Charge-Transfer-Modulated Transparent Supercapacitor Using Multidentate Molecular Linker and Conductive Transparent...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• High-performance transparent supercapacitors (TSCs) face challenges balancing areal capacitance, optical transmittance, and rate capability.
• Existing methods struggle to overcome the trade-offs between energy density, transparency, and charging speed.

Purpose of the Study:

• To develop a transparent supercapacitor (TSC) with enhanced areal capacitance, fast rate capability, and high optical transparency.
• To minimize charge transfer resistance in pseudocapacitive nanoparticle electrodes using molecular linkers and conductive nanoparticles.

Main Methods:

• Layer-by-layer (LbL) assembly of manganese oxide (MnO) and indium tin oxide (ITO) nanoparticle multilayers.
• Ligand exchange reactions using small multidentate linkers (tricarballylic acid) to reduce nanoparticle separation.
• Periodic insertion of ITO nanoparticles into MnO nanoparticle electrodes to lower charge transfer resistance.

Main Results:

• Molecular linkers significantly reduced inter-particle separation and contact resistance.
• ITO nanoparticle incorporation lowered charge transfer resistance, enhancing areal capacitance from 24.6 to 40.5 mF cm⁻² at comparable transmittance (61.6% vs 60.8%).
• Demonstrated a flexible, symmetric, solid-state TSC with scalable performance.

Conclusions:

• The developed LbL assembly method effectively overcomes the performance trade-offs in transparent supercapacitors.
• This approach offers a promising pathway for high-performance, transparent energy storage devices.