Sulphides of the cobalt doped Ni7S6 type for glucose, hydrogen peroxide and nitrite sensing platform

Sulphides of the cobalt doped Ni7S6 type, namely: Ni7-XCoXS6 (x=0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5) were synthesized by hydrothermal method. All the compounds of interest were compared by electrochemical testings. And the results demonstrated that the best material was Ni5.5Co1.5S6.The sensor based on Ni5.5Co1.5S6 exhibited better electrocatalytic performance for glucose, hydrogen peroxide and nitrite than that of pure Ni7S6. The superior catalytic activities of Ni5.5Co1.5S6 originated from the synergistic interaction between Co and Ni ions in the aloe -like Ni5.5Co1.5S6 materials. The sensor exhibited excellent performances in selectivity, stability and reproducibility. Furthermore, when the sensor was used for the detection of human serum samples, hydrogen peroxide antibacterial lotion and water samples (lake/tap/pickle water), the sensor showed good recovery rate. And the test results are close to the results of traditional or commercial detection methods, indicating that the sensor had potential application in real samples. (C) 2017 Elsevier B.V. All rights reserved.