Alexandru-Cristi Iancu, George A. Lungu, Cristian A. Tache and Cristian M. Teodorescu
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引用次数: 0
摘要
高分辨率和超快光电子能谱实时揭示了二氧化碳(CO2)在铁电(001)取向、BaO 端接的钛酸钡中的可逆吸附和解吸,低能电子衍射也证明了这一点。当基底被加热到居里温度以上时,就会发生解吸。据推算,一个表面 BaO 单胞吸附的二氧化碳量为一个分子(吸附温度低于室温),而两个单胞吸附的二氧化碳量为一个分子(吸附温度高于室温)。分子中的碳与表面的氧结合,形成 CO3 结构。BaTiO3(001) 表面不受反复吸附-解吸循环的影响。相对较高的二氧化碳吸附量以及基底在反复吸附和解吸过程后的稳定性,促使钛酸钡成为脱碳技术的理想候选材料。
Ferroelectric-enabled significant carbon dioxide molecular adsorption on BaTiO3(001)†
Carbon dioxide (CO2) is reversibly adsorbed and desorbed from ferroelectric (001) oriented, BaO-terminated barium titanate, as revealed in real time by high resolution and ultrafast photoelectron spectroscopy and certified by low energy electron diffraction. Desorption proceeds when the substrate is heated above its Curie temperature. The amount of CO2 adsorbed is derived to be between one molecule for a surface BaO unit cell (adsorption below room temperature) and one molecule for two unit cells (adsorption above room temperature). The molecule is bound with its carbon to surface oxygen, forming a CO3 structure. The BaTiO3(001) surface is unaffected by repeated cycles of adsorption–desorption. The relatively high amount of CO2 adsorbed and the stability of the substrate after repeated adsorption and desorption processes promotes barium titanate as a promising candidate for decarbonization technologies.