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

页码：51 / 57

页数：7

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