A Reactive Fe-YSZ Coated Foam Device for Solar Two-Step Water Splitting
A Reactive Fe-YSZ Coated Foam Device for Solar Two-Step Water Splitting
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DOI：
10.1115/1.3090819
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发表时间：
2007
影响因子：
2.3
通讯作者：
T. Kodama;T. Hasegawa;A. Nagasaki;N. Gokon
中科院分区：
文献类型：
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作者：
T. Kodama;T. Hasegawa;A. Nagasaki;N. Gokon
利用铁基氧化物或铁氧体氧化还原系统的热化学两步水分解循环是在阳光带地区将太阳能转化为清洁氢的有前途的过程之一。含铁的YSZ（钇稳定氧化锆）或Fe-YSZ是一种很有前途的两步水分解循环氧化还原材料。Fe2+ YSZ是由YSZ与负载在YSZ上的Fe3 O4在1400℃的惰性气氛中高温反应形成的。Fe2+ -YSZ在1000-1100℃与蒸汽反应生成氢气，形成Fe3+ -YSZ，在1400℃以上的惰性气氛下通过单独的热还原步骤重新激活。在本工作中，研究了涂覆Fe-YSZ颗粒的陶瓷泡沫作为热化学水裂解装置用于太阳能直接照射的接收器/反应器系统。将Fe-YSZ颗粒包覆在mg -部分稳定的氧化锆泡沫盘上，在1100 ~ 1400℃的温度下交替进行两步水分解循环测试。泡沫装置采用太阳模拟器的集中可见光，在N2气流中辐照，峰值通量密度为1000 kW/m2，平均通量密度为470 kW/m2，然后在1100℃下与蒸汽反应，同时在红外炉加热。在重复的循环中，氢气成功地继续产生。ASME版权所有©2007
A thermochemical two-step water splitting cycle using a redox system of iron-based oxides or ferrites is one of the promising processes for converting solar energy into clean hydrogen in sunbelt regions. An iron-containing YSZ (Yttrium-Stabilized Zirconia) or Fe-YSZ is a promising working redox material for the two-step water splitting cycle. The Fe2+ YSZ is formed by a high-temperature reaction between YSZ, and Fe3 O4 supported on the YSZ at 1400°C in an inert atmosphere. The Fe2+ -YSZ reacts with steam and generate hydrogen at 1000–1100°C, to form Fe3+ -YSZ that is re-activated by a thermal reduction in a separate step at temperatures above 1400°C under an inert atmosphere. In the present work, a ceramic foam coated with the Fe-YSZ particles is examined as the thermochemical water splitting device for use in a solardirectly-irradiated receiver/reactor system. The Fe-YSZ particles were coated on an Mg-partially-stabilized zirconia foam disk and the foam device was tested on the two-step water splitting cycle being performed alternately at temperatures between 1100 and 1400°C. The foam device was irradiated by concentrated visible light from a sun-simulator at the peak flux density of 1000 kW/m2 and the average flux density of 470 kW/m2 in a N2 gas stream, and then, was reacted with steam at 1100°C while heating by an infrared furnace. Hydrogen successfully continued to be produced in the repeated cycles.Copyright © 2007 by ASME