Glass based hydrogen barriers

用于长期H2储存的玻璃容器，如用于移动的电子设备和离网系统的玻璃容器，依赖于具有易加工性和低H2渗透性（< 10-20 mol s-1 Pa-1 m-1@200 C）的化学耐久性玻璃。 这种玻璃的发展仍然是困难的，由于缺乏基本的玻璃结构参数和H2渗透之间的相关性证明了系统的实验研究。在我们的项目的第一阶段，我们可以表明，氢渗透是由两个因素独立：原子堆积密度（离子孔隙率）和拓扑结构的玻璃网络。因此，该项目的应用第二阶段应侧重于通过化学强化（碱交换），控制冷却（假想温度）和Ar压力处理（混合气体效应）的给定玻璃网络拓扑结构的原子堆积密度的变化。虽然有前途的基本见解的氢渗透在玻璃中的结构机制，这种现象还没有得到解决。在第一个项目阶段改进的EGA粉末方法可以测量所需的极低H2渗透率数据。本文的研究结果为高效储氢器件或保护屏障的开发提供了重要的贡献，并将提高对玻璃中相关结构机制的基本理解。

Glass containers for long term H2 storage, as for mobile electronic devices and off-grid systems, rely on chemically durable glasses of easy workability and low H2 permeability (< 10-20 mol s-1 Pa-1 m-1 @ 200C). The development of such glasses is still difficult due the lack of correlations between basic glass structure parameters and H2 permeation proved by systematic experimental investigations. During the first stage of our project, we could show that H2 permeation is governed by two factors independently: the atomic packing density (ionic porosity) and the topology of the glass network. The applied second stage of the project should therefore focus on the variation of atomic packing density of a given glass network topology by means of chemical strengthening (alkaline exchange), controlled cooling (fictive temperature) and Ar pressure treatments (mixed gas effects). Although promising basic insights into the structural mechanism of H2 permeation in glass, such phenomena have not been addressed so far. The EGA powder method refined during the first project stage allows measuring the required very low H2 permeability data. The results intended herewith offer essential contributions to the development of efficient H2 storage devices or protection barriers and will improve the basic understanding of related structural mechanisms in glasses.