van der Heyden Frank H J, Bonthuis Douwe Jan, Stein Derek, Meyer Christine, Dekker Cees
Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
Nano Lett. 2006 Oct;6(10):2232-7. doi: 10.1021/nl061524l.
We theoretically evaluate the prospect of using electrokinetic phenomena to convert hydrostatic energy to electrical power. An expression is derived for the energy conversion efficiency of a two-terminal fluidic device in terms of its linear electrokinetic response properties. For a slitlike nanochannel of constant surface charge density, we predict that the maximum energy conversion efficiency occurs at low salt concentrations. An analytic expression for the regime of strong double-layer overlap reveals that the efficiency depends only on the ratio of the channel height to the Gouy-Chapman length, and the product of the viscosity and the counterion mobility. We estimate that an electrokinetic energy conversion device could achieve a maximum efficiency of 12% for simple monovalent ions in aqueous solution.
我们从理论上评估了利用电动现象将流体静压能转化为电能的前景。根据其线性电动响应特性，推导出了两终端流体装置能量转换效率的表达式。对于表面电荷密度恒定的狭缝状纳米通道，我们预测在低盐浓度下会出现最大能量转换效率。强双层重叠区域的解析表达式表明，效率仅取决于通道高度与古依 - 查普曼长度的比值，以及粘度与反离子迁移率的乘积。我们估计，对于水溶液中的简单单价离子，电动能量转换装置可实现的最大效率为12%。
