Controlling Mesopore Orientation in Carbon Spheres to Enhance Internal Accessibility for High-Rate Potassium-Ion Storage
발표자
박종윤 (아주대학교)
연구책임자
황종국 (아주대학교)
공동저자
박종윤 (아주대학교), 황종국 (아주대학교)
초록
내용
The internal accessibility of active sites is crucial for high-power potassium-ion hybrid supercapacitors (PIHCs). Here, mesopore-orientation-controlled carbon spheres were synthesized via a multiscale phase separation strategy integrating block copolymer microphase separation with homopolymer macrophase separation. This method produced two mesoporous carbons with controlled mesopore orientations: open-end (oe-MCS) and closed-end mesoporous carbon spheres (ce-MCS). By selectively regulating mesopore openings without changing other structural parameters, we show that open mesopores enhance K⁺ adsorption, shorten diffusion pathways, and improve ion transport. Consequently, the oe-MCS exhibits higher capacity and dominant capacitive behavior. The resulting PIHC delivers 103 Wh kg⁻¹, 12,300 W kg⁻¹, and 86.1% capacity retention over 20,000 cycles. This work highlights mesopore orientation as a key design factor for high-power potassium-ion storage.