Full density NiTi samples with a composition of Ti-50 wt% Ni are fabricated using hot isostatic pressing (HIP), followed by the HPT process at room temperature, with an applied pressure of 6 GPa for 10 turns. The nanostructural analysis reveals that the HIP-processed samples with a B2- NiTi phase evolve into significant grain refinement after HPT process and an interwoven B2- B19′ nanocrystalline/amorphous structure formed, leading to increased hardness in these samples. We demonstrate the efficient synthesis and its capacitive performance was calculated by cyclic voltammetry and charge–discharge cycling in 6M KOH solution. It is found that the NiTi samples with nafion and PTFE solution electrode exhibits superior capacitive performance with high capability at about 500 F g-1 at 2 A g-1, excellent rate capability, and enhanced electrochemical stability with 91.7% retention after 800 continuous charge-discharge cycles even at a high current density of 2 mA cm-2.
