TY - JOUR
T1 - Tuning Internal Accessibility via Nanochannel Orientation of Mesoporous Carbon Spheres for High-Rate Potassium-Ion Storage in Hybrid Supercapacitors
AU - Park, Jongyoon
AU - Kim, Kangseok
AU - Lim, Eunho
AU - Hwang, Jongkook
N1 - Publisher Copyright:
© 2024 Wiley-VCH GmbH.
PY - 2024
Y1 - 2024
N2 - Enhancing the accessibility and utilization of active sites through mesopores in carbon anode materials is crucial for developing high-power potassium-ion hybrid supercapacitors (PIHCs). Here, a multiscale phase separation method combining block copolymer (BCP) microphase- and homopolymer (HP) macrophase-separation is utilized to produce two model carbon materials with controlled mesopore orientation: open-end (oe-MCS) and closed-end mesoporous carbon sphere (ce-MCS). BCPs form identical cylindrical micelles, and HPs encapsulate these cylindrical micelles within spheres and control their orientations relative to the interface. This approach manipulates only the degree of mesopore openings in the MCS materials while maintaining all other factors at similar levels. Opening mesopores in carbon anode materials primarily enhances K+ adsorption capacity, reduces K+ diffusion length, and improves ion transport. Thus, oe-MCS anode exhibits a higher specific capacity with a significant capacitive-controlled contribution. The resulting PIHC device displays maximum energy and power densities of 103 Wh kg−1 and 12 300 W kg−1, respectively, along with capacity retention of 86.1% after 20 000 cycles at 2.0 A g−1. This study significantly advances the understanding of mesopore design to improve capacitive K+ storage in hard carbon materials, paving the way for the development of high-power PIHCs.
AB - Enhancing the accessibility and utilization of active sites through mesopores in carbon anode materials is crucial for developing high-power potassium-ion hybrid supercapacitors (PIHCs). Here, a multiscale phase separation method combining block copolymer (BCP) microphase- and homopolymer (HP) macrophase-separation is utilized to produce two model carbon materials with controlled mesopore orientation: open-end (oe-MCS) and closed-end mesoporous carbon sphere (ce-MCS). BCPs form identical cylindrical micelles, and HPs encapsulate these cylindrical micelles within spheres and control their orientations relative to the interface. This approach manipulates only the degree of mesopore openings in the MCS materials while maintaining all other factors at similar levels. Opening mesopores in carbon anode materials primarily enhances K+ adsorption capacity, reduces K+ diffusion length, and improves ion transport. Thus, oe-MCS anode exhibits a higher specific capacity with a significant capacitive-controlled contribution. The resulting PIHC device displays maximum energy and power densities of 103 Wh kg−1 and 12 300 W kg−1, respectively, along with capacity retention of 86.1% after 20 000 cycles at 2.0 A g−1. This study significantly advances the understanding of mesopore design to improve capacitive K+ storage in hard carbon materials, paving the way for the development of high-power PIHCs.
KW - high power density
KW - mesopore orientation
KW - mesoporous carbon sphere
KW - multiscale phase separation
KW - potassium-ion hybrid supercapacitor
UR - http://www.scopus.com/inward/record.url?scp=85201158130&partnerID=8YFLogxK
U2 - 10.1002/adfm.202410010
DO - 10.1002/adfm.202410010
M3 - Article
AN - SCOPUS:85201158130
SN - 1616-301X
JO - Advanced Functional Materials
JF - Advanced Functional Materials
ER -