Nickel nanoparticles incorporated Co, N co-doped carbon polyhedron derived from core-shell ZIF-8@ZIF-67 for electrochemical sensing of nitrite

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2021-04, Vol.887, p.115163, Article 115163
• Main Authors: Zhang, Wei, Ge, Chuang-ye, Jin, Lei, Yoon, Sujin, Kim, Whangi, Xu, Guang-ri, Jang, Hohyoun
• Format: Article
• Language: English
• Subjects: Carbon; Catalytic activity; Chemical sensors; Cobalt; Core-shell structure; Diffusion coefficient; Electrochemical sensor; Metal-organic frameworks; Nanoparticles; Nickel; Nickel nanoparticles; Nitrite; Nitrogen dioxide; Oxidation; Polyhedra; Pyrolysis; Selectivity; Sensors; Zeolites; Zeolitic imidazolate framework
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2021.115163

Herein, a novel electrochemical sensor based on core-shell zeolitic imidazolate framework-8 @zeolitic imidazolate framework-8 (ZIF-8@ZIF-67) derived cobalt and nitrogen co-doped carbon polyhedron (Co, N-CP) and electrodeposited nickel nanoparticles (Ni NPs) was developed for nitrite (NO2−) detection. The Co, N-CP was prepared by direct pyrolysis of the core-shell structured ZIF-8@ZIF-67 at Zn/Co at 900 °C in an Ar atmosphere. Ni NPs were electrodeposited on Co, N-CP modified glass carbon electrode (Co, N-CP/GCE) using potentiostatic method. The Ni NPs decorated Co, N-CP displays a synergetic electrocatalytic effect for the oxidation of NO2− due to the large surface area and ordered porosity of Co, N-CP integrating the good conductivity and catalytic activity of Ni NPs. The proposed sensor exhibited good electrocatalytic activity, sensitivity and selectivity towards NO2− with the catalytic rate constant (Kcat) of 5.49 × 106 M−1 s−1 and the diffusion coefficient (D) of 5.12 × 10−6 cm2 s−1. The Ni/Co, N-CP/GCE showed a wide linear response (5–1000 μM) and a low detection limit (LOD) of 0.094 μM (S/N = 3). Additionally, the sensor was successfully applied to monitor NO2− in real samples with satisfactory recoveries, indicating that Ni/Co, N-CP could be a promising candidate for sensing of other biologically important molecules.