Structure and Dynamics of Hydrogen Inserted in Siliceous Zeolites at High Pressure and Cryogenic Temperatures.

Solid-like nanophases of hydrogen can occur confined in porous materials under much milder pressures and temperatures than those at which bulk solid hydrogen is observed. The goal of this proposal is to study the formation and the metastability of such phases in the pores of zeolites at high pressures and low temperatures by following the pore and unit cell volumes of the zeolites precisely as functions of pressure and temperature by x-ray diffraction. In this way, the metastability of the swelled, H2 filled states at low temperature can be determined, which could have implications for hydrogen storage applications.

相较于块体固态氢的观测形成条件，类固态氢纳米相可在多孔材料的限域环境中，于更为温和的压力与温度参数下生成。本研究提案旨在借助X射线衍射(X-ray diffraction)技术，精准追踪沸石(zeolites)的孔道与晶胞体积随压力与温度的变化关系，以此探究高压低温环境下沸石孔道内此类氢相的形成过程与亚稳态特性。通过该实验方案，可明确低温下充氢溶胀态的亚稳态特性，该研究结果可为氢能存储应用领域提供理论参考价值。