1. Multi-Leg TiO2 Nanotube Photoelectrodes Modified by Platinized Cyanographene with Enhanced Photoelectrochemical Performance
- Author
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Miroslav Vavrecka, Radek Zboril, Aristides Bakandritsos, Mahdi Shahrezaei, Y. Rambabu, Seyyed Mohammad Hossein Hejazi, Alberto Naldoni, Selda Oezkan, Stepan Kment, and Patrik Schmuki
- Subjects
Materials science ,Technische Fakultät ,Composite number ,02 engineering and technology ,Electron ,lcsh:Chemical technology ,010402 general chemistry ,01 natural sciences ,Catalysis ,multi-leg TiO2 nanotube ,lcsh:Chemistry ,multi-leg TiO(2)nanotube ,lcsh:TP1-1185 ,Physical and Theoretical Chemistry ,Spectroscopy ,Photocurrent ,business.industry ,Open-circuit voltage ,charge transfer ,photoanode ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Dielectric spectroscopy ,lcsh:QD1-999 ,Water splitting ,Optoelectronics ,ddc:620 ,0210 nano-technology ,business ,platinized cyanographene ,photoelectrochemical properties ,Order of magnitude - Abstract
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.
- Published
- 2020
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