Introductionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Shih

Liao

Tsai

et al. 2023

J Chinese Chemical Soc

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“…The surveyed spectra of TiO 2 , TiO 2 /rGO and TiO 2 /rGO/Ag indicate the presence of Ti, O, Ag and C elements without any impurities in the prepared hybrid nanostructures (as given in Supporting Information Figure S2 ). The deconvoluted C 1s spectrum of the as-prepared GO sample is shown in Figure 1 c as follows: (i) At 282.55 eV, C bonds with sp 1 carbon atoms [ 37 ], (ii) C=C bonds denote the aromatic sp 2 structure groups present in the GO at 284.66 eV, (iii) the peak at 286.30 eV represents the carboxyl groups (C–O bonds) including epoxy and hydroxyl group [ 38 ]. In the case of the TiO 2 /rGO sample, the deconvoluted XPS peak of the C 1s spectrum shows the four diverse carbon bonds with various binding energies of 283.18 eV, 284.74 eV, 286.07 eV and 288.72 eV.…”

Section: Resultsmentioning

confidence: 99%

Plasmon Effect of Ag Nanoparticles on TiO2/rGO Nanostructures for Enhanced Energy Harvesting and Environmental Remediation

et al. 2022

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We report Ag nanoparticles infused with mesosphere TiO2/reduced graphene oxide (rGO) nanosheet (TiO2/rGO/Ag) hybrid nanostructures have been successfully fabricated using a series of solution process synthesis routes and an in-situ growth method. The prepared hybrid nanostructure is utilized for the fabrication of photovoltaic cells and the photocatalytic degradation of pollutants. The photovoltaic characteristics of a dye-sensitized solar cell (DSSC) device with plasmonic hybrid nanostructure (TiO2/rGO/Ag) photoanode achieved a highest short-circuit current density (JSC) of 16.05 mA/cm2, an open circuit voltage (VOC) of 0.74 V and a fill factor (FF) of 62.5%. The fabricated plasmonic DSSC device exhibited a maximum power conversion efficiency (PCE) of 7.27%, which is almost 1.7 times higher than the TiO2-based DSSC (4.10%). For the photocatalytic degradation of pollutants, the prepared TiO2/rGO/Ag photocatalyst exhibited superior photodegradation of methylene blue (MB) dye molecules at around 93% and the mineralization of total organic compounds (TOC) by 80% in aqueous solution after 160 min under continuous irradiation with natural sunlight. Moreover, the enhanced performance of the DSSC device and the MB dye degradation exhibited by the hybrid nanostructures are more associated with their high surface area. Therefore, the proposed plasmonic hybrid nanostructure system is a further development for photovoltaics and environmental remediation applications.

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“…It is suitable for several applications, electrical and biological, due to its low toxicity, antimicrobial properties, and biocompatible behavior [ 12 ]. Graphene oxide (GO) has common usage in the nanotechnology field and other studies due to its two-dimensional honeycomb structure [ 13 , 14 ]. It exhibits several suitable properties such as high mechanical strength, low preparation cost, and good hydrophilicity [ 13 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…Graphene oxide (GO) has common usage in the nanotechnology field and other studies due to its two-dimensional honeycomb structure [ 13 , 14 ]. It exhibits several suitable properties such as high mechanical strength, low preparation cost, and good hydrophilicity [ 13 , 15 , 16 ]. The aim of this study is to enhance wound dressings with additional properties by using CS with different contributions of Yb 2 O 3 and V 2 O 5 .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Bio-Based Film Comprising Metal Oxide Nanoparticles Loaded Chitosan for Wound Dressing Applications

et al. 2022

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In the current work, chitosan (CS)–metal oxide nanohybrid (MONH) composites are prepared via combining CS with MONH made of vanadium oxide (V2O5), ytterbium trioxide (Yb2O3), and graphene oxide (GO) to generate promising wound dressing materials using the film-casting method. The developed nanohybrid@CS was examined using techniques such as Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX), and thermogravimetric analysis (TGA). For Yb2O3@CS, the surface morphology was shown to be a rough and porous surface with pores that ranged in size from 3.0 to 5.0 µm. For CS with Yb2O3, Yb2O3/V2O5@CS, and Yb2O3/V2O5/GO@CS, the contact angles were 72.5°, 68.2°, and 46.5°, respectively. When the nanohybrid@CS was in its hydrophilic phase, which is good for absorbing moisture and drugs, there was a notable decrease in angles that tended to rise. Additionally, the inclusion of MONH allowed the cell viability to be confirmed with an IC50 of 1997.2 g/mL and the cell growth to reach 111.3% at a concentration of 7.9 g/mL.

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The role of graphene oxide and its reduced form in the in situ photocatalytic growth of silver nanoparticles on graphene-TiO2 nanocomposites

Cited by 14 publications

References 59 publications

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

The application of magnesium nitrate hexahydrate/hybrid carbon material phase change composites in solar thermal storage

Plasmon Effect of Ag Nanoparticles on TiO2/rGO Nanostructures for Enhanced Energy Harvesting and Environmental Remediation

Fabrication of Bio-Based Film Comprising Metal Oxide Nanoparticles Loaded Chitosan for Wound Dressing Applications

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