Solar hydrogen generation with H2O/ZnO/MnFe2O4 system

被引：48

作者：

Inoue, M ^{[1
]}

Hasegawa, N ^{[1
]}

Uehara, R ^{[1
]}

Gokon, N ^{[1
]}

Kaneko, H ^{[1
]}

Tamaura, Y ^{[1
]}

机构：

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

来源：

SOLAR ENERGY | 2004年 / 76卷 / 1-3期

关键词：

solar hydrogen; hydrogen generation; water splitting; zinc oxide; Mn-ferrite;

D O I：

10.1016/j.solener.2003.08.033

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The hydrogen generation reaction in the H2O/ZnO/MnFe2O4 system was studied to clarify the possibility of whether this reaction system can be used for the two-step water splitting to convert concentrated solar heat to chemical energy of H-2. At 1273 K, the mixture of ZnO and MnFe2O4 reacted with water to generate H-2 gas in 60% yield. X-ray diffractometry and chemical analysis showed that 48 mol% of Mn-II (divalent manganese ion) in the A-site of MnFe2O4 was substituted with Zn-II (divalent zinc ion) and that chemical formula of the solid product was estimated to be (Zn0.58Mn0.42Mn0.39Fe1.61O4)-Mn-II-Fe-III (Mn-III : trivalent manganese ion). Its lattice constant was smaller than that of the MnFe2O4 (one of the two starting materials). From the chemical composition, the reaction mechanism of the H-2 generation with this system was discussed. Since the Mn ions in the product solid after the H-2 generation reaction are oxidized to Mn3+, which can readily release the O2- ions as O-2 gas around 1300 K, the two-step of H-2 generation and O-2 releasing seem to be cyclic. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：309 / 315

页数：7

共 27 条

[1] CHARACTERIZATION OF CARBON DEPOSITED FROM CARBON-DIOXIDE ON OXYGEN-DEFICIENT MAGNETITES [J].