Curvature effects on electric-double-layer capacitance

• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Special Issue on Frontiers of Chemical Engineering Thermodynamics
• 页码范围: 145-152
• 页数: 8页
• 语种: 英文

摘要

Understanding the microscopic structure and thermodynamic properties of electrode/electrolyte inter-faces is central to the rational design of electric-double-layer capacitors (EDLCs). Whereas practical appli-cations often entail electrodes with complicated pore structures, theoretical studies are mostly restricted to EDLCs of simple geometry such as planar or slit pores ignoring the curvature effects of the electrode surface. Significant gaps exist regarding the EDLC performance and the interfacial structure. Herein the classical density functional theory (CDFT) is used to study the capacitance and interfacial behavior of spherical electric double layers within a coarse-grained model. The capacitive performance is associated with electrode curvature, surface potential, and electrolyte concentration and can be correlated with a regression-tree (RT) model. The combination of CDFT with machine-learning methods provides a promis-ing quantitative framework useful for the computational screening of porous electrodes and novel electrolytes.