摘要
采用密度泛函理论方法,运用平板模型对噻吩分子在Ni(111)表面的水平吸附进行了结构优化和能量计算.结果表明,hcpA位的吸附最稳定,以bridgeB吸附最不稳定;噻吩吸附在表面上时,S原子向上翘起,4个C原子与边面Ni原子的作用更紧密,表面原子与噻吩的匹配程度决定了吸附的强度和吸附后S—C键的活泼性;噻吩以bridgeA吸附时分子与表面之间的电子给予与反馈最多,分子最活泼,而hcpA位吸附后噻吩分子轨道上电子的能量变稳定,分子并不活泼.
The adsorption of thiophene on the(111)surface of nickel has been optimized and studied using slab mode based on the density functional theory calculations.The results show that the hcpA is the most stable adsorption mode,while the bridgeA adsorption is not stable.S atom of adsorbed thiophene is twisted to vacuum.The strong interaction between the molecule and surface is formed by C atoms,and the activity of C—S bond is correlated with the matching degree between surface and thiophene molecule.The back-donation effect from surface to thiophene molecule is strong in bridgeA adsorption,leading to a strong activity.While the adsorption mode of hcpA presents a stable state of electrons in the molecular orbital.
出处
《分子科学学报》
CAS
CSCD
北大核心
2014年第4期318-323,共6页
Journal of Molecular Science
基金
辽宁省高等学校优秀人才支持计划资助项目(LJQ2011034)
关键词
噻吩
吸附
脱硫
密度泛函理论
thiophene
adsorption
desulfurization
DFT