Capillary-driven microchip integrated with nickel phosphide hybrid-modified electrode for the electrochemical detection of glucose.

Transition metal phosphides with properties similar to platinum metal have received increasing attention for the non-enzymatic detection of glucose. However, the requirement of highly corrosive reagent during sample pretreatment would impose a potential risk to the human body, limiting their practical applications. In this study, we report a self-powered microfluidic device for the non-enzymatic detection of glucose using nickel phosphide (Ni 2 P) hybrid as the catalyst. The Ni 2 P hybrid is synthesized by pyrolysis of metal-organic framework (MOF)-based precursor and in-situ phosphating process, showing two linear detection ranges (1 μM–1 mM, 1 mM–6 mM) toward glucose with the detection limit of 0.32 μM. The good performance of Ni 2 P hybrid for glucose is attributed to the synergistic effect of Ni 2 P active sites and N-doped porous carbon matrix. The microchip is integrated with a NaOH-loaded paper pad and a capillary-based micropump, enabling the automatic NaOH redissolution and delivery of sample solution into the detection chamber. Under the optimized condition, the Ni 2 P hybrid-based microchip realized the detection of glucose in a user-friendly way. Besides, the feasibility of using this microchip for glucose detection in real serum samples has also been validated. This article presents a facile fabrication method utilizing a MOF template to synthesize a Ni 2 P hybrid catalyst. By leveraging the synergy between the Ni 2 P active sites and the N-doped carbon matrix, an exceptional electrochemical detection performance for glucose has been achieved. Additionally, a self-powered chip device has been developed for convenient glucose detection based on the pre-established high pH environment on the chip. [Display omitted] • A facile method was developed to synthesize nickel phosphide hybrid for glucose sensing. • A self-powered microfluidic device was designed to realize the automatic sample delivery. • High pH environment was pre-established on the chip for detection operation. • The microchip was successfully applied to determine the glucose concentration in real samples. [ABSTRACT FROM AUTHOR]