Laser induced hydrogen emission from ethanol with dispersed graphene particles

Stręk, W.; Miśta, W.; Wiewiórski, P.; Tomala, Robert

doi:10.1016/j.cplett.2021.138649

Cited by 7 publications

(7 citation statements)

References 22 publications

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“…Additionally, thermionic emission was also proposed as the origin for LIWE 13 which also predicts electron ejection. This hot electron emission was observed in graphene foam 10 and proposed to be responsible for the dehydrogenation of ethanol producing H 2 , CH 4 , and CO in graphene, 20 and photocatalytic activity was also observed in methanol, both liquid and vapor, 18,19 as well as in water. 21 The bubbles observed in this article may also be associated with the production of gases, specially H 2 .…”

Section: ■ Results and Discussionmentioning

confidence: 81%

“…Additionally, ejection of hot electrons has been observed in LIWE, 10 which has the potential to be used in photocatalytic applications. 15−17 In fact, LIWE has been used previously to produce hydrogen from methanol, 18,19 ethanol, 20 and water. 21 Although LIWE has been observed in such a wide variety of materials, usually the experimental data is obtained either in vacuum or air.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Several mechanisms have been proposed for this phenomenon, such as blackbody radiation, , oxygen vacancy, multiphoton ionization, and intervalence charge transfer. ,,,, Concerning multiphoton ionization and intervalence charge transfer (IVCT) both can act synergistically, in which a multiphoton absorption is responsible for the ionization of the material, creating an intervalence pair, such as Ce 3+ -Ce 4+ , Eu 2+ -Eu 3+ , Yb 2+ -Yb 3+ , , and Cr 3+ -Cr 4+ , that can undergo an IVCT generating this broadband emission in the whole visible range. Additionally, ejection of hot electrons has been observed in LIWE, which has the potential to be used in photocatalytic applications. − In fact, LIWE has been used previously to produce hydrogen from methanol, , ethanol, and water …”

Section: Introductionmentioning

confidence: 99%

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Laser-Induced Broadband White Emission of NdAlO₃ Nanocrystals in Alcohols

et al. 2023

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Laser-induced white emission (LIWE) is a phenomenon in which a broadband emission is generated through focused laser excitation and described in several different materials; however, the vast majority was explored only in vacuum or air. Herein, LIWE for NdAlO3 nanocrystals immersed in different alcohols is described. It was observed as an evolution of bubbles in the focused point of excitation, which was responsible for the intermittence of the white emission due to changes in the excitation beam going through the bubbles. LIWE, although intermittent, presents a similar behavior regarding the nonlinear dependence of the excitation power in every alcohol used; however, a clear increase in the threshold of the LIWE phenomenon was observed, which was closely related to the relative permittivity of the alcohol in which the sample was immersed. This may open up the possibility to explore LIWE in solvents by properly choosing the material, relative permittivity of the solvent, and appropriate excitation power.

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Section: ■ Results and Discussionmentioning

confidence: 81%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser-Induced Broadband White Emission of NdAlO₃ Nanocrystals in Alcohols

et al. 2023

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“…Interestingly, several studies have also reported an increase in LIWE intensity with increasing pressure [5,12,13]; thus, the vacuum necessity for the emission must be a case-specific situation. Moreover, recent experiments performed on LIWE generation on graphene foam immersed in alcohol revealed very efficient hydrogen generation [14,15]. This indicates that chemical reactions may occur at the interface sample/medium during LIWE generation catalyzed by a high photoionized electron cloud density.…”

Section: Introductionmentioning

confidence: 93%

Understanding continuous wave laser-induced chemical reactions at micro- and nano-diamond-glass interface under infrared excitation

Żemojtel,

Olejniczak,

Tomala

et al. 2023

Mater. Res. Express

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This work addresses the issue of laser-induced white light generation by nano- and micro-diamond powder and the accompanying redox processes occurring at the surface of the particles. The broadband white light is generated by near infra-red continuous wave laser (975 nm) on micro and nano-diamond powders sealed in lightbulb-like devices. It is shown that the emission from diamond samples is a highly nonlinear process with apparent saturation close to 1 W of the optical excitation power. Multiband mechanism and mixed hybridization at particle surface are further discussed as a possible origin of the white light emission. Changes in the sp2/sp3 ratio upon the laser excitation are here discussed in terms of molecular dynamics simulations. Observed surface changes related to diamond graphitization are considered further as possible pathways for chemical reactions at the interface of the glass and diamond samples. Obtained results bring relevant physical premises according to the possible mechanism responsible for the white emission from diamond-like carbon materials, its mechanisms, and an essential figure of merit considering the diverse applicability of this phenomenon in various electronic devices.

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“…In our earlier experiments with methanol [ 36 ] and ethanol [ 37 ], we observed that the efficient generation of hydrogen occurred when graphene demonstrated intense white light emission under laser irradiation. This emission resulted from the multiphoton ionization of graphene.…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Generation of Hydrogen in Water by Using Graphene Target

et al. 2022

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A new method of hydrogen generation from water, by irradiation with CW infrared laser diode of graphene scaffold immersed in solution, is reported. Hydrogen production was extremely efficient upon admixing NaCl into water. The efficiency of hydrogen production increased exponentially with laser power. It was shown that hydrogen production was highly efficient when the intense white light emission induced by laser irradiation of graphene foam was occurring. The mechanism of laser-induced dissociation of water is discussed. It was found that hydrogen production was extremely high, at about 80%, and assisted by a small emission of O2, CO and CO2 gases.

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Laser induced hydrogen emission from ethanol with dispersed graphene particles

Cited by 7 publications

References 22 publications

Laser-Induced Broadband White Emission of NdAlO₃ Nanocrystals in Alcohols

Laser-Induced Broadband White Emission of NdAlO₃ Nanocrystals in Alcohols

Understanding continuous wave laser-induced chemical reactions at micro- and nano-diamond-glass interface under infrared excitation

Laser-Induced Generation of Hydrogen in Water by Using Graphene Target

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Laser induced hydrogen emission from ethanol with dispersed graphene particles

Cited by 7 publications

References 22 publications

Laser-Induced Broadband White Emission of NdAlO3 Nanocrystals in Alcohols

Laser-Induced Broadband White Emission of NdAlO3 Nanocrystals in Alcohols

Understanding continuous wave laser-induced chemical reactions at micro- and nano-diamond-glass interface under infrared excitation

Laser-Induced Generation of Hydrogen in Water by Using Graphene Target

Contact Info

Product

Resources

About

Laser-Induced Broadband White Emission of NdAlO₃ Nanocrystals in Alcohols

Laser-Induced Broadband White Emission of NdAlO₃ Nanocrystals in Alcohols