Designing and construction of a cobalt-metal-organic framework/heteroatoms co-doped reduced graphene oxide mesoporous nanocomposite based efficient electrocatalyst for chlorogenic acid detection

• Co-MOF decorated BP-RGO nanocomposite has been prepared through a simple hydrothermal method. • The sensor exhibits a wide linear range and low detection limit. • Co-MOF/BP-RGO for CGA detection is accessed by using coffee powder and green tea leaves as real-time samples. Metal-organic framework (MOF) based materials are a fascinating candidate in the sensor field. In this work, we successfully synthesized Co-MOF/BP-RGO nanocomposite by simple hydrothermal method and fabricated on glassy carbon electrode (GCE) for the detection of chlorogenic acid (CGA). The Co-MOF/BP-RGO nanocomposite was characterized by the powder x-ray diffraction (XRD), micro-Raman spectroscopy, Brunauer–Emmett–Teller (BET) surface area analysis, X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), and high-resolution transmission electron microscopy (HR-TEM). The electrochemical performance of Co-MOF/BP-RGO was investigated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). The Co-MOF/BP-RGO/GCE exposed good sensitivity, and great selectivity towards CGA under optimized conditions. The Co-MOF/BP-RGO/GCE exhibited a wide linear range and excellent LOD 0.001–391 µM and 0.014 µM respectively, and it exposed strong long-term stability also. Hence all these findings indicate that the Co-MOF/BP-RGO nanocomposite is a novel electrocatalyst for the highly sensitive CGA electrochemical sensor. Additionally, our proposed sensor was applied for the detection of CGA in the real samples, such as coffee powder and green tea leaves and it displayed excellent sensitivity and good recovery results.