First Spectroscopic Identification of Pyrocarbonate for High CO 2 Flux Membranes Containing Highly Interconnected Three Dimensional Ionic Channels

Author(s)

Lingling Zhang, University of South Carolina - ColumbiaFollow
Xinyu Huang, University of South Carolina - ColumbiaFollow
Changyong Qin
Kyle Brinkman
Yunhui Gong
Siwei Wang, University of South CarolinaFollow
Kevin Huang

Document Type

Article

Subject Area(s)

Applied Mechanics, Chemistry, Physics

Abstract

Identification of the existence of pyrocarbonate ion C₂O₅²⁻ in molten carbonates exposed to a CO₂ atmosphere provides key support for a newly established bi-ionic transport model that explains the mechanisms of high CO₂ permeation flux observed in mixed oxide-ion and carbonate-ion conducting (MOCC) membranes containing highly interconnected three dimensional ionic channels. Here we report the first Raman spectroscopic evidence of C₂O₅²⁻ as an active species involved in the CO₂-transport process of MOCC membranes exposed to a CO₂ atmosphere. The two new broad peaks centered at 1317 cm⁻¹ and 1582 cm⁻¹ are identified as the characteristic frequencies of the C₂O₅²⁻ species. The measured characteristic Raman frequencies of C₂O₅²⁻ are in excellent agreement with the DFT-model consisting of six overlapping individual theoretical bands calculated from Li₂C₂O₅ and Na₂C₂O₅.

Publication Info

Published in Physical Chemistry Chemical Physics, Volume 15, Issue 31, 2013, pages 13147-13152.

Rights

© Physical Chemistry Chemical Physics, 2013, Royal Society of Chemistry

Zhang, L., Huang, X., Qin, C., Brinkman, K., Gong, Y., Wang, S., Huang, K. (2013). First Spectroscopic Identification of Pyrocarbonate for High CO 2 Flux Membranes Containing Highly Interconnected Three Dimensional Ionic Channels. Physical Chemistry Chemical Physics, 15(31), 13147-13152.

http://dx.doi.org/10.1039/C3CP52362D