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The nature of photocatalytic hydrogen generation on silicon nanowires prepared by MAWC
Ist Teil von
International journal of hydrogen energy, 2024-06, Vol.71, p.42-47
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2024
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Highly n-doped silicon nanowires (SiNWs) exhibit excellent hydrogen generation. Our results indicate three hydrogen generation possibilities, i.e. SiNWs oxidation, photocatalysis and the cleavage of dangling H bonds, are jointly responsible for the efficient hydrogen generation. Oxidation accounts for about 80% of total hydrogen, photocatalysis contributes less than 20% of total hydrogen, and about 0.1% of total hydrogen is from cleavage of dangling H bonds. SiNWs were oxidized in water and form SiOx (0 < X < 2) thin layer. Furthermore, the ratio of photo-generated hydrogen to photo-generated oxygen is about 2.4:1. It suggests that photocatalysis appears to be a process of water splitting. This study is significant to reveal the mechanism of hydrogen production on SiNWs prepared by Metal-Assisted Wet Chemical Etching (MAWC).
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•SiNWs were reported to produce H2 in water as photocatalyst. However, the mechanism of hydrogen generation on SiNWs has not been clarified. Is it real water splitting? As far as We know, there is no clear conclusion on this issue at present. A accurate numerical computation of hydrogen and oxygen generation was given in the manuscript. Our results indicate SiNWs oxidation, photocatalysis and the cleavage of dangling H bonds, are jointly responsible for the efficient hydrogen generation. The ratio of photo-generated hydrogen to photo-generated oxygen is about 2.4:1, it is close to the theoretical ration of water splitting.