Rubinstein Isaak, Zaltzman Boris
Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion, 84990, Israel.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Aug;80(2 Pt 1):021505. doi: 10.1103/PhysRevE.80.021505. Epub 2009 Aug 21.
We assess the possibility of probing the diffuse electric double layer at a permeable charge-selective interface, such as a nonblocking electrode or ion-exchange membrane, under a finite steady-state current-voltage bias by small harmonic high-frequency current-voltage disturbances. Our main conclusion is that for a finite underlimiting bias, the electric double layer at such an interface is not amenable to this kind of probe; the high-frequency response of the system is dominated by the quasielectroneutral bulk. This is similar to the previously studied zero-bias case. On the other hand, the extended space charge in such double layers may be probed in this way both by the linear and nonlinear responses, correspondingly by the method of electric impedance spectroscopy and via the previously described anomalous rectification effect. The latter appears preferable over the former as a potential experimental tool for the study of the extended space charge of a nonequilibrium electric double layer.
我们评估了在有限的稳态电流 - 电压偏置下，通过小幅度谐波高频电流 - 电压扰动来探测可渗透电荷选择性界面（如非阻塞电极或离子交换膜）处扩散双电层的可能性。我们的主要结论是，对于有限的欠极限偏置，此类界面处的双电层不适用于这种探测方法；系统的高频响应由准电中性本体主导。这与之前研究的零偏置情况类似。另一方面，这种双电层中的扩展空间电荷可以通过线性和非线性响应以这种方式进行探测，相应地通过电阻抗谱方法以及通过先前描述的反常整流效应来探测。作为研究非平衡双电层扩展空间电荷的潜在实验工具，后者似乎比前者更具优势。
