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Open AccessArticle

Multi-Leg TiO2 Nanotube Photoelectrodes Modified by Platinized Cyanographene with Enhanced Photoelectrochemical Performance

1
Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University Olomouc, 17. listopadu 1192/12, 771 46 Olomouc, Czech Republic
2
Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, D-91058 Erlangen, Germany
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(6), 717; https://doi.org/10.3390/catal10060717
Received: 27 May 2020 / Revised: 12 June 2020 / Accepted: 23 June 2020 / Published: 26 June 2020
Highly ordered multi-leg TiO2 nanotubes (MLTNTs) functionalized with platinized cyanographene are proposed as a hybrid photoelectrode for enhanced photoelectrochemical water splitting. The platinized cyanographene and cyanographene/MLTNTs composite yielded photocurrent densities 1.66 and 1.25 times higher than those of the pristine MLTNTs nanotubes, respectively. Open circuit VOC decay (VOCD), electrochemical impedance spectroscopy (EIS), and intensity-modulated photocurrent spectroscopy (IMPS) analyses were performed to study the recombination rate, charge transfer characteristics, and transfer time of photogenerated electrons, respectively. According to the VOCD and IMPS results, the addition of (platinized) cynographene decreased the recombination rate and the transfer time of photogenerated electrons by one order of magnitude. Furthermore, EIS results showed that the (platinized) cyanographene MLTNTs composite has the lowest charge transfer resistance and therefore the highest photoelectrochemical performance. View Full-Text
Keywords: multi-leg TiO2 nanotube; platinized cyanographene; photoanode; photoelectrochemical properties; charge transfer multi-leg TiO2 nanotube; platinized cyanographene; photoanode; photoelectrochemical properties; charge transfer
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Shahrezaei, M.; Hejazi, S.M.H.; Rambabu, Y.; Vavrecka, M.; Bakandritsos, A.; Oezkan, S.; Zboril, R.; Schmuki, P.; Naldoni, A.; Kment, S. Multi-Leg TiO2 Nanotube Photoelectrodes Modified by Platinized Cyanographene with Enhanced Photoelectrochemical Performance. Catalysts 2020, 10, 717.

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