Hydrogen diffusion mechanism in ultra-thin Pd alloys by torsional oscillator

对提高储氢效率的技术创新进行了展望。从原子水平上的吸氢观点来看，氢分子解离地吸附在Pd的顶表面。随后，氢原子扩散到块体中。在向块体扩散的过程中，原子氢通过非常近的表面区，其势能与块体的势能有很大的不同。虽然这个非常接近表面的区域非常窄，只有1到2个原子层，但每个氢原子都储存在块体中，或者通过这个区域释放到真空中。因此，研究这一特殊的近表面区的吸放氢机理是提高储氢效率的关键。本研究的重点是氢在极近表面区域的吸附或脱附机理。

The technological innovation for improvement of the hydrogen storage efficiency is expected. In the viewpoint of the hydrogen absorption in the atomic level, the hydrogen molecule dissociatively adsorbs at the Pd top surface. Subsequently, the hydrogen atom diffuses into the bulk. During the diffusing process toward the bulk, the atomic hydrogen goes through the very near surface region, whose potential energy is drastically different than that of the bulk. Though this very near surface region is very narrow as 1 or 2 atom layers, every hydrogen atom stores into the bulk or releases to the vacuum via this region. Therefore, the investigation of the hydrogen adsorption or desorption mechanism at this peculiar very near surface region is a key for improvement of the hydrogen storage efficiency. This study focuses to the hydrogen adsorption or desorption mechanism at the very near surface region.