A novel dual phase membrane 40 wt% Nd0.6Sr0.4CoO3-delta-60 wt% Ce0.9Nd0.1O2-delta: design, synthesis and properties

authored by

Yuan He, Lei Shi, Fan Wu, Weiwei Xie, Shu Wang, Dong Yan, Peijiang Liu, Man-Rong Li, Jürgen Caro, Huixia Luo

Abstract

Oxygen permeation, stability and chemical bonding characteristics of 40 wt% Nd

_0.6Sr

_0.4CoO

_3-δ-60 wt% Ce

_0.9Nd

_0.1O

_2-δ (40NSCO-60CNO) dual-phase composite membrane reactors were investigated. The 40NSCO-60CNO oxygen permeable membrane was prepared via an in situ one-pot one-step EDTA-citric acid method. The crystal structure of the 40NSCO-60CNO dual phase material was characterized by X-ray diffraction (XRD) and in situ XRD. The microstructure was investigated using transmission electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM) combined with energy-dispersive X-ray spectroscopy (EDXS) and electron energy-loss spectroscopy (EELS). The results show that the 40NSCO-60CNO composite represents a micro-scale mixture of only the two pure phases NSCO and CNO. The oxygen permeation fluxes through the 40NSCO-60CNO dual phase membrane were measured at elevated temperatures (900-1000 °C) with one side of it exposed to synthetic air and the other side to a flowing He gas stream. A stable oxygen permeation rate of 0.90 mL cm

^-2 min

^-1 was obtained with a 0.4 mm thick membrane under an air/He oxygen partial pressure gradient at 1000 °C. The 40NSCO-60CNO dual phase membrane with a thickness of 0.6 mm showed a stable oxygen flux of 0.55 mL cm

^-2 min

^-1 at 950 °C for 100 h under pure CO

₂ sweeping.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry

External Organisation(s)

Sun Yat-Sen University
Harvard University
Louisiana State University

Type

Article

Journal

Journal of Materials Chemistry A

Volume

6

Pages

84-92

No. of pages

9

ISSN

2050-7488

Publication date

07.01.2018

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Chemistry, General Materials Science, Renewable Energy, Sustainability and the Environment

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1039/c7ta07842k (Access: Closed)