Abstract
The synthesis and characterization of highly stable and conductive F:SnO 2 (FTO) nanopyramid arrays are investigated, and their use as scaffolds for water splitting is demonstrated. Current densities during the oxygen evolution reaction with a NiFeO x catalyst at 2 V vs reversible hydrogen electrode were increased 5-fold when substituting commercial FTO (TEC 15) by nanostructured FTO scaffolds. In addition, thin α-Fe 2O 3 films (∼50 nm thick) were employed as a proof of concept to show the effect of our nanostructured scaffolds during photoelectrochemical water splitting. Double-layer capacitance measurements showed a drastic increase of the relative electrochemically active surface area for the nanostructured samples, in agreement with the observed photocurrent enhancement, whereas UV-vis spectroscopy indicates full absorption of visible light at wavelengths below 600 nm.
Original language | English |
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Pages (from-to) | 36485-36496 |
Number of pages | 12 |
Journal | ACS Applied Materials & Interfaces |
Volume | 11 |
Issue number | 40 |
DOIs | |
Publication status | Published - 9 Oct 2019 |
Keywords
- nanostructuring
- photoelectrode
- spectroscopy
- spray pyrolysis
- water splitting