Defect Surface Engineering of Hollow NiCo2S4 Nanoprisms towards Performance-Enhanced Non-Enzymatic Glucose Oxidation

Abstract

Transition metal sulfides have been explored as electrode materials for non-enzymatic detection. In this work, we investigated the effects of phosphorus doping on the electrochemical performances of NiCo2S4 electrodes (P-NiCo2S4) towards glucose oxidation. The fabricated non-enzymatic biosensor displayed better sensing performances than pristine NiCo2S4, with a good sensitivity of 250 µA mM−1 cm−2, a low detection limit (LOD) of 0.46 µM (S/N = 3), a wide linear range of 0.001 to 5.2 mM, and high selectivity. Moreover, P-NiCo2S4 demonstrated its feasibility for glucose determination for practical sample testing. This is due to the fact that the synergetic effects between Ni and Co species, and the partial substitution of S vacancies with P can help to increase electronic conductivity, enrich binary electroactive sites, and facilitate surface electroactivity. Thus, it is found that the incorporation of dopants into NiCo2S4 is an effective strategy to improve the electrochemical activity of host materials.

Portable Amperometric Glucose Detection based on NiS/CuS Nanorods Integrated with a Smartphone Device

“…Recently, transition metal sulfides have received more attention in electrocatalytic application as they have some unique advantages compared with their oxides. Due to the replace of O with S, transition metal sulfides have more flexible structures with an elongation of chemical bonds, which results in outstanding electronic conductivity and abundant redox chemical properties and eventually benefits electron transport [19,20]. Such as bamboo-like Ni 3 S 2 @NCNT displayed facilitated electronic transfer and enhanced catalytic performances for glucose oxidation [21].…”