دانلود مقاله : Correlation between the capacitor performance and pore structure of ordered mesopor

چکیده : 

Mesoporous carbons were synthesized by organic–organic self-assembly of triblock copolymer F127 and

phenolic resin oligomers composed of resorcinol–formaldehyde or resorcinol–furfural. The mesostructure

control was performed by using different polymerization catalysts, ammonia and acetic acid. The

effects of the aldehyde and polymerization catalyst on pore architecture of mesoporous carbons were

investigated. Disordered mesostructure with poorly disconnected mesopores was formed using furfural.

In contrast, when formaldehyde was used, ordered structure with mesochannels was formed. In addition,

changes in mesochannel length and the degree of long-range order are found to depend on polymerization

catalyst. The porous carbons with different structure were used as a model material to investigate

the ion storage/transfer behavior in electrical double-layer capacitor. Electrochemical cyclic voltammetry

measurements were conducted in 1 Msulfuric acid electrolyte solution. The ordered mesoporous carbons

show superior capacitances and rate performance over the disordered carbons. Electrochemical impedance

spectroscopy was used to assess the transport properties. The impedance data clearly demonstrated

that the degree of long-range order and channel length can influence the ion transport, resulting in superior

capacitive performances.