Regular Mesoporous Superparticles with a Tailored Opening Window and Tunable Surface Crisscrossed Grooves

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Aqueous zinc ion hybrid capacitors require high-loading electrode materials for enhanced performance.
• Synthesizing complex nanostructures like hollow mesoporous superparticles with controlled surface features presents significant challenges.

Purpose of the Study:

• To develop a facile synthesis strategy for regular hollow mesoporous superparticles with controllable surface grooves.
• To investigate the performance of these superparticles as electrodes in aqueous zinc ion hybrid capacitors.

Main Methods:

• An electrostatic force-assisted monomicelle confined assembly strategy was employed.
• The synthesis allowed precise control over superparticle size, window dimensions, and groove characteristics (width, depth, number).

Main Results:

• Successfully synthesized hollow mesoporous superparticles (∼250 nm hollow, 35-50 nm window, ∼15 nm mesopores).
• Demonstrated tunable surface grooves (29.5-62.4 nm width, 2.1-40.7 nm depth, 11x11 to 5x5 groove arrangements).
• Electrodes exhibited high specific capacity (205 mAh g⁻¹ at 0.1 A g⁻¹) and excellent rate capability (105 mAh g⁻¹ at 10 A g⁻¹).

Conclusions:

• The electrostatic assembly method enables the controlled synthesis of advanced mesoporous superstructures.
• Tunable surface grooves allow orthogonal control over charge transfer and ion diffusion rates.
• These superparticles show significant potential for high-performance energy storage applications.