Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 281, Issue -, Pages 182-190Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.10.074
Keywords
Pt nanoclusters; Co oxides; Nanoporous hybrid; Nitrite; Electrochemical sensor
Funding
- Shandong Provincial Natural Science Joint Found with Universities and Scientific Research Institution [ZR2018LB022]
- Project of Shandong Province Higher Educational Science and Technology Program [J18KA097]
- Special Project of International Cooperative Research [450401]
- Special Funds for Taishan Scholars Project
- Ten Thousand Talent Program of China
- National Natural Science Foundation of China [31771933]
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A novel, low-cost and mutually stable Pt nanocluster doped nanoporous CoO (Pt/CoO) has been successfully designed and synthesized by facilely dealloying Al85Co14Pt1 ternary alloy in alkaline solution. Electronic microscope images demonstrated the Pt nanoclusters are doped inside of the CoO crystal structure and they were mutually stabilized with each other, resulting in a high electrocatalytical activity even if the content of Pt was extremely low. A new electrochemical sensor was then constructed by modifying the Pt/CoO nanohybrid on a glassy carbon electrode, which enabled amperometric sensing of nitrite with wide linear ranges of 0.2 mu M-3.67mM and 3.67-23.7 mM, high sensitivities of 901.4 and 408.5 mu AmM-1 cm(-2) as well as a low detection limit of 0.067 mu M (S/N = 3). Furthermore, the sensor showed good selectivity, stability and reproducibility towards nitrite detection. The feasibility of the electrochemical sensor was proved by successful detection of nitrite in real samples.
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