The transfer of electrons across the oxide/water interface has been investigated for oxide particles which are typically found incorporated into structural material surfaces within water circuits of nuclear systems. A pulse radiolysis study was conducted in order to observe the generation and decay kinetics of hydrated electrons in water in the presence of metal oxides. The presence of the oxides was found to have an effect on hydrated electron decay behaviour, with FeO retarding the decay rate and ZrO increasing the decay rate. The presence of CrO appeared to have negligible effect on the decay rate. The electron yield after the irradiation pulse was found to increase for all oxide/water mixtures relative to neat water, indicating electron transfer from the oxide to the water. The responses were attributed to electronic properties such as the band gap of the materials with respect to redox reactions at the material surface, as well as the effect of hydroxyl radicals on electron behaviour in the presence of the oxides.

中文翻译：

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Cr2O3、Fe2O3 和 ZrO2 氧化物/水界面上的电荷转移：脉冲辐射分解研究


已经针对氧化物颗粒研究了电子穿过氧化物/水界面的转移，这些氧化物颗粒通常被发现并入核系统水回路内的结构材料表面中。进行脉冲辐射分解研究是为了观察金属氧化物存在下水中水合电子的产生和衰变动力学。研究发现氧化物的存在对水合电子衰变行为有影响，其中 Fe2O 延迟了衰变速率，ZrO 增加了衰变速率。 CrO 的存在似乎对衰变速率的影响可以忽略不计。发现照射脉冲后，所有氧化物/水混合物的电子产率相对于纯水有所增加，表明电子从氧化物转移到水。这些响应归因于电子特性，例如材料表面氧化还原反应的带隙，以及氧化物存在下羟基自由基对电子行为的影响。