Journal
ACS APPLIED NANO MATERIALS
Volume 5, Issue 4, Pages 5535-5543Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.2c00521
Keywords
photoelectrochemical sensor; TiO2 nanotube arrays; nickel-cobalt layered double hydroxides; photoelectrode; hexavalent chromium
Funding
- National Natural Science Foundation of China [21675163]
- top priority program of One-Three-Five Strategic Planning of Lanzhou Institute of Chemical Physics, CAS
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In this study, a nickel-cobalt layered double hydroxides modified TiO2 nanotube arrays photoelectrode was fabricated and used for constructing a PEC sensing platform for Cr(VI) detection. The sensor showed simplicity, excellent selectivity and sensitivity, a wide linearity range, and high stability.
Developing stable and highly efficient photoactive materials is desirable to their extensive application in photoelectrochemical (PEC) sensors. Herein, a nickel-cobalt layered double hydroxides (NiCo-LDHs) cocatalyst-modified TiO2 nanotube arrays (TiO2 NTAs) photoelectrode (NiCo-LDHs/TiO2NTAs/Ti) was fabricated and used to construct a PEC sensing platform for hexavalent chromium, Cr(VI), detection. The resultant NiCo-LDHs/TiO2NTAs/Ti showed higher photocatalytic water-splitting activity than the pristine TiO2NTAs/Ti, and an enhanced anodic photocurrent was realized at a potential of 0 V (vs Ag/AgCl). On the basis of changes of the photocurrent signal induced by the interaction between photogenerated electrons and Cr(VI) as an effective electron scavenger in solution, a PEC sensor for Cr(VI) detection was developed and showed a linearly decreased photocurrent with increasing Cr(VI) concentration between 0.5-20 mu M, 20-400 mu M, and 400-1800 mu M with a 0.12 mu M detection limit under the optimized test conditions. The method showed simplicity, excellent selectivity and sensitivity, a wide linearity range, and high stability. The prepared PEC sensor succeeded in the Cr(VI) detection of river water and tap water samples, and it presented good applicability.
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