通过吸附到多层二氧化钛纳米管中来实现分子氢的可逆存储。

Reversible storage of molecular hydrogen by sorption into multilayered TiO2 nanotubes.

作者信息

Bavykin Dmitry V, Lapkin Alexei A, Plucinski Pawel K, Friedrich Jens M, Walsh Frank C

机构信息

Catalysis and Reaction Engineering Group, Department of Chemical Engineering, University of Bath, Bath, BA2 7AY, United Kingdom.

出版信息

J Phys Chem B. 2005 Oct 20;109(41):19422-7. doi: 10.1021/jp0536394.

DOI:10.1021/jp0536394

PMID:16853509

Abstract

The sorption of hydrogen between the layers of the multilayered wall of nanotubular TiO2 was studied in the temperature range of -195 to 200 degrees C and at pressures of 0 to 6 bar. Hydrogen can intercalate between layers in the walls of TiO2 nanotubes forming host-guest compounds TiO2 x xH2, where x < or = 1.5 and decreases at higher temperatures. The rate of hydrogen incorporation increases with temperature and the characteristic time for hydrogen sorption in TiO2 nanotubes is several hours at 100 degrees C. The rate of intercalate formation is limited by the diffusion of molecular hydrogen inside the multilayered walls of the TiO2 nanotube. 1H NMR-MAS and XRD data confirm the incorporation of hydrogen between the layers in the walls of TiO2 nanotubes. The nature and possible applications of the observed intercalates are considered.

摘要

在-195至200摄氏度的温度范围内以及0至6巴的压力下，研究了多层纳米管状TiO₂壁层间的氢吸附情况。氢可以插入TiO₂纳米管壁层间形成主客体化合物TiO₂·xH₂，其中x≤1.5且在较高温度下会降低。氢的掺入速率随温度升高而增加，在100摄氏度时，TiO₂纳米管中氢吸附的特征时间为几小时。插层形成速率受TiO₂纳米管多层壁内分子氢扩散的限制。¹H NMR-MAS和XRD数据证实了氢在TiO₂纳米管壁层间的掺入。文中考虑了所观察到的插层的性质及可能的应用。