Abstract: Here we report the preparation of nano-actived carbon (nm-AC) electrode materials with different pore size distributions by roller vibration milling at room temperature. The mechanical vibration milling can obtain nm-AC of 30-50nm, and improve the crystalline of prepared nm-AC. Meanwhile we synthesized nano-bismuth oxide doped MnO₂ by sol-gel methods. Based on a variety of measurements, such as XRD, TEM, AFM, BET, electro-chemical analysis, we experienced the microstructure and the electrochemical performance of the nano-composite electrode materials. Through analysis we found that mixing manganese dioxide materials with nm-AC in optimum weight ratio (10%) may increase the specific capacitance of nm-AC effectively. And the mixed MnO₂ / active carbon raw material was modified by vibration milling. We used the composed nano-actived carbon/MnO₂ electrode materials by vibration milling and sol-gel methods in super-capacitors.

Key words:

纳米活性炭, 振动研磨, 氧化铋掺杂纳米二氧化锰, 溶胶-凝胶法

摘要：

首次应用机械振动研磨法在室温条件制备纳米活性炭电极材料，经过30 min研磨后，得到了粒度分布在30～50 nm之间的纳米活性炭（nm-AC），研究表明，这种纳米活性炭的结晶性得到了明显增强和改善，且孔径分布更趋于合理。并用溶胶-凝胶方法合成了掺杂氧化铋的纳米二氧化锰（nm-Bi-MnO ₂），将其与制备的纳米活性炭制成超级电容器所需的复合电极材料。与10%二氧化锰复合的纳米活性炭电极具有最佳的充放电性能，尤其是在掺杂氧化铋的情况下比电容能量达到308 F·g^-1，且随着电流增大没有显著的衰减。与此同时，用机械振动研磨法将二氧化锰与活性炭的混合物进行研磨改性，电化学分析表明，经机械振动研磨改性的二氧化锰的比电容相对较大，具有进一步提高电极材料性能的潜力。

关键词:

纳米活性炭, 振动研磨, 氧化铋掺杂纳米二氧化锰, 溶胶-凝胶法