@Article{CiCP-20-441,
author = {Manman Ma, Shuangliang Zhao and Zhenli Xu},
title = {Investigation of Dielectric Decrement and Correlation Effects on Electric Double-Layer Capacitance by Self-Consistent Field Model},
journal = {Communications in Computational Physics},
year = {2018},
volume = {20},
number = {2},
pages = {441--458},
abstract = {<p style="text-align: justify;">The differential capacitance of electric double-layer capacitors is studied
by developing a generalized model of the self-consistent Gaussian field theory. This
model includes many-body effects of particles near the interface such as ionic sizes, the
order of water alignment and electrostatic correlations, and thus can present more accurate
predictions of the electric double-layer structure and hence the capacitance than
traditional continuum theories. Analytical simplification of the model and efficient
numerical method are introduced, in particular, the approximation of the self-Green&#39;s
function which describes the self energy of a mobile ion. We show that, when the applied
voltage on interfaces is small the dielectric effect of the electrode materials plays
an important role. For large voltage, this effect is screened, but the dielectric saturation
due to the alignment of the nearby water is shown to be essential. For 2:1 electrolytes,
abnormal enhancement on the capacitance due to the dielectric electrode is observed,
which is due to the interplay of the image charge effect and Born solvation energy in
the self energy of ions.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.260715.210316a},
url = {http://global-sci.org/intro/article_detail/cicp/11159.html}
}