Garlyyev Batyr, Xue Song, Watzele Sebastian, Scieszka Daniel, Bandarenka Aliaksandr S
Physik-Department ECS , Technische Universität München , James-Franck-Str. 1 , D-85748 Garching , Germany.
Nanosystems Initiative Munich (NIM) , Schellingstraße 4 , 80799 Munich , Germany.
J Phys Chem Lett. 2018 Apr 19;9(8):1927-1930. doi: 10.1021/acs.jpclett.8b00610. Epub 2018 Apr 3.
Understanding the properties of the electrical double layer (EDL) is one of the interdisciplinary topics that plays a key role in the investigation of numerous natural and artificial systems. We present experimental evidence about the influence of the nature of the alkali metal cations on the EDL capacitance for two model electrodes, Pt(111) and Au(111), in 0.05 M AMClO ( AM: Li, Na, K, Rb, Cs) electrolytes using impedance spectroscopy measurements. Our data show that counterintuitively the differential EDL capacitance of both electrodes measured close to their potentials of zero charge increased linearly in the presence of alkali metal cations as Li < Na < K < Rb < Cs. We also estimated the effective concentrations of these cations at the EDL, which appeared ∼80 times higher than their bulk concentrations. We believe that these findings should be of importance for theoretical modeling of the EDL and better understanding and faster design of new functional systems for numerous applications.
理解双电层（EDL）的性质是众多跨学科课题之一，在众多自然和人工系统的研究中起着关键作用。我们通过阻抗谱测量，给出了关于碱金属阳离子性质对两种模型电极Pt(111)和Au(111)在0.05 M AMClO（AM：Li、Na、K、Rb、Cs）电解质中EDL电容影响的实验证据。我们的数据表明，与直觉相反的是，在接近其零电荷电位处测量的两种电极的微分EDL电容在碱金属阳离子Li < Na < K < Rb < Cs存在时呈线性增加。我们还估计了这些阳离子在EDL处的有效浓度，其似乎比它们的本体浓度高约80倍。我们认为，这些发现对于EDL的理论建模以及更好地理解和更快地设计用于众多应用的新型功能系统应该具有重要意义。
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