3D reticulate CoxNi3-xS2 nanostructure on nickel foam as a new type of electroactive material for high-performance supercapacitors

作者：Zhang, Enping; Ni, Yonghong^*

来源：RSC Advances, 2016, 6(108): 106465-106472.

DOI：10.1039/c6ra20502j

• NICO2S4 NANOTUBE ARRAYS
• ONE-STEP SYNTHESIS
• IN-SITU GROWTH
• COBALT SULFIDE
• NI FOAM
• NI3S2 NANOPARTICLES
• COMPOSITES
• ELECTRODES
• CAPACITY
• STORAGE

3D reticulate CoxNi(3-x)S(2) nanostructures were grown on nickel foam using a simple precursor sulfuration route. Compared with monometallic Ni3S2, the introduction of an appropriate content of Co could markedly improve electrochemical properties. Also, the electrochemical performance of as-prepared CoxNi3-xS2 nanostructures could be tuned by the Co content added to the Ni3S2. The investigation showed that 3D CoxNi3-xS2 nanostructures prepared from the system with initial Co2+/Ni2+ molar ratio of 2/1 (labeled as S2/1) exhibited the best energy storage properties. At a current density of 2 mA cm(-2), the areal capacitance of S2/1 reached 3030 mF cm(-2); and even at a current density of 30 mA cm(-2), the areal capacitance reached 2268 mF cm(-1). After 6500 cycles at a current density of 5 mA cm(-2), the capacitance retention retained 92.8% of the initial value, exhibiting excellent cycling stability. After 3D reticulate S2/1 nanostructures were fabricated into an asymmetrical supercapacitor with activated carbon, the energy density achieved 73.5 W h kg(-1) at a power density of 600 W kg(-1); and at high power density of 3024.06 W kg(-1), the energy density could still reach 50.04 W h kg(-1), which presents potential applications for energy storage as a high performance electrode material.

• 出版日期2016
• 单位安徽师范大学