Adsorption of H2S on graphane decorated with Fe, Co and Cu: a DFT study

Adsorption of H2S on graphane decorated with Fe, Co and Cu: a DFT study
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Fe、Co 和 Cu 修饰的石墨烷上 H2S 的吸附:DFT 研究

DOI:
10.1039/c7ra04905f
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发表时间:
2017-06
期刊:
影响因子:
3.9
通讯作者:
Wang Chaoyang
Wang Chaoyang
中科院分区:
化学3区
文献类型:
--
作者:
Zhou Qingxiao;Su Xiangying;Ju Weiwei;Yong Yongliang;Li Xiaohong;Fu Zhibing;Wang Chaoyang

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本文用密度泛函理论(DFT)方法研究了硫化氢分子在氢化石墨烯(石墨烯)表面的吸附。在我们的结果中,我们发现H空位的出现显著地提高了石墨烷的反应活性,这是由于空位上的未配对电子所致。但是,较小的吸附能和较低的电荷转移表明,硫化氢分子与纯H-空位缺陷石墨烷之间的相互作用是通过物理吸附进行的。通过引入过渡金属掺杂(Fe、Co、Cu),H_2S分子的吸附过程转变为化学吸附。此外,H_2S的吸附引起了禁带宽度的减小,这可以作为检测H_2S气体的信号。
Herein, density functional theory (DFT) calculations were performed to investigate the adsorption of a H2S molecule on the surface of hydrogenated graphene (graphane). In our results, we found that the appearance of an H-vacancy significantly improved the reactivity of graphane due to the unpaired electrons of the vacancy site. However, small adsorption energy and low charge transfer indicated that the interaction between the H2S molecule and the pure H-vacancy-defected graphane occurred via physisorption. By introducing transition-metal dopants (Fe, Co, and Cu), the adsorption process of the H2S molecule changed to chemisorption. Furthermore, the adsorption of H2S induced a decrease in the band gaps, which could be seen as signal for the detection of H2S gas.
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