Oxygen-releasing step of ZnFe2O4/(ZnO + Fe3O4)-system in air using concentrated solar energy for solar hydrogen production
Oxygen-releasing step of ZnFe2O4/(ZnO + Fe3O4)-system in air using concentrated solar energy for solar hydrogen production
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DOI：
10.1016/j.solener.2004.10.012
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发表时间：
2005-05
期刊：
影响因子：
6.7
通讯作者：
Y. Tamaura;H. Kaneko
中科院分区：
文献类型：
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作者：
Y. Tamaura;H. Kaneko
利用太阳模拟器上的聚集型氙灯光束，在气流条件下，研究了利用聚光太阳能两步分水制氢的ZnFe2O4/(ZnO+Fe3O4)-太阳能制氢体系的放氧步骤。尖晶石型化合物锌铁氧体在1800K的气流条件下释放出O2气体，然后分解为Fe3O4(=Fe2Fe2IO4)和氧化锌，产率接近100%(ZnFe2O4=ZnO+2/3Fe3O4+1/6O2)。在反应细胞壁表面沉积了一层较薄的氧化锌。热力学研究表明，氧化锌是由空气中的氧气与锌铁氧化物生成的金属锌蒸气反应生成的。结合本研究的释氧步骤和前人研究的产氢步骤(ZnO+2/3Fe3O4+1/3H2O=ZnFe2O4+1/3H2)，证明了在1800K的空气中进行的释氧步骤和在1100K的产氢步骤中，由一个循环的ZnFe2O4/(ZnO+Fe3O4)-体系证明了太阳的产氢过程。
The oxygen-releasing step of the ZnFe2O4/(ZnO+Fe3O4)-system for solar hydrogen production with two-step water splitting using concentrated solar energy was studied under the air-flow condition by irradiation with concentrated Xe lamp beams from a solar simulator. The spinel-type compound of ZnFe2O4(Zn-ferrite) releases O2gas under the air-flow condition at 1800K and then decomposes into Fe3O4(=FeIIFe2IIIO4) and ZnO with a nearly 100% yield (ZnFe2O4=ZnO+2/3Fe3O4+1/6O2). The ZnO was deposited as the thin layer on the surface of the reaction cell wall. A thermodynamic study showed that the ZnO was produced by the reaction between the O2gas in the air and the metal Zn vapor generated from ZnFe2O4. With the combined process of the present study on the O2-releasing step and the previous one on the H2generation step (ZnO+2/3Fe3O4+1/3H2O=ZnFe2O4+1/3H2) for the ZnFe2O4/(ZnO+Fe3O4)-system, solar H2production was demonstrated by one cycle of the ZnFe2O4/(ZnO+Fe3O4)-system, where the O2-releasing step had been carried out in air at 1800K and the H2generation step at 1100K.