| Summary: | 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 NiCo<sub>2</sub>S<sub>4</sub> electrodes (P-NiCo<sub>2</sub>S<sub>4</sub>) towards glucose oxidation. The fabricated non-enzymatic biosensor displayed better sensing performances than pristine NiCo<sub>2</sub>S<sub>4</sub>, with a good sensitivity of 250 µA mM<sup>−1</sup> cm<sup>−2</sup>, 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-NiCo<sub>2</sub>S<sub>4</sub> 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 NiCo<sub>2</sub>S<sub>4</sub> is an effective strategy to improve the electrochemical activity of host materials.
|
|---|