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首页> 外文期刊>Catalysis science & technology >The correlation between surface defects and the behavior of hydrogen adsorption over ZnO under UV light irradiation
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The correlation between surface defects and the behavior of hydrogen adsorption over ZnO under UV light irradiation

机译：之间的关系和表面缺陷行为的氢吸附在紫外线下氧化锌光照射

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摘要

The H-2 adsorption behaviors of a series of ZnO samples with different surface defects were characterized using a novel method of testing photo-assisted gas-sensitive response to H-2 at room temperature under ultraviolet light irradiation. It was found that two types of H-2 adsorption occur according to the electron transfer direction at the interface of the adsorbed H-2 and the ZnO sample (type I: electrons transfer from ZnO to H-2; type II: electrons transfer from H-2 to ZnO). The adsorption type of oxygen vacancies (VOs) and zinc vacancies (VZns) can be changed by adjusting the Fermi level (EF) of ZnO. VOs were beneficial to type I H-2 adsorption due to their higher EF, while VZns were beneficial to type II H-2 adsorption due to their lower EF. The XRD, XPS and EPR results of the samples showed that VOs and VZns are preferentially formed at the {100} and {002} crystalline planes, respectively. Moreover, the in situ DRIFT results of H-2 adsorption and the EPR results of hydroxyl radicals showed that surface hydroxyls and hydroxyl radicals play important roles in H-2 adsorption, and two possible mechanisms of H-2 adsorption were proposed on VOs and VZns over ZnO, respectively. Furthermore, the adsorbed H-2 with different adsorption types induced by VOs and VZns exhibit different oxidation behaviors over ZnO under UV irradiation.
机译：2吸附行为的一系列的氧化锌样品用不同的表面缺陷使用特征检测的新方法2 photo-assisted气敏响应室温在紫外线照射下辐照。根据电子发生吸附界面的转移方向吸附氢气2和氧化锌样品(I型:电子转移从氧化锌到2;电子转移,氢氧化锌)。空缺(VOs)和吸附的氧气锌空缺(却)可以通过调整改变氧化锌的费米能级(EF)。我2吸附型由于其较高的英孚,而却有利于II型2吸附由于其低EF。和VOs EPR样本显示的结果和却优先形成{100}分别和{002}水晶飞机。此外,在原地漂移2的结果吸附和羟基的EPR的结果激进分子表明表面羟基化和羟基自由基在2扮演重要的角色2吸附和两种可能的机制提出了吸附VOs,却结束了分别氧化锌。不同的吸附类型VOs引起的,却表现出不同的氧化行为在紫外光照射下氧化锌。

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