Composition and hydrogen storage structure of Ti2CTx MXene with ultrahigh hydrogen storage capacity

TL;DR

This paper investigates the composition and hydrogen storage structure of Ti2CTx MXene, revealing its ultra-high capacity of 8.8 wt.% at room temperature and the layered H2 storage mechanism within its structure.

Contribution

It provides detailed characterization of Ti2CTx MXene's composition and elucidates the hydrogen storage structure responsible for its high capacity.

Findings

Ti2CTx MXene achieves 8.8 wt.% hydrogen storage at room temperature.

Hydrogen is stored in three layers within the interlayer space.

H2 layers form a graphene-like 2D structure in solid/liquid state.

Abstract

Recently, Liu et al. reported that Ti2CTx MXene have ultra-high hydrogen storage capacity (8.8 wt.%) at room temperature. For the purpose to clearly understand the hydrogen storage (H-storage), the composition of studied samples should be clearly characterized and the H-storage structure need be explored. To achieve 8.8 wt.% capacity, 3 layers of H2 molecules need be stored in the interlayer space of MXene with the structure of Ti2CF2H14. The H2 layers with graphene-like 2D structure are in solid/liquid state at room temperature, which is significant in the explore new materials with surprising properties.