Metal-Organic Framework Supercapacitors: Challenges and Opportunities

31 August 2023, Version 2
This content is a preprint and has not undergone peer review at the time of posting.


Supercapacitors offer superior energy storage capabilities than traditional capacitors, making them useful for applications such as electric vehicles and rapid large-scale energy storage. The energy storage performance of these devices relies on electrical double-layer capacitance and/or pseudo-capacitance from rapid reversible redox reactions. Metal-organic frameworks (MOFs) have recently emerged as a new class of electrode materials with promising supercapacitor performances and capacitances that exceed those of traditional materials. However, our comparison of the supercapacitor performance of a porous carbon and a state-of-the-art MOF highlights a number of challenges for MOF supercapacitors, including low potential windows, limited cycle lifetimes, and poor rate performances. We propose that the well-defined and tuneable chemical structures of MOFs present a number of avenues for improving supercapacitor performance. We also discuss recent experimental and theoretical work on charging mechanisms in MOF-based supercapacitors, and find a need for more studies that elucidate the charge storage and degradation mechanisms. Ultimately, a deeper understanding will lead to design principles for realising improved supercapacitor energy storage devices.


Metal-Organic Framework
Electric doublelayer
Materials Design


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