Oxidation states at alkali-metal-doped Ni(110)-O surfaces
Oxidation states at alkali-metal-doped Ni(110)-O surfaces
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DOI：
10.1039/b006718k
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发表时间：
2001-01-01
影响因子：
3.3
通讯作者：
Roberts, MW
中科院分区：
文献类型：
--
作者：
Carley, AF;Jackson, SD;Roberts, MW
用X射线光电子能谱（XPS）研究了锂、钠和钾与Ni（110）单晶氧化表面的相互作用。在室温下将碱金属并入氧化物层中导致化学计量NiO的固有Ni（2p）卫星结构的抑制，根据最近的理论模型证实其起源于站点间筛选过程。此外，碱金属与NiO在较高温度下反应会产生二价或三价镍酸盐物质。还研究了水蒸气对镍酸盐形成和镍酸盐对一氧化碳的反应性的影响。
The interaction of lithium, sodium and potassium with an oxidised Ni(110) single crystal surface has been investigated using X-ray photoelectron spectroscopy (XPS). Incorporation of the alkali metal into the oxide layer at room temperature results in the suppression of the intrinsic Ni(2p) satellite structure of stoichiometric NiO, confirming its origin in an inter-site screening process in accordance with a recent theoretical model. In addition, the reaction of the alkali metal with NiO at higher temperatures gives rise to a divalent or trivalent nickelate species. The effect of water vapour on nickelate formation and the reactivity of the nickelate to carbon monoxide is also investigated.