MS 2 ( M = Co and Ni) Hollow Spheres with Tunable Interiors for High- Performance Supercapacitors and Photovoltaics

作者：Peng, Shengjie^*; Li, Linlin; Tan, Huiteng; Cai, Ren; Shi, Wenhui; Li, Chengchao; Mhaisalkar, Subodh G.; Srinivasan, Madhavi; Ramakrishna, Seeram; Yan, Qingyu

来源：Advanced Functional Materials, 2014, 24(15): 2155-2162.

DOI：10.1002/adfm.201303273

• metal sulfides
• hollow spheres
• microspheres
• supercapacitors
• dye-sensitized solar cells

We demonstrate in this paper facile synthesis of CoS2 and NiS2 hollow spheres with various interiors through a solution-based route. The obtained CoS2 microspheres constructed by nanosheets display a three-dimensional architecture with solid, yolk-shell, double-shell, and hollow interiors respectively, with continuous changes in specific surface areas and pore-size distributions. Especially, the CoS2 hollow spheres demonstrate excellent supercapacitive performance including high specific capacitance, good charge/discharge stability and long-term cycling life, owing to the greatly improved faradaic redox reaction and mass transfer. Furthermore, CoS2 hollow spheres exhibit superior electrocatalytic activity for disulfide/thiolate (T-2/T-) redox electrolyte in dye-sensitized solar cells (DSCs). Therefore, this work provides a promising approach for the design and synthesis of structure tunable materials with largely enhanced supercapacitor behavior, which can be potentially applied in energy storage devices.

• 出版日期2014-4