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. 2022 Jan 22;27(3):718.
doi: 10.3390/molecules27030718.

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

Wieslaw Strek  1 , Przemysław Wiewiórski  1 , Włodzimierz Miśta  1 , Robert Tomala  1 , Mariusz Stefanski  1
Affiliations

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

Wieslaw Strek et al. Molecules. .

Abstract

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.

Keywords: graphene foam; hydrogen generation; laser irradiation; white light emission.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The emission spectra of laser-irradiated graphene foam with different excitation laser power in saline (a,b) and distilled water (c,d). The narrow dips observed at ~589 nm in the emission spectrum of saline water may be assigned to the Na+ ions due to the dissociation of NaCl. They were not seen for distilled water.
Figure 2
Figure 2
The power dependence of gas products in (a–d) and without (e–h) the presence of Ar, resulting from laser irradiation of H2O +1% NaCl.
Figure 3
Figure 3
Hydrogen evolution rate from saline and distilled water by laser irradiation of graphene aerogel.
Figure 4
Figure 4
The increase in total gas pressure during water splitting in the closed cuvette after long-time exposure.
Figure 5
Figure 5
Experimental set-up for hydrogen generation from water, using graphene as a photocatalyst (a); Photo of the cuvette of water with immersed graphene scaffold irradiated with 980 nm laser beam (b).
See this image and copyright information in PMC

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