Abstract
A series of modified iron oxides, which can store and supply pure hydrogen for polymer electrolyte fuel cells through repeated redox reactions (Fe3O4 + 4H2 ↔ 3Fe + 4H2O), were prepared by impregnating Fe or Fe2O3 powder with an aqueous solution containing foreign metal additives. Effects of various metal additives in the modified samples on the hydrogen production from water decomposition were investigated. Among all the metal cation additives examined, Mo was the most favorable one for enhancing the reoxidation performance of the reduced modified samples at lower temperatures. The addition of Mo to Fe or Fe2O3 powder not only decreased the temperature of water decomposition significantly (i.e., increased the production of hydrogen at lower temperatures) but improved the stability of the modified samples during repeated redox cycling. The temperature of H2 production decreased from 489 to 289 °C for Mo-modified Fe and from 527 to 283 °C for Mo-modified Fe2O3 in the fourth cycle. No obvious decrease in the...
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