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

Authors :
Miroslav Vavrecka
Radek Zboril
Aristides Bakandritsos
Mahdi Shahrezaei
Y. Rambabu
Seyyed Mohammad Hossein Hejazi
Alberto Naldoni
Selda Oezkan
Stepan Kment
Patrik Schmuki
Source :
Catalysts, Volume 10, Issue 6, Catalysts, Vol 10, Iss 717, p 717 (2020)
Publication Year :
2020
Publisher :
Multidisciplinary Digital Publishing Institute, 2020.

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.

Details

Language :
English
ISSN :
20734344
Database :
OpenAIRE
Journal :
Catalysts
Accession number :
edsair.doi.dedup.....7dd44cbf14c40992b9b3f54d71750bbc
Full Text :
https://doi.org/10.3390/catal10060717