Thermochemical reactivity of 5-15 mol% Fe, Co, Ni, Mn-doped cerium oxides in two-step water-splitting cycle for solar hydrogen production

被引：23

作者：

Gokon, Nobuyuki ^{[1
]}

Suda, Toshinori ^{[2
]}

Kodama, Tatsuya ^{[3
]}

机构：

[1] Niigata Univ, Ctr Transdisciplinary Res, Nishi Ku, Niigata 9502181, Japan

[2] Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan

[3] Niigata Univ, Fac Engn, Dept Chem & Chem Engn, Niigata 9502181, Japan

来源：

THERMOCHIMICA ACTA | 2015年 / 617卷

关键词：

Reactive ceramics; Oxides; Thermochmical cycle; Water-splitting; Hydrogen production; CONVERSION; CERAMICS; SYNGAS; H2O;

D O I：

10.1016/j.tca.2015.08.036

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The thermochemical two-step water-splitting cycle using transition element-doped cerium oxide (M CeO2-delta; M=Fe, Co, Ni, Mn) powders was studied for hydrogen production from water. The oxygen/hydrogen productivity and repeatability of M CeO2-delta materials with M doping contents in the 5-15 mol% range were examined using a thermal reduction (TR) temperature of 1500 degrees C and water decomposition (WD) temperatures in the 800-1150 degrees C range. The temperature, steam partial pressure, and steam flow rate in the WD step had an impact on the hydrogen productivity and production rate. 5 mol% Fe- and Co-doped CeO2-delta enhances hydrogen productivity by up to 25% on average compared to undoped CeO2, and shows stable repeatability of stoichiometric oxygen and hydrogen production for the cyclic thermochemical two-step water-splitting reaction. In addition, 5 mol% Mn-doped CeO2-delta, 10 and 15 mol% Fe- and Mn-doped CeO2-delta show near stoichiometric reactivities. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：179 / 190

页数：12

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