SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 29 ›› Issue (3): 145-152.DOI: 10.1016/j.cjche.2020.10.039

• Special Issue on Frontiers of Chemical Engineering Thermodynamics • 上一篇    下一篇

Curvature effects on electric-double-layer capacitance

Jie Yang1, Alejandro Gallegos2, Cheng Lian1, Shengwei Deng3, Honglai Liu1, Jianzhong Wu2   

  1. 1 State Key Laboratory of Chemical Engineering, and School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;
    2 Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA;
    3 College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
  • 收稿日期:2020-09-14 修回日期:2020-10-10 出版日期:2021-03-28 发布日期:2021-05-13
  • 通讯作者: Cheng Lian, Shengwei Deng, Jianzhong Wu
  • 基金资助:
    This work was sponsored by the National Natural Science Foundation of China (Nos. 91834301, 21908053, and 21808055), Shanghai Sailing Program (19YF1411700).

Curvature effects on electric-double-layer capacitance

Jie Yang1, Alejandro Gallegos2, Cheng Lian1, Shengwei Deng3, Honglai Liu1, Jianzhong Wu2   

  1. 1 State Key Laboratory of Chemical Engineering, and School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;
    2 Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA;
    3 College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
  • Received:2020-09-14 Revised:2020-10-10 Online:2021-03-28 Published:2021-05-13
  • Contact: Cheng Lian, Shengwei Deng, Jianzhong Wu
  • Supported by:
    This work was sponsored by the National Natural Science Foundation of China (Nos. 91834301, 21908053, and 21808055), Shanghai Sailing Program (19YF1411700).

摘要: Understanding the microscopic structure and thermodynamic properties of electrode/electrolyte interfaces is central to the rational design of electric-double-layer capacitors (EDLCs). Whereas practical applications 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 promising quantitative framework useful for the computational screening of porous electrodes and novel electrolytes.

关键词: Electric double layer, Electrodes/electrolyte interface, Curvature effects, Classical density functional theory, Machine learning

Abstract: Understanding the microscopic structure and thermodynamic properties of electrode/electrolyte interfaces is central to the rational design of electric-double-layer capacitors (EDLCs). Whereas practical applications 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 promising quantitative framework useful for the computational screening of porous electrodes and novel electrolytes.

Key words: Electric double layer, Electrodes/electrolyte interface, Curvature effects, Classical density functional theory, Machine learning