Journal
ADVANCED MATERIALS
Volume 34, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202104206
Keywords
conjugated polyelectrolytes; electrochemical energy storage; mixed ionic-electronic conductor; pseudocapacitors
Categories
Funding
- National Science Foundation Graduate Research Fellowship Program [1650114]
- President's Graduate Fellowship (PGF) under the National University of Singapore
- [R-143-000-A97-133]
- [KY2260000001]
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Conjugated polyelectrolytes (CPEs), characterized by electronically delocalized backbones with ionic functionalities, are suitable for energy-storing pseudocapacitor devices. This perspective discusses the basis for evaluating pseudocapacitor figures of merit, the general utility and challenges of neutral conjugated polymers, and recent advances in the use of CPEs in pseudocapacitor devices.
Conjugated polyelectrolytes (CPEs) are characterized by an electronically delocalized backbone bearing ionic functionalities. These features lead to properties relevant for use in energy-storing pseudocapacitor devices, including ionic conductivity, water processability, gel-formation, and formation of polaronic species stabilized by electrostatic interactions. In this Perspective, the basis for evaluating the figures of merit for pseudocapacitors is provided, together with the techniques used for their evaluation. The general utility and challenges encountered with neutral conjugated polymers are then discussed. Finally, recent advances on the use of CPEs in pseudocapacitor devices are reviewed. The article is concluded by discussing how their miscibility in aqueous media permits the incorporation of CPEs in living materials that are capable of switching function from extraction of energy from bacterial metabolic pathways to pseudocapacitor energy storage.
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