title: Comparison of NiS2 and α-NiS hollow spheres for supercapacitors, non-enzymatic glucose sensors and water treatment.
abstract: NiS2 hollow spheres are successfully prepared by a one-step template free method. Meanwhile, α-NiS hollow spheres can also be synthesized via the calcination of the pre-obtained NiS2 hollow spheres at 400 °C for 1 h in air. The electrochemical performances of the as-prepared NiS2 and α-NiS hollow sphere products are evaluated. When used for supercapacitors, compared with NiS2 hollow spheres, the α-NiS hollow sphere electrode shows a large specific capacitance of 717.3 F g(-1) at 0.6 A g(-1) and a good cycle life. Furthermore, NiS2 and α-NiS hollow spheres are successfully applied to fabricate non-enzymatic glucose sensors. In particular, the α-NiS hollow spheres exhibit good catalytic activity for the oxidation of glucose, a fast amperometric response time of less than 5 s, and the detection limit is estimated to be 0.08 μM. More importantly, compared with other normally co-existing interfering species, such as ascorbic acid, uric acid and dopamine, the electrode modified with α-NiS hollow spheres shows good selectivity. Moreover, the α-NiS hollow spheres also present good capacity to remove Congo red organic pollutants from wastewater by their surface adsorption ability.
authors.affiliation: College of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, 455000 Henan, P. R. China. chengzhenweichem@126.com huanpangchem@hotmail.com.
authors.forename: Chengzhen
authors.initials: C
authors.lastname: Wei
authors.forename: Cheng
authors.initials: C
authors.lastname: Cheng
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Cheng
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Yazhou
authors.initials: Y
authors.lastname: Xu
authors.forename: Weimin
authors.initials: W
authors.lastname: Du
authors.forename: Huan
authors.initials: H
authors.lastname: Pang
mesh_terms: D025802:Electric Capacitance; D055664:Electrochemical Techniques / Q000379:methods; D005947:Glucose / Q000032:analysis*; D054118:Nanospheres / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D009532:Nickel; C017558:nickel sulfide; D005947:Glucose