Complex Materials with Stochastic Structural Patterns: Spiky Colloids with Enhanced Charge Storage Capacity

Area of Science:

• Materials Science
• Nanotechnology
• Energy Storage

Background:

• Self-assembled materials with complex architectures are crucial for energy and sustainability technologies.
• Understanding structure-property relationships in these materials is challenging due to inherent disorder and variability.
• FeSe2 "hedgehog" particles (HPs) offer a model system with reproducible, complex nanoscale architecture.

Purpose of the Study:

• To investigate the charge storage mechanisms in complex nanostructured materials using FeSe2 HPs.
• To elucidate the contributions of nanoscale architecture to enhanced energy storage performance.
• To explore the potential of HPs in batteries and supercapacitors.

Main Methods:

• Fabrication and characterization of FeSe2 hedgehog particles (HPs).
• Electrochemical testing to evaluate charge density and storage capacity.
• Analysis of structural features and atomic dynamics contributing to performance.

Main Results:

• FeSe2 HPs exhibit ≈70x greater charge density compared to spheroidal particles.
• Enhanced charge storage is attributed to increased surface area, improved hole transport, and reversible atomic conformations in spikes.
• HPs quadruple stored electrochemical energy and double the storage modulus in structural supercapacitors.

Conclusions:

• FeSe2 HPs demonstrate superior charge storage capabilities due to their unique self-assembled architecture.
• The rotatory motion of Se atoms in HPs' spikes plays a key role in reversible atomic conformations and enhanced performance.
• HPs show significant promise for integration into next-generation energy storage devices.