Porous NiCo2O4 Nanowire Arrays as Supercapacitor Electrode Materials with Extremely High Cycling Stability

In this work,NiCo2O4(NCO)was svnthesized via microwave hvdrothermal method and a further annealing treatment.Research results have shown that the surface defects(Co^2+ site)and pore size of the materials can beadjusted by simply changing the calcination temperatures,and porous nanowire arrays structure can be obtained.Theporous structure is conducive to the penetration of the electrolvte and enables the NCO to fully participate in the clectrochemical reaction.What's more,the NCO material has ample space to buffer the volume change in the cvcle test,improving the cvcling stability.The NCO obtained at 350℃has better performance.It exhibits a specific capaitance of 648.69 F/g at 1 A/g and good rate capability.Especially,at 10 Ag.the specific capacitance can still be maintained at 80.00%after 10000 galvanostatic charge/discharge(GCD)cycles,showing excellent cycling stability.