Activated graphene nanoplatelets as a counter electrode for dye-sensitized solar cells

Gong, Jiawei; Zhou, Zhengping; Sumathy, K.; Yang, Huojun; Qiao, Qiquan

doi:10.1063/1.4945375

Cited by 38 publications

(10 citation statements)

References 31 publications

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“…All SCs and GNPs are platelet-shaped and are identical as those found in the walls of the carbon nanotubes, but in a planar form. A similar shape of the 25GNPs was found in [30]. Almost identical SEM images for the CS were presented in the [31].…”

Section: The Sem Measurementsupporting

confidence: 72%

Application of Carbonized Starches as Carbon Electrode Active Material Compared to Graphene Nanoplatelets-Based Anode in a Lithium-Ion Cell

Pigłowska

Kurc

Rymaniak

2021

Waste Biomass Valor

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The main aim of this research is the examination of the physicochemical properties and their impact on the electrochemical activity of carbon materials obtained from the starch of different botanical origin (SCs). The obtained materials are compared to graphene nanoplatelets (GNPs) of different particle sizes (5 and 25 µm) applied as an anode active material for high-performance lithium-ion cells. SCs were obtained via thermal carbonization and this process enables an obtainment of better sorption properties compared to GNPs. The excellent electrochemical properties are mainly attributed to the good DLi+ (3.03 × 10−13–7.64 × 10−11 cm2 s−1 for SCs and 7.60 × 10−13–5.42 × 10−12 cm2 s−1 for GNPs) and relatively small resistances (EIS). However, the primary focus is on the specific capacity and cyclability. The capacity retentions of CSC cycled at 1 mA g−1, 10 mA g−1, 50 mA g−1, 1 mA g−1 for 50 cycles are 98%, 99%, 96%, 94% with specific capacities equal to 820, 800, 790, 1000 mAh g−1, respectively. The 5GNPs and 25GNPs may present a much smaller reversible capacity of 650, 600 mAh g−1 at 10 mA g−1. The thermal modification process of starches is simple, safe and widely applied, providing new paths for rational engineering of anode materials for LIBs. Moreover, the applied materials are easily available worldwide and are promising in the well-known Green Chemistry aspect making the cells more biodegradable. Graphic Abstract

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Section: The Sem Measurementsupporting

confidence: 72%

Application of Carbonized Starches as Carbon Electrode Active Material Compared to Graphene Nanoplatelets-Based Anode in a Lithium-Ion Cell

Pigłowska

Kurc

Rymaniak

2021

Waste Biomass Valor

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“…From the SEM images, it was possible to draw some conclusions regarding the overall incorporation and distribution of GNPs into the PDMS matrix. Although some bigger conglomerates still exist, reflecting the layer-stacked compact structure of GNPs (which results from the strong π-π interactions between graphene nanoplatelets) [ 72 ], in general, GNPs were uniformly dispersed into the PDMS network ( Figure 2 b,c). This dispersion uniformity guarantees a larger exposure of the surface of GNPs to bacterial cells and, potentially, higher antimicrobial activity [ 28 , 73 ].…”

Section: Resultsmentioning

confidence: 99%

Performance of Graphene/Polydimethylsiloxane Surfaces against S. aureus and P. aeruginosa Single- and Dual-Species Biofilms

Oliveira

Gomes

et al. 2022

Nanomaterials

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The increasing incidence of implant-associated infections has prompted the development of effective strategies to prevent biofilm formation on these devices. In this work, pristine graphene nanoplatelet/polydimethylsiloxane (GNP/PDMS) surfaces containing different GNP loadings (1, 2, 3, 4, and 5 wt%) were produced and evaluated on their ability to mitigate biofilm development. After GNP loading optimization, the most promising surface was tested against single- and dual-species biofilms of Staphylococcus aureus and Pseudomonas aeruginosa. The antibiofilm activity of GNP/PDMS surfaces was determined by the quantification of total, viable, culturable, and viable but nonculturable (VBNC) cells, as well as by confocal laser scanning microscopy (CLSM). Results showed that 5 wt% GNP loading reduced the number of total (57%), viable (69%), culturable (55%), and VBNC cells (85%) of S. aureus biofilms compared to PDMS. A decrease of 25% in total cells and about 52% in viable, culturable, and VBNC cells was observed for P. aeruginosa biofilms. Dual-species biofilms demonstrated higher resistance to the antimicrobial activity of GNP surfaces, with lower biofilm cell reductions (of up to 29% when compared to single-species biofilms). Still, the effectiveness of these surfaces in suppressing single- and dual-species biofilm formation was confirmed by CLSM analysis, where a decrease in biofilm biovolume (83% for S. aureus biofilms and 42% for P. aeruginosa and dual-species biofilms) and thickness (on average 72%) was obtained. Overall, these results showed that pristine GNPs dispersed into the PDMS matrix were able to inhibit biofilm growth, being a starting point for the fabrication of novel surface coatings based on functionalized GNP/PDMS composites.

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“…The platinum (Pt) CE shows high electro catalytic activity toward oxidation and reduction process and exhibits good electrical conductivity. However, Pt is a very expensive noble metal and it undergoes slow dissolution due to its corrosive nature toward I 3 − /I − redox couple electrolyte, which deteriorates its long term stability . These drawbacks are the major reasons to investigate on alternative counter electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Performance of Reduced Graphene Oxide as Counter Electrode in Dye Sensitized Solar Cell Applications

Palled¹,

Sundaramoorthy²,

Chandra³

et al. 2018

Phys. Status Solidi A

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In dye sensitized solar cells (DSSC), the counter electrode (CE) plays a significant role in electro catalytic reaction in redox region to achieve maximum power conversion efficiency (PCE) of the DSSC. The graphene oxide (GO) is synthesized by Hummer's method and converted to reduced graphene oxide (RGO) by thermal method. The effect of binders such as NMP, PVP, and nafion for RGO are investigated. The field emission scanning electron microscope (FESEM) of RGO shows the fine layers like structure. The surface area of the RGO is found to be 110.16 m2 g−1 by Brunauer–Emmett–Teller (BET) method and pore volume 0.5182 cm3 g−1 of RGO by Barrett–Joyner–Halenda (BJH) method. The Raman spectra is used to analyze the structural defects and changes of GO and RGO. The crystallite size of GO is 18.6 nm, and RGO is 20.9 nm calculated from the Raman spectrum. For analyzing the electro catalytic properties of the RGO/NMP/PVP, RGO/NMP, and RGO/nafion based CE materials cyclic voltammetry is performed and its maximum current density was measured. The composition of RGO/NMP/PVP based CE exhibits better electro‐catalytic properties when compared to other RGO/NMP and RGO/nafion based counter electrodes. Maximum PCE exhibited by RGO/NMP/PVP CE based DSSC is 5.8%.

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Activated graphene nanoplatelets as a counter electrode for dye-sensitized solar cells

Cited by 38 publications

References 31 publications

Application of Carbonized Starches as Carbon Electrode Active Material Compared to Graphene Nanoplatelets-Based Anode in a Lithium-Ion Cell

Application of Carbonized Starches as Carbon Electrode Active Material Compared to Graphene Nanoplatelets-Based Anode in a Lithium-Ion Cell

Performance of Graphene/Polydimethylsiloxane Surfaces against S. aureus and P. aeruginosa Single- and Dual-Species Biofilms

Investigation on the Performance of Reduced Graphene Oxide as Counter Electrode in Dye Sensitized Solar Cell Applications

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