Electrochemical sensors based on platinum-coated MOF-derived nickel-/N-doped carbon nanotubes (Pt/Ni/NCNTs) for sensitive nitrite detection

• Published in: Analytical sciences 2023-08, Vol.39 (8), p.1297-1306
• Main Authors: Wang, Shuyue, Yin, Haoyong, Qu, Kaige, Wang, Ling, Gong, Jianying, Zhao, Shumin, Wu, Shengji
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Original Paper
• ISSN: 0910-6340; 1348-2246
• DOI: 10.1007/s44211-023-00336-2

As excess nitrite has a serious threat to the human health and environment, constructing novel electrochemical sensors for sensitive nitrite detection is of great importance. In this report, platinum nanoparticles were deposited on nickel-/N-doped carbon nanotubes, which were obtained through a self-catalytically grown process with Ni-MOF as precursors. The as-prepared Pt/Ni/NCNTs were applied as amperometric sensors and presented superior sensing properties for nitrite detection. Benefiting from the synergy of Pt and Ni/NCNTs, Pt/Ni/NCNTs displayed much wider detection ranges (0.5–40 mM and 40–110 mM) for nitrite sensing. The sensitivity is 276.92 μA mM −1  cm −2 and 224.39 μA mM −1  cm −2 , respectively. The detection limit is 0.17 μM. The Pt/Ni/NCNTs sensors also showed good feasibility for nitrite sensing in real samples (milk and peach juice) analysis. The active Pt/Ni/NCNTs composites and facile fabrication technique may provide useful strategies to develop other sensitive nitrite sensors. Graphical abstract