title: Hollow nanospheres constructed by CoS2 nanosheets with a nitrogen-doped-carbon coating for energy-storage and photocatalysis.
abstract: Hierarchical CoS2 hollow nanospheres (HSs) with a nitrogen-doped-carbon coating (NC@CoS2 ) are fabricated by a simple solution method. The uniform 300 nm-sized NC@CoS2 HSs are composed of ultrathin nanosheet subunits with a thickness of around 2 nm. It was found that polyvinylpyrrolidone and ethylenediamine not only controlled the morphology of the products, but also provided the sources of nitrogen-doped carbon. Benefiting from their unique structural characteristics, hierarchical NC@CoS2 HSs can be applied in lithium-ion batteries, supercapacitors, and photocatalysis. When evaluated as an electrode material, NC@CoS2 with a coating of optimal thickness showed a high lithium-storage capability with a good cycling stability. Moreover, NC@CoS2 had a remarkable supercapacitive performance and photocatalytic activity. The attractive electrochemical and photocatalytic performances were attributed to the overall structural features of the NC@CoS2 hollow spheres: the N-doped-carbon (NC) coating, hollow interior, and ultrathin nanosheets.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore). sjpeng@ntu.edu.sg.
authors.forename: Shengjie
authors.initials: S
authors.lastname: Peng
authors.forename: Linlin
authors.initials: L
authors.lastname: Li
authors.forename: Subodh G
authors.initials: SG
authors.lastname: Mhaisalkar
authors.forename: Madhavi
authors.initials: M
authors.lastname: Srinivasan
authors.forename: Seeram
authors.initials: S
authors.lastname: Ramakrishna
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Yan
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry; D011211:Electric Power Supplies; D008751:Methylene Blue / Q000737:chemistry; D054118:Nanospheres / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D055668:Photochemical Processes
chemical_list: D004396:Coloring Agents; D003035:Cobalt; D002244:Carbon; C027875:cobaltous sulfide; D009584:Nitrogen; D008751:Methylene Blue
keywords: batteries; hollow spheres; lithium; nanostructures; sulfides