MnO2 characterized by high energy density,low cost,and natural abundance,has presented itself as one of the most promising candidates for supercapacitors application.In this study,A well-designed coaxial array MnO2/TiN NTA electrode has been successfully prepared through electrodepositing mesoporous MnO2 into the TiN NTA.The combination of mesoporous MnO2 and TiN into coaxial nanowires arrays have showed promising capacitance (681 F g-1 at current density of 2 A g-1),excellent rate capability (267.2 F g-1 at a scan rate of 2000 mV s-1,390.2 F g-1 at current density of 400 A g-1),and long cycle life for supercapacitor applications (97％ retention after 1000 cycles).These results demonstrate that this coaxial composite nanostructure is very promising for high performance supercapacitors.