Transparent Supercapacitor Technologies and Applications

Transparent supercapacitors constitute a class of energy storage devices distinguished by their simultaneous optical transmittance, high power density and long cycle life. They bridge the gap between rigid conventional supercapacitors and the demands of next-generation electronics, including foldable displays, smart windows, wearable sensors and implantable medical devices. Two principal charge-storage mechanisms coexist in these systems: electrical double-layer capacitance at high-surface-area interfaces and pseudocapacitance arising from reversible faradaic reactions. Achieving a balance between energy density and optical clarity has driven innovations in nanostructured electrodes, doped semiconductor oxides and conducting polymer composites. Core–shell nanowire meshes, dopant-engineered mesoporous films and bioinspired carbon–graphene networks exemplify architectures that maintain >80% transmittance while delivering areal capacitances from millifarads to farads per square centimetre. Integration strategies span inkjet printing, spin-coating and chemical vapour deposition, enabling scalable fabrication. Globally, transparent supercapacitors promise to transform consumer electronics, Internet-of-Things nodes and biocompatible power supplies by embedding seamless, unobtrusive energy reservoirs into functional surfaces.

Research from Nature Portfolio

Recent studies have demonstrated that interstitial boron doping of mesoporous semiconductor oxides generates robust pseudocapacitive sites without compromising optical clarity. By tuning defect concentrations, volumetric capacitances approaching 1,200 F cm⁻³ are achieved alongside >85% transmittance, combined with excellent cycling stability and device flexibility suitable for planar electronics. In parallel, bioinspired three-dimensional networks comprising a spongy carbon core enveloped by a graphene sheath have delivered flexible transparent electrodes with sheet resistances below 2 Ω sq⁻¹ and areal capacitances above 7 mF cm⁻². Symmetric full cells based on these networks maintain ~80% transparency and exhibit no capacitance loss after tens of thousands of bend–release cycles, underscoring their mechanical resilience and potential for wearable displays.

Transparent Supercapacitor Technologies and Applications publication trend

The graph below shows the total number of articles in transparent supercapacitor technologies and applications across all publications each year (not limited to Nature Index journals).

Technical terms

Supercapacitor: An energy storage device that stores charge via electrical double-layer formation and/or reversible faradaic reactions, offering high power density and long cycle life.

Electrical double-layer capacitor (EDLC): A supercapacitor type in which charge is stored non-faradaically at the electrode–electrolyte interface.

Pseudocapacitance: Charge storage resulting from fast, reversible redox reactions at or near the electrode surface, contributing additional capacitance beyond the EDLC component.

Areal capacitance: Capacitance normalized to the electrode surface area, expressed in farads per square centimetre (F cm⁻²).

Volumetric capacitance: Capacitance normalized to the volume of the active material, expressed in farads per cubic centimetre (F cm⁻³).

Transparent electrode: A conductive film or network exhibiting high optical transmittance, used as an electrode in optoelectronic and energy storage devices.

References

1. Ag/Au/Polypyrrole Core-shell Nanowire Network for Transparent, Stretchable and Flexible Supercapacitor in Wearable Energy Devices. Scientific Reports (2017).
2. Interstitial boron-doped mesoporous semiconductor oxides for ultratransparent energy storage. Nature Communications (2021).
3. Bioinspired networks consisting of spongy carbon wrapped by graphene sheath for flexible transparent supercapacitors. Communications Chemistry (2019).
4. Flexible, Transparent and Highly Conductive Polymer Film Electrodes for All-Solid-State Transparent Supercapacitor Applications. Membranes (2021).
5. Electrochemical Studies of Inkjet Printed Semi-Transparent NiCo2O4/ITO Supercapacitor Electrodes. Catalysts (2023).
6. Transparent and Multi‐Foldable Nanocellulose Paper Microsupercapacitors. Advanced Science (2022).
7. Stretchable Transparent Supercapacitors for Wearable and Implantable Medical Devices. Advanced Materials Technologies (2021).