Simple synthesis of hierarchically structured partially graphitized carbon by emulsion/block-copolymer co-template method for high power supercapacitors
- Simple synthesis of hierarchically structured partially graphitized carbon by emulsion/block-copolymer co-template method for high power supercapacitors
- Yeongdong Mun; Changshin Jo; Taeghwan Hyeon; Jaehyuk Lee; Kyoung-Su Ha; Ki-Won Jun; 이상협; 홍석원; Hyung Ik Lee; Songhun Yoon; Jinwoo Lee
- Issue Date
- VOL 64, 391-402
- Hierarchical structure with macropores interconnecting mesopores of carbon material can
remarkably improve the rate performance of electric double layer capacitor. However, preformed hard templates such as silica particles or polymer beads have been used in most
synthetic procedures for them, resulting in an increase of manufacturing cost and time.
Herein, we report novel method for synthesizing hierarchically structured macro/mesoporous
partially graphitized carbon (MMPGC) for high power supercapacitor electrode material
without pre-formed hard template. Instead of hard template, emulsion/block co-polymer
co-template was used for generating macropores and mesopores, respectively. As a supercapacitor electrode material, MMPGC showed higher capacity retention at high current
than ordered mesoporous carbon, which is characterized by cyclic voltammetry, galvanostatic
charge–discharge. In addition, the effect of macropores and partially graphitized wall
on reducing resistance of supercapacitor electrode was analyzed in detail with electrochemical
impedance spectroscopy fitting method.
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