Understanding plasma–ethanol non-equilibrium electrochemistry during the synthesis of metal oxide quantum dots

Padmanaban, Dilli Babu; McGlynn, Ruairi; Byrne, Emily L.; Velusamy, Tamilselvan; Swadźba‐Kwaśny, Małgorzata; Maguire, Paul; Mariotti, Davide

doi:10.1039/d0gc03291c

Cited by 9 publications

(5 citation statements)

References 76 publications

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Section: Resultsmentioning

confidence: 99%

“…This is due to anodic dissolution from the reactions of the exposed Cu surface wherein Cu ions are released in the liquid and could form Cu complexes with the species formed from dissociated ethanol. [36] For step (2), the formation of carbon nanomaterials on the substrate, carbon is simultaneously being formed on the surface and its formation is superior to the etching of the substrate surface. It is believed that the nucleation preferentially in the pits created from the etched surface succeeded by more nucleation on the roughened surface.…”

Section: Proposed Mechanism For the Formation Of Carbon On The Metal ...mentioning

confidence: 99%

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Deposition of carbon‐based materials directly on copper foil and nickel foam as 2D‐ and 3D‐networked metal substrates by in‐liquid plasma

Vega

Nguyen

Kondo

et al. 2023

Plasma Processes & Polymers

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In‐liquid plasma (ILP) process has been an attractive route for nanomaterial synthesis due to its high‐yield production in low‐temperature atmospheric pressure conditions. In comparison with conventional ILP synthesis that produces free‐standing nanomaterials, this work brings a new perspective on the application of the ILP process through carbon formation directly on ethanol‐immersed two‐dimensional (foil) and three‐dimensional (3D) (foam) metal substrates. Three types of carbon, including graphene, graphitic carbon, and amorphous carbon, were simultaneously produced during plasma discharge. Graphitic and amorphous carbon formed radially and coexisted on the metal substrate surface, while free‐standing graphene was produced in ethanol. A conformal coating was achieved on the exterior surface of the 3D‐networked substrate. The proposed mechanism for carbon formation on metal substrates is presented here.

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Section: Resultsmentioning

confidence: 99%

Section: Proposed Mechanism For the Formation Of Carbon On The Metal ...mentioning

confidence: 99%

Deposition of carbon‐based materials directly on copper foil and nickel foam as 2D‐ and 3D‐networked metal substrates by in‐liquid plasma

Vega

Nguyen

Kondo

et al. 2023

Plasma Processes & Polymers

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“…In order to assess the long-term static stability of NFs, we have monitored the transmittance over days ( Figure 10 a–c), with the NF stored in a dark space at room temperature without any form of mixing or shaking (‘static stability’). The results show that while QDs ( Figure 10 c) exhibit superior stability compared to MPs ( Figure 10 a) or NPs ( Figure 10 b), their transmittance is relatively high, a consequence of quantum confinement and widening of the bandgap (to 2.2 eV [ 116 , 117 ]). As the cumulative transmittance increases with the size of the CuO particles, the static stability worsens and the best compromise between optical performance and stability should be found.…”

Section: Characterization Of the Stability Of Nanofluids For Dasc App...mentioning

confidence: 99%

Nanofluids for Direct-Absorption Solar Collectors—DASCs: A Review on Recent Progress and Future Perspectives

et al. 2023

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Owing to their superior optical and thermal properties over conventional fluids, nanofluids represent an innovative approach for use as working fluids in direct-absorption solar collectors for efficient solar-to-thermal energy conversion. The application of nanofluids in direct-absorption solar collectors demands high-performance solar thermal nanofluids that exhibit exceptional physical and chemical stability over long periods and under a variety of operating, fluid dynamics, and temperature conditions. In this review, we discuss recent developments in the field of nanofluids utilized in direct-absorption solar collectors in terms of their preparation techniques, optical behaviours, solar thermal energy conversion performance, as well as their physical and thermal stability, along with the experimental setups and calculation approaches used. We also highlight the challenges associated with the practical implementation of nanofluid-based direct-absorption solar collectors and offer suggestions and an outlook for the future.

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“…over a range of reduced electric field values, and the resulting lookup tables were linearly interpolated with simulation outputs [31]. The specific experimental configuration modeled in this work, shown in figure 1a, was a DC atmospheric-pressure plasma formed between a metal tip and the surface of an ionically-conductive aqueous solution which has been the focus of many previous studies of plasma-liquid interactions [23,24,32,33]. As in previous experiments and those conducted as part of this study, the gas discharge region was specified to be 1 mm long (i.e.…”

Section: Plasma Phasementioning

confidence: 99%

Multiphase modeling of the DC plasma–water interface: application to hydrogen peroxide generation with experimental validation

Keniley

Üner

Perez

et al. 2022

Plasma Sources Sci. Technol.

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Here, we present a one-dimensional, time-dependent multi-physics model of the plasma-liquid interface that encompasses both the plasma and liquid phases using the MOOSE-based drift-diffusion-reaction software, Zapdos-Crane. The model was applied to an experimental configuration comprised of a direct-current powered argon plasma formed at the surface of an aqueous, ionically conductive solution. In this system, one of the reactions that occurs is the formation of hydroxide radicals, which subsequently produce hydrogen peroxide. We studied potential mechanisms for hydrogen peroxide production with the plasma operated as either the cathode or anode. Experiments were performed in support of modeling to characterize the plasma and measure the aqueous hydrogen peroxide, and both modeling and experimental results show that its production is substantially higher during anodic operation. In the case of the cathodic plasma, the simulations predict that solvated electrons degrade aqueous hydrogen peroxide, and in support, adding nitrate, a known electron scavenger, to the electrolyte during cathodic operation is shown to increase the production of aqueous hydrogen peroxide by an order of magnitude in experiments.

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Understanding plasma–ethanol non-equilibrium electrochemistry during the synthesis of metal oxide quantum dots

Abstract: Plasma-liquid interactions are becoming increasingly interesting due to their key features such as non-faradaic, non-equilibrium behaviour as well electron-driven reactions, therefore with potential strong impact for several promising applications. However,...

Cited by 9 publications

References 76 publications

Deposition of carbon‐based materials directly on copper foil and nickel foam as 2D‐ and 3D‐networked metal substrates by in‐liquid plasma

Deposition of carbon‐based materials directly on copper foil and nickel foam as 2D‐ and 3D‐networked metal substrates by in‐liquid plasma

Nanofluids for Direct-Absorption Solar Collectors—DASCs: A Review on Recent Progress and Future Perspectives

Multiphase modeling of the DC plasma–water interface: application to hydrogen peroxide generation with experimental validation

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