Formulation and optimization of Ni-MOF/CuSe nanocomposite ink for high-performance flexible microsupercapacitor
Mohammad Saquib, M. Selvakumar, Ramakrishna Nayak, Abhishek Prakash, Y.N. Sudhakar, S. Senthilkumar, D. Krishna Bhat
Abstract
The growth of flexible and wearable electronics drives progress in printed, flexible micro-supercapacitors for energy storage. This study fabricates flexible and foldable micro-supercapacitors using a nanocomposite of Ni-based Metal-Organic Framework (Ni-MOF) and copper selenide (CuSe). The conductive ink, blending Ni-MOF and CuSe, ensures thorough mixing for screen-printing. The resulting devices exhibit impressive electrochemical performance, with the NC-5 FAS device showing high areal capacitance, promising energy density and (3.65 mWhcm −2 and power density (73.8 mWcm −2 ). Integration into a 3D enclosure configuration enhances performance, with improved capacitance, energy density (47.08 mWhcm −2 ) and power density and outstanding power density (985.8 mWcm −2 ), maintaining capacitance retention of the 93.9 % and with highly robust mechanical durability during flexibility tests. This study highlights tailored nanocomposite's potential to revolutionize flexible and foldable energy storage, advancing high-performance, portable electronics. • Printed NC-5 FAS exhibits superior performance with 47.08 mWh cm −2 energy density and 985.8 mW cm −2 power density. • The formulated Ni-MOF/CuSe ink, with 5306 mPa·s viscosity, enables efficient fabrication of flexible supercapacitors. • The 3D FlexiPower Bank enhances the microsupercapacitor discharge time and energy storage by fourfold. • The versatile microsupercapacitors maintain 93.9% capacitance retention and strong durability at various bending angles.