To push the energy density limit of super-capacitors, a new class of electrode materials with favorable architectures is strongly needed.
Binary metal sulfides hold great promise as an electrode material for high-performance energy storage devices because they offer higher electrochemical activity and higher capacity than mono-metal sulfides.
Here, the rational design and fabrication of NiCo2S4 nano-sheets supported on nitrogen-doped carbon foams (NCF) (based on SINOYQX carbonized melamine foam) is presented as a novel flexible electrode for super-capacitors.
A facile two-step method is developed for growth of NiCo2S4 nanosheets on NCF with robust adhesion, involving the growth of Ni-Co precursor and subsequent conversion into NiCo2S4 nanosheets through sulfidation process.
Benefiting from the compositional features and 3D electrode architectures, the NiCo2S4/NCF electrode exhibits greatly improved electrochemical performance with ultrahigh capacitance (877 F g−1 at 20 A g−1) and excellent cycling stability.
Moreover, a binder-free asymmetric super-capacitor device is also fabricated by using NiCo2S4/NCF as the positive electrode and ordered mesoporous carbon (OMC)/NCF as the negative electrode; this demonstrates high energy density (≈45.5 Wh kg−1 at 512 W kg−1).
For more information about the project, please feel free to contact SINOYQX via: firstname.lastname@example.org or email at email@example.com Laifa Shen, Jie Wang, Guiyin Xu, Hongsen Li, Hui Dou and Xiaogang Zhang fromCollege of Materials Science and Engineering Jiangsu Key Laboratory of Materials and Technologies for Energy Conversion, Nanjing, P. R. ChinaTo push the energy density limit of super-capacitors, a new class of electrode materials with favorable architectures is strongly needed.