A COMPARISON OF HYDROGEN PRODUCTION BY WATER SPLITTING ON THE SURFACE OF α‐, δ‐ AND γ‐Al₂O₃

Abstract

Water splitting is becoming one of the most important processes for producing green fuel hydrogen. Among various materials, alumina provides the best surface for water splitting to generate green energy hydrogen. Therefore, radiationcatalytic and radiation-thermocatalytic activities of the polymorphic forms of Al 2 O 3 (α-, δ-, γ-) in the water decomposition process were studied at various temperatures. It is established that γ-Al 2 O 3 has relatively high radiation-catalytic properties in the process of water decomposition. The maximum yields of the radiation-chemical molecular hydrogen at 873 K for 30 hrs were 4.5, 5.8, and 7.0 N(H 2 ) × 10 À 18 molecules/g for α-, δand γ-Al 2 O 3 ; indicating the best performance of γ-Al 2 O 3 . The pattern of accumulation of localized states of non-equilibrium charge carriers in polymorphic forms of γ-Al 2 O 3 was determined. Furthermore, the proposed mechanisms of energy transfer and lengths of energy transfer in radiation-heterogeneous processes of water decomposition were determined. The developed method may be used to produce hydrogen fuel on a large scale.

Radiation chemical processes in the water layer on the surface of PuO2

“…There have been a large number of measurements of H 2 formation during irradiation of water adsorbed on oxide surfaces other than PuO 2 as well as slurries of oxide powders (Nakashima and Masaki, 1996;Petrik et al, 2001;LaVerne and Tandon, 2003). This field was reviewed by LaVerne et al (2011) and by Le Caër (2011) in 2011 and the topic remains an active area of research with significant further publications (Ali et al, 2012;Fourdrin et al, 2013;Lainé et al, 2017;Yin et al, 2019;McGrady et al, 2021;Conrad et al, 2022;McGrady et al, 2023). In the first major systematic study of oxides, Petrik et al (Petrik et al, 2001) .…”

Hydrogen production on nano Al2O3 surface by water splitting using gamma radiation

“…[1][2][3] Among the many methods available, water splitting is considered an inexpensive source of hydrogen generation. [4][5][6][7] A solid surface is required to split the water for hydrogen generation. 8 There is growing interest in the field of radiochemical transformation of the water on the surface of nano-catalysts.…”

“…The demand for green energy hydrogen is continuously increasing due to climate‐related issues and the risk of fossil fuel exhaustion in the future 1‐3 . Among the many methods available, water splitting is considered an inexpensive source of hydrogen generation 4‐7 . A solid surface is required to split the water for hydrogen generation 8 .…”