Cerium ion redox system in CeO2-xFe2O3 solid solution at high temperatures (1,273-1,673 K) in the two-step water-splitting reaction for solar H2 generation

被引：80

作者：

Kaneko, H. ^{[1
]}

Ishihara, H. ^{[1
]}

Taku, S. ^{[1
]}

Naganuma, Y. ^{[1
]}

Hasegawa, N. ^{[1
]}

Tamaura, Y. ^{[1
]}

机构：

[1] Tokyo Inst Technol, Res Ctr Carbon Recyling & Energy, Meguro Ku, Tokyo 1528552, Japan

来源：

JOURNAL OF MATERIALS SCIENCE | 2008年 / 43卷 / 09期

关键词：

D O I：

10.1007/s10853-008-2499-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

CeO2-xFe(2)O(3) (x = 0.026-0.214) solid solutions with different Ce:Fe mole ratios (Ce:Fe = 9.5:0.5-7.0:3.0) were prepared as reactive ceramics with the combustion method for solar hydrogen production. The prepared CeO2-xFe(2)O(3) solid solutions were characterized by X-ray diffractometry, ICP atomic emission spectrometry, and Mossbauer spectroscopy. Two-step water-splitting reaction with the CeO2-xFe(2)O(3) solid solution proceeded at 1,673 K for the O-2-releasing reaction and at 1,273 K for the H-2-generation reaction by irradiation of an infrared imaging lamp as a solar simulator. The amounts of H-2 gas evolved in the H-2-generation reaction with CeO2-xFe(2)O(3) solid solutions were 0.97-1.8 cm(3)/g, the evolved H-2/O-2 ratio was approximately equal to 2 of the stoichiometric value. The amounts of H-2 and O-2 gases were independent of the Ce:Fe mole ratio in the CeO2-xFe(2)O(3) solid solution. It was suggested that the O-2-releasing and H-2-generation reactions with the CeO2-xFe(2)O(3) solid solution were repeated with the reduction and oxidation of Ce4+-Ce3+ enhanced by the presence of Fe3+-Fe2+.

引用

页码：3153 / 3161

页数：9

共 22 条

[11] Synthesis of nanoscale Ce1-xFexO2 solid solutions via a low-temperature approach [J].