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FeNbO4-based oxide cathode for steam electrolysis
Solid State Ionics ( IF 3.2 ) Pub Date : 2019-12-06 , DOI: 10.1016/j.ssi.2019.115181
Xiaojing Liu , Jun Zhou , Deti Xie , Jiupai Ni , Chengsheng Ni

FeNbO4 is a layered oxide containing Fe3+ and Nb5+ cations on either side of a hexagonal close-packed O2 plane. This layered oxide can be reduced at 800 °C under hydrogen to form a composite of Fe0 and a FeNb2O6 tri-rutile of similar structure. The isothermal conductivity of FeNbO4 against oxygen partial pressure, PO2, indicates that the critical phase-switching oxygen pressure is around 1016 bar at 800 °C and the conductivity of the resultant composite shows a p-type conductivity under a PO2 between 1020 and 1017 bar. The composite of FeNb2O6 and Fe0 from FeNbO4 reduced in 5% H2/Ar gas can maintain a stable performance as the cathode for the electrolysis of steam. In addition, we demonstrate that FeNbO4 can be transformed to FeNb2O6 and Fe/Fe(O) under a cathodic current without prior H2 reduction and a high current density of 0.32 A cm2 can be obtained at 1.5 V for the electrolysis of 5% H2O/Ar. Nb5+ in FeNb2O6 can be reduced to Nb4+ under a bias of 1.5 V at 800 °C.



中文翻译:

蒸汽电解用FeNbO 4基氧化物阴极

FeNbO 4是一种层状氧化物,在六方密堆积O 2 平面的两侧均包含Fe 3+和Nb 5+阳离子。该层状氧化物可以在氢气中在800°C下还原,以形成结构相似的Fe 0和FeNb 2 O 6三金红石的复合物。粉白的等温电导率4对氧气分压,P O 2,表明该临界相位切换氧气压力为大约10 - 16 在800℃巴和所得复合材料显示导电性的p型导电下为P O2介于10 20和10 17  bar之间。在5%H 2 / Ar气体中还原的FeNbO 4中的FeNb 2 O 6和Fe 0的复合物可以保持稳定的性能,作为蒸汽电解的阴极。此外,我们证明了FeNbO 4可以在阴极电流下转化为FeNb 2 O 6和Fe / Fe(O),而无需事先将H 2还原,并且在1.5 V下可获得0.32 A cm - 2的高电流密度。电解5%H 2 O / Ar。FeNb 2中的Nb 5+在800°C下,在1.5 V的偏压下,O 6可以还原为Nb 4+

更新日期:2019-12-06
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