Design Principles of Perovskites for Thermochemical Oxygen Separation

被引：92

作者：

Ezbiri, Miriam ^{[1
,2
]}

Allen, Kyle M. ^{[1
]}

Galvez, Maria E. ^{[2
]}

Michalsky, Ronald ^{[2
]}

Steinfeld, Aldo ^{[2
]}

机构：

[1] Paul Scherrer Inst, Solar Technol Lab, CH-5232 Villigen, Switzerland

[2] ETH, Dept Mech & Proc Engn, CH-8092 Zurich, Switzerland

来源：

CHEMSUSCHEM | 2015年 / 8卷 / 11期

基金：

欧洲研究理事会;

关键词：

density functional theory; oxygen evolution; oxygen reduction; perovskites; thermochemical o(2) separation; HYDROGEN-PRODUCTION; AIR SEPARATION; REDOX CYCLE; WATER; CO; CONVERSION; REDUCTION; SELECTION; H-2;

D O I：

10.1002/cssc.201500239

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Separation and concentration of O-2 from gas mixtures is central to several sustainable energy technologies, such as solar-driven synthesis of liquid hydrocarbon fuels from CO2, H2O, and concentrated sunlight. We introduce a rationale for designing metal oxide redox materials for oxygen separation through thermochemical pumping of O-2 against a pO(2) gradient with low-grade process heat. Electronic structure calculations show that the activity of O vacancies in metal oxides pinpoints the ideal oxygen exchange capacity of perovskites. Thermogravimetric analysis and high-temperature X-ray diffraction for SrCoO3-, BaCoO3- and BaMnO3- perovskites and Ag2O and Cu2O references confirm the predicted performance of SrCoO3-, which surpasses the performance of state-of-the-art Cu2O at these conditions with an oxygen exchange capacity of 44mmolO2molSrCoO3-(-1) exchanged at 12.1molO2min(-1)g(-1) at 600-900K. The redox trends are understood due to lattice expansion and electronic charge transfer.

引用

页码：1966 / 1971

页数：6

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