The enhanced adhesion between overlong TiNxOy/MnO2 nanoarrays and Ti substrate: Towards flexible supercapacitors with high energy density and long service life

Flexible symmetric supercapacitor constructed by TiNxOy/MnO2 nanoarrays, of which the adhesion between TiNxOy and Ti substrate is enhanced by introducing a compact layer (~ 140 nm in thickness), can offer a high capacitance of 21.94 mF cm−2 even at a fast charge-discharge rate of 60 mA cm−2, and deliver ultralong cyclic stability with a retention of 93.88% over 10,000 cycles.264