3D CoMoO 4 nanoflake arrays decorated disposable pencil graphite electrode for selective and sensitive enzyme-less electrochemical glucose sensors

Three-dimensional (3D) cobalt molybdate (CoMoO 4 ) hierarchical nanoflake arrays on pencil graphite electrode (PGE) (CoMoO 4 /PGE) are actualized via one-pot hydrothermal technique. The morphological features comprehend that the CoMoO 4 nanoflake arrays expose the 3D, open, porous, and interconnected network architectures on PGE. The formation and growth mechanisms of CoMoO 4 nanostructures on PGE are supported with different structural and morphological characterizations. The constructed CoMoO 4 /PGE is operated as an electrocatalytic probe in enzyme-less electrochemical glucose sensor (ELEGS), confronting the impairments of cost- and time-obsessed conventional electrode polishing and catalyst amendment progressions and obliged the employment of a non-conducting binder. The wide-opened interior and exterior architectures of CoMoO 4 nanoflake arrays escalate the glucose utilization efficacy, whilst the intertwined nanoflakes and graphitic carbon layers, respectively, of CoMoO 4 and PGE articulate the continual electron mobility and catalytically active channels of CoMoO 4 /PGE. It jointly escalates the ELEGS concerts of CoMoO 4 /PGE including high sensitivity (1613 μA mM −1 cm −2 ), wide linear glucose range (0.0003–10 mM), and low detection limit (0.12 µM) at a working potential of 0.65 V (vs . Ag/AgCl) together with the good recovery in human serum. Thus, the fabricated CoMoO 4 /PGE extends exclusive virtues of modest electrode production, virtuous affinity, swift response, and excellent sensitivity and selectivity, exposing innovative prospects to reconnoitring the economically viable ELEGSs with binder-free, affordable cost, and expansible 3D electrocatalytic probes. Graphical abstract