Exploring the progression of energy storage toward flexibility: Metal-organic framework and conducting polymer aspects

Emerging as cutting-edge technology, flexible supercapacitors (Sc) own great potential toward advancement in state of the art in elastic and wearable electronics. The Sc leads the way as a potential candidate as compared to rechargeable batteries (Low power density, flexibility deficient, igneous as well as toxic nature) because of high power and tunable energy densities, affordability, outstanding cyclic performance, and adaptability. Metal organic frameworks (MOFs) and conducting polymers (CNDPs) are the most fascinating and extensively used electrode materials in flexible assemblies. The structural adaptability, sustainable surface area, three-dimensional porous architecture, and dominant permeability toward additives attribute the MOFs as innovative candidates for flexible electrodes. Likewise, CNDPs contains outstanding specific redox active capacity and inherent elastic polymeric nature, working as supreme pseudo capacitive constituents for the basis of flexible energy storage devices. Although, both materials have various advantages yet certain challenges like the low conductive nature of pristine MOFs and the substandard flexible performance of CNDPs still needs consideration. In addition, a better understanding must be developed to clarify the impacts of recent development and insights that might be used to direct future prospects. This review depicts the current progression toward the structuration of flexible supercapacitors based on MOFs, CNDPs, and their composites. The highlights of current advancement and residual challenges have been presented along with the comparison of hybridization strategies, and analysis of results obtained with directions toward future prospects of flexible supercapacitor.