Simple method for the preparation of highly porous ZnCo_2O_4 nanotubes with enhanced electrochemical property for supercapacitor

摘要

One-dimensional (1D) ZnCo_2O_4 porous nanotubes (PNTs) have been synthesized using a simple technique of electrospinning followed by calcination in air and firstly applied in supercapacitors (SCs). The obtained ZnCo_2O_4 nanomaterial displays 1D architecture with a highly porous nature and hollow interiors. This unique structure significantly enlarged the electroactive surface areas of the ZnCo_2O_4, leading to better electrolyte/electrode contact, more efficient transport pathways and good strain accommodation. Our experimental results demonstrate that it exhibits a high specific capacitance of 770 F g~(-1) at 10 A g~(-1), excellent rate property (84% of the capacity retention at 60 A g~(-1)) and good cycling stability of only 10.5% loss after 3000 cycles. Compared with the ZnCo_2O_4 nanoparticals, such obtained PNTs possess enhanced rate and capacitive properties. Our work confirms the as-prepared ZnCo_2O_4 PNTs can serve as advanced SCs materials. It is highly expected this simple method of electrospinning can be extended to prepare other superior electrochemical materials.