电解质
表面电荷
电荷密度
化学
电极
电化学
双层(生物学)
吸附
分析化学(期刊)
电荷(物理)
离子
二价
图层(电子)
物理化学
色谱法
物理
有机化学
量子力学
作者
Jian Wang,Allen J. Bard
摘要
The surface charge at the interface of a Au electrode with a KClO4 solution was measured by in situ atomic force microscopy (AFM) using a modified cantilever with a charged SiO2 sphere. The effective charge determined by treating the AFM force curve was much smaller than that injected electrochemically, with the ratio of the effective/real surface charge to the electrochemical charge being below 10%. This large difference suggests that classical Gouy−Chapman−Stern (GCS) theory is inadequate to describe the diffuse electrical double layer. Ion correlation and ion condensation effects might account for the reduced surface charge. Additional experiments on the effect of electrolytes containing divalent species [Ca(NO3)2 and Na2SO4] and the effect of adsorption of sodium dodecyl sulfate on the Au electrode provide additional evidence for such effects.
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