Ultrathin Ni_1−xCo_xS₂ nanoflakes as high energy density electrode materials for asymmetric supercapacitors

• Xiaoxiang Wang,
• Teng Wang,
• Rusen Zhou,
• Lijuan Fan,
• Shengli Zhang,
• Feng Yu,
• Tuquabo Tesfamichael,
• Liwei Su and
• Hongxia Wang

Beilstein J. Nanotechnol. 2019, 10, 2207–2216, doi:10.3762/bjnano.10.213

• from both nickel and cobalt ions in the bimetallic sulfides can provide relatively affluent redox reactions, resulting in higher specific capacitance and electrical conductivity [6][7]. Moreover, layered ultrathin nanoflakes in the synthesised nanomaterials, derived from metal oxides/dichalcogenides

• [43]. These results reconfirm the superior performance of the Ni1−xCoxS2/NF//AC/NF ASC and demonstrate a great potential in high power supercapacitors. Conclusion We have demonstrated a facile strategy for the fabrication of Ni1−xCoxS2 ultrathin nanoflakes with the thickness of about 10 nm. This

• energy density of 67.5 Wh·kg−1), and excellent cycling stability and capacity retention. These results can be credited to synergic effects rich and fast redox reactions, high conductivity, as well as highly porous and robust ultrathin nanoflakes structures. (a) X-ray diffraction patterns of Ni1−xCoxS2