Back to Search
Start Over
FeOOH Modified H-TiO2 Nanorods Array (NRA) for Stable and Improved Low-Bias Photoelectrochemical Water Splitting.
- Source :
- Journal of The Electrochemical Society; Aug2021, Vol. 168 Issue 8, p878-884, 7p
- Publication Year :
- 2021
-
Abstract
- Iron oxyhydroxide (FeOOH) was implemented as a low-cost, stable, and earth-abundant catalyst on hydrogenated titania nanorods array (H-TiO<subscript>2</subscript>/FeOOH), for photoelectrochemical water splitting applications. The hydrogenation treatment enhanced the maximum photocurrent density delivered by the titania-based photoanode (from 0.65 mA cm<superscript>-2</superscript> to 1 mA cm<superscript>-2</superscript> at +1.23 V vs RHE) while the exploitation of FeOOH resulted in a significant improvement in the photoelectrochemical activity at low bias. The optimized photoelectrode showed ~0.6 mA cm<superscript>-2</superscript> at +0.4 V vs RHE, with a saturation current density of 1.05 mA cm<superscript>-2</superscript>. Insights on the role of FeOOH were revealed by electrochemical impedance and photoluminescence measurements, suggesting a reduction of the charge transfer resistance at the electrolyte interface and a lower frequency of recombination events. The H-TiO<subscript>2</subscript>/FeOOH photoelectrode showed a maximum applied bias photon-to-current efficiency (ABPE) of 0.68% with a 0.3 V bias, while for the bare TiO<subscript>2</subscript> nanorods array the maximum value of 0.4% was found at a bias of 0.4 V. A stable photocurrent was measured in 1 M NaOH solution through a 5 h test at 1.23 V vs RHE, under illumination (1 sun), suggesting the compatibility of FeOOH in highly alkaline solutions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134651
- Volume :
- 168
- Issue :
- 8
- Database :
- Supplemental Index
- Journal :
- Journal of The Electrochemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 152416225
- Full Text :
- https://doi.org/10.1149/1945-7111/ac1b4b