Journal
MICROCHIMICA ACTA
Volume 184, Issue 10, Pages 4065-4072Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-017-2441-7
Keywords
Photoelectrochemical sensor; Titanium dioxide nanotube arrays; Cuprous oxide; Sulfide ions
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Funding
- NSFC [21475047, 21673083]
- Science and Technology Project of Guangdong Province [2016A050502048, 2016A010104013, 2016B030303010]
- Program for the Top Young Innovative Talents of Guangdong Province [2016TQ03N305]
- Open Research Fund of Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University [CCSU-XT-06]
- Foundation for High-level Talents in South China Agricultural University
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This work describes a photoelectrochemical for sensing sulfide method that is based on TiO2 nanotubes loaded with Cu2O particles (Cu2O/TiNTs). The narrow band gap of Cu2O and the heterostructure at the interface between Cu2O and TiO2 in the Cu2O/TiNTs significantly enhance visible light absorption and charge separation, and these results in an improved photocurrent of the Cu2O/TiNT electrode under irradiation with visible light (> 400 nm). In the presence of sulfide, Cu7S4 is formed on the surface of the Cu2O/TiNT, this leading to a decrease in the photocurrent on the electrode. At a potential of 0.0 V, the photocurrent of the Cu2O/TiNTs before and after immersing it into 300 mu M sulfide solution is 1086 and 310 mu A cm(-2), respectively. The findings were used to design a photoelectrochemical sulfide sensor. Under optimum conditions and at a pH value of 7.0, the change in photocurrent varies linearly in the 1 to 300 mu M sulfide concentration range with a 0.6 mu M detection limit. The sensor was applied to the determination of sulfide in spiked real water samples.
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