Impact of the Channel Length in Nanoporous Electric Double-Layer Capacitors on the Charge Transport Explored by Metal-Organic Framework Films

被引:0
作者
Liu, Yidong [1 ]
Chandresh, Abhinav [2 ]
Heinke, Lars [1 ,2 ]
机构
[1] Karlsruhe Inst Technol KIT, Inst Funct Interfaces IFG, D-76344 Eggenstein Leopoldshafen, Germany
[2] Free Univ Berlin, Inst Chem & Biochem, Phys Chem, D-14195 Berlin, Germany
来源
ACS PHYSICAL CHEMISTRY AU | 2025年
基金
欧盟地平线“2020”;
关键词
metal-organic frameworks; supercapacitors; ionic liquid; cyclic voltammetry; charge transportkinetics; ELECTROCHEMICAL ENERGY-STORAGE; CARBON SPHERES; PERFORMANCE; SUPERCAPACITORS; SIZE;
D O I
10.1021/acsphyschemau.4c00104
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
For enhancing the performance of electric double-layer capacitors, the porous electrodes must be further optimized. While many studies on electrolyte and electrode structures enable detailed insights, the length of the pore channels of the electrode has been overlooked. Here, we use films of two-dimensional conductive metal-organic frameworks, where the film thickness (and thus the pore channel length) is rationally tuned over a wide range. Cyclic voltammetry experiments with two different electrolytes were conducted, revealing the charge transport kinetics in the porous electrodes. For the highly mobile electrolyte, the kinetics is not limited by ion transport (i.e., diffusion) even for thick films, exhibiting mainly surface-controlled kinetic behavior. In contrast, for the less mobile electrolyte, the kinetics is primarily limited by ion diffusion, and the pore channel length has a severe impact, where long channels result in strongly decreased capacitances, highlighting the importance of adjusting the channel length.
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页数:8
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