We also analysed the galvanostatic charge-discharge profile of our screen-printed textile supercapacitor, Figure . The almost symmetrical triangular shapes indicated a good capacitive behaviour of linear profile, with a low voltage drop. The slight voltage drop at the beginning of the discharge curve; is known as an IR drop (I = current and R = inner resistance), attributed to the energy consumption of the device's equivalent series resistance (ESR). The ESR of any device is the value of the real impedance Z', where Z'' is close to zero at the highfrequency region. With an overall device area of 1 cm 2 , the ESR of the printed supercapacitor device was ~6.95 Ω at a lower frequency (1 kHz) and decreased to ⁓ 2.63 Ω at a higher frequency range (50 kHz), as indicated by the Nyquist plot, Figure . The quasi-vertical straight line at low frequency in EIS also indicates good capacitive behaviour. The electrochemical stability of the supercapacitor was also investigated based on long-term charge-discharge curves at a current density of 1 mA cm -2 . It showed that the MOF screenprinted supercapacitor maintained ~97.4% of its initial capacitance even after 1,000 cycles, demonstrating excellent stability ( Figure ). The CV profile of the supercapacitor was also consistent throughout the cycles (inset). Figure shows the charge-discharge curves of the 990 th to 1000 th cycle in the GCD tests. The screen-printed MOF supercapacitor exhibited a high areal energy density of ~123.06 µWh cm -2 and a high power density of ~55377.5 µW cm -2 .