Silicon sub-oxides as driving force for efficient light-enhanced hydrogen generation on silicon nanowires

in: Small (2021)
Ming, Tingsen; Turishchev, S. Yu.; Schleusener, Alexander; Parinova, V.E.; Koyuda, D.A.; Chuvenkova, Olga; Schulz, Martin; Dietzek, Benjamin; Sivakov, Vladimir
We report efficient light-stimulated hydrogen generation from top-down produced highly doped n-type silicon nanowires (SiNWs) with silver nanoparticles (AgNPs) in water-containing medium under white light irradiation. We observed that SiNWs with AgNPs generate at least 2.5 times more hydrogen than SiNWs without AgNPs. Our results, based on vibrational, UV/VIS, and X-ray spectroscopy studies, strongly suggest that the sidewalls of the SiNWs are covered by silicon sub-oxides, by up to a thickness of 120 nm, with wide bandgap semiconductor properties that are similar to those of titanium dioxide and remain stable during hydrogen evolution in a water-containing medium for at least 3 h of irradiation. We found, based on synchrotron studies, that the increase in the silicon band gap is related to the energetically beneficial position of the valence band in nanostructured silicon, which renders these promising structures for efficient hydrogen generation.

Third party cookies & scripts

This site uses cookies. For optimal performance, smooth social media and promotional use, it is recommended that you agree to third party cookies and scripts. This may involve sharing information about your use of the third-party social media, advertising and analytics website.
For more information, see privacy policy and imprint.
Which cookies & scripts and the associated processing of your personal data do you agree with?

You can change your preferences anytime by visiting privacy policy.