摘要
以间苯二酚和甲醛为原料，六次甲基四胺为催化交联剂，通过溶胶-凝胶、常压干燥和炭化处理制备炭气凝胶，考察了炭化升温速率对炭气凝胶孔结构和电容特性的影响。采用BET法分析不同升温速率下制得的炭气凝胶的孔结构，并利用直流充放电、交流阻抗技术和循环伏安法测定由炭气凝胶电极与KOH电解质构成的双电层电容器的性能。结果表明：在升温速率为2℃／min时制备的炭气凝胶电极具有良好的电化学性能。在30％的KOH电解质溶液中低电流密度（1mA／cm^2）充放电时的比电容为176F／g，电流密度增大20倍，容量保持率为84．3％，经过1000次循环，容量保持率达93％以上，具有良好的大电流充放电性能和循环性能。
A series of phenol- formaldehyde resin- based carbon aerogel materials were prepared by the polycondensation of resorcinol and formaldehyde catalyzed by HMTA, then drying at ambient pressure and pyrolysis at 900℃ with different heating rates in nitrogen.The effects of carbonization heating rates on the pore structure were researched by nitrogen gas adsorption isotherm.And the electrochemical characteristic of the electrode material with the electrolyte of KOH in EDLC were studied by charging and discharging, cyclic voltammetry（CV） and AC impedence method.The results show that the carbon aerogel electrode material carbonized at a heating rate of 2 ℃/min has a good capacitance performance.The specific capacitance reaches 176 F/g at the low current density Of 1 mA/cm^2 in the electrolyte of 30% KOH and retains 84.3% even as the current density switches to 20 mA/cm^2 and with a capacity- keeping rate over 1 000 cycles of above 93 %, respectively.
出处
《炭素》
2011年第3期8-13,共6页
Carbon
基金
国家自然科学基金（50872032）
关键词
炭气凝胶
炭化
升温速率
孔结构
电化学性能
carbon aerogel
carbonization
heating rate
pore structure
electrochemical characteristic
