In-pore exchange and diffusion of carbonate solvent mixtures in nanoporous carbon

被引：11
作者：
Alam, Todd M. [1 ]
Popp, Thomas M. Osborn [1 ,2 ]
机构：
[1] Sandia Natl Labs, Dept Organ Mat Sci, POB 5800, Albuquerque, NM 87185 USA
[2] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
来源：
CHEMICAL PHYSICS LETTERS | 2016年 / 658卷
基金：
美国能源部;
关键词：
H-1; NMR; Diffusion; PFG; HR-MAS; Porous carbon; Supercapacitor; ENERGY-STORAGE TECHNOLOGIES; NUCLEAR-MAGNETIC-RESONANCE; LITHIUM-ION CAPACITORS; ACTIVATED CARBON; NMR; ELECTROLYTE;
D O I：
10.1016/j.cplett.2016.06.014
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：
High resolution magic angle spinning (HRMAS) H-1 NMR spectroscopy has been used to resolve different surface and in-pore solvent environments of ethylene carbonate (EC) and dimethyl carbonate (DMC) mixtures absorbed within nanoporous carbon (NPC). Two dimensional (2D) H-1 HRMAS NMR exchange measurements revealed that the inhomogeneous broadened in-pore resonances have pore-to-pore exchange rates on the millisecond timescale. Pulsed-field gradient (PFG) NMR diffusometry revealed the in-pore self-diffusion constants for both EC and DMC were reduced by up to a factor of five with respect to the diffusion in the non-absorbed solvent mixtures. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：51 / 57
页数：7
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