强碱溶液中阳极极化的玻碳电极特性

The surface properties of GCE treated by anodic polarization in strong alkaline solutions are makedly different from that of polished GCE. XPS results show thta more oxygenic groups as carbonyl and acid anhydride are formed on the electrode surface, the ratio of O/C increases, C1s and O1s peaks shift to higher binding energies. Moreover, the adsorptivity of the treated GCE decreases and shows no obvious adsorption for Fe2+ in H2SO4 solution. On the other hand, behaviour of the electrode reaction is also prominently improved. The background current is less, the electron transfer rate is greatly speeded up and the reverse of the electrode reaction for Fe3+/2+, Eu3+/2+ is effectively enhanced for treated GCE.     

分形表面电子态

基于Ｐａｌａｓａｎｔｚａｓ的分形上高度－高度关联函数的近似富里叶变换Ｗ（ｋ）,研究了电子态在分形表面上的局域化,发现电子态与表面粗糙有较强的耦合,而且局域化不仅与粗糙的两个参数－均方根高度σ和关联长度ζ有关,还受表面分维数影响,数值结果显示局域化随分维的增大而加强。