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arXiv · 2312.05512

Computational workflow for investigating hydrogen permeation in novel hydrogen storage materials

Sourabh Singha·Abhijit Chatterjee
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Abstract

The United States Department of Energy (DOE) has set ambitious targets for hydrogen storage materials for onboard light-duty cars which are to be achieved by 2027. One of the major problems in solid hydrogen storage materials is the sluggish uptake/release kinetics. Much attention has been focused on understanding kinetics. Hydrogen solid-state diffusion is a rate-controlling step in the majority of metal hydrides. Here we dis-cuss computational workflow which can be used to estimate hydrogen diffusivity. A de-tailed study of hydrogen concentration, hydrogen neighbors is performed on nickel hy-dride (NiH) fcc materials to understand their effect on H diffusion. The nudged elastic band (NEB) method is used to determine hydrogen diffusion barrier with various hydro-gen concentrations in presence of hydrogen neighbors. The energy barriers for hydrogen hopping were calculated for few million different configurations with various local chemical environments. Two paths for H hopping from one octahedral site to a vacant neighbor octahedral site are identified: one path is straight, and the other is curved via tetrahedral site. The curved path shows diffusion faster than the straight path. This study demonstrates H diffusion is faster at higher hydrogen concentration, as the concomitant volume expansion lowers the energy barrier.

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Sourabh Singha, Abhijit Chatterjee. 2023-12-09. Computational workflow for investigating hydrogen permeation in novel hydrogen storage materials. https://arxiv.org/abs/2312.05512

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