( 湖南大學(xué) 材料科學(xué)與工程學(xué)院， 長(zhǎng)沙 410082)
摘 要: 以酚醛樹(shù)脂為原料， KOH為活化劑， 制備出3種不同孔徑分布的微孔型多孔炭(孔徑≤2 nm)。 在低溫氮?dú)馕椒y(cè)定BET比表面積和孔結(jié)構(gòu)的基礎(chǔ)上， 采用循環(huán)伏安法考察了這3種微孔型多孔炭作電極的雙電層電容器(EDLC)的電容特性。 實(shí)驗(yàn)結(jié)果表明， 微孔型多孔炭作電極的EDLC的電容特性是： 在低掃描速率下， 其循環(huán)伏安曲線達(dá)到電容平臺(tái)后在高電壓(±1.0 V)附近出現(xiàn)峰電容； 延長(zhǎng)在電解液中的浸漬時(shí)間， 電極的比電容增大， 高電位附近的峰電容減小。 3種不同孔徑分布的微孔型多孔炭作電極的EDLC的循環(huán)伏安特性受浸漬時(shí)間影響的程度也不同。
關(guān)鍵字: 多孔炭； 雙電層電容器； 循環(huán)伏安法； 微孔； 電容特性
micropores studied by cyclic voltammetry
（ College of Materials Science and Engineering,
Hunan University, Changsha 410082, China）
Abstract: Three porous carbons with different micropore distribution, prepared from phenolic resins activation by various mass fraction of KOH, were applied in electric double-layer capacitor (EDLC). The BET specific surface areas and pore structure parameters of three porous carbons obtained were determined by the nitrogen gas adsorption isotherm. And the capacitance charicteristics of EDLC used three porous carbons were studied by cyclic voltammetry(CV). The results show that the cyclic voltammogram of the EDLC used porous carbons with micropore appears capacitance peak near high voltage (±1.0 V) after arriving capacitance flat at small scan rate, which is different from the cyclic voltammograms of porous electrode with macropore and mesopore. Moreover the specific capacitance of porous carbons with micropore mainly increases while the capacitance peak near high voltage decreases when the soakage time of porous carbon electrode in KOH electrolyte is prolonged. The influences of soakage time on cyclic voltammogram of EDLC with three porous carbons obtained are different due to the different micropore distribution.
Key words: porous carbon; electric double-layer capacitor; cyclic voltammetry; micropore; capacitance characteristic
