Silicon Nanowires´ Based Photoanode for Efficient Hydrogen Evolution.

0497723 - ÚCHP 2019 RIV US eng J - Journal Article
Dytrych, Pavel - Dřínek, Vladislav - Bumba, Jakub - Kaštánek, František - Šolcová, Olga
Silicon Nanowires´ Based Photoanode for Efficient Hydrogen Evolution.
International Journal of Hydrogen Energy. Roč. 43, č. 39 (2018), s. 18136-18141. ISSN 0360-3199. E-ISSN 1879-3487
R&D Projects: GA ČR GA15-14228S; GA MŠMT(CZ) EF16_027/0007931
Institutional support: RVO:67985858
Keywords : hydrogen storage * hydrogen evolution reaction * metal nanoparticles
OECD category: Chemical process engineering
Impact factor: 4.084, year: 2018

The solar driven photo-electrolysis of water for hydrogen and nanoparticles formation from electrolyte with corresponding metal salts was investigated. The photoanode consisted of a thin layer of silicon nanowires deposited on molybdenum and a platinum wire as the cathode was used. The prepared photo-anodes were stable up to 0.3 V against the saturated Ag/AgCl electrode without any signs of gaseous oxygen evolution. This photo-electrochemical system enhanced the nanoparticle formation during the illumination phase accompanied with lowering the external potential needed. The present results show that the hydrogen in statu nascendii is formed during the illumination of photoanode, which causes the formation of nanoparticles by reduction of metal salts. During the photo drive electrolysis is the hydrogen stored in/on forming nanoparticles. The size of nanoparticles can be determined by time and an external bias value inserted between the working and platinum electrode in a classical three electrode system. It was confirmed that the formation of nanoparticles was limited by diffusional processes of hydrogen in statu nascendii in electrolyte, which is in agreement with literature.
Permanent Link: http://hdl.handle.net/11104/0290233