Flexible Supercapacitor Technologies Using Cellulose-Based Materials

Flexible supercapacitors incorporating cellulose-based materials have emerged as a promising class of green and sustainable energy storage devices that combine high power density, rapid charge–discharge rates, long cycling life and mechanical pliability. Cellulose, being the most abundant natural polymer, serves as an ideal substrate or precursor for the fabrication of electrodes, separators and current collectors. At the nanoscale, cellulose nanofibrils or nanocrystals offer a highly porous network and ample surface area, which facilitate ion transport and charge storage when functionalised with conductive components such as carbon nanomaterials, conducting polymers or metal oxides. Common fabrication strategies include vacuum filtration to form freestanding papers and membranes, freeze‐drying to create aerogels, in situ polymerisation of conducting polymers on cellulose scaffolds, and pyrolysis to convert cellulose into hierarchically porous carbon. These architectures deliver areal capacitances in the range of hundreds to thousands of millifarads per square centimetre, maintain stability over thousands of cycles and preserve performance under bending or twisting. The inherent flexibility, light weight and biodegradability of cellulose-based composites render them well suited to wearable electronics, portable sensors and foldable displays, while their renewable origin addresses environmental and cost concerns. Ongoing efforts focus on optimising pore architecture, enhancing electrical conductivity through composite design, improving electrolyte compatibility and scaling up fabrication methods to bridge laboratory-scale advances with real-world deployment.

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Flexible Supercapacitor Technologies Using Cellulose-Based Materials publication trend

The graph below shows the total number of articles in flexible supercapacitor technologies using cellulose-based materials across all publications each year (not limited to Nature Index journals).

Technical terms

Supercapacitor: An electrochemical energy storage device characterised by high power density, rapid charge–discharge capability and long cycle life, storing charge via electrical double‐layer or pseudocapacitive mechanisms.

Cellulose nanofibrils (CNFs): Nano-scale fibres derived from cellulose with diameters below 100 nm, offering high aspect ratio, tunable surface chemistry and network-forming ability for composite structuring.

Areal capacitance: The capacitance measured per unit area of electrode material (mF cm⁻²), reflecting the charge storage capacity available on a two-dimensional interface.

Electrochemical performance: A collective term for metrics such as specific or areal capacitance, energy density, power density and cycle stability that quantify the efficacy of an electrochemical device.

References

1. Recent Research Progress of Paper‐Based Supercapacitors Based on Cellulose. Energy & Environmental Materials (2023).
2. Biomass‐based materials for advanced supercapacitor: principles, progress, and perspectives. Aggregate (2023).
3. Review on nanocellulose-based materials for supercapacitors applications. Journal of Energy Storage (2022).