Composite of Ce0.8Gd0.2O2 - δ and GdBaCo2O5+δ as oxygen separation membranes

被引：19

作者：

Choi, M-B ^{[1
]}

Jeon, S-Y ^{[1
]}

Hwang, H-J ^{[2
]}

Park, J-Y ^{[3
]}

Song, S-J ^{[1
]}

机构：

[1] Chonnam Natl Univ, Dept Mat Sci & Engn, Kwangju 500757, South Korea

[2] Inha Univ, Dept Mat Sci & Engn, Inchon 402751, South Korea

[3] Sejong Univ, Dept Adv Mat Engn, Seoul 143747, South Korea

来源：

SOLID STATE IONICS | 2010年 / 181卷 / 37-38期

关键词：

Ionic conductivity; Composite; Oxygen separation membranes; PEROVSKITE-TYPE OXIDES; PERMEATION PROPERTIES; CHEMICAL DIFFUSIVITY; BISMUTH OXIDE; FUEL-CELLS; PERMEABILITY; CONDUCTIVITY; TRANSPORT; METHANE; GAS;

D O I：

10.1016/j.ssi.2010.09.027

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：

A novel oxygen separation membrane using oxygen ions and a mixed oxygen ion-electron conducting CGO-GBCO (Ce0.8Gd0.2O2 (-) (delta)-GdBaCo2O5 + delta,) dual phase composite has been proposed. The transport and surface exchange properties of the CGO-GBCO composite membrane are investigated as a function of oxygen partial pressure (OPP) over the OPP range of 10(-4) <= pO(2)/atm <= 0.21 at 1073 <= T/K <= 1323 using DC conductivity relaxation experiments. The surface exchange coefficient and the oxygen chemical diffusion coefficient of the composite are similar to those of the CGO-based composite membrane under oxidizing conditions. The characteristic thickness of the specimen, calculated from the oxygen chemical diffusion coefficient and surface exchange coefficient, L-c = (D) over tilde /X is 0.25 mm at 1223 K. The thermally activated oxygen permeation flux monotonically increased with increasing oxygen chemical potential gradient, yielding a maximum of 0.28 cc/min . cm(2) at air/He condition for the 0.62 mm-thick CGO-GBCO specimen at 1223 K. This value is an order of magnitude higher than that of GBCO at the same condition. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：1680 / 1684

页数：5

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