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Improved performance of photoelectrochemical water oxidation from nanostructured hematite photoanode with an immobilized molecular cobalt salophen catalyst.
- Source :
-
Journal of Materials Science . Sep2020, Vol. 55 Issue 27, p12864-12875. 12p. 2 Diagrams, 3 Graphs. - Publication Year :
- 2020
-
Abstract
- The development of molecule-semiconductor hybrid photoanodes is considered to possess the potential in fabricating practical photoelectrochemical (PEC) devices with high efficiency. Herein, α-Fe2O3 photoanode with morphology of highly interconnected and aligned nanorod arrays have been successfully grown on fluorine-doped tin oxide, and its PEC activity toward water oxidation was facilely optimized by controlling the electrodeposition time. And then, this photoanode was modified with a Co(II) salophen complex with pyrene moiety via a hydrophobic interaction to construct a hybrid photoanode. The obtained photoanode manifests remarkable enhanced PEC performance relative to pristine α-Fe2O3, affording a remarkable photocurrent response of 0.7 mA cm−2 at 1.23 V versus reversible hydrogen electrode and a low catalytic onset potential of 0.93 V in a neutral aqueous solution under simulated sunlight illumination (100 mW cm−2). Furthermore, the durability test indicates that this hybrid photoanode possesses good stability and a Faradaic efficiency of nearly 100% for oxygen evolution. The superior PEC performance is mainly due to the synergistic contribution of the Co(II) salophen co-catalyst and the α-Fe2O3 nanorod arrays, in which the co-catalyst greatly suppresses the surface holes/electrons recombination and accelerates the surface oxygen evolution reaction kinetics. One novel hybrid photoanode integrating α-Fe2O3 nanorod arrays semiconductor with Co(II) salophen co-catalyst is facilely fabricated and demonstrates remarkable photoelectrochemical performance toward water oxidation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 55
- Issue :
- 27
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 144297145
- Full Text :
- https://doi.org/10.1007/s10853-020-04971-2