+44-1518-081136Core-shell SrTaO2N nanowire photoanode for photoelectrochemical water oxidation
2nd International Conference on Biomaterials and Nanomaterials & Materials Physics and Materials Science
May 20-21, 2019 | Vienna, Austria
Adam Slabon
Tockholm University, Sweden
Posters & Accepted Abstracts : Mater Sci Nanotechnol
Abstract:
Solar fuel generation in the form of hydrogen derived
directly from water represents an environment-friendly
technology to obtain clean energy. Oxynitrides are promising
candidates for photoanodes in water-splitting cells due to
their tunable bandgaps and low cost. Especially quaternary
oxynitrides exhibit small band gap values, between 1.8 and
2.3 eV, suggesting their potential for high solar-to-hydrogen
efficiencies.
Light absorbers in a strongly anisotropic morphology, e.g.
nanowires, enable to decouple the long axis responsible for
high light harvesting from the orthogonal axis responsible
for charge transport. This results in efficient light harvesting
while simultaneously ensuring improved charge-carrier
conductivity. Most nitrides and oxynitrides are usually
obtained in the form of microcrystals by nitridation of a
precursor oxide phase. Although Ta3N5 nanowires can be
synthesized by nitridation of Ta2O5 nanowires, this method
cannot be applied to quaternary oxynitrides.
The perovskite-related oxynitride SrTaO2N is a prospective
photoanode candidate with favourable band-edge positions.
We have synthesized SrTaO2N nanowires by hydrothermal
synthesis on a tantalum substrate and nitridation under
flowing ammonia and hydrogen. This is the first trial of a
SrTaO2N photoanode based on nanowires.
Biography:
E-mail:
adam.slabon@mmk.su.sePDF HTML