Synthesis of porous nanododecahedron Co3O4/C and its application for nonenzymatic electrochemical detection of nitrite

• Published in: Advanced Powder Technology Vol. 30; no. 10; pp. 2083 - 2093
• Main Authors: Qiu, Weiwei, Tanaka, Hidekazu, Gao, Feng, Wang, Qingxiang, Huang, Mingqiang
• Format: Journal Article
• Language: English; Japanese
• Published: Elsevier B.V 01.10.2019; Elsevier BV
• Subjects: Co3O4/C; Nitrite; Nonenzymatic biosensor; ZIF-67; Nitrite; Nonenzymatic biosensor; ZIF-67; Co3O4/C
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2019.06.022

Graphical synthesis of Co3O4/C nanocomposite and its application as a nonenzymatic electrocatalyst for nitrite. [Display omitted] •ZIF-67 acts as an ideal sacrificial template and converted to Co3O4/C with regular shape.•Co3O4/C composite exhibits highly porous, fluffy and highly surface area.•Co3O4/C composite shows high electrocatalytic activity toward NO2−.•An ultralow detection limit of 1.21 nM of the fabricated sensor for NO2− was achieved. Porous nanododecahedron of Co3O4/C has been synthesized by calcination of the ZIF-67 in air at 400 °C and then be used as electrode material for fabricating a highly sensitive and low overpotential sensor of nitrite ion (NO2−). The structure and morphology characterization show that ZIF-67 behaves as an ideal sacrificial template for preparing Co3O4/C with regular shape. The two components of Co3O4 and carbon are uniformly distributed in the composite. Electrochemical analysis shows that the excellent electrocatalysis performance toward the oxidation of NO2− is based on the synergy of Co3O4 and carbon in the nanocomposite. At NO2− concentration from 2 nM to 8 mM, a fast response time within 3 s is revealed and 1.21 nM of detection limit is achieved. The sensor is also reliable to analysis of NO2− existed in the real samples of soil leaching liquid and macrophage supernate.